DEL VALLE WATER TREATMENT PLANT OZONATION PROJECTWater Agency” or “Zone 7”), acting as the...

DEL VALLE WATER TREATMENT PLANT OZONATION PROJECT

Initial Study / Mitigated Negative Declaration

Prepared for Zone 7 Water Agency

FINAL

October 2017

[PENDING BOARD APPROVAL]

FINAL

DEL VALLE WATER TREATMENT PLANT OZONATION PROJECT

Initial Study / Mitigated Negative Declaration

Prepared for Zone 7 Water Agency

550 Kearny Street Suite 800 San Francisco, CA 94108 415.896.5900 www.esassoc.com

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October 2017

[PENDING BOARD APPROVAL]

OUR COMMITMENT TO SUSTAINABILITY | ESA helps a variety of public and private sector clients plan and prepare for climate change and emerging regulations that limit GHG emissions. ESA is a registered assessor with the California Climate Action Registry, a Climate Leader, and founding reporter for the Climate Registry. ESA is also a corporate member of the U.S. Green Building Council and the Business Council on Climate Change (BC3). Internally, ESA has adopted a Sustainability Vision and Policy Statement and a plan to reduce waste and energy within our operations. This document was produced using recycled paper.

Del Valle Water Treatment Plant Ozonation Project i ESA / 160463.06 Initial Study / Mitigated Negative Declaration October 2017

TABLE OF CONTENTS Del Valle Water Treatment Plant Ozonation Project – Initial Study / Mitigated Negative Declaration

Page

Chapter 1, Introduction ...................................................................................................... 1-1 1.1 Organization of the Document ........................................................................... 1-1 1.2 Purpose of the Mitigated Negative Declaration .................................................. 1-1 1.3 Decision to Prepare a Mitigated Negative Declaration for this Project ............... 1-2 1.4 Public Review Process ...................................................................................... 1-2 1.5 Agencies’ Use of this Document ........................................................................ 1-3

Chapter 2, Project Description .......................................................................................... 2-1 2.1 Introduction ........................................................................................................ 2-1 2.2 Project Goals and Objectives ............................................................................ 2-3 2.3 Project Location and Setting .............................................................................. 2-3 2.4 Proposed Project ............................................................................................... 2-4 2.5 Project Construction .......................................................................................... 2-8 2.6 Project Operations and Maintenance ............................................................... 2-10

Chapter 3, Initial Study Environmental Checklist ............................................................ 3-1 3.1 Environmental Factors Potentially Affected ....................................................... 3-3 3.2 Environmental Checklist .................................................................................... 3-4

3.2.1 Aesthetics .............................................................................................. 3-4 3.2.2 Agricultural and Forest Resources ........................................................ 3-8 3.2.3 Air Quality ............................................................................................ 3-10 3.2.4 Biological Resources ........................................................................... 3-17 3.2.5 Cultural Resources .............................................................................. 3-22 3.2.6 Geology, Soils, and Seismicity ............................................................ 3-26 3.2.7 Greenhouse Gas Emissions ................................................................ 3-30 3.2.8 Hazards and Hazardous Materials ...................................................... 3-33 3.2.9 Hydrology and Water Quality ............................................................... 3-38 3.2.10 Land Use and Land Use Planning ....................................................... 3-43 3.2.11 Mineral Resources............................................................................... 3-45 3.2.12 Noise ................................................................................................... 3-46 3.2.13 Population and Housing ...................................................................... 3-50 3.2.14 Public Services .................................................................................... 3-51 3.2.15 Recreation ........................................................................................... 3-52 3.2.16 Transportation and Traffic ................................................................... 3-53 3.2.17 Tribal Cultural Resources .................................................................... 3-56 3.2.18 Utilities and Service Systems .............................................................. 3-59 3.2.19 Mandatory Findings of Significance ..................................................... 3-62

Chapter 4, Report Preparers ............................................................................................. 4-1Chapter 5, Mitigation Monitoring and Reporting Program ............................................ 5-1

Table of Contents

Page

Del Valle Water Treatment Plant Ozonation Project ii ESA / 160463.06 Initial Study / Mitigated Negative Declaration October 2017

Appendices A. Air Quality Calculations ..................................................................................................A-1 B. Listed and Special-Status Species Considered .............................................................B-1

List of Figures 2.1 Del Valle WTP Site Location ....................................................................................... 2-2 2.2 Site Layout .................................................................................................................. 2-5 2.3 DVWTP Site Views – Project Site ............................................................................... 2-6 3.1 DVWTP Site Views – Aesthetics ................................................................................. 3-6 3.2 DVWTP Site Views – Biological Resources .............................................................. 3-18

List of Tables 1.1 Required Permits and Approvals ................................................................................ 1-4 3.1 Average Daily Construction-related Pollutant Emissions .......................................... 3-13 3.2 Maximum Daily Emergency Generator Testing Pollutant Emissions ........................ 3-13 3.3 Noise Levels from Typical Construction Equipment .................................................. 3-48

Del Valle Water Treatment Plant Ozonation Project 1-1 ESA / 160463.06 Initial Study / Mitigated Negative Declaration July 2017

CHAPTER 1 Introduction

1.1 Organization of the Document This document is organized to assist the reader in understanding the potential impacts that the proposed project may have on the environment and to fulfill the requirements of the California Environmental Quality Act (CEQA).

Chapter 1, Introduction, describes this document’s purpose under CEQA, describes the public participation process, and summarizes the applicable regulatory requirements.

Chapter 2, Project Description, provides an introduction to the Project with Project background, needs and objectives, and discusses the proposed facilities.

Chapter 3, Environmental Checklist, presents the CEQA Initial Study Environmental Checklist, analyzes environmental impacts resulting from the Project and describes mitigation measures that would avoid or reduce potential significant impacts to less-than-significant levels.

Chapter 4, List of Preparers, presents the individuals who have contributed to this Initial Study/Mitigated Negative Declaration.

1.2 Purpose of the Mitigated Negative Declaration The Alameda County Flood Control and Water Conservation District, Zone 7 (hereafter “Zone 7 Water Agency” or “Zone 7”), acting as the Lead Agency under CEQA, is proposing to design and construct the Del Valle Water Treatment Plant Ozonation Project on a Zone 7 Water Agency-owned parcel at the Del Valle Water Treatment Plant (DVWTP) facility.

The purpose of the following Initial Study (IS) was to provide a basis for deciding whether to prepare an Environmental Impact Report, a Mitigated Negative Declaration (MND), or a Negative Declaration. Based on its findings, Zone 7 determined that a MND would satisfy the requirements of CEQA (Public Resources Code, §21000 et seq.) and the State CEQA Guidelines (California Code of Regulations, Title 14, §15000 et seq.), as noted below.

CEQA encourages Lead Agencies and applicants to modify their projects to avoid significant adverse impacts to the environment.

1. Introduction


Section 15063(d) of the CEQA Guidelines states the content requirements of an IS as follows:

15063(d) Contents. An Initial Study shall contain in brief form:

(1) A description of the project including the location of the project;

(2) An identification of the environmental setting;

(3) An identification of environmental effects by use of a checklist, matrix, or other method, provided that entries on a checklist or other form are briefly explained to indicate that there is some evidence to support the entries;

(4) A discussion of the ways to mitigate the significant effects identified, if any;

(5) An examination of whether the project would be consistent with existing zoning, plans, and other applicable land use controls;

(6) The name of the person or persons who prepared or participated in the Initial Study.

1.3 Decision to Prepare a Mitigated Negative Declaration for this Project

As noted above, this Project is subject to the requirements of CEQA and Zone 7 is the CEQA Lead Agency for this Project. Prior to making a decision to approve this Project, the District must identify and document the potential significant environmental effects of the Project in accordance with CEQA. This IS/MND has been prepared under the direction of Zone 7 to fulfill these requirements.

The IS analysis indicates that some impacts would be potentially significant but that project changes and proposed mitigation measures would result in those impacts being reduced to less-than-significant levels. In accordance with CEQA Guidelines Section 15070, a MND is the appropriate document for this Project because the IS identifies potentially significant effects; however:

a. Revisions to the project plan were made that would avoid, or reduce, the effects to a point where clearly no significant effects would occur, and;

b. There is no substantial evidence that the project, as revised, may have a significant effect on the environment.

1.4 Public Review Process The Draft IS/MND was circulated to local and state agencies, interested organizations, and individuals who might have had interest in, and wished to review and provide comments on, the project description, the proposed mitigation measures, or other aspects of the report. The 30-day public review period per CEQA Guidelines Section 15105(b) will take place from July 10, 2017, through August 8, 2017.

1. Introduction


The Draft IS/MND and supporting documentation were posted on the Zone 7 website during that period. Printed copies of the Draft IS/MND and supporting documents were also available for review at:

1. Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551

2. City of Livermore 1052 South Livermore Avenue Livermore, CA 94550

3. Livermore Civic Center Public Library 1188 South Livermore Avenue Livermore, CA 94550

4. Dublin Public Library 200 Civic Plaza Dublin, CA 94568

5. Pleasanton Public Library 400 Old Bernal Avenue Pleasanton, CA 94566

6. Zone 7 Website: http://www.zone7water.com/publications-reports/environmental-review-documents

7. Via written request for a paper copy or CD from the District

Written comments or questions regarding the Draft IS/MND were requested by Zone 7 and directed to the attention of Tami Church at the address provided below.

Tami Church Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551 Phone: (925) 454-5036 e-mail: [email protected]

1.5 Agencies’ Use of this Document CEQA Responsible Agencies are state and local agencies that have some responsibility or authority for carrying out or approving a project. In many instances, these public agencies must make a discretionary decision to issue a local permit, provide right-of-way or encroachment, or provide funding or other resources that are critical to the execution of a project. Trustee agencies are state agencies that have the authority by law for the protection of natural resources held in trust for the public.

This IS/MND is intended to assist State and local agencies to carry out their responsibilities for permit review or approval authority over various aspects of a project. This Project would likely require specific permitting and/or review by the agencies listed in Table 1.1.

http://www.zone7water.com/publications-reports/environmental-review-documents



1. Introduction


TABLE 1.1 REQUIRED PERMITS AND APPROVALS

Potential Permit or Approval Agency

• Amended Hazardous Materials Business Plan Alameda County

• General Permit for Stormwater Discharges Associated with Construction and Land Disturbance Activities (Order No., as amended by Order No. 2009-0009 DWQ) under the National Pollutant Discharge Elimination System (NPDES)

• Stormwater Pollution Prevention Plan (SWPPP)

• Post-Construction Stormwater Management Requirements for Development Projects

San Francisco Bay Regional Water Quality Control Board (Region 2)

• Permit to Construct

• Authority to Operate

Bay Area Air Quality Management District


CHAPTER 2 Project Description

2.1 Introduction The Alameda County Flood Control and Water Conservation District, Zone 7 (hereafter “Zone 7 Water Agency” or “Zone 7”) is one of 10 active zones in the county. Zone 7 is a water wholesaler, in addition to providing flood protection services. The Zone 7 service area encompasses the cities of Livermore, Pleasanton, Dublin, and parts of Dougherty Valley (unincorporated Alameda County). Zone 7 regularly undertakes projects involving improvement and maintenance of existing facilities, as well as construction of new facilities, and acts as Lead Agency on projects subject to the California Environmental Quality Act (CEQA).

Zone 7 is primarily a water wholesaler and supplies treated water to four retail water supply agencies:

• City of Livermore • City of Pleasanton • Dublin-San Ramon Services District • California Water Service Company – Livermore District

These retail customers deliver water for municipal and industrial uses within their respective service areas.

The Del Valle Water Treatment Plant (DVWTP) is one of three water treatment facilities owned and operated by Zone 7. It is located on East Vineyard Road on 29 acres in an unincorporated area south of Livermore (see Figure 2.1). DVWTP has a current water treatment capacity of nearly 41 million gallons per day (mgd).

Zone 7 is proposing to construct new facilities and modify existing ones at the DVWTP to incorporate ozonation disinfection technology in its potable water treatment processes (Project). This technology has been identified as one that would be most effective to improve taste, remove odor, and maintain or improve overall water quality for water consumers in the Zone 7 service area. In addition to improving taste and odor, ozone is more effective than other water treatment technologies (such as powdered activated carbon, chlorine and chloramines) in addressing algal byproducts and chemicals of emerging concern, including endocrine disruptors, as well as pharmaceutical and personal care product residues. This enhancement to the DVWTP’s treatment capabilities would not increase the plant’s water treatment capacity.

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2. Project Description


2.2 Project Goals and Objectives The DVWTP treats water sourced from the South Bay Aqueduct and Lake Del Valle, containing constituents with inherent treatment challenges, as well as seasonal taste and odor (T&O) issues which affect the aesthetics of the water. Powdered activated carbon (PAC) facilities have been installed as a short-term solution to remove T&O compounds. In 2008-2009, Water Quality & Treatment Solutions, Inc. (WQTS) conducted pilot testing of ozone and peroxone at the DVWTP to identify the most effective alternative that would improve the overall treatment process and finished water quality. Raw water ozonation was recommended as the most viable option for the DVWTP (CDM Smith, 2017).

The key goal of the proposed Project is to improve finished water quality by providing significantly more effective treatment process\technology than powdered activated carbon, chlorine and chloramines at reducing disinfection by-products (DBPs), improving tastes and odors, treating algal byproducts and chemicals of emerging concern, including endocrine disruptors, pharmaceuticals and personal care products.

The proposed Project includes the addition of ozonation facilities, as well as the addition and modification of support facilities, such as a new carbon dioxide system for pH adjustment, and modifications to the existing sodium hypochlorite and ammonia systems to provide pre-chlorination for bromate control, and a pump station and various modifications to existing process and chemical piping to accommodate the new treatment processes. The location and layout of the ozone and supporting facilities would take into consideration anticipated future treatment plant improvements.

2.3 Project Location and Setting The DVWTP is located at 901 East Vineyard Avenue south of the City of Livermore in unincorporated Alameda County (see Figure 2.1). The proposed Project is located entirely within the DVWTP facility adjacent to the southern fence line. The DVWTP facility is fenced with 6-foot chain link fencing and locked gates. No natural vegetation occurs within the DVWTP; vegetation within the DVWTP is limited to landscaped areas at the entrance and non-native grasses and weedy species. Vegetation occurring immediately adjacent to the DVWTP is generally non-native grassland and vineyards.

The surrounding area is rolling terrain with open space, low-density residential or rural residential development, and vineyards. The DVWTP is bordered to the south and east by Sycamore Grove Park, owned and administered by the Livermore Area Recreation & Park District (LARPD), and by the Tenuta Winery vineyards and small residential estates to the west and north. PG&E has an existing energy transmission easement along the southeast boundary of the DVWTP property.

Portions of the DVWTP are visible from the ridgelines to the south and east, including full view of the existing facility from Sycamore Grove Park. The nearest residence is located approximately 800 feet west of the DVWTP fence line and a Sycamore Grove Park trail is located approximately 450 feet east from the fence line.



2.4 Proposed Project For the most part, the Project would be constructed and operated within an approximate 20,000-square-foot footprint along the DVTWP’s southern fenceline (see Figures 2.2 and 2.3). The main Project components include:

• Ozone generation building

• Ozone contactor structure and associated safety features, including ozone destruct units

• Liquid oxygen (LOX) vaporizers, facility, and storage tanks

• Carbon dioxide facility and storage tank

• Approximately 1,200 feet of trenching to accommodate new pipelines, pumps/ pump station, and vaults for plant modification to incorporate ozone technology

• Electrical upgrades, including standby generator upgrade and transformers

• Water softening system: salt storage tank and masonry block building for softeners

• New paving and concrete surfaces

• Rehabilitation of filters with new underdrain system, air-scour system, and filter media

To the extent feasible, Project components would be painted or colorized in earth-tones to match the other structures at DVWTP.

The ozone generation building would be an approximately 6,000-square-foot concrete masonry unit (CMU) structure housing the ozone generation, electrical, and mechanical rooms. The ozone generation room would be considered a hazardous space and would require continuous ventilation. A dedicated outdoor air unit serving the ozone generation room would deliver air exchange and would heat and cool air as required for space temperature control. Unit heaters would also be provided near perimeter walls for addition heating capacity. The building would also house three horizontal tube ozone generators with power supply units, closed-loop cooling water equipment (pumps and heat exchangers), a supplemental nitrogen system, and other ancillary equipment for the ozone system.

The ozone contactor structure would be a poured concrete structure approximately 5,000 square feet in size. The structure would consist of two parallel concrete ozone contactor basins with a gallery in between. It would also be considered a hazardous space requiring continuous ventilation. However, other than the code-required ventilation, no heating or cooling would be provided in this structure because the temperature of the water in the contactors would moderate the temperature of this space. Ozone destruct units would also be installed as an above ground mounted unit using a chamber and catalyst, as a safety feature, to control ozone residual off-gassing.

The LOX facility would be outdoors and include two vertical LOX storage tanks, each approximately 30 feet in height. The facility would also include three ambient air vaporizers. The LOX piping would be insulated to prevent injuries to people or wildlife from contact with cryogenic piping.

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1 View of the project site looking south from the interior of the DVWTP grounds. The ozone generation building, ozone contactor structure, LOX facility, and carbon dioxide facility would be located in the left half of this view, with the extant structures remaining to the right.

2 View from within the project site looking east from the existing raw water pump booster station. The ozone generation building, ozone contactor structure, LOX facility, carbon dioxide facilityand generators would be located in this area.


DVWTP Site Views - Project Site

SOURCE: ESA

2-6



The carbon dioxide facility would be outdoors and include a vertical liquid carbon dioxide storage tank approximately 40 feet in height. This facility would also include a refrigeration unit, vaporizer, vapor heater, and carbon dioxide feed equipment, all mounted on a concrete slab on grade. The carbon dioxide facility will be located adjacent to the LOX facility.

Smaller components of the ozonation system would consist of ceramic bubble diffusers located within the ozone contactor structure. Stainless steel piping would also be included in the ozone contactor structure to allow for transfer of ozone gas from the generation building to the bubble diffusers.

A number of modifications would be made to the existing chemical systems that are part of the water treatment process. However, these modifications would involve very little or no surficial disturbance, as they would be part of a larger component or would occur within enclosed structures.

A new standby diesel powered generator providing back-up power for the new ozone system would be located within the ozonation area of the plant. Outdoors on a slab on grade, it would be equipped with a weather/noise enclosure.

All of these Project components would be situated on an impervious paved surface ranging from 15,000 to 20,000 square feet in area. This would replace an existing paved surface of up to 4,000 square feet, for a maximum net increase in impervious surface on site of up to 16,000 square feet of paving.

To connect these components to the existing DVWTP system, approximately 1,200 feet of new trenching would be required to accommodate placement of new pipes and pump station. All of this pipe, varying from 48 to 60 inches in diameter, would be buried within the confines of the plant. A utility water pump station, consisting of vertical turbine canned pumps, would be located near the effluent of the clearwells. The pumps would draw water from the clearwells.

While some of this piping would be installed within the ozonation area of the plant, a new post-filter pipeline chlorine contactor for virus and HPC bacteria inactivation would be installed in the central portion of the plan, consisting of approximately 500 linear feet of 60-inch diameter pipe. A utility water pump station, consisting of vertical turbine canned pumps, would be located near the effluent of the clearwells. The pumps would draw water from the clearwells.

Upon installation of the project components and completion of construction activities, the remaining exposed surfaces, if any, would be graded to be consistent with the rest of the DVWTP site and either graveled or reseeded. All remaining debris and trash would be collected and disposed of in a manner consistent with all application regulations.



2.5 Project Construction

2.5.1 Project Phasing/Schedule Project construction is anticipated to begin in late February, 2018, and be completed in October, 2019 – a period of approximately 20 months. This schedule is contingent on the successful completion of project design, the environmental review process, and approval and receipt of funding from the State Revolving Fund.

The general construction sequence would be as follows, with many activities overlapping:

• Site preparation, clearing/grading – February - March, 2018

• Below-ground working (trenching, pipe installation) – August, 2018 - May, 2019

• Building and contactor construction, chemical system modifications – March, 2018 - October, 2019

• System testing – November, 2018 - October, 2019

• Site clean-up, restoration – December, 2018

Those activities executed after site clean-up and restoration are presumed to occur within the structures and would not require outdoor ground disturbance that would require further clean-up and restoration.

Construction activities would be scheduled to minimize impacts to operations at DVWTP. Connections to existing plant equipment and pipes would require temporary shutdowns of the plant, with some being concurrent. Such shutdowns would range from a period of 2 to 3 days to 2 to 3 weeks. These would be coordinated with the operations and overall maintenance schedules at the plant to avoid service interruptions for Zone 7 customers.

The daily construction schedule is anticipated to coincide and adhere to the noise standards set forth in the Alameda County noise ordinance (Chapter 6.60.070), as follows:

• Weekdays: 7:00 AM to 7:00 PM

• Weekends: 8:00 AM to 5:00 PM

It is noted that Zone 7 prohibits weekend work without consent of its Board of Directors. No work on holidays (e.g., Thanksgiving, Christmas) is anticipated.

2.5.2 Site Work, Grading, and Trenching The Project site is on a slight incline ascending from southwest to northeast. It is clear of vegetation. While most project structures would be constructed on-grade, some excavation would be required for the ozone contactor structure. The Project area would essentially be graded flat (but not level) using cut and fill techniques to result in no spoils having to be hauled off site. Overall, up to approximately 1,000 cubic yards of soil would be disturbed in this process. No trees would be removed as a result of construction.



The excavation for foundations and pipeline installation would be up to 84 inches deep. For the 48-inch pipe, trenches would be 60 inches wide, while they would be 84 inches wide for the 60-inch pipe. Asphalt cuts would be needed for this task.

2.5.3 Construction Equipment and Workers A range of large equipment would be used during construction, including:

• bobcats (2) • pick-up trucks (4) • flatbed delivery trucks (2) • boom crane (2) • excavator (2) • trencher (1) • forklift (1)

• water truck (1) • backhoe (1) • concrete vibrators (1) • roller/compactor (2) • skip loader/front loader (1) • loader (1) • generators (2)

There would be an average of 35 temporary workers over the duration of Project construction, ranging from 5 to 15 workers on any given day. It is assumed that all workers would drive to and park their personal vehicles at the Project site each workday.

2.5.4 Vehicle Trips and Haul Routes There would be approximately 460 to 540 Project-related truck deliveries at DVWTP distributed over the course of the anticipated 20-month construction period. It is possible that that would be several on some days and none on other days. Construction vehicle trips would primarily include shipments of equipment, pumps and mechanical equipment, pipe segments; cement deliveries; water truck; and, construction trailer delivery/pickup. Construction traffic would be routed to avoid major residential and retail areas. The proposed route is from Interstate Highway 580 to Isabel Avenue (State Route 84) to East Vineyard Avenue to the DVWTP access road. As needed, trucks would also access DVWTP from Interstate Highway 680 via Vallecitos Road (State Route 84) from the south. Excluding the DVWTP access road, all of these roadways are major, well-traveled routes in the area. No access through neighboring parcels would be needed; all traffic and access would occur as under current operating conditions.

Whenever possible, construction traffic trips to and from the Project site would occur during non-commuter peak hours of 10:00 AM to 4:00 PM weekdays. A possible exception would be cement deliveries during “continuous pour” events during construction, when an entire component would be constructed and a constant pour of cement is need to complete the task.

2.5.5 System Testing System testing and startup will involve closing off the new components, filling them with water and adding pressure to check for potential leaks or other signs of substandard integrity. The test water would be recycled though to the treatment plant headworks until it is confirmed that every process is in working order. The source and test water would be treated and disinfected in accordance with Zone 7 policy and all applicable water quality rules and guidance.



2.6 Project Operations and Maintenance Upon commissioning, the ozonation system would be a functioning component of the overall treatment system. It is anticipated that no new staff would be employed specifically to operate or perform routine maintenance on the system. Materials deliveries are anticipated to be up to two per month. Major repair activities would occur as needed and not on a scheduled basis. Therefore, additional trips resulting from the operation of this system would be minimal.

Waste and byproducts resulting from the ozonation process would be handled pursuant to all applicable federal, State, and local laws and regulations. Oxygen (O2) is a byproduct of this process and is anticipated to be released directly into the atmosphere. Stormwater draining from the ozonation site would be directed to an existing sludge drying basin immediately to the south. The stormwater would be stored in this basin and then returned into the plant’s treatment system to be treated and incorporated into the recycled water supply.

_________________________

References CDM Smith, 2017. (Draft) Del Valle Water Treatment Plant Ozonation Project, Draft Technical

Memorandum No. 3 – Basis of Design. March 3.


CHAPTER 3 Initial Study Environmental Checklist

1. Project Title: Del Valle Water Treatment Plant Ozonation Project

2. Lead Agency Name and Address: Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551

3. Contact Person and Phone Number: Tami Church, Zone 7 Integrated Planning (925) 454-5036

4. Project Location: Del Valle Water Treatment Plant 901 East Vineyard Avenue Livermore, Alameda County

5. Project Sponsor’s Name and Address: Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551

6. General Plan Designation(s): Water Management

7. Zoning: Major Public (utility)

8. Description of Project:

Zone 7 is proposing to construct new facilities and modify existing facilities entirely within the existing fenced site of the Del Valle Water Treatment Plant (DVWTP) to incorporate ozonation disinfection technology in its potable water treatment processes (Project). In addition to improving taste and odor, ozone is more effective than other water treatment technologies (such as powdered activated carbon, chlorine and chloramines) in addressing algal byproducts and chemicals of emerging concern, including endocrine disruptors, as well as pharmaceutical and personal care product residues. This enhancement to the DVWTP’s treatment capabilities would not increase the plant’s water treatment capacity. For additional details please refer to Chapter 2, Project Description.

9. Surrounding Land Uses and Setting.

The DVWTP is bordered by Sycamore Grove Park, owned and administered by the Livermore Area Recreation & Park District (LARPD), to the south and east, and by the Tenuta Winery vineyards and small residential estates to the west and north. The Pacific Gas and Electric

3. Initial Study Environmental Checklist


Company (PG&E) has an existing energy transmission easement along the southeast boundary of the DVWTP property.

10. Other public agencies whose approval is required (e.g., permits, financing approval, or participation agreement.)

• State Water Resources Control Board, Division of Financial Assistance Drinking Water State Revolving Fund (SRF)

• San Francisco Bay Regional Water Quality Control Board NPDES Construction Stormwater General Permit Post-Construction Stormwater Management Requirements

• Bay Area Air Quality Management District Permit to Construct Authority to Operate (revised existing approval)

• Alameda County Hazardous Materials Business Plan Amendment

11. Have California Native American tribes traditionally and culturally affiliated with the project area requested consultation pursuant to Public Resources Code section 21080.3.1? If so, has consultation begun?

No California Native American tribes have contacted the Lead Agency regarding this Project area. Tribal contact efforts are discussed in the Tribal Cultural Resources section of this Initial Study.



3.2 Environmental Checklist

Aesthetics 3.2.1

Issues (and Supporting Information Sources):

Potentially Significant

Impact

Less Than Significant

with Mitigation Incorporated


Impact No Impact

1. AESTHETICS — Would the project:

a) Have a substantial adverse effect on a scenic vista? ☐ ☐ ☒ ☐

b) Substantially damage scenic resources, including, but not limited to, trees, rock outcroppings, and historic buildings within a state scenic highway?

☐ ☐ ☐ ☒

c) Substantially degrade the existing visual character or quality of the site and its surroundings?

☐ ☐ ☒ ☐

d) Create a new source of substantial light or glare which would adversely affect daytime or nighttime views in the area?

☐ ☐ ☒ ☐

Discussion

Question a) Less than Significant. As noted in the County’s East County Area Plan, designated sensitive viewsheds in the Project vicinity include the ridgelines above the vineyards south of Livermore (Alameda County 2002). The existing DVWTP is partly or fully visible from publically-accessible viewpoints on ridgelines to the south and west, including a full view of the property from a high viewpoint immediately to the south in Sycamore Grove Park.

The Project would be located along the southern DVWTP property fence line. When viewed from surrounding viewpoints, the backdrop to the Project site would be the existing industrial and related buildings and structures at the plant. The Project-related structures, tanks, pipes, and appurtenances would be painted or colorized to be consistent with the rest of the DVWTP facilities, which are mostly earth tones, to the extent possible. The view of the Project from Sycamore Grove Park would be sporadic and visible to recreationalists utilizing trails within the park that overlook the Project site.

East County Area Plan Policy 106 for sensitive viewsheds states that structures may not be located on ridgelines or hilltops or where they will project above a ridgeline or hilltop as viewed from public roads, trails, parks and other public viewpoints, unless there is no other site on the parcel for the structure or on a contiguous parcel in common ownership on or subsequent to the date this ordinance becomes effective (Alameda County, 2002). In this case, the Project cannot be positioned in any other location within the DVWTP facility, as the grounds are mostly developed (see Figure 2.2).

Given the existing developed setting at the site, the Project would be consistent with the existing industrial character of the Project site and would not substantially affect views from scenic vistas as designated by Alameda County. This impact would be less than significant.



Question b) No Impact. In Alameda County, Caltrans-designated State Scenic and Eligible State Scenic Highways include Interstate (I-) 580, I-680 and State Route (SR) 84 west of I-680. None of these highways are in the visible vicinity of the Project site. Therefore, the Project would have no impact to State Scenic Highways or the scenic resources within them.

Question c) Less than Significant. The DVWTP is an industrial-type facility consisting of an administration building, water treatment facilities, and sludge drying beds and sludge piles. It is located on an incline and near the top of a small flat knoll within the rolling terrain of the area surrounded by open space in Sycamore Grove Park to the east and south and existing low density residential development (i.e., vineyard estates) and vineyards on the west and northwest. Intervening topography, such as rolling hills, blocks views of the DVWTP from most vantage points in the park, with the exception of the area immediately to the south. Direct, publically-accessible views of the DVWTP facility are limited to the residential/vineyard estate parcels and wineries to the west on Kalthoff Common and from trails in the park to the east and southeast.

The development to the west of the DVWTP currently has partial views of the DVWTP, including the sludge drying beds and the large filtration building, among other features. The riparian vegetation along the south tributary to Arroyo del Valle, approximately 600 feet west of the Project site, includes dense native oak trees and shrubs that form a natural visual buffer for the development directly to the west of the DVWTP. The trails and viewpoints in the adjacent portion of Sycamore Grove Park provide unobstructed views of the existing plant (see Figure 3.1).

The existing character of the site itself is developed and industrial, although it is set in rolling hills that are undeveloped and natural or in vineyard. Public opportunities to visually experience this setting are limited to travel along Kalthoff Common or trail use in the adjacent portion of Sycamore Grove Park. Although in a natural setting, the relatively limited viewing opportunities give the site a moderate visual quality.

The proposed ozonation Project would be constructed and operated within the bounds of the DVWTP. Construction activities would be temporary and visually consistent with the DVWTP site. The structures and appurtenances associated with the Project would be painted or colorized to be consistent with those at the plant to the extent feasible. Within this visual setting, the visual contrast of the Project would be low. The visual character or quality of the site or its surroundings would not be substantially degraded with the presence of this Project. Therefore, impacts to the visual character or quality of this site and its surroundings would be less than significant.

1 View looking north-northwest toward the DVWTP from the Meadowlark Loop Trail in Sycamore Grove Park.

2 View looking north-northwest toward the DVWTP from an elevated viewpoint in Sycamore Grove Park uphill to the west of Cattail Pond (not in view). Cattail Pond Loop Trail is in midview.


DVWTP Site Views - Aesthetics

SOURCE: ESA

3-6



Question d) Less than Significant. Existing sources of light in the Project area are DVWTP and the sparsely distributed residential/vineyard estates properties to the west and northwest. Existing glare is minimal due to limited reflective surfaces at the site and in the surrounding area.

The Project would not include nighttime construction; therefore, no night lighting would be required during construction. Sources of glare would be limited to glass on construction equipment or delivery vehicles (e.g., windshields). With the movement of vehicles and dependence on sky conditions, glare associated with construction would not be substantial during the daytime and would not occur at night.

No elements of the Project would have reflective surfaces that would create permanent sources of glare. The Project would include exterior lighting to be used only for security and as-needed maintenance activities. The existing DVWTP structures are equipped with exterior lighting for the same purposes. The incremental addition of lighting specifically serving the Project elements would not create a substantial new source of light when considered with the existing condition. Therefore, the Project would have a less than significant impact attributable to light or glare.

Mitigation Measures No mitigation measures are required.

References Alameda County Community Development Agency, Planning Department. May 2002 (adopted).

East County Area Plan (ECAP), Scenic Viewsheds.



Agricultural and Forest Resources 3.2.2



Impact


with Mitigation Incorporated


Impact No Impact

2. AGRICULTURAL AND FOREST RESOURCES — In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Department of Conservation as an optional model to use in assessing impacts on agriculture and farmland. In determining whether impacts to forest resources, including timberland, are significant environmental effects, lead agencies may refer to information compiled by the California Department of Forestry and Fire Protection regarding the state’s inventory of forest land, including the Forest and Range Assessment Project and the Forest Legacy Assessment project; and forest carbon measurement methodology provided in Forest Protocols adopted by the California Air Resources Board. Would the project:

a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use?

☐ ☐ ☐ ☒

b) Conflict with existing zoning for agricultural use, or a Williamson Act contract?

☐ ☐ ☐ ☒

c) Conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code section 12220(g)), timberland (as defined by Public Resources Code section 4526), or timberland zoned Timberland Production (as defined by Government Code section 51104(g))?

☐ ☐ ☐ ☒

d) Result in the loss of forest land or conversion of forest land to non-forest use?

☐ ☐ ☐ ☒

e) Involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland, to non-agricultural use or conversion of forest land to non-forest use?

☐ ☐ ☐ ☒

Discussion

Question a) No Impact. The Project and related construction activities would occur within the DVWTP property and fence line, which is in unincorporated Alameda County. The DVWTP is classified as Urban Land by the Farmland Mapping and Monitoring Program (California Department of Conservation, 2014). A Unique Farmland unit is located adjacent to the west, with Grazing Land classification around the rest of the DVWTP. As the Project would occur completely within the DVWTP property, no conversion of designated Prime Farmland, Unique Farmland or Farmland of Statewide Importance would occur. There would be no impact under this criterion.

Question b) No Impact. The DVWTP property is not under a Williamson Act contract. The DVWTP facility is located on land designated by the Alameda County General Plan’s East County Area Plan (Alameda County, 2002) as “Major Public”. The Major Public designation allows such uses as hospitals, jails, research facilities, and landfill sites, etc. (Alameda County, 2002). Surrounding land use in unincorporated areas is “Large Parcel Agriculture” and “Parklands”, and zoned



“Planned Development-South Livermore Valley Specific Plan” and “Planned Development Agricultural” within the Livermore city limits to the north of the DVWTP. These plans recognize the DVWTP as a public use. Therefore, there would be no conflict with existing zoning for agricultural use or any Williamson Act contracts with respect to the Project and no impact would occur.

Question c) No Impact. There would be no conflict with existing zoning as all proposed construction would occur within the existing DVWTP facility on land zoned for Major Public use and the Project would not require or result in any zoning changes.

Question d) No Impact. No forest lands exist at or near the Project site. The Project would not increase water supply which would spur development such that forestlands would be converted to other uses. Therefore, no impact would occur.

Question e) No Impact. As noted above, the Project would not increase water supply which would encourage development elsewhere. Therefore, it would not involve any other changes in the existing environment which could result in conversion of farmland or timber. No impact would occur.


References Alameda, County of, 2002. East County Area Plan, Adopted as amended May 2002, available

online at: http://www.acgov.org/cda/planning/generalplans/index.htm.

California Department of Conservation, 2014, Farmland Mapping and Monitoring Program October 14, 2014, available online at: http://www.conservation.ca.gov/dlrp/fmmp/Pages/Alameda.aspx ftp://ftp.consrv.ca.gov/pub/dlrp/FMMP/pdf/2014/, accessed May 12, 2017.

http://www.acgov.org/cda/planning/generalplans/index.htm

http://www.conservation.ca.gov/dlrp/%E2%80%8Cfmmp/%E2%80%8CPages/Alameda.aspx%20ftp:/ftp.consrv.ca.gov/pub/dlrp/FMMP/pdf/2014/

http://www.conservation.ca.gov/dlrp/%E2%80%8Cfmmp/%E2%80%8CPages/Alameda.aspx%20ftp:/ftp.consrv.ca.gov/pub/dlrp/FMMP/pdf/2014/



Air Quality 3.2.3



Impact

Less Than Significant with

Mitigation Incorporated


Impact No Impact

3. AIR QUALITY — Where available, the significance criteria established by the applicable air quality management or air pollution control district may be relied upon to make the following determinations. Would the project:

a) Conflict with or obstruct implementation of the applicable air quality plan?

☐ ☒ ☐ ☐

b) Violate any air quality standard or contribute substantially to an existing or projected air quality violation?

☐ ☒ ☐ ☐

c) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)?

☐ ☒ ☐ ☐

d) Expose sensitive receptors to substantial pollutant concentrations?

☐ ☐ ☒ ☐

e) Create objectionable odors affecting a substantial number of people?

☐ ☐ ☒ ☐

Discussion

Question a) Less than Significant with Mitigation. The Project site is within the San Francisco Bay Area Air Basin (Bay Area), which is regulated by the Bay Area Air Quality Management District (BAAQMD) and currently designated as a nonattainment area for state and national ozone standards, state particulate matter (PM10 and PM2.5) standards, and the federal PM2.5 (24-hour) standard. The most recently adopted air quality plan to address nonattainment issues for the Bay Area is the 2017 Bay Area Clean Air Plan (2017 CAP, BAAQMD 2017). The 2017 CAP provides a regional strategy to protect public health and protect the climate by continuing progress toward attaining all state and federal air quality standards; eliminating health risk disparities from exposure to air pollution among Bay Area communities; transitioning the region to a post-carbon economy needed to achieve greenhouse gas (GHG) reduction targets for 2030 and 2050; and providing a regional climate protection strategy that will put the Bay Area on a pathway to achieve those GHG reduction targets. The 2017 CAP includes a wide range of 85 control measures designed to decrease emissions of the air pollutants that are most harmful to Bay Area residents, such as particulate matter, ozone, and toxic air contaminants; to reduce emissions of methane and other “super-GHGs” that are potent climate pollutants in the near-term; and to decrease emissions of carbon dioxide by reducing fossil fuel combustion (BAAQMD, 2017a).

The BAAQMD CEQA Guidelines recommend that a project’s consistency with the current CAP be evaluated using the following three criteria:

a. The project supports the goals of the Air Quality Plan,

b. The project includes applicable control measures from the CAP, and



c. The project does not disrupt or hinder implementation of any control measures from the CAP.

If it can be concluded with substantial evidence that a project would be consistent with the above three criteria, then the BAAQMD considers it to be consistent with air quality plans prepared for the Bay Area (BAAQMD, 2011).

The primary goals of the 2017 CAP are to attain air quality standards, reduce population exposure and protect public health in the Bay Area, and reduce GHG emissions and protect the climate. The BAAQMD-recommended guidance for determining if a project supports the goals in the current CAP is to compare project-estimated emissions with BAAQMD thresholds of significance. If project emissions would not exceed the thresholds of significance after the application of all feasible mitigation measures, the project would be consistent with the goals of the 2017 CAP. As indicated in the following discussion with regard to air quality impact Questions b) and c), the Project would result in a potential significant impact related to construction emissions that could be reduced to less-than-significant with implementation of Mitigation Measure AQ-1, Implement BAAQMD Basic Construction Mitigation Measures, and would not result in long-term adverse air quality impacts. Following the implementation of Mitigation Measure AQ-1, the Project would support the primary goals of the 2017 CAP.

As noted above, the 2017 CAP contains 85 control measures aimed at reducing air pollution in the Bay Area. Projects that incorporate all feasible air quality plan control measures are considered consistent with the CAP. The 2017 CAP does not contain any measures specific to water treatment plants and, therefore, no inconsistency with the 2017 CAP is identified. With no specific control measures from the 2017 CAP applicable to water pollution control plants, the Project would not hinder implementation of CAP control measures.

In summary, the Project would be consistent with all three criteria listed above to evaluate consistency with the 2017 CAP and, therefore, would not conflict with or obstruct implementation of the 2017 CAP. This would be a less-than-significant impact.

Question b) Less than Significant with Mitigation. The Federal Clean Air Act and the California Clean Air Act both require the establishment of standards for ambient concentrations of air pollutants, called Ambient Air Quality Standards (AAQS). The federal AAQS, established by U.S. Environmental Protection Agency (USEPA), are typically higher (less stringent) or the same as the state AAQS, which are established by the California Air Resources Board (CARB) and enforced by the BAAQMD based on the Project’s location.

The Bay Area Air Basin experiences occasional violations of ozone and particulate matter (PM10

and PM2.5) standards. Therefore, the Project area currently is designated as a non‐attainment area for violation of the state 1‐hour and 8‐hour ozone standards, the federal ozone 8‐hour standard, the state respirable particulate matter (PM10) 24‐hour and annual average standards, the state fine particulate (PM2.5) annual average standard, and the federal PM2.5 24‐hour standard. The Project area is designated as attainment for all other state and federal standards (BAAQMD, 2017b).



Project Construction Construction activities associated with the Project would involve use of equipment that would emit exhaust containing ozone precursors (reactive organic gases or ROG, and nitrogen oxides, or NOx). On-site and off-site vehicle activity associated with material transport and construction worker commutes would also generate emissions. Emission levels for these activities would vary depending on the number and types of equipment used, duration of use, operation schedules, and the number of construction workers. Criteria pollutant emissions of ROG and NOx from these emission sources would incrementally add to the regional atmospheric loading of ozone precursors during Project construction.

Air pollutant emissions of ROG, NOX, PM10, and PM2.5 that would be generated by off-road construction equipment (e.g., excavators, graders, loaders) were estimated using the CalEEMod (version 2016.3.1) model along with the Project-specific construction schedule and equipment requirements that would be used during the following construction phases of the Project:

• Site preparation, clearing/grading – February - March, 2018 • Below-ground working (trenching, pipe installation) – August, 2018 - May, 2019 • Building and contactor construction, chemical system modifications – March, 2018 -

October, 2019 • System testing – November, 2018 - October, 2019 • Site clean-up, restoration – December, 2018

Project construction emissions were modeled under the assumption that construction would begin in January 2018 and would take approximately 440 workdays to complete over a period of approximately 22 months.1 Average daily construction emissions were estimated by dividing the total construction emissions by the number of workdays. All assumptions and calculations used to estimate the Project‐related construction emissions are provided in Appendix A. Estimated average daily emissions are shown in Table 3.1 (below) and are compared to the BAAQMD thresholds.

TABLE 3.1 AVERAGE DAILY CONSTRUCTION-RELATED POLLUTANT EMISSIONS (POUNDS/DAY)

Emissions ROG NOx Exhaust PM10*

Exhaust PM2.5*

Total Project Emissions 1.5 12.6 0.7 0.6

BAAQMD Construction Threshold 54 54 82 54

Significant Impact? No No No No

* BAAQMD’s construction-related significance thresholds for PM10 and PM2.5 apply to exhaust emissions only and not to fugitive dust.

1 Subsequent to the air quality modeling that was conducted for the Project in May, 2017, the estimated Project

construction schedule has been refined to begin in February, 2018, and conclude in October, 2019, for a total period of approximately 20 months. This decrease in construction duration would not have an effect on the average daily construction emissions; therefore, the emissions estimates in Table 3.1 reflect the refined construction schedule.



As indicated in Table 3.1, the average daily construction exhaust emissions would not exceed the BAAQMD’s significance thresholds. Therefore, impacts associated with the potential for construction‐related exhaust emissions to result in or contribute to a violation of an air quality standard would be less than significant.

In addition to exhaust emissions, emissions of fugitive dust would also be generated by construction activities associated with grading and earth disturbance, travel on paved and unpaved roads, etc. Such emissions could result in a potential significant impact. With regard to fugitive dust emissions, the BAAQMD Guidelines focus on implementation of recommended dust control measures rather than a quantitative comparison of estimated emissions to a significance threshold. For all projects, the BAAQMD recommends the implementation of its Basic Control Mitigation Measures (BAAQMD, 2011). The implementation of the BAAQMD’s fugitive dust Basic Control Mitigation Measures, which are listed in Mitigation Measure AQ-1 would reduce potential impacts associated with fugitive dust emissions to a less-than-significant level.

Project Operation Once construction is complete, the only source of operational emissions would be from the periodic testing of the proposed emergency standby generator at the ozonation plant. The standby generator would be subject to BAAQMD Regulation 2 and would require a BAAQMD permit to operate. Routine testing for emergency generators would be restricted to 1 hour per day and a maximum of 50 hours per year. In addition, the generator would be subject to Best Available Control Technology (BACT) standards as part of the permit. Based on the 30 percent design for the Project (CDM Smith, 2017), it is anticipated that the rating of the proposed emergency standby generated would be approximately 60 horsepower (hp). Daily emissions that would be associated with 1 hour of proposed emergency generator testing are shown in Table 3.2 and are compared to the BAAQMD thresholds. The emission would be well under the significance thresholds; therefore, the operational emissions of the Project would be less than significant.

TABLE 3.2 MAXIMUM DAILY EMERGENCY GENERATOR TESTING POLLUTANT EMISSIONS (POUNDS/DAY)

Emissions ROG NOx PM10 PM2.5

Emergency Generator Testing Emissions 0.1 0.3 <0.1 <0.1

BAAQMD Construction Threshold 54 54 82 54

Significant Impact? No No No No

Question c) Less than Significant with Mitigation. In developing thresholds of significance for air pollutants, BAAQMD considered the emission levels at which a project’s individual emissions would be cumulatively considerable. Therefore, if a project would result in an increase in ROG, NOx, PM10, or PM2.5 of more than its respective average daily emissions significance thresholds, then it would also contribute considerably to a significant cumulative impact. If a project would not exceed the significance thresholds, its emissions would not be cumulatively considerable. As presented in discussion b) above, the Project’s short‐term construction exhaust emissions would



not exceed the applicable significance thresholds and, with the implementation of Mitigation Measure AQ‐1, the Project’s fugitive dust emission-related impacts also would be reduced to a less‐than‐significant level. In addition, as the proposed emergency backup generator is the only operational source of air pollutant emissions and would be subject to permitting requirements per BAAQMD Regulation 2, and its emissions from routine testing and maintenance would not exceed the applicable significance thresholds, Project operations would not cause or contribute substantially to a significant cumulative impact. In summary, the Project’s operational emissions would not be cumulatively considerable and construction-related cumulative impacts would be mitigated to a less‐than‐significant level.

Question d) Less than Significant. The BAAQMD recommends that lead agencies assess the incremental toxic air contaminant (TAC) exposure risk to all sensitive receptors (e.g., residences, schools) within a 1,000‐foot radius of a project’s fence line (BAAQMD, 2015). Long‐term TAC emissions that would be associated with the Project would be from the routine testing of the proposed emergency backup generator. However, the generator would be required to comply with the BAAQMD’s permit requirements for a stationary source. The BAAQMD would not approve an Authority to Construct or a Permit to Operate any new or modified source of TACs that exceeds a cancer risk of 10 in one million or a chronic or acute hazard index of 1.0. Therefore, the health risks impact of the backup generator would be less than significant.

Short‐term Project construction activities would generate diesel particulate matter (DPM), which is considered to be a TAC. The majority of DPM exhaust emissions that would be generated during construction would be from the use of diesel off‐road equipment with a smaller amount generated by the use of heavy duty trucks to deliver building material and equipment to the site. The prevailing wind direction in the Project area is westerly and the residences in the vicinity are to the west of the site. Therefore, the residences are upwind, which would limit their exposure to Project-related emissions. The closest residential receptor is located over 800 feet west of the DVWTP property line and approximately 1,060 feet west of the nearest ozonation Project component site associated with the proposed post-filter pipeline. The main Project area associated with the ozonation Project is along the eastern border of the DVWTP site, which is more than 1,240 feet from the nearest residential receptor.

The dose to which receptors are exposed is the primary factor affecting health risk from exposure to TACs. Dose is a function of the concentration of a substance or substances in the environment and the duration of exposure to the substance. According to the Office of Environmental Health Hazard Assessment (OEHHA), health risk assessments should be based on a 9, 30, and/or 70-year exposure periods to determine the health risk to sensitive receptors from cancer or chronic non‐cancer health effects of TAC emissions (such as DPM). However, OEHHA also states that such health risk assessments should be limited to the duration of the emission‐producing activities associated with the Project, unless the activities occur for less than six months. Activities that would last more than two months, but less than six months, are recommended to be evaluated as if they would last for six months (OEHHA, 2015).



DPM emissions would be generated at the Project site over a period of 22 months. Table 3.1 above, shows that the average daily PM10 exhaust emissions from construction at the Project site would be approximately 0.7 pound per day. At this emission rate, exposure of a receptor located more than 1,000 feet and upwind from the Project over a period of less than 2 years (compared to the exposure periods used in health risk assessments) would not be considered substantial and would not result in a significant incremental cancer risk. Even though the Project would result in a less-than-significant impact related to incremental cancer risk and the exposure of sensitive receptors to substantial pollutant concentrations, the implementation of Mitigation Measure AQ‐1 would further limit receptors’ exposure to DPM emissions because it would require the contractor for the Project to implement anti‐idling measures when operating construction equipment. The impact related to exposing sensitive receptors to substantial pollutant concentrations would be less than significant.

Question e) Less than Significant. The Project does not include any long-term sources of odor. Diesel equipment used to construct the Project may emit objectionable odors associated with combustion of diesel fuel. However, as the nearest sensitive receptors that could be affected by this would be located more than 1,000 feet upwind from the site of construction, any odor emissions during the 22-month construction period or during the intermittent testing of the proposed backup generator would be less than significant.

Mitigation Measures Based on the analysis presented above, implementation of the following mitigation measures would reduce the potential impacts to air resources to less than significant.

Mitigation Measure AQ-1: Implement BAAQMD Basic Construction Mitigation Measures.

The following applicable Bay Area Air Quality Management District’s (BAAQMD) Basic Construction Mitigation Measures shall be implemented by Zone 7 or construction contractors to reduce emissions of fugitive dust and equipment exhaust:

• All exposed surfaces (e.g., parking areas, staging areas, soil piles, graded areas, and unpaved access roads) shall be watered two times per day.

• All haul trucks transporting soil, sand, or other loose material off-site shall be covered.

• All visible mud or dirt track-out onto adjacent public roads shall be removed using wet power vacuum street sweepers at least once per day. The use of dry power sweeping is prohibited.

• All vehicle speeds on unpaved roads shall be limited to 15 mph.

• All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible. Building pads shall be laid as soon as possible after grading unless seeding or soil binders are used.



• Idling times shall be minimized either by shutting equipment off when not in use or reducing the maximum idling time to 5 minutes (as required by the California airborne toxics control measure Title 13, Section 2485 of California Code of Regulations [CCR]). Clear signage shall be provided for construction workers at all access points.

• All construction equipment shall be maintained and properly tuned in accordance with manufacturer’s specifications. All equipment shall be checked prior to the start of construction by a certified visible emissions evaluator.

• Post a publicly visible sign with the telephone number and person to contact at Zone 7 regarding dust complaints. This person shall respond and take corrective action within 48 hours. The BAAQMD’s phone number shall also be visible to ensure compliance with applicable regulations.

References Bay Area Air Quality Management District (BAAQMD), California Environmental Quality Act –

Air Quality Guidelines, May 2011.

BAAQMD, 2015. Air Quality Standards and Attainment Status, available at http://www.baaqmd.gov/research-and-data/air-quality-standards-and-attainment-status, last updated January 5, 2017b.Office of Environmental Health Hazard assessment (OEHHA), Air Toxics Hotspot Program, Risk Assessment Guidelines - Guidance Manual for Preparation of Health Risk Assessments, February.

BAAQMD, 2017. Spare the Air: Cool the Climate – Final 2017 Clean Air Plan, adopted April 19.

CDM Smith, 2017. Del Valle Water Treatment Plant Ozonation Project, Project Drawings, 30% Submittal Not for Construction, May 2017.

http://www.baaqmd.gov/%E2%80%8Cresearch-and-data/air-quality-standards-and-attainment-status



Biological Resources 3.2.4



Impact




Impact No Impact

4. BIOLOGICAL RESOURCES — Would the project:

a) Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special-status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service?

☐ ☒ ☐ ☐

b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service?

☐ ☐ ☐ ☒

c) Have a substantial adverse effect on federally protected wetlands as defined by Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means?

☐ ☒ ☐ ☐

d) Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites?

☐ ☐ ☐ ☒

e) Conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance?

☐ ☐ ☐ ☒

f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan?

☐ ☐ ☐ ☒

Discussion

Question a) Less than Significant with Mitigation. The DVWTP contains no habitat for sensitive or special status plants or wildlife, including threatened and endangered species, within the fenced perimeter of the facility. Ground cover within the facility consists of pavement, gravel, bare ground and non-native annual grassland. Typical species found in this habitat include wild oat (Avena fatua), ripgut brome (Bromus diandrus), black mustard (Brassica nigra), Italian thistle (Carduus pycnocephalus), and wild radish (Raphanus sativus) (see Figure 3.2). The non-native annual grassland provides small amounts of habitat for common birds, reptiles and mammals, but no special-status species would be expected on a resident basis.

As shown in Appendix B, the DVWTP occurs within the geographic range of several listed and special status species (CNDDB, 2017). While no suitable habitat for special status species is found on the Project site, aquatic habitat for California red-legged frog (Rana draytonii) (Federal listed threatened, California Species of Special Concern), California tiger salamander (Ambystoma californiense) (Federal and state-listed threatened) and western pond turtle (Actinemys marmorata) (California Species of Special Concern) is located one-half mile southeast in Sycamore Grove Park

1 Cattail Pond 0.5 mile southeast of DVWTP contains aquatic habitat for California red-legged frog, western pond turtle, and California tiger salamander.

2 The project site within facility footprint contains non-native annual grassland species. Though this vegetation does not provide habitat for special status species, migratory birds may nest here.


DVWTP Site Views - Biological Resources

SOURCE: ESA

3-18



on Livermore Area Regional Park District (LARPD) land (see Figure 3.2). LARPD signage indicates the presence of western pond turtles and California red-legged frogs at “Cattail Pond”. The rolling annual grassland areas between this pond and the DVWTP fence line lack barriers to wildlife movement. The presence of California ground squirrel (Otospermophilus beecheyi) and their numerous burrows suggests that the area provides upland refugia for California tiger salamander.

The western pond turtle is not expected within DVWTP facility, due to a lack of suitable habitat. The DVWTP facility is within the dispersal range of California tiger salamander and California red-legged frog, which are known to disperse one mile or more from aquatic habitat. The chain-link fence surrounding the facility does not constitute a movement barrier to these species. Hence, any California tiger salamander or California red-legged frog that entered the DVWTP facility during work activities could be subject to injury or mortality as a result of construction activities or interactions with equipment. Injury to or mortality of California red-legged frog or tiger salamander is a potentially significant impact, which could be reduced to a less-than-significant level by implementation of the Mitigation Measure BIO-1, Exclusion Fencing.

Suitable nesting habitat is present in non-native grasslands in and near the Project site. Grasslands and associated shrubs could support nesting passerine birds such as red-winged blackbird (Agelaius phoeniceus), western meadowlark (Sturnella neglecta), and savannah sparrow (Passerculus sandwichensis), and possibly other avian species (see Figure 3.2). No bat roosting habitat would be impacted by Project activities as none exists at the Project site. Actively nesting birds are protected under the Migratory Bird Treaty Act and California Fish and Game (CDFG) Code, and “take” would constitute a significant impact. The implementation of Mitigation Measure BIO-2, Pre-Construction Bird Surveys, would reduce potential impacts on nesting birds to a less-than significant level.

Question b) No Impact. No riparian or sensitive natural communities are located within the Project site at the DVWTP. The facility is located in a disturbed area and ground cover consists of pavement, gravel, bare ground and non-native annual grassland. Vegetation immediately adjacent to the DVWTP consists of non-native grassland, ornamental plants and vineyard. No sensitive natural communities would be impacted by the Project.

Question c) Less Than Significant with Mitigation. No wetlands are located within the DVWTP property. The nearest potential wetland area is approximately 0.5-mile from the facility in Cattail Pond in Sycamore Grove Park. Arroyo del Valle drainage, located approximately 0.75-mile north of the facility, contains potential wetlands. With the stormwater drainage incorporated into the Project, it is not anticipated that any runoff from the facility would reach these water bodies. However, Mitigation Measure WQ-1, Stormwater Quality Protection Plan, in the Hydrology and Water Quality section of this Initial Study would be implemented to minimize the potential for pollutants in runoff from the facility. Therefore, this impact to protected wetlands would be less than significant.



Question d) No Impact. The Project site is within the DVWTP property, which is fenced. To the north of the facility are major roads, which are barriers to wildlife movement. There are no opportunities for movement of any native resident or migratory fish, since the Project site lacks aquatic features. To the south and east, Sycamore Grove Park provides movement corridors for wildlife that would not be impeded by construction at the facility. Project activities would not obstruct or interfere with wildlife corridors or impede the use of wildlife nursery sites. Therefore, the Project would result in no impact to fish or wildlife movement, or the use of nursery sites.

Question e) No Impact. The Project would be located in non-native annual grassland, gravel, and bare ground areas of the facility. No trees would be removed in order to construct the Project. The Project is consistent with Alameda County Tree Ordinance (Alameda County 2016). No other local policies or ordinances protect biological resources that could be affected by construction or operation of the Project. Thus, no impacts to biological resources, including mature or heritage trees, would occur.

Question f) No Impact. The Project site is not within an area subject to any Habitat Conservation Plan adopted pursuant to the federal Endangered Species Act or any Natural Community Conservation Plan or other approved local, regional, or state habitat conservation plan.

Mitigation Measures Based on the analysis presented above, implementation of the following mitigation measures would reduce the potential impacts to biological resources to less than significant.

Mitigation Measure BIO-1: Exclusion Fencing.

Zone 7 or its construction contractor shall install a wildlife exclusion fence at the perimeter of the work area, as established by a qualified biologist, and maintained for the duration of construction. The fence shall contain exit funnels to allow any California red-legged frog or California tiger salamander within the construction area to leave without human intervention, while preventing entry into the construction zone. Exit funnels shall be placed no more than 100 feet apart along the fence. The exit funnels shall be installed at ground level. Work would be prohibited outside the exclusion fencing. The contractor shall remove the fence upon completion of construction.

Mitigation Measure BIO-2: Pre-Construction Bird Surveys.

If construction or vegetation removal must be performed during the nesting period (February 1 through August 31) a qualified biologist shall survey vegetation to verify the presence or absence of nests no more than 7 days prior to the start of construction activities, including the clearance of vegetation. If no nests are found and the site is cleared of vegetation, no further survey would be required. If active nests are observed, Zone 7 or its construction contractor, in consultation with a qualified biologist, shall establish buffer zones around nest areas. Typical starting nest buffers are 100 feet for



passerine birds, depending upon the nature of proposed activities and the sensitivity of the identified bird to disturbance, and 150 to 250 feet for raptors. Construction activities shall be avoided or modified within the buffer area until young birds have fledged, which shall be confirmed by the qualified biologist. Buffer sizes may be reduced from the initially established distances following review by the qualified biologist and/or coordination with CDFW.

References Alameda County, 2016, Revised Tree Ordinance O-2016-66. https://static1.squarespace.com/

static/57573edf37013b15f0435124/t/58f64e2515d5dbcc64e54302/1492536870104/BOS+signed+Tree+Ordinance+and+Fees+and+Fines+Schedule+-+ADOPTED+12-2016.pdf

CNDDB, 2017. California Department of Fish and Game, Biogeographic Data Branch. 2017. California Natural Diversity Database. Sacramento, CA.

https://static1.squarespace.com/%E2%80%8Cstatic/57573edf37013b15f0435124/t/58f64e2515d5dbcc64e54302/1492536870104/BOS+signed+Tree+Ordinance+and+Fees+and+Fines+Schedule+-+ADOPTED+12-2016.pdf





Cultural Resources 3.2.5



Impact




Impact No Impact

5. CULTURAL RESOURCES — Would the project:

a) Cause a substantial adverse change in the significance of a historical resource as defined in §15064.5?

☐ ☐ ☐ ☒

b) Cause a substantial adverse change in the significance of an archaeological resource pursuant to §15064.5?

☐ ☒ ☐ ☐

c) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature?

☐ ☒ ☐ ☐

d) Disturb any human remains, including those interred outside of formal cemeteries?

☐ ☒ ☐ ☐

Discussion ESA completed a records search at the Northwest Information Center (NWIC) of the California Historical Resources Information System on March 23, 2017 (File No. 16-1448). The purposes of the records search were to: (1) determine whether known cultural resources have been recorded within or adjacent to the project area; (2) assess the likelihood for unrecorded cultural resources to be present based on historical references and the distribution of nearby sites; and (3) develop a context for the identification and preliminary evaluation of cultural resources.

Results of the records search indicate that ten (10) cultural resources have been identified within the 0.5 mile records search radius. None of these resources are recorded within the Project area. These resources consist of historic-era remnants of homesteads and agricultural activities. No prehistoric archaeological resources have been previously recorded within the 0.5 mile records search radius. The nearest known prehistoric resources are over 2.5 miles to the north and 4 miles to the south of the Project area.

The Project is located in older (quaternary), non-marine alluvial terrace deposits, or alluvial fan. This geologic formation has a very low potential to contain buried archaeological resources. Archaeological resources within this geologic context would be at or very near to the surface and would be identifiable during a pedestrian surface survey; no cultural resources were identified during the surface survey of the Project area completed by a Registered Professional Archaeologist on April 6, 2017.

ESA reviewed geologic and soil maps to determine the paleontological sensitivity of the Project area (NRCS, 2017; Witter et al., 2007). Geologic maps indicate that the Project area is underlain by Pleistocene-age alluvium. Based on the Society of Vertebrate Paleontology (SVP) criteria (SVP, 2010), Pleistocene-age alluvium in general has a high paleontological sensitivity. However, given the extensive disturbance of the Project area and the relatively shallow depth of disturbance for the Project, the paleontological sensitivity is lessened (UCMP, 2017).



Question a) No Impact. CEQA Guidelines Section 15064.5 requires the lead agency to consider the effects of a project on historical resources. An historical resource is defined as any building, structure, site, or object listed in or determined to be eligible for listing in the California Register, or determined by a lead agency to be significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, or cultural annals of California. The following discussion focuses on architectural and structural resources. Archaeological resources, including archaeological resources that are potentially historical resources according to CEQA Guidelines Section 15064.5, are addressed under Question b, below.

Through a records search, background research, and a field survey, no historical resources were identified in the Project area (ESA, 2017). As such, there are no architectural or structural resources in the Project area that qualify as historical resources, as defined in CEQA Guidelines Section 15064.5; therefore, the Project would not result in an impact on any historical resources, as defined in CEQA Guidelines Section 15064.5.

Question b) Less than Significant with Mitigation. This section discusses archaeological resources, both as historical resources according to CEQA Guidelines Section 15064.5, as well as unique archaeological resources, as defined in Public Resources Code Section 21083.2(g). A significant impact would occur if the project would cause a substantial adverse change to an archaeological resource through physical demolition, destruction, relocation, or alteration of the resource.

Through a records search, background research, a geologic analysis, and a field survey, no archaeological resources have been identified in the Project area and the Project area has a low potential to uncover buried archaeological resources (ESA, 2017). As such, the Project would not impact any archaeological resources pursuant to CEQA Guidelines Section 15064.5.

While unlikely, if any previously unrecorded archaeological resource were identified during Project ground disturbing activities and were found to qualify as an historical resource per CEQA Guidelines Section 15064.5 or a unique archaeological resource, as defined in Public Resources Code Section 21083.2(g), any impacts to the resource resulting from the Project could be potentially significant. Any such potential significant impacts would be reduced to a less-than-significant level by implementing Mitigation Measure CUL-1, Accidental Discovery of Archaeological Resources.

Question c) Less than Significant with Mitigation. Through a search of the University of California Museum of Paleontology (UCMP) database, no paleontological resources are known to be in the Project area or vicinity (UCMP, 2017). The Project area is underlain by Pleistocene-age alluvium, which in general has a high paleontological potential (SVP, 2010).

Given the previous disturbance in the Project area and the relatively shallow depth of disturbance, paleontological resources are not expected to be uncovered during ground disturbing activities. In



the unlikely event that paleontological resources are uncovered, the significance of resource would be unknown until examined by a qualified paleontologist. This would be a potentially significant impact on paleontological resources. Any such potential significant impacts would be reduced to a less-than-significant level by implementing Mitigation Measure CUL-2, Accidental Discovery of Paleontological Resources.

Question d) Less than Significant with Mitigation. Through a records search and background research, no human remains are known to exist in the Project area (ESA, 2017). Therefore, the Project is not anticipated to impact human remains, including those interred outside of formal cemeteries.

While unlikely, if any previously unknown human remains were encountered during ground disturbing activities, any impacts to the human remains resulting from the Project could be potentially significant. Any such potential significant impacts would be reduced to a less-than-significant level by implementing Mitigation Measure CUL-3, Accidental Discovery of Human Remains.

Mitigation Measures Based on the analysis presented above, implementation of the following mitigation measures would reduce the potential impacts to cultural resources to less than significant.

Mitigation Measure CUL-1: Accidental Discovery of Archaeological Resources.

If cultural resources are encountered during construction, the contractor shall avoid any further disturbance of the materials and immediately discontinue earthwork within 100 feet of the find (in accordance with Alameda County Policy on Cultural Resources [Alameda County 2002]). At that time, Zone 7 shall contact a qualified archaeologist, certified by the Register of Professional Archeologists (RPA), to evaluate the situation. Any identified archaeological resources shall be recorded by the archeologist on Department of Parks and Recreation 523 form, or similar forms. Project personnel shall not collect cultural resources. Procedures for stopping construction, in the event that cultural resources are exposed, shall be part of the Project plans and documents. In anticipation of discovering cultural deposits, procedures shall be in place so that the contractor can move on to another phase of work, thus allowing sufficient time to evaluate the nature and significance of the find and implement appropriate management procedures.

Mitigation Measure CUL-2: Accidental Discovery of Paleontological Resources.

If paleontological resources, such as fossilized bone, teeth, shell, tracks, trails, casts, molds, or impressions are encountered by construction personnel during Project implementation, all construction activities within 50 feet shall halt and the contractor shall notify Zone 7. Zone 7 shall retain a qualified paleontologist to inspect the findings within 24 hours of discovery. The paleontologist shall assess the nature and importance of the find and, if necessary, develop appropriate treatment measures in conformance with Society of Vertebrate Paleontology standards (2010), and in consultation with Zone 7.



Mitigation Measure CUL-3: Accidental Discovery of Human Remains.

In the event that human remains are encountered, ground disturbing activities 100 feet of that location shall cease immediately. There shall be no further excavation or disturbance within this radius until the County Coroner makes a determination of whether an investigation of the cause of death is required or that the remains are Native American. If the coroner determines that the remains are Native American, then the Native American Heritage Commission in Sacramento shall be contacted within 24 hours (by County coroner), along with the Most Likely Descendant(s) of the deceased Native American (by Native American Heritage Commission), and disposition of the remains shall be in accordance with all applicable laws and regulations.

References ESA, 2017. Zone 7 Water Agency Del Valle Water Treatment Plant Ozone Project, Cultural

Resources Survey Report. Prepared for Zone 7 Water Agency. On file, NWIC, May.

Natural Resource Conservation Service (NRCS), Soil Survey Staff, Natural Resource Conservation Service, U.S. Department of Agriculture. Web Soil Survey. Available online at http://websoilsurvey.nrcs.usda.gov/. Accessed May 2017.

Northwest Information Center (NWIC), 2017. File No. 16-1448. California Historical Resources Information System at Sonoma State University, Rohnert Park. On file at ESA, March 23.

Society of Vertebrate Paleontology (SVP), 2010. Assessment and mitigation of adverse impacts to nonrenewable paleontologic resources: standard guidelines, Society of Vertebrate Paleontology News Bulletin.

University of California Museum of Paleontology (UCMP). Collections Database Search Results. Available at: www.ucmp.berkeley.edu/science/collections.php. Accessed May 2017.

Witter, R.C., K.L. Knudsen, J.M. Sowers, C.M. Wentworth, R.D. Koehler, and C.E. Randolph. Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California. United State Geological Survey Open-file report 2006-1037, 2006.

http://websoilsurvey.nrcs.usda.gov/

http://www.ucmp.berkeley.edu/science/collections.php.%20Accessed%20May%202017



Geology, Soils, and Seismicity 3.2.6



Impact




Impact No Impact

6. GEOLOGY and Soils — Would the project:

a) Expose people or structures to potential substantial adverse effects, including by exacerbating the existing risk of loss, injury, or death involving:

i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? (Refer to Division of Mines and Geology Special Publication 42.)

☐ ☐ ☐ ☒

ii) Strong seismic ground shaking? ☐ ☐ ☐ ☒ iii) Seismic-related ground failure, including

liquefaction? ☐ ☐ ☐ ☒

iv) Landslides? ☐ ☐ ☐ ☒ b) Result in substantial soil erosion or the loss of topsoil? ☐ ☒ ☐ ☐ c) Be located on a geologic unit or soil that would

become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction, or collapse?

☐ ☐ ☐ ☒

d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating or exacerbating substantial risks to life or property?

☐ ☐ ☐ ☒

e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water?

☐ ☐ ☐ ☒

Discussion

Question a.i) No Impact. No Alquist- Priolo earthquake zones are mapped on the Project area (CGS, 2008). The nearest is approximately 4 miles to the west. However, there are late Quaternary faults in the Project area, including the Las Positas fault which trends southwest-northeast to the south of the DVWTP site. The most recent movement on any part of this fault was in 1980 (Department of Conservation 2015). The DVWTP facility was present in 1980 and did not sustain significant damage.

The Project would not cause rupture of a known earthquake fault or exacerbate any existing risk of loss, injury, or death involving the rupture of a known earthquake fault. According to the U.S. Geologic Survey and others, human activities that remove or add remove substantial amounts of pressure to the geography of an area can cause that area to shift, which can result in induced earthquakes. Such activities include fluid injection (e.g., wastewater injection and hydraulic fracturing or “fracking”), the construction of artificial lakes, and the drilling of geothermal energy wells (USGS 2015; Templeton 2015). The Project does not propose and would not result in any activity that would add or remove a large amount of pressure to the geography of the area.



Therefore, the Project would result in no impact related to the exposure people or structures to potential substantial adverse effects, including by exacerbating the existing risk of loss, injury, or death involving the rupture of a known earthquake fault.

Question a.ii and a.iii) No Impact. The Project area lies within a region of California that contains many active and potentially active faults and is considered an area of high seismic activity. It is estimated that the Bay Area as a whole has a 63 percent chance of experiencing an earthquake of magnitude 6.7 or higher before 2036 (USGS 2008). The individual faults posing the greatest threat to the Bay Area including the project area are the Hayward-Rodger’s Creek fault and the San Andreas fault. Other principal faults capable of producing significant earthquakes in the general vicinity of the Project area include the Calaveras, Concord–Green Valley, Marsh Creek–Greenville, and the San Gregorio faults. The Project area is located near the Las Positas fault, besides being in a seismically active region.

The passage of seismic waves (such as surface waves near the epicenter of an earthquake or a volcanic eruption) cause strong seismic ground-shaking, which can trigger ground failures such as liquefaction, avalanches, landslides, slumps, and rock slides. The Project does not propose and would not result in any activity that would cause or exacerbate conditions resulting in seismic waves. Therefore, the Project would result in no impact related to the exposure people or structures to potential substantial adverse effects, including by exacerbating the existing risk of loss, injury, or death involving strong seismic ground shaking or seismic-related ground failure.

Question a.iv) No Impact. The Project area has limited topographic relief, with elevation on site spanning a differential of approximately 20 feet. No landslide zones are mapped on the Project area by the California Geological Survey (CGS, 2008). Therefore, the potential for landslides on site, including a seismically-induced landslide, is considered low. For the reasons discussed above, the Project would result in no impact related to the exposure people or structures to potential substantial adverse effects, including by exacerbating the existing risk of loss, injury, or death involving landslides.

Question b) Less than Significant with Mitigation. Project construction would involve ground disturbance of up to 1,000 cubic yards of soil during on site grading, and some placement of on-site soils as fill. In a storm event, erosion could occur on-site, with sediment from the Project area becoming entrained in stormwater runoff from the site. This could result in a potential significant impact. However, the potential impact of erosion and loss of sediment from the site during construction would be reduced to a less-than-significant level with implementation of Mitigation Measure WQ-1, Stormwater Quality Protection Plan, as discussed in greater detail in the Hydrology and Water Quality analysis. The mitigation includes Best Management Practices that would reduce the opportunity and effects of erosion and topsoil loss, making this impact less than significant.



Question c) No Impact. Older (Quaternary), non-marine alluvial terrace deposits underlie the Project site. The potential impact from lateral spreading is low, because the site is relatively level. Settlement of the ground surface can be accelerated and accentuated by earthquakes. During an earthquake, settlement can occur as a result of the relatively rapid rearrangement, compaction, and settling of subsurface materials. Areas are susceptible to differential settlement if underlain by compressible sediments, such as poorly engineered artificial fill. As a result, settlement could occur, particularly with the presence of varying layers of artificial fill at the site from previous development. However, the Project does not propose and would not result in any activity that would affect the geologic unit underlying the site or cause soils to become unstable, potentially resulting in landslide, lateral spreading, subsidence, liquefaction, or collapse. Therefore, the Project would result in no impact related to unstable soil conditions or related ground failure.

Question d) No Impact. The clayey sand and gravel fills and the underlying clayey sand and gravel alluvial materials have been found in previous studies to have a moderate to high expansion potential. These materials could be subject to volume changes during seasonal fluctuations in moisture content. Adherence to standard engineering and construction techniques in accordance with the requirements of the California and Uniform Building Codes would minimize potential effects of expansive soils on site. Nonetheless, the Project would not create a new or exacerbate an existing substantial risk to life or property associated with its location on expansive soil because it does not propose and would not result in changes in water content that would cause the soil to swell or shrink. Therefore, no impact would occur.

Question e) No Impact. The Project would not utilize septic systems or other alternative disposal systems for the disposal of wastewater. Therefore, no impact would occur.


References California Department of Conservation, 2015. Fault Activity Map of California (2010).

http://maps.conservation.ca.gov/cgs/fam/ Accessed on May 12, 2017.

California Geological Survey, 2008. Earthquake Zones of Required Investigation, Livermore Quadrangle.

U.S. Geologic Survey, 2015. 6 Facts about Human-Caused Earthquakes. [https://www2.usgs.gov/blogs/features/usgs_top_story/6-facts-about-human-caused-earthquakes/] Accessed May 17, 2017.

http://maps.conservation.ca.gov/cgs/fam/

https://www2.usgs.gov/%E2%80%8Cblogs/features/usgs_top_story/6-facts-about-human-caused-earthquakes/

https://www2.usgs.gov/%E2%80%8Cblogs/features/usgs_top_story/6-facts-about-human-caused-earthquakes/



U.S. Geologic Survey, 2008. Forecasting California’s Earthquakes—What Can We Expect in the Next 30 Years? Prepared by Edward H. Field, Kevin R. Milner, and the 2007 Working Group on California Earthquake Probabilities, USGS Fact Sheet 2008-3027.

Templeton, Graham, 2015. Human Activity Is Causing Significantly More Earthquakes. Motherboard. [https://motherboard.vice.com/en_us/article/human-activity-is-causing-significantly-more-earthquakes] Accessed May 17, 2017.

https://motherboard.vice.com/en_us/article/human-activity-is-causing-significantly-more-earthquakes

https://motherboard.vice.com/en_us/article/human-activity-is-causing-significantly-more-earthquakes



Greenhouse Gas Emissions 3.2.7



Impact




Impact No Impact

7. GREENHOUSE GAS EMISSIONS — Would the project:

a) Generate greenhouse gas emissions, either directly or indirectly, that may have a significant impact on the environment?

☐ ☐ ☒ ☐

b) Conflict with an applicable plan, policy, or regulation adopted for the purpose of reducing the emissions of greenhouse gases?

☐ ☐ ☒ ☐

Discussion

Question a) Less than Significant. Based on the following analysis, construction and operation of the Project would not generate greenhouse gas (GHG) emissions, either directly or indirectly, that would have a significant impact on the environment.

Construction activities that would be associated with the Project would include site preparation; below ground work such as boring, trenching, and pipe installation; building construction and tank installation; system testing; and cleanup and restoration. Construction activities would occur over a period of approximately 22 months, between January 2018, and December 2019. The majority of the Project‐related GHG emissions would be generated on‐site due to the use of heavy‐duty off‐road equipment and a smaller amount of emissions would be generated off-site from trucks transporting equipment and material to the site.

For stationary source projects such as this Project, the 2011 Bay Area Air Quality Management District (BAAQMD) CEQA Guidelines recommend an operational significance threshold of 10,000 metric tons per year of CO2e (BAAQMD, 2011).2 Stationary-source projects include land uses that would accommodate processes and equipment that emit GHG emissions and would require a BAAQMD permit to operate. BAAQMD has not adopted significance thresholds for construction‐related GHGs; however, it requires that the lead agency disclose those emissions and make a determination of impacts in relation to meeting AB 32 reduction goals. For construction-related GHGs, other air districts (e.g., South Coast Air Quality Management District) have recommended that total emissions from construction be amortized over 30 years and added to operational emissions and then compared to the operations significance threshold (SCAQMD, 2008).

GHG emissions from construction activities were estimated using the CalEEMod emissions model with the same assumptions as discussed in the Air Quality analysis. The results of the

2 CO2e, or carbon dioxide equivalent, is a standard unit for measuring carbon footprints. The idea is to express the

impact of each different greenhouse gas component in terms of the amount of carbon dioxide (CO2) that would create the same amount of warming.



CalEEMod run indicate that the Project would generate a total of approximately 337 metric tons of CO2e over the 22-month project construction period. Amortized over an estimated Project life of 30 years, the annual GHG emissions from Project construction would be 11.2 metric tons of CO2e. Operational emissions from the testing and maintenance of the emergency standby generator would be minimal at 1.1 metric tons per year. The indirect emissions associated with the Project’s electricity use were estimated using Pacific Gas and Electric Company’s (PG&E) power grid emission factor for year 2019 (i.e., 0.0139 metric tons CO2 per megawatt per hour [MWh]; PG&E, 2015). Based on the 30 percent design for the Project (CDM Smith, 2017), it is estimated that the Project’s annual electricity demand would be approximately 4,824 MWh per year. This would equate to approximately 671 metric tons CO2 emissions per year. Refer to Appendix A for all assumptions used to estimate Project-related GHG emissions.

The sum of Project construction and operational GHG emissions would be approximately 1,019 metric tons per year, which would be well below the 10,000 metric tons per year significance threshold. Therefore, the Project would not generate GHG emissions that may have a significant impact on the environment. This impact would be less than significant.

Question b) Less than Significant. The Project would be located within an unincorporated area of Alameda County. The Alameda County Community Climate Action Plan (Plan) addresses reduction of GHG emissions within the unincorporated areas of Alameda County through a series of 37 local programs and 80 recommended policy measures related to transportation, land use, building energy, water, waste, and green infrastructure. The Plan, approved in February 2014, would enable the County to reduce its community-wide emissions by more than 15 percent by the year 2020 (Alameda County, 2014).

The Project’s emissions of CO2e represent a negligible amount when compared to the total annual GHG emissions generated for the entire County. Furthermore, the Project GHG emissions from construction would be a one-time occurrence and would not continually contribute to the County’s annual emissions, nor would it hinder the County’s progress towards its reduction targets. GHG emissions from the operation of the emergency backup generator would be minimal, as the generator would be routinely operated only for testing and maintenance for a maximum of 1 hour per day and 50 hours per year, and indirect emissions from electricity usage would be limited to approximately 671 metric tons CO2 emissions per year. Therefore, operational emissions would not result in the Project conflicting with an applicable plan, policy, or regulation adopted for the purpose of reducing GHG emissions. This impact would be less than significant.

With regard to consistency with the applicable air district plan, the BAAQMD’s 2017 Clean Air Plan (2017 CAP) contains 85 control measures aimed at reducing air pollution in the Bay Area. The 2017 CAP does not contain any measures specific to water treatment plants and, therefore, no inconsistency with the 2017 CAP is identified. Therefore, no associated impact has been identified.



References Alameda County, Community Climate Action Plan – An Element of the Alameda County

General Plan, February 4, 2014.

Bay area Air Quality Management District (BAAQMD), California Environmental Quality Act – Air Quality Guidelines, May 2011.

Pacific Gas and Electric Company (PG&E), 2015. Greenhouse Gas Emission Factors: Guidance for PG&E Customers, November 2015. Available online at: https://www.pge.com/includes/docs/pdfs/shared/environment/calculator/pge_ghg_emission_factor_info_sheet.pdf. Accessed June 22, 2017.

South Coast Air Quality Management District (SCAQMD), Interim CEQA GHG Significance Threshold for Stationary Sources, Rules and Plans, December 5, 2008.

https://www.pge.com/includes/%E2%80%8Cdocs/pdfs/shared/environment/calculator/pge_ghg_emission_factor_info_sheet.pdf

https://www.pge.com/includes/%E2%80%8Cdocs/pdfs/shared/environment/calculator/pge_ghg_emission_factor_info_sheet.pdf



Hazards and Hazardous Materials 3.2.8



Impact




Impact No Impact

8. HAZARDS AND HAZARDOUS MATERIALS — Would the project:

a) Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials?

☐ ☐ ☒ ☐

b) Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment?

☐ ☒ ☐ ☐

c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter mile of an existing or proposed school?

☐ ☐ ☐ ☒

d) Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment?

☐ ☐ ☐ ☒

e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard for people residing or working in the project area?

☐ ☐ ☐ ☒

f) For a project within the vicinity of a private airstrip, would the project result in a safety hazard for people residing or working in the project area?

☐ ☐ ☐ ☒

g) Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan?

☐ ☐ ☒ ☐

h) Expose people or structures to a significant risk of loss, injury, or death involving wildland fires, including where wildlands are adjacent to urbanized areas or where residences are intermixed with wildlands?

☐ ☒ ☐ ☐

Discussion

Question a) Less than Significant. Project construction would require the transportation, storage, use, and disposal of certain hazardous substances, such as, but not limited to, fuels, lubricants, degreasers, and oil routinely used during construction activities. Inadvertent release of these materials into the environment could adversely impact soil, surface water, or groundwater quality and potentially result in a significant hazard-related impact.

Construction activities must comply with numerous hazardous materials and stormwater regulations designed to ensure that hazardous materials are transported, used, stored, and disposed of in a safe manner to protect worker safety, and to reduce the potential for accidental releases of construction-related fuels or other hazardous materials that could affect stormwater and downstream receiving water bodies. For example, the California Health and Safety Code and the California Fire Code require contractors to develop and implement a Hazardous Materials



Management Plan for their activities that involve the use of hazardous materials. These requirements would ensure that hazardous materials used for construction would be stored in appropriate containers, with secondary containment to contain a potential release, and to have a spill response plan in place to respond to accidents. With these measures in place, potential impacts from construction-related hazardous materials would be less than significant.

As described in Chapter 2, Project Description, the Project would include an ozone generation room as part of the ozone generation building and the ozone contractor structure, both of which would be designated as hazardous spaces due to the presence of hazardous materials (e.g., ozone). To manage this, these spaces would be equipped with continuous ventilation. The horizontal tube ozone generators and ancillary components would be housed inside the ozone generation building, but would be contained to prevent hazardous releases. The liquid oxygen (LOX) and carbon dioxide storage facilities would include vertical storage tanks and cryogenic piping. The tanks would be contained and the piping would be insulated to prevent injury from contact with cryogenic piping. The carbon dioxide facility would include a vertical liquid carbon dioxide tank and ancillary components that would be housed on a concrete slab and with containment to prevent any hazardous releases. The Project would also include the use of a diesel-fueled generator providing back-up power for the new ozone system.

Operation and maintenance activities of the Project would not include routine transport or disposal of hazardous materials, nor would such activities create a significant hazard to the public or the environment; therefore, this impact would be less than significant.

Question b) Less than Significant with Mitigation. Project construction would involve ground excavation for the ozone contractor structure and some soil disturbance during grading of the Project area. The potential exists to encounter underground facilities such as sewer lines and for leaks in those structures to expose workers to hazardous materials.

A geotechnical investigation looking for the presence of total petroleum hydrocarbons in soil samples found at some DVWTP facilities did not show evidence of soil contamination (ESA, 2001). The potential to encounter hazardous materials in the subsurface during Project construction due to existing hazardous sites is considered to be low as discussed in Question d) below. However, if soil, groundwater, or other environmental medium with contamination is unexpectedly encountered during excavation or other construction activities, the Project could exacerbate the condition by exposing existing contaminants to the air (allowing volatilization), or to soil or water (enabling environmental or human exposure pathways that could increase the extent of the hazard. Implementation of Mitigation Measure HAZ-1, Unanticipated Soil or Groundwater Contamination, would reduce impacts related to unanticipated exacerbation of existing risks relating to hazardous materials to less than significant.

Though it can reasonably be assumed that Project construction planning would include avoidance of overhead electrical power lines, the movement of large construction equipment and vehicles could damage overhead utility lines and poles. Further, because there may be other underground utility lines (e.g., other water, sanitary sewer pipes and communication lines) in the Project



vicinity, Project construction could potentially result in disturbance to these lines as well. However, these potential impacts would be reduced to a less-than-significant impact with implementation of Mitigation Measure HAZ-2, Identify Underground Utilities.

Operation and maintenance activities would not include routine transport or disposal of hazardous materials and such activities would not create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment; therefore, this impact would be less than significant.

Question c) No Impact. No schools are located within 0.25 mile of the Project site. Therefore, no impact to schools would occur.

Question d) No Impact. The Project site is not included on any of the lists of hazardous materials sites maintained by the State Water Resources Control Board (SWRCB, 2017) or the Department of Toxic Substances Control (DTSC, 2017) that are compiled pursuant to Government Code Section 65962.5. Therefore, no impact would occur.

Question e) No Impact. The Project area is located approximately 5 miles from the Livermore Municipal Airport (also known as the Livermore Executive Airport). The Project is not within the boundaries of the Part 77 Airspace Protection Surfaces as defined in the Alameda County Airport Land Use Compatibility Plan for Livermore Executive Airport (Alameda County, 2012). Therefore, no impact would occur.

Question f) No Impact. The Project is not located within the vicinity of a private airstrip. The nearest private airstrip, Meadowlark Field Airport, is located approximately 5 miles from the Project area. Therefore, no impact would occur.

Question g) Less than Significant. The Project would not interfere with the designated agency responsibilities and reporting in the event of an emergency, because no roads would be completely closed, and construction and operational activities would occur within the existing DVWTP boundaries. As discussed in the Transportation and Traffic section of this Initial Study, traffic control to support transport and delivery of heavy equipment would be used. However, the carrying capacities of the roadways during this time would not be affected. Therefore, impacts related to impairment of, or interference with an adopted emergency response plan or evacuation plan would be less than significant.



Question h) Less than Significant with Mitigation. The California Department of Forestry and Fire Protection (CAL FIRE) maps wildland fire threats through the State of California through an index rating system based on the combination of potential fire behavior (Fuel Rank) and expected fire frequency (Fire Rotation). The Project area is subject to a moderate threat of fire (CAL FIRE, 2007).

Potential sources of ignition could include equipment with internal combustion engines and gasoline-powered tools. Smoking by onsite construction personnel would also be a potential source of ignition. If these or other Project activities sparked a wildland fire, a potential significant impact related to the risk of loss, injury, or death would result. This impact could be reduced to less than significant through the implementation of Mitigation Measure HAZ-3, Fire Safety Practices.

Facilities and equipment associated with the operation of the ozonation system would be contained and/or fitted with components to eliminate the potential for fire ignition. Operation of the Project would result in no impact associated with wildland fire-related risk.

Mitigation Measures With implementation of the following mitigation measures, potentially significant impacts attributable to unanticipated contamination, encountering underground utilities, and fire would be reduced to a less-than-significant level.

Mitigation Measure HAZ-1: Unanticipated Soil or Groundwater Contamination.

Zone 7 shall require the construction contractor to follow the procedures below in the event contaminated soil or groundwater is encountered (either visually, through odor detection, or another method) during construction:

• Stop work in the vicinity of the suspected materials;

• Secure the area of suspected contamination;

• Notify Zone 7 immediately, who shall then contact the appropriate regulatory agencies;

• Identify the nature and extent of contamination;

• Contain the areas of contamination;

• Perform appropriate clean up procedures (such as segregate, profile, and dispose of all contaminated soil). Required disposal method will depend on the type and concentration of contamination identified; and

• Any site investigation or remediation shall be performed in accordance with applicable regulations. Work shall not resume in the area(s) affected until the above measures have been implemented under the oversight of Zone 7 or regulatory agency, as appropriate.



Mitigation Measure HAZ-2: Identify Underground Utilities.

The contractor(s) shall identify underground utility lines such as natural gas, electricity, sewer, telephone, fuel, and water lines that may be encountered during excavation work. Information regarding the size, type, and location of existing utilities will be confirmed by the utility service provider or through potholing conducted by the contractor. A detailed engineering and construction plan that identifies construction methods and protective measures to minimize impacts on aboveground and belowground utilities shall be prepared. Construction shall be scheduled to minimize or avoid interruption of utility services to customers. The contractor(s) shall promptly reconnect any disconnected utility lines.

Mitigation Measure HAZ-3: Fire Safety Practices.

Zone 7 shall require the construction contractor to ensure that the following fire safety construction practices are implemented:

• Earthmoving and portable equipment with internal combustion engines shall be equipped with a sparks arrestor to reduce the potential for igniting a wildland fire;

• Appropriate fire suppression equipment shall be maintained at the construction site;

• Flammable materials shall be removed to a distance of 10 feet from any equipment that could produce a spark, fire, or flame; and

• Construction personnel shall be trained in fire safe work practices, use of fire suppression equipment, and procedures to follow in the event of a fire.

References Alameda County, 2012. Livermore Executive Airport – Airport Land Use Compatibility Plan.

August 2012.

California Department of Forestry and Fire Protection (CALFIRE), 2007. Fire Hazard Severity Zones in SRA, adopted by CAL FIRE on November 7, 2007.

California Department of Toxic Substances Control (DTSC), 2017. EnviroStor Database search, www.envirostor.dtsc.ca.gov/public, accessed May 9, 2017.

Environmental Science Associates (ESA), 2001. Zone 7 Del Valle Water Treatment Plant Solids Handling Facility (Draft), Initial Study and Draft Mitigated Negative Declaration. November, 2001.

State Water Resources Control Board (SWRCB), 2017. GeoTracker Database search, geotracker.waterboards.ca.gov, accessed May 9, 2017.

Zone 7 Water Agency, 2016, Draft Hazard Mitigation Plan, Available online http://www.zone7water.com/emergency-preparedness, accessed May 18, 2017.

http://www.envirostor.dtsc.ca.gov/public

http://www.zone7water.com/emergency-preparedness



Hydrology and Water Quality 3.2.9



Impact




Impact No Impact

9. HYDROLOGY AND WATER QUALITY — Would the project:

a) Violate any water quality standards or waste discharge requirements?

☐ ☒ ☐ ☐

b) Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)?

☐ ☐ ☐ ☒

c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off-site?

☐ ☒ ☐ ☐

d) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner that would result in flooding on- or off-site?

☐ ☒ ☐ ☐

e) Create or contribute runoff water that would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff?

☐ ☒ ☐ ☐

f) Otherwise substantially degrade water quality? ☐ ☒ ☐ ☐ g) Place housing within a 100-year flood hazard area as

mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map?

☐ ☐ ☐ ☒

h) Place within a 100-year flood hazard area structures that would impede or redirect flood flows?

☐ ☐ ☐ ☒

i) Expose people or structures to a significant risk of loss, injury or death involving flooding, including flooding as a result of the failure of a levee or dam?

☐ ☐ ☐ ☒

j) Inundation by seiche, tsunami, or mudflow? ☐ ☐ ☐ ☒

Discussion

Questions a), c), d), e), and f) Less than Significant with Mitigation. The nearest major water body to the DVWTP property is Arroyo Del Valle, located approximately 0.5- to 0.75 mile to the north of the DVWTP. This stream flows into Arroyo de la Laguna, which then flows into Alameda Creek and ultimately to the San Francisco Bay. The south tributary to Arroyo Del Valle is located approximately 600 feet to the west of, and approximately 50 feet lower in elevation relative to, the DVWTP. Stormwater from the DVWTP is currently collected by an onsite storm drain system. The collectors in the storm drain system converge on a 36-inch storm drain line that exits the property and discharges to the south tributary to Arroyo Del Valle approximately 700 feet west of the plant. A concrete outfall energy dissipating structure is at the end of the storm drain line to ensure creek bank



stability. Discharges to the south tributary to Arroyo Del Valle are currently permitted under a Municipal Regional Stormwater National Pollution Discharge Elimination System (NPDES) Permit under Order Number R2-2015-0049 NPDES No. CAS612008 (i.e., the Municipal Regional Stormwater Permit, or MRP). The federal Clean Water Act (CWA) was amended in 1987 to address urban stormwater runoff pollution to waters of the U.S. In 1990, the U.S. Environmental Protection Agency (EPA) established Phase 1 of the NPDES stormwater program as a means to control polluted discharges (SWRCB, 2015).

Site preparation for the Project would require grading up to approximately 1,000 cubic yards of native soil materials, as well as temporary soils storage associated with the trenching during installation of 600 feet of pipe. This could potentially result in erosion and siltation to the south tributary of Arroyo Del Valle via the storm drain system. In order to reduce or avoid potential discharges to surface waters during construction, Mitigation Measure WQ-1 would be implemented. Zone 7 would require the construction contractors to follow a Stormwater Pollution Prevention Plan (SWPPP) as part of a NPDES General Construction Activities Stormwater Permit for the Project to prevent the discharge of pollutants to stormwater runoff to the maximum extent practicable by implementing Best Management Practices (BMPs), including installation of silt barriers during construction to avoid erosion and discharge of silty runoff offsite. With implementation of a SWPPP, the Project would not violate water quality standards for construction activities, including sedimentation, entrainment and discharge of contaminants, and/or flooding. Potential impacts to water quality resulting from construction related discharges would be considered less than significant with the incorporation of Mitigation Measure WQ-1, Stormwater Pollution Prevention Plan.

The placement of up to 16,000 square feet of net new impervious surface area that would be for the ozonation facility would not be expected to result in a significant change to post-construction stormwater runoff at the 29-acre DVWTP facility, when compared to the plant area as a whole. The majority of storm water from this area would be channeled to an existing sludge drying basin for storage and evaporation. Therefore, the Project would not generate additional stormwater runoff that would leave the DVWTP property and would not lead to significant amounts of sediment or other contamination being transported off-site or cause flooding. Water utilized for hydro-testing of the new proposed ozonation system components would be recycled through the headworks of the treatment plant to confirm acceptable treatment process functionality in accordance with Zone 7 policy and applicable water quality mandates. With the incorporated mitigation, SWPPP, and BMPs potential impacts to water quality would be reduced to less-than-significant levels.

Question b) No Impact. No groundwater production or use is proposed as part of this Project. The placement of up to 16,000 square feet of net new impervious surface area that would be for the ozonation facility within the 29-acre DVWTP grounds would not substantially reduce the amount of ground surface to allow groundwater recharge. Groundwater within the vicinity of the DVWTP is more than 30 feet below the site. Therefore, no impacts to groundwater would occur.



Question g) No Impact. The Project is within the existing DVWTP facility and does not include housing. There would be no impact under this criterion.

Questions h) and i) No Impact. The Project site would be constructed within the existing DVWTP property fence line. The DVWTP property is not located within any mapped 100-year flood zone (FEMA, 2009). The Project site and DVWTP are located outside of the dam inundation zone of Del Valle Reservoir (ESA, 2001), which is the closest reservoir to DVWTP, located approximately 2.5 miles to the southeast. This Project would not expose people or structures to a significant risk of loss, injury or death as a result of flooding or dam failure. Therefore, no impact would occur.

Question j) No Impact. The Project site is located at over 650 feet elevation above mean sea level (msl) and is not located near water bodies that would experience seiches or tsunamis. At the crest of a knoll, the Project site in not within an area that would experience the effects of a mudflow. Therefore, no impact attributable to these circumstances would occur.

Mitigation Measures Implementation of the following mitigation measure would reduce potential hydrologic and water quality impacts to a less-than-significant level.

Mitigation Measure WQ-1: Stormwater Pollution Prevention Plan.

Zone 7 or its construction contractor shall prepare a site-specific SWPPP in accordance with the terms of the NPDES General Construction Activities Stormwater Permit (Order No. 0014-DWQ, NPDES No. CAS000002, or current version). It shall require the construction contractor to incorporate the SWPPP’s Best Management Practices (BMP) into all aspects of the Project. The BMPs shall include measures for management and operation of the construction site to control and minimize potential contribution of pollutants to stormwater runoff from these areas. These measures shall address site-specific methods for preventing and minimizing erosion and delivery of sedimentation through construction management practices to ensure control of potential water pollution sources.

Construction phase BMPs shall be in accordance with the NPDES General Construction Activities Stormwater Permit and shall include, but are not limited to:

• Pre-construction inspection by a qualified biologist to verify placement of storm water and erosion control devices sufficient to avoid off-site impacts.

• Dust control measures, as outlined under Mitigation Measure AQ-1, and as stated in the NPDES General Construction Activities Stormwater Permit, shall be conducted while minimizing excessive use of water, such that water is not permitted to pool or generate conditions leading to excessive delivery of sediments through runoff.



• Stabilize stockpiled soils by covering piles daily at the conclusion of grading activity, before/during rain events, or if they are unused for an extended period of time.

• Placement of (non-polymer) silt barriers, straw wattles, or other appropriate protective devices around inlets of all storm drains on site to minimize erosion and discharge of silty water or runoff, as determined by qualified stormwater quality practitioner (QSP).

• Maintenance of storm drain inlets, including dry sweeping and routine placement checks by Zone 7 personnel, or designated qualified monitor at the conclusion of the workday.

• Measures shall be taken on site to ensure that oils (as may be used in routine maintenance of construction equipment) are prevented from spilling or otherwise reaching surfaces that could result in eventual delivery to storm drains. The construction site shall be checked daily at the conclusion of the workday to ensure that fuels, oils and other potentially toxic substances are secured and not left on the grounds.

• Additional BMPs as determined by Zone 7 in order to maintain compliance with the terms of its NPDES (Municipal Regional Stormwater NPDES Permit, “MRP”) permit, or other regulatory requirement deemed applicable shall be incorporated into the SWPPP, as appropriate.

Post-construction phase BMPs shall be in accordance with the NPDES General Construction Activities Stormwater Permit and shall include, but are not limited to:

• The site shall be swept or otherwise cleared of all debris, including garbage and plastics daily and at the conclusion of the construction period.

• The site shall be inspected by Zone 7 personnel, or designated qualified monitor at the conclusion of the construction period to ensure correct placement of erosion control measures.

• Any additional BMPs, as determined by Zone 7 in order to maintain compliance with the terms of its NPDES (MRP) permit, or other regulatory requirement deemed applicable shall be incorporated into the SWPPP, as appropriate.

• The measures included in the SWPPP shall be monitored on a weekly basis, or greater as required by Permit, for effectiveness at limiting delivery of sediments or other toxic substances to the storm drains. If a measure is found to be ineffective, it shall be redesigned or replaced without delay.

References California State Water Resources Control Board San Francisco Bay Region, 2015, Municipal

Regional Stormwater Permit Order Number R2-2015-0049, available online at: http://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/stormwater/Municipal/index.shtml, accessed May 8, 2017.

http://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/stormwater/Municipal/index.shtml

http://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/stormwater/Municipal/index.shtml



ESA, 2001. Environmental Science Associates, November 2001, Zone 7 Del Valle Water Treatment Plant Solids Handling Facility (draft), Initial Study and Draft Mitigated Negative Declaration.

Federal Emergency Management Agency (FEMA) Flood Map Service Center, 2009, available online at: https://msc.fema.gov/portal/search?AddressQuery=901%20E%20Vineyard%20Rd.%20Livermore%2C%20CA#searchresultsanchor, accessed May 11, 2017.

https://msc.fema.gov/portal/search?AddressQuery=901%20E%20%E2%80%8CVineyard%20%E2%80%8CRd.%20Livermore%2C%20CA#searchresultsanchor

https://msc.fema.gov/portal/search?AddressQuery=901%20E%20%E2%80%8CVineyard%20%E2%80%8CRd.%20Livermore%2C%20CA#searchresultsanchor



Land Use and Land Use Planning 3.2.10



Impact




Impact No Impact

10. LAND USE AND LAND USE PLANNING — Would the project:

a) Physically divide an established community? ☐ ☐ ☐ ☒ b) Conflict with any applicable land use plan, policy, or

regulation of an agency with jurisdiction over the project (including, but not limited to the general plan, specific plan, local coastal program, or zoning ordinance) adopted for the purpose of avoiding or mitigating an environmental effect?

☐ ☐ ☐ ☒

c) Conflict with any applicable habitat conservation plan or natural community conservation plan?

☐ ☐ ☐ ☒

Discussion

Question a) No Impact. The Project would be constructed entirely within the DVWTP grounds and would not include any land use changes that would physically divide an established community. No special access through neighboring parcels is required for either construction or operation of the project that could potentially divide an established community. The Project is not intended to increase production, which could induce growth, construction and operation of the Project would not alter existing or neighboring land uses. Therefore, no impact would occur.

Question b) No Impact. The Project would be located within the existing DVWTP fence line in unincorporated area of Alameda County. Alameda County land use designation for the DVWTP per the Alameda County General Plan - East County Area Plan (ECAP) is “Major Public” (Alameda County 2002). Under the ECAP, “Major Public” provides for government-owned regional and sub-regional facilities such as, but not limited to, hospitals, jails, colleges, civic centers, and similar and compatible uses. As the Project would be located completely within the grounds of the DVWTP, it would not conflict with County policies encouraging the development of wineries in the South Livermore Valley or policies restricting projects that conflict with existing or proposed Livermore Area Recreation and Parks District (LARPD) trails. Thus, the Project is consistent with applicable Alameda County planning and zoning requirements. No impact would occur.

Question c) No Impact. Construction of the Project would occur entirely within the existing boundaries of the DVWTP and, as such, would not conflict with any applicable habitat conservation plan or natural community conservation plan, nor would the project conflict with any terms or conditions of the conservation easements on adjacent lands owned and managed by the LARPD (URS, 2014). No impact would occur.




References County of Alameda, 2000, East County Area Plan, Adopted May 2002, available online at:

http://www.acgov.org/cda/planning/generalplans/index.htm.

URS Corporation, 2014, Livermore Area Recreation and Park District, Sycamore Grove Park Extension Resource Management Plan, adopted April 30, 2014.

http://www.acgov.org/cda/planning/generalplans/index.htm



Mineral Resources 3.2.11



Impact




Impact No Impact

11. MINERAL RESOURCES — Would the project:

a) Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state?

☐ ☐ ☐ ☒

b) Result in the loss of availability of a locally-important mineral resource recovery site delineated on a local general plan, specific plan, or other land use plan?

☐ ☐ ☐ ☒

Discussion

Questions a) and b) No Impact. The DVWTP s i te is not located within an area classified as a mineral resource zone by the State Geologist (City of Livermore General Plan, 2013). Given that the DVWTP is also neither located in or near a mineral resource recovery site, nor is it located in an area of regional significance, no loss of availability of a known mineral resource would result for development of the Project (Livermore General Plan, 2013). Therefore, no impact to mineral resources would occur.


References City of Livermore, City of Livermore General Plan 2003-2025 Open Space and Conservation

Element, adopted February 2004, as amended 2013.



Noise 3.2.12



Impact




Impact No Impact

12. NOISE — Would the project result in:

a) Exposure of persons to or generation of, noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies?

☐ ☐ ☒ ☐

b) Exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels?

☐ ☐ ☒ ☐

c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project?

☐ ☐ ☒ ☐

d) A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project?

☐ ☐ ☒ ☐

e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels?

☐ ☐ ☐ ☒

f) For a project located in the vicinity of a private airstrip, would the project expose people residing or working in the project area to excessive noise levels?

☐ ☐ ☐ ☒

Discussion

Question a) Less than Significant. The Project would be located in an unincorporated area of Alameda County south of the City of Livermore. The nearest residence is located over 800 feet west of the Project site and a trail associated with Sycamore Grove Park is located approximately 450 feet to the east of the site. Pursuant to Alameda County General Plan Policy 290, the County requires new development projects to incorporate mitigation if the project would result in a day-night noise level (DNL) that would exceed 60 A-weighted decibels (dBA) at a residential property line (Alameda County, 2002). This noise level is applicable to long-term sources of noise, such as those that would be associated with operation of the Project. The Alameda County Noise Ordinance limits construction activities to the hours of 7:00 AM to 7:00 PM on weekdays and 8:00 AM to 5:00 PM on weekends. (Weekend work would be conducted only with approval from the Zone 7 Board of Directors.)

As discussed further under Question c), operations of the Project would not include any major sources of noise. The only new noise source would be a generator that would be routinely operated only for testing a maximum of 1 hour per day, which would not be expected to increase the DNLs at the nearest sensitive receptor locations, and would be considered acceptable in terms of state’s compatibility recommendations. With regard to construction, these short-term activities would only take place during the least‐noise sensitive daytime hours between 7:00 AM and 7:00 PM on weekdays and 8:00 AM to 5:00 PM on weekends, which would be consistent with the Alameda County Noise Ordinance.



Therefore, the Project would not generate a substantial increase in noise levels in excess of standards established in the local general plan or noise ordinance. This would be a less-than-significant impact.

Question b) Less than Significant. Vibration can be interpreted as energy transmitted as waves through the ground. These energy waves generally dissipate with distance from the vibration source. Since energy is lost during the transfer of energy from one particle to another, vibration attenuates rapidly with distance. Operations and maintenance of the project would not include any sources of vibration that would be considered excessive. Groundborne vibration and noise associated with some construction activities, including the use of pile drivers, bore rigs, and jack hammers can cause excessive vibration. The Project would not include any such activities. Ground borne vibration and noise levels generated by equipment required to construct the Project would be minimal and would not be perceptible beyond a distance of 25 feet from the source (FTA, 2006). No existing structures are located close enough to the Project site such that any damage related to groundborne vibration from construction activities would occur. The nearest residence is located approximately 800 feet west of the DVWTP fence line and a Sycamore Grove Park trail is located approximately 450 feet east of the fence line. At these distances, groundborne vibration and noise levels from project construction equipment would not be noticeable. This would be a less-than-significant impact.

Question c) Less than Significant. Once operational, the Project would not include any major sources of noise. Any noise from project mechanical and electrical equipment would be minimal and all equipment would be housed within the ozone generation building, which would provide further attenuation. The project includes a new standby power generator that would provide back-up power for the new ozone system. The generator would be routinely operated only for testing for a maximum of 1 hour per day and 50 hours per year, and would be an intermittent noise source. Generators tend to emit noise levels of up to 81 dBA at a distance of 50 feet (FTA, 2006); however, the proposed generator would be enclosed within a weather/noise enclosure that would attenuate the generator noise by at least 20 dBA. Noise from stationary sources generally attenuates at a rate of 6.0 to 7.5 dBA per doubling of distance (Caltrans, 1998). At a distance of 800 feet to the closest residence, the enclosed generator would be expected to result in periodic noise levels between 31 and 37 dBA. At a distance of 450 feet to the closest recreational trail, the generator would be expected to result in periodic noise levels between 37 and 42 dBA. Given these relatively low noise levels, and because routine operations of the generator would occur for no more than 1 hour per day, this source of noise would not result in an increase in the DNL at the nearest sensitive receptor locations. Therefore, noise from project operations would not cause a substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the Project. This impact would be less than significant.



Question d) Less than Significant. Construction noise levels at and near the Project site would fluctuate depending on the type, number, and duration of use of various pieces of construction equipment. Given the low level of construction-related vehicle trips associated with hauling and commuting workers (estimated to be less than an average of 20 trips per day), these trips would not be expected to raise ambient noise levels along haul routes. Table 3.3 shows typical noise levels produced by various types of construction equipment that would operate at the Project site.

TABLE 3.3 NOISE LEVELS FROM TYPICAL CONSTRUCTION EQUIPMENT

Construction Equipment Noise Exposure Level,

dB Lmax @ 50 Feet

Backhoe 78

Compactor 83

Concrete Mixer Truck 79

Concrete Pump Truck 81

Concrete Pump 82

Crane 81

Drill rig truck 79

Excavator 81

Front End Loader 79

Grader 85

Paver 77

Roller 80

Trencher 80

Pickup Truck 75

SOURCE: Federal Highway Administration (FHWA), 2006. Construction Noise Handbook, August 2006. (Chapter 9)

Noise impacts from construction generally result when construction activities occur during the noise-sensitive times of the day (early morning, evening, or nighttime hours), in areas immediately adjacent to sensitive receptors, or when construction noise lasts for extended periods of time. Noise generated from the noisiest construction equipment (i.e., a grader at 85 dBA) would attenuate to between approximately 55 and 61 dBA at the closest residence location, and between approximately 61 and 66 dBA at the closest recreational trail location.

Although there are no applicable local policies or standards available to judge the significance of short-term daytime construction noise levels, the Federal Transit Administration (FTA) has identified a daytime 1-hour Leq level of 90 dBA as a noise level where adverse community reaction could occur at residential land uses (FTA, 2006). This noise level is used here to assess whether construction-related noise levels would cause a substantial temporary or periodic increase in ambient noise levels at sensitive receptor locations. Although Project-related construction noise levels may be audible at the nearest sensitive receptor locations, they would



not exceed the 90 dBA Leq threshold, and therefore would not result in a significant impact. The temporary increase in ambient noise levels would cause a less-than-significant impact.

Question e) No Impact. The Project area is located approximately 5 miles from the Livermore Municipal Airport and is not within an airport land use plan. Therefore, the Project would not expose people residing or working in the Project area to excessive noise levels. No impact would occur.

Question f) No Impact. The Project is not located within the vicinity of a private airstrip. The nearest private airstrip, Meadowlark Field Airport, is located approximately 5 miles from the Project area and would not influence the noise environment at the Project site. Therefore, no impact would occur.


References Alameda County Community Development Agency, East County Area Plan – Volume 1: Goals,

Policies and Programs, last amended in May 2002.

California Department of Transportation (Caltrans), Traffic Noise Analysis Protocol - For New Highway Construction and Highway Reconstruction Projects, October 1998.

Federal Highway Administration (FHWA), Construction Noise Handbook, August 2006. (Chapter 9)

Federal Transit Administration, Transit Noise and Vibration Impact Assessment, May 2006.



Population and Housing 3.2.13



Impact




Impact No Impact

13. POPULATION AND HOUSING — Would the project:

a) Induce substantial population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)?

☐ ☐ ☐ ☒

b) Displace substantial numbers of existing housing, necessitating the construction of replacement housing elsewhere?

☐ ☐ ☐ ☒

c) Displace substantial numbers of people, necessitating the construction of replacement housing elsewhere?

☐ ☐ ☐ ☒

Discussion

Questions a), b), and c) No Impact. The Project is intended to improve existing water treatment infrastructure to improve water quality, not to increase overall water treatment capacity. Furthermore, the Project would be constructed within the existing property line of the DVWTP. It does not involve demolition of existing housing or require the construction of homes elsewhere. The Project would not displace any existing housing or people. Therefore, no impact would occur.




Public Services 3.2.14



Impact




Impact No Impact

14. PUBLIC SERVICES — Would the project:

a) Result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered government facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times, or other performance objectives for any of the following public services:

i) Fire protection? ☐ ☐ ☐ ☒ ii) Police protection? ☐ ☐ ☐ ☒ iii) Schools? ☐ ☐ ☐ ☒ iv) Parks? ☐ ☐ ☐ ☒ v) Other public facilities? ☐ ☐ ☐ ☒

Discussion

Questions a.i-v) No Impact. There would be no increase in the existing DVWTP staff levels, nor any increase in the treated water service capacity levels provided by Zone 7 as a result of the Project. The intent of the project is to improve water quality at the existing level of supply. Therefore, no demand increases are expected for public services that support new residents, schools, utilities, parks, fire or police protection through expanded facilities at DVWTP or induced growth. In addition, the Project would be developed within the fenced and secured location; there would not be a significant increase in the demand for police and fire protection onsite. The Project would not alter or create a need for any additional public facilities; therefore no impact would occur relative to public services.




Recreation 3.2.15



Impact




Impact No Impact

15. RECREATION:

a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated?

☐ ☐ ☐ ☒

b) Does the project include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical effect on the environment?

☐ ☐ ☐ ☒

Discussion

Question a) No Impact. The Project would not increase the use of existing parks or other recreational resources and facilities because the treated water service capacity levels provided by Zone 7 would not increase as a result, thereby encouraging growth which would increase the use of recreational facilities and opportunities over existing levels. The DVWTP is located immediately adjacent to the 847-acre Sycamore Grove Park owned and managed by the Livermore Area Recreation and Park District offering nature trails, a reservable picnic area, and numerous other public recreational opportunities to area residents and visitors (LARPD, 2017). No impact would occur under this criterion.

Question b) No Impact. The Project does not include any development of parks or other recreational facilities nor would it require construction of new or expansion of existing recreational facilities, as the intent of the Project is to provide improved water quality to existing supplies, rather than increase those supplies. There would be no impact under this criterion.


References Livermore Area Recreation and Park District (LARPD), 2017. Sycamore Grove Park Quick

Facts, available online at: http://www.larpd.org/open_space/sycamore.html.

http://www.larpd.org/open_space/sycamore.html



Transportation and Traffic 3.2.16



Impact




Impact No Impact

16. TRANSPORTATION/TRAFFIC — Would the project:

a) Conflict with an applicable plan, ordinance or policy establishing measures of effectiveness for the performance of the circulation system, taking into account all modes of transportation including mass transit and non-motorized travel and relevant components of the circulation system, including but not limited to intersections, streets, highways and freeways, pedestrian and bicycle paths, and mass transit?

☐ ☐ ☒ ☐

b) Conflict with an applicable congestion management program, including, but not limited to level of service standards and travel demand measures, or other standards established by the county congestion management agency for designated roads or highways?

☐ ☐ ☐ ☒

c) Result in a change in air traffic patterns, including either an increase in traffic levels or a change in location that results in substantial safety risks?

☐ ☐ ☐ ☒

d) Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)?

☐ ☐ ☒ ☐

e) Result in inadequate emergency access? ☐ ☐ ☒ ☐ f) Conflict with adopted policies, plans, or programs

regarding public transit, bicycle, or pedestrian facilities, or otherwise decrease the performance or safety of such facilities?

☐ ☐ ☒ ☐

Discussion

Question a) Less than Significant. Construction of the Project would temporarily increase local traffic due to the transport and delivery of construction equipment and materials, as well as from daily worker trips. Regional access to the Project work sites would occur from I-580, with local access occurring via various roads, including Isabel Avenue, State Route 84, East Vineyard Avenue, and the DVWTP access road.

Direct traffic impacts, such as local congestion and disruption of traffic flow from construction of the project would be short-term and temporary. All construction activities would be limited to weekdays during the hours of 7:00 AM to 7:00 PM, with weekend work during the hours of 8:00 AM to 5:00 PM [occurring only with Zone 7 Board approval]. Construction activities that would generate offsite traffic would include the delivery of construction vehicles and equipment to the Project site, the daily arrival and departure of construction workers, and the delivery of materials throughout the construction period.



The estimated truck traffic would vary depending on the construction activity, with an estimated maximum of about 4 trucks (8 one-way truck trips) per day3, which would yield a small number of truck trips spread over the course of the work day. The number of construction personnel likewise would vary depending on the construction activity, but a typical crew size is estimated to vary between 5 and 15 workers per day, generating up to about 38 one-way vehicle trips per day (30 commute trips plus 8 midday trips [e.g., for lunch]). The total daily trip generation (trucks plus workers) would be up to about 46 one-way vehicle trips.

The East County Area Plan (Alameda County 2002) Policy 193 states that the traffic level-of-service (LOS) on intercity arterial roads shall not exceed LOS D or LOS E on I-580. Construction-generated traffic increases would be temporary and vary with the construction phase. Therefore, it would not result in any long-term degradation (i.e., LOS D) in operating conditions on local roadways used for the project, although drivers could experience delay if they were traveling behind a heavy truck. The impact from relatively low Project-generated traffic volume during construction would be less than significant.

Once the Project is in operation, the number of employee trips is anticipated to return to pre-Project levels. Materials delivery would constitute up to two additional trips per month, which would not be a substantial increase in traffic volumes attributable to the project. This impact would be less than significant.

Question b) No Impact. Congestion management programs (and LOS standards established by congestion management agencies and defined above) are intended to monitor and address long-term traffic conditions related to future development that generate permanent (on-going) traffic increases, and do not apply to temporary impacts associated with construction projects. Updated every two years, Alameda County’s Congestion Management Program (CMP) aligns with the long-range Countywide Transportation Plan, the 2013 Regional Transportation Plan and Sustainable Communities Strategy, and other related efforts and legislative requirements.

Project construction would be transitory in nature and effects on roadway and intersection operations would be temporary. Following construction, traffic increases associated with Project operation and maintenance would be limited to up to two per month. The Project would be operated and maintained by existing DVWTP staff and would not require additional workers. Thus, there would not be a substantial increase in vehicle trips resulting from the project. For these reasons, there would be no impact related to conflicts with the County’s Congestion Management Program.

Question c) No Impact. The nearest airport (Livermore Municipal Airport) is located approximately 5 miles from the Project site. Project construction would not change air traffic patterns. In addition, the 3 During the 20-month construction period, 460-540 truck deliveries to the DVWTP would occur. Truck trips are

assumed to generate upwards of 4 trucks (8 one-way truck trips) on any given day.

http://www.alamedactc.org/app_pages/view/5224

http://www.alamedactc.org/app_pages/view/795

http://www.mtc.ca.gov/planning/plan_bay_area/

http://www.mtc.ca.gov/planning/plan_bay_area/



Project would not involve the installation of structures that could interfere with air space. No impacts would occur.

Question d) Less than Significant. The Project would not introduce any new intersections or adjusted roadway geometry that would have the potential to introduce a hazardous driving condition. Additionally, as noted above, the Project would not introduce a substantial number of large construction or delivery vehicles to area roadways during the construction phase. Therefore, potential hazards associated with such conditions would be less than significant.

Question e) Less than Significant. The Project would not change the configuration of the Project area’s road network, and would not require temporary lane closures which would create reduced traffic capacity issues. As described in Question a) above, construction would cause a less-than-significant increase in congestion on area roadways, though slow-moving construction-related vehicles could temporarily interfere with emergency response to the work site (e.g., emergency service vehicles traveling behind the slow-moving truck). However, all vehicles are required by law to yield to responding emergency vehicles which have warning apparatus in operation, it is not considered likely that heavy construction-related traffic would result in inadequate emergency access. Adherence to existing traffic rules-of-the-road would ensure that the Project’s construction impacts to emergency access would be less than significant.

Question f) Less than Significant. The Project would neither directly nor indirectly eliminate existing or planned alternative transportation corridors or facilities (e.g., bike paths, lanes, etc.), including changes in policies or programs that support alternative transportation, nor construct facilities in locations for which future alternative transportation facilities may be planned. The Project would not conflict with the policies set forth in the East County Area Plan supporting alternative transportation (Alameda County, 2002). As described in Question a) above, construction activities associated with the Project would not generate traffic volume increases that would significantly affect traffic flow on area roadways. The performance of public transit, bicycle and pedestrian facilities in the area likewise would not be adversely affected, and the project impact would be less than significant.


References Alameda County Community Development Agency, East County Area Plan – Volume 1: Goals,

Policies and Programs, last amended in May 2002.



Tribal Cultural Resources 3.2.17



Impact




Impact No Impact

17. Tribal Cultural Resources — Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is:

a) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k), or

☐ ☒ ☐ ☐

b) A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1. In applying the criteria set forth in subdivision (c) of Public Resources Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe.

☐ ☒ ☐ ☐

Discussion Tribal cultural resources are: 1) sites, features, places, cultural landscapes, sacred places, and objects with cultural value to a California Native American tribe that are listed, or determined to be eligible for listing in the California Register of Historical Resources (California Register), or local register of historical resources, as defined in Public Resources Code Section 5020.1(k); or, 2) a resource determined by the CEQA lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in Public Resources Code Section 5024.1(c). For a cultural landscape to be considered a tribal cultural resource, it must be geographically defined in terms of the size and scope of the landscape (Pub. Res. Code §21074[b]). Also, an historical resource, as defined in Public Resources Code Section 21084.1, unique archaeological resource, as defined in Public Resources Code Section 21083.2(g), or non-unique archaeological resource, as defined in Public Resources Code Section 21083.2(h), may also be a tribal cultural resource.

ESA sent a Sacred Lands File search request to the Native American Heritage Commission (NAHC) on April 5, 2017. ESA received a response from the NAHC on April 12, 2017. The NAHC recommended that agencies should provide information regarding any cultural resources assessment completed for the project to date, including the results of the Sacred Lands File search request; the NAHC search of the Sacred Lands File produced negative results. On April 24, 2017, Zone 7 sent written notice of the Project to Native American tribal organizations listed by the NAHC which could have a historic and cultural interested in the area, as required by Public Resources Code Sections 21080.3.1 and 21080.3.2. As of the release of this document from public and agency review, no response from these tribal organizations has been received.

ESA completed a records search at the Northwest Information Center (NWIC) of the California Historical Resources Information System on March 23, 2017 (File No. 16-1448). The purpose of the records search was to (1) determine whether known cultural resources have been recorded



within or adjacent to the project area; (2) assess the likelihood for unrecorded cultural resources to be present based on historical references and the distribution of nearby sites; and (3) develop a context for the identification and preliminary evaluation of cultural resources.

Results of the records search indicate that ten (10) cultural resources have been identified within the 0.5-mile records search radius. None of these resources are recorded within the Project area. These resources consist of historic-era remnants of homesteads and agricultural activities. No prehistoric archaeological resources are within the 0.5-mile records search radius. The nearest known prehistoric resources are over 2.5 miles to the north and 4 miles to the south of the Project area.

The Project is located in older (quaternary), non-marine alluvial terrace deposits, or alluvial fan. This geologic formation has a very low potential to contain buried archaeological resources. Archaeological resources within this geologic context would be at or very near to the surface and would be identifiable during a pedestrian surface survey; no cultural resources were identified during the surface survey of the project area completed by a Registered Professional Archaeologist on April 6, 2017.

Question a) Less than Significant with Mitigation. Based on the results of correspondence with the NAHC and the NWIC records search, no known tribal cultural resources listed or determined eligible for listing in the California Register, or included in a local register of historical resources as defined in Public Resources Code Section 5020.1(k), pursuant to Public Resources Code Section 21074(a)(1), would be impacted by the project.

However, if any previously unrecorded archaeological resource were identified during ground-disturbing construction activities and were found to qualify as a tribal cultural resource pursuant to Public Resources Code Section 21074(a)(1) (determined to be eligible for listing in the California Register or in a local register of historical resources), any impacts to the resource resulting from the project could be potentially significant. Any such potential significant impacts would be reduced to a less than significant level by implementing Mitigation Measure CUL-1, Accidental Discovery of Archaeological Resources (refer to Section 3.2.5, Cultural Resources, in this Initial Study).

Question b) Less than Significant with Mitigation. Based on the results of correspondence with the NAHC and the NWIC records search, Zone 7 did not determine any resource that could potentially be affected by the Project to be a tribal cultural resource significant pursuant to criteria set forth in Public Resources Code Section 5024.1(c). Therefore, the project is not anticipated to impact any such resources.

However, if any previously unrecorded archaeological resource were identified during Project implementation, particularly ground-disturbing construction activities, and were found to qualify as a tribal cultural resource pursuant to Public Resources Code Section 21074(a)(2) (determined by the



lead agency to be significant pursuant to criteria set forth in Public Resources Code Section 5024.1[c]), any impacts to the resource resulting from the Project could be potentially significant. Any such potential significant impacts would be reduced to a less than significant level by implementing Mitigation Measure CUL-1, Accidental Discovery of Archaeological Resources (refer to Section 3.2.5, Cultural Resources, in this Initial Study).

Mitigation Measures Implementation of Mitigation Measure CUL-1, presented in the Cultural Resources analysis in this Initial Study, would reduce these potential impacts to a less-than-significant level.

References Northwest Information Center (NWIC), File No. 16-1448. California Historical Resources

Information System at Sonoma State University, Rohnert Park. On file at ESA, March 23, 2017.



Utilities and Service Systems 3.2.18



Impact




Impact No Impact

18. UTILITIES AND SERVICE SYSTEMS — Would the project:

a) Exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board?

☐ ☐ ☐ ☒

b) Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects?

☐ ☐ ☐ ☒

c) Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects?

☐ ☐ ☒ ☐

d) Have sufficient water supplies available to serve the project from existing entitlements and resources, or are new or expanded entitlements needed?

☐ ☐ ☒ ☐

e) Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments?

☐ ☐ ☐ ☒

f) Be served by a landfill with sufficient permitted capacity to accommodate the project’s solid waste disposal needs?

☐ ☐ ☒ ☐

g) Comply with federal, state, and local statutes and regulations related to solid waste?

☐ ☐ ☒ ☐

Discussion

Question a) No Impact. By the nature of the ozonation process, the Project would not generate wastewater. Therefore, the project would not interfere with or conflict with any applicable Regional Water Quality Control Board requirements for wastewater treatment. For a discussion of stormwater discharges and water quality associated with Project construction, please refer to the Hydrology and Water Quality section of this Initial Study. There would be no impact with regard to wastewater treatment requirements.

Question b) No Impact. The intent of the Project would be to enhance the quality of existing potable water treatment capabilities. It would not increase the plant’s water treatment capacity, which would encourage further growth in the service area that would require expansion or construction of additional water and wastewater treatment facilities. Therefore, no impact would occur.

Question c) Less than Significant. The Project would add approximately 16,000 net square feet of impervious surface within the 29-acre DVWTP site. Stormwater drainage from this area would be directed to



the existing sludge drying basin immediately south of the Project site for storage and introduction into the DVWTP treatment system to be included in the plant’s recycled water stream. As the increase is negligible when compared to the DVWTP site as a whole, and as stormwater discharge from the Project site would remain onsite, the project’s impact to stormwater drainage facilities would be less than significant.

Question d) Less than Significant. The Project would require limited water during construction in support of dust suppression. Some water would be required during operations (e.g., up to 410 GPM from internal sources to serve open-loop and closed-loop cooling water equipment). However, existing water supplies at the DVWTP would be sufficient to enable construction and operation of the Project without requiring any new or expanded entitlements, or other new sources of water supply. This impact would be less than significant.

Question e) No Impact. The Project would not generate wastewater, nor would it expand water supply such to induce development as a result. Therefore, the area’s wastewater treatment provider would not require additional wastewater treatment capacity in order to serve the Project. No impact would occur.

Question f) Less than Significant. During construction, the Project would generate minimal construction-related waste and debris, as no demolition would be required. Construction-related wastes would include minimal amounts of metals, concrete, plastics, etc. Waste and byproducts resulting from the ozonation process would be handled pursuant to all applicable federal, state, and local laws and regulations.

To the extent feasible, recyclable construction materials would be recycled. Non-recyclable materials would be landfilled or otherwise disposed of in accordance with applicable regulatory requirements. The Project would utilize either the Vasco Road Sanitary or Altamont landfills north and northeast of Livermore to dispose of construction-related solid wastes from the project, while recycling would rely on a local franchised recycler. Given that either landfill has at least another five years and 8 million cubic yards of permitted available landfill capacity (CalRecycle, 2017), and that the Project would generate a relatively limited volume of solid waste, available landfill capacity would not be substantially affected by the Project.

As part of ongoing Project maintenance, some waste would be generated from the clean out of the ozone contactor drains and related building wash water. This material would be directed to existing sludge drying beds and disposed of according to regulatory requirements, as is currently the case with sludge disposal. Any brine would be directed to the wash water recovery ponds on site. Given the recycling/reuse opportunities, available landfill capacity, and adherence to existing practice and regulations, this impact is considered less than significant.



Question g) Less than Significant. Project construction and operation would comply with all applicable regulatory requirements related to solid waste. Specifications for Project construction would contain requirements for the handling, storage, cleanup, and disposal of any hazardous materials, cement, or other construction pollutants. For additional discussion of hazardous materials and potentially hazardous materials handling and impacts, please refer to the Hazards and Hazardous Materials analysis in this Initial Study. This impact is considered less than significant.


References CalRecycle, 2017. Facility/Site Summary Details: Altamont Landfill & Resource Recv’ry (01-AA-

0009). http://www.calrecycle.ca.gov/SWFacilities/Directory/01-AA-0009/Detail/ Accessed May 12.

CalRecycle, 2017. Facility/Site Summary Details: Vasco Road Sanitary Landfill (01-AA-0010). http://www.calrecycle.ca.gov/SWFacilities/Directory/01-AA-0010/Detail/ Accessed May 12.

http://www.calrecycle.ca.gov/SWFacilities/Directory/01-AA-0009/Detail/

http://www.calrecycle.ca.gov/SWFacilities/Directory/01-AA-0010/Detail/



Mandatory Findings of Significance 3.2.19



Impact




Impact No Impact

19. MANDATORY FINDINGS OF SIGNIFICANCE —

a) Does the project have the potential to degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory?

☐ ☒ ☐ ☐

b) Does the project have impacts that are individually limited but cumulatively considerable? (“Cumulatively considerable” means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)?

☐ ☐ ☒ ☐

c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly?

☐ ☒ ☐ ☐

Discussion

Questions a) and c) Less than Significant with Mitigation. The analysis presented in this Initial Study has identified a number of potentially significant environmental impacts attributable to the Project. To ameliorate these impacts, a number of mitigation measures are proposed that will be included in the Project’s Mitigation Monitoring and Reporting Program upon adoption of this Mitigated Negative Declaration and approval of the Project. As required by CEQA, these mitigation measures are required to be implemented as directed herein. With implementation of the mitigation measures presented herein, the Project does not have the potential to degrade the quality of the environment, including fish or wildlife species or their habitat, plant or animal communities, important examples of the major periods of California history or prehistory, or adverse effects on human beings. As a result, these impacts would be less than significant.

Question b) Less than Significant. Consideration of past, present, and reasonably foreseeable projects in the Project area and vicinity indicate that the proposed Zone 7 Del Valle Water Treatment Plant Ozonation Project would have a less than significant cumulative impact. In the Project vicinity, the closest project proposed includes a winery complex at 203 Vallecitos Road approximately 0.25 mile west of East Vineyard Road (i.e., the access to DVWTP). This project is currently under review by the City of Livermore. There are three active construction projects on Discovery Drive and Challenger Street in Livermore which are accessed from SR 84, which would be the primary access route from I-580 to the project site. There are three additional projects on Airway Boulevard, West Jack London Boulevard and Terminal Circle currently under City review which



would also use this section of SR 84 as access. These projects are primarily for industrial/ distribution facilities and highway commercial closer to I-580. Given the low number of anticipate construction-related trips for the Ozonation Project (approximately 46 one-way trips per day) and the limited distance on SR 84 that would be affected (i.e., I-580 to Discovery Drive, approximately 1.0 mile), the project’s impact to traffic in this area of the city would not be cumulatively considerable.

The California Water Company currently has three projects under construction or review in the City. These consist of a new pump station building, new chloramination building, and replacement of an existing 50,000-gallon storage tank. None of these projects would require additional service from DVWTP in excess of that currently provided. In fact, the Ozonation Project would improve the quality of potable water provided to this retail water provider. There are no other present or reasonably foreseeable projects within the boundary of the DVWTP.

The State Route 84 Expressway (Isabel Avenue) Widening project is currently under construction. This project will rehabilitate SR 84 as a regional connector between I-580 and I-680. At the time of this analysis, the Project’s primary construction activities were between Concannon Boulevard and Ruby Hill Drive, widening the roadway from two lanes to four lanes. Also as part of the road widening project, the western portion of Vallecitos Road at SR 84 was closed for realignment, with traffic being detoured to East Vineyard Avenue, an access road to DVWTP. The Isabel Avenue Widening project is estimated to be completed in the spring of 2018. The early stages of the Ozonation Project, as currently scheduled, would overlap the SR 84 project schedule by up to four months. Given this short timeframe, the Project’s contribution to construction-related issues on SR 84 would not be cumulatively considerable.

The Project would not have impacts to agriculture or forestry resources, land use and planning, mineral resources, population and housing, public services, or recreation that would combine with other projects. The proposed activities could have impacts with respect to aesthetics, biological and cultural resources, geology, and hazards and hazardous materials, hydrology and water quality, transportation and traffic, tribal cultural resources, and utilities and service systems. However, such impacts would be limited to the Project site and, where necessary, mitigated such that they would not substantially combine with other off-site impacts.

However, the Project’s potential impacts with respect to air quality and GHG emissions could extend beyond the site to combine with impacts from other projects. As described in Sections 3.2.3 and 3.2.7 (Air Quality and Greenhouse Gas Emissions, respectively), BAAQMD considered the emission levels at which a project’s individual emissions would be cumulatively considerable in developing its CEQA significance thresholds. BAAQMD considers projects that result in emissions that exceed its CEQA significance thresholds to result in individual impacts that are cumulatively considerable and significant. As discussed in these sections, the Project’s emissions would be limited to the construction period and would be below BAAQMD’s cumulatively considerable threshold.

For the reasons presented above, the Project would not be expected to result in adverse impacts to human beings, either directly or indirectly. All impacts identified in this document would be less



than significant, or brought to less-than-significant levels with implementation of mitigation measures. Accordingly, the Project’s incremental contribution to potential cumulative impacts would not be cumulatively considerable. Therefore, the Project’s cumulative impact would be considered less than significant.

Mitigation Measures The following mitigation measures will be implemented to ensure that the Project would not have a cumulative effect on the environment when considered together with other projects. The full text of these measures is found in the respective resource analysis in this Initial Study.

Mitigation Measure AQ-1: Implement BAAQMD Basic Construction Mitigation Measures

Mitigation Measure BIO-1: Exclusion Fencing

Mitigation Measure BIO-2: Pre-Construction Bird Surveys

Mitigation Measure CUL-1: Accidental Discovery of Archaeological Resources

Mitigation Measure CUL-2: Accidental Discovery of Paleontological Resources

Mitigation Measure CUL-3: Accidental Discovery of Human Remains

Mitigation Measure HAZ-1: Unanticipated Soil or Groundwater Contamination

Mitigation Measure HAZ-2: Identify Underground Utilities

Mitigation Measure HAZ-3: Fire Safety Practices

Mitigation Measure WQ-1: Stormwater Pollution Prevention Plan

References California Department of Transportation (Caltrans), Undated. State Route 84 Expressway

Widening (pamphlet).

Livermore, City of, Community and Economic Development Department, 2017. Summary of Major Development Projects. May 9.


CHAPTER 4 Report Preparers

4.1 Report Authors

4.1.1 Lead Agency Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA 94551

Tami Church Zone 7 Integrated Planning

4.1.2 Consultants Prime Consultant Environmental Science Associates (ESA) 1425 North McDowell Blvd. Ste. 200 Petaluma, California 94954

Jim O’Toole Project Director David Davis, AICP Project Manager, Aesthetics Brian Pittman, CWB Deputy Project Manager, Sr. Technical Reviewer Matthew Fagundes Sr. Technical Reviewer Janna Scott, J.D. QA/QC

Tessa Verhoef Geology and Soils, Utilities and Service Systems, Hazards and Hazardous Materials, Transportation and Traffic

Maria Hensel Agriculture, Hydrology and Water Quality, Population and Housing, Recreatio Public Services, Mineral Resources, Land Use and Planning

Liza Wozniak Biological Resources

Jyothi Iyer Air Quality, Greenhouse Gas Emissions, Noise

Heidi Koenig, RPA Cultural and Paleontological Resources

4. Report Preparers


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CHAPTER 5 Mitigation Monitoring and Reporting Program

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e pa

ved

shal

l be

com

plet

ed a

s so

on a

s po

ssib

le. B

uild

ing

pads

sha

ll be

laid

as

soon

as

poss

ible

afte

r gra

ding

un

less

see

ding

or s

oil b

inde

rs a

re u

sed.

6.

Id

ling

times

sha

ll be

min

imiz

ed e

ither

by

shut

ting

equi

pmen

t off

whe

n no

t in

use

or re

duci

ng th

e m

axim

um id

ling

time

to 5

min

utes

(as

requ

ired

by th

e C

alifo

rnia

ai

rbor

ne to

xics

con

trol m

easu

re T

itle

13, S

ectio

n 24

85 o

f Cal

iforn

ia C

ode

of

Reg

ulat

ions

[CC

R]).

Cle

ar s

igna

ge s

hall

be p

rovi

ded

for c

onst

ruct

ion

wor

kers

at

all a

cces

s po

ints

. 7.

Al

l con

stru

ctio

n eq

uipm

ent s

hall

be m

aint

aine

d an

d pr

oper

ly tu

ned

in

acco

rdan

ce w

ith m

anuf

actu

rer’s

spe

cific

atio

ns. A

ll eq

uipm

ent s

hall

be c

heck

ed

prio

r to

the

star

t of c

onst

ruct

ion

by a

cer

tifie

d vi

sibl

e em

issi

ons

eval

uato

r.

8.

Post

a p

ublic

ly v

isib

le s

ign

with

the

tele

phon

e nu

mbe

r and

per

son

to c

onta

ct a

t Zo

ne 7

rega

rdin

g du

st c

ompl

aint

s. T

his

pers

on s

hall

resp

ond

and

take

co

rrec

tive

actio

n w

ithin

48

hour

s. T

he B

AAQ

MD

’s p

hone

num

ber s

hall

also

be

visi

ble

to e

nsur

e co

mpl

ianc

e w

ith a

pplic

able

regu

latio

ns.

Con

tract

or is

resp

onsi

ble

for

impl

emen

tatio

n of

all

air q

ualit

y co

ntro

l mea

sure

s, e

xclu

ding

si

gnag

e fo

r whi

ch Z

one

7 is

re

spon

sibl

e.

Dur

ing

cons

truct

ion.

C

ontra

ctor

sha

ll pe

rform

dai

ly

insp

ectio

ns c

onfir

m w

ith Z

one

7 th

at

mea

sure

s ar

e be

ing

impl

emen

ted.

C

ontra

ctor

is re

spon

sibl

e fo

r id

entif

ying

any

laps

es o

r iss

ues,

re

ctify

ing

them

, and

not

ifyin

g Zo

ne 7

.

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m, D

VWTP

Ozo

natio

n Pr

ojec

t

DVW

TP O

zona

tion

Proj

ect

5-2

ESA

/ 160

463.

06

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m

Oct

ober

201

7

Miti

gatio

n M

easu

re

Impl

emen

tatio

n R

espo

nsib

ility

Im

plem

enta

tion

Tim

ing

Mon

itorin

g, E

nfor

cem

ent,

and

Rep

ortin

g R

espo

nsib

ility

Bio

logi

cal R

esou

rces

Miti

gatio

n M

easu

re B

IO-1

: Exc

lusi

on F

enci

ng.

Zone

7 o

r its

con

stru

ctio

n co

ntra

ctor

sha

ll in

stal

l a w

ildlif

e ex

clus

ion

fenc

e at

the

perim

eter

of t

he w

ork

area

, as

esta

blis

hed

by a

qua

lifie

d bi

olog

ist,

and

mai

ntai

ned

for t

he d

urat

ion

of c

onst

ruct

ion.

The

fenc

e sh

all c

onta

in e

xit f

unne

ls to

allo

w a

ny

Cal

iforn

ia re

d-le

gged

frog

or C

alifo

rnia

tige

r sal

aman

der w

ithin

the

cons

truct

ion

area

to le

ave

with

out h

uman

inte

rven

tion,

whi

le p

reve

ntin

g en

try in

to th

e co

nstru

ctio

n zo

ne. E

xit f

unne

ls s

hall

be p

lace

d no

mor

e th

an 1

00 fe

et a

part

alon

g th

e fe

nce.

The

exi

t fun

nels

sha

ll be

inst

alle

d at

gro

und

leve

l. W

ork

wou

ld b

e pr

ohib

ited

outs

ide

the

excl

usio

n fe

ncin

g. T

he c

ontra

ctor

sha

ll re

mov

e th

e fe

nce

upon

com

plet

ion

of c

onst

ruct

ion.

Con

tract

or is

resp

onsi

ble

for

impl

emen

ting

and

mai

ntai

ning

ex

clus

ion

fenc

ing

as d

irect

ed

by th

e Zo

ne 7

des

igna

ted

repr

esen

tativ

e or

qua

lifie

d bi

olog

ist.

Con

tract

or is

resp

onsi

ble

for

prop

er in

stal

latio

n, re

mov

al a

nd

disp

osal

of e

xclu

sion

fenc

ing.

Prio

r to,

and

dur

ing

cons

truct

ion.

Zo

ne 7

will

hav

e da

ily o

nsite

pro

ject

m

onito

ring.

Miti

gatio

n M

easu

re B

IO-2

: Pre

-Con

stru

ctio

n B

ird S

urve

ys.

If co

nstru

ctio

n or

veg

etat

ion

rem

oval

mus

t be

perfo

rmed

dur

ing

the

nest

ing

perio

d (F

ebru

ary

1 th

roug

h Au

gust

31)

a q

ualif

ied

biol

ogis

t sha

ll su

rvey

veg

etat

ion

to

verif

y th

e pr

esen

ce o

r abs

ence

of n

ests

no

mor

e th

an 7

day

s pr

ior t

o th

e st

art o

f co

nstru

ctio

n ac

tiviti

es, i

nclu

ding

the

clea

ranc

e of

veg

etat

ion.

If n

o ne

sts

are

foun

d an

d th

e si

te is

cle

ared

of v

eget

atio

n, n

o fu

rther

sur

vey

wou

ld b

e re

quire

d. If

act

ive

nest

s ar

e ob

serv

ed, Z

one

7 or

its

cons

truct

ion

cont

ract

or, i

n co

nsul

tatio

n w

ith a

qu

alifi

ed b

iolo

gist

, sha

ll es

tabl

ish

buffe

r zon

es a

roun

d ne

st a

reas

. Typ

ical

sta

rting

ne

st b

uffe

rs a

re 1

00 fe

et fo

r pas

serin

e bi

rds,

dep

endi

ng u

pon

the

natu

re o

f pr

opos

ed a

ctiv

ities

and

the

sens

itivi

ty o

f the

iden

tifie

d bi

rd to

dis

turb

ance

, and

150

to

250

feet

for r

apto

rs. C

onst

ruct

ion

activ

ities

sha

ll be

avo

ided

or m

odifi

ed w

ithin

th

e bu

ffer a

rea

until

you

ng b

irds

have

fled

ged,

whi

ch s

hall

be c

onfir

med

by

the

qual

ified

bio

logi

st. B

uffe

r siz

es m

ay b

e re

duce

d fro

m th

e in

itial

ly e

stab

lishe

d di

stan

ces

follo

win

g re

view

by

the

qual

ified

bio

logi

st a

nd/o

r coo

rdin

atio

n w

ith

CD

FW.

Zone

7 is

resp

onsi

ble

for

impl

emen

ting

all b

iolo

gica

l su

rvey

s an

d m

onito

ring.

C

ontra

ctor

sha

ll no

tify

Zone

7

imm

edia

tely

sho

uld

they

en

coun

ter a

ny b

ird n

ests

, or

beha

vior

that

sug

gest

s ne

stin

g in

the

Proj

ect a

rea.

C

ontra

ctor

sha

ll es

tabl

ish

prot

ectio

ns (e

.g.,

cone

s,

flagg

ing)

aro

und

the

buffe

r zo

nes

if ne

eded

as

dire

cted

by

Zone

7.

Con

tract

or is

resp

onsi

ble

for

prop

er in

stal

latio

n, re

mov

al a

nd

disp

osal

of p

rote

ctiv

e m

easu

res

as d

eter

min

ed b

y Zo

ne 7

in c

onsu

ltatio

n w

ith a

qu

alifi

ed b

iolo

gist

Prio

r to,

and

dur

ing

cons

truct

ion.

Zo

ne 7

will

hav

e da

ily o

nsite

pro

ject

m

onito

ring.

Zo

ne 7

, in

cons

ulta

tion

with

a

qual

ified

wild

life

biol

ogis

t, w

ill de

term

ine

the

buffe

r wid

th a

nd th

e ty

pes

of c

onst

ruct

ion

activ

ities

al

low

ed o

r pro

hibi

ted

with

in th

e bu

ffer.

Zone

7 is

resp

onsi

ble

for n

otify

ing

CD

FW o

r U.S

. Fis

h an

d W

ildlif

e Se

rvic

e, a

s ne

eded

.

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m, D

VWTP

Ozo

natio

n Pr

ojec

t

DVW

TP O

zona

tion

Proj

ect

5-3

ESA

/ 160

463.

06

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m

Oco

tber

201

7

Miti

gatio

n M

easu

re

Impl

emen

tatio

n R

espo

nsib

ility

Im

plem

enta

tion

Tim

ing

Mon

itorin

g, E

nfor

cem

ent,

and

Rep

ortin

g R

espo

nsib

ility

Cul

tura

l Res

ourc

es

Miti

gatio

n M

easu

re C

UL-

1: A

ccid

enta

l Dis

cove

ry o

f Arc

haeo

logi

cal

Res

ourc

es.

If cu

ltura

l res

ourc

es a

re e

ncou

nter

ed d

urin

g co

nstru

ctio

n, th

e co

ntra

ctor

sha

ll av

oid

any

furth

er d

istu

rban

ce o

f the

mat

eria

ls a

nd im

med

iate

ly d

isco

ntin

ue e

arth

wor

k w

ithin

100

feet

of t

he fi

nd (i

n ac

cord

ance

with

Ala

med

a C

ount

y P

olic

y on

Cul

tura

l R

esou

rces

[Ala

med

a C

ount

y 20

02]).

At t

hat t

ime,

Zon

e 7

shal

l con

tact

a q

ualif

ied

arch

aeol

ogis

t, ce

rtifie

d by

the

Reg

iste

r of P

rofe

ssio

nal A

rche

olog

ists

(RPA

), to

ev

alua

te th

e si

tuat

ion.

Any

iden

tifie

d ar

chae

olog

ical

reso

urce

s sh

all b

e re

cord

ed b

y th

e ar

cheo

logi

st o

n D

epar

tmen

t of P

arks

and

Rec

reat

ion

523

form

, or s

imila

r fo

rms.

Pro

ject

per

sonn

el s

hall

not c

olle

ct c

ultu

ral r

esou

rces

. Pro

cedu

res

for

stop

ping

con

stru

ctio

n, in

the

even

t tha

t cul

tura

l res

ourc

es a

re e

xpos

ed, s

hall

be

part

of th

e Pr

ojec

t pla

ns a

nd d

ocum

ents

. In

antic

ipat

ion

of d

isco

verin

g cu

ltura

l de

posi

ts, p

roce

dure

s sh

all b

e in

pla

ce s

o th

at th

e co

ntra

ctor

can

mov

e on

to

anot

her p

hase

of w

ork,

thus

allo

win

g su

ffici

ent t

ime

to e

valu

ate

the

natu

re a

nd

sign

ifica

nce

of th

e fin

d an

d im

plem

ent a

ppro

pria

te m

anag

emen

t pro

cedu

res.

Con

tract

or is

resp

onsi

ble

for

stop

ping

wor

k if

any

pote

ntia

l ar

chae

olog

ical

reso

urce

is

disc

over

ed, a

nd w

ill n

otify

the

Zone

7 p

roje

ct m

anag

er.

Zone

7 w

ill c

onta

ct a

nd re

tain

th

e qu

alifi

ed a

rcha

eolo

gist

.

Dur

ing

cons

truct

ion.

Zo

ne 7

will

be

resp

onsi

ble

for

info

rmin

g an

d co

mpl

ying

with

the

requ

irem

ents

of t

he re

gula

tory

ag

enci

es o

vers

eein

g ar

chae

olog

ical

re

sour

ces.

Miti

gatio

n M

easu

re C

UL-

2: A

ccid

enta

l Dis

cove

ry o

f Pal

eont

olog

ical

R

esou

rces

. If

pale

onto

logi

cal r

esou

rces

, suc

h as

foss

ilize

d bo

ne, t

eeth

, she

ll, tr

acks

, tra

ils,

cast

s, m

olds

, or i

mpr

essi

ons

are

enco

unte

red

by c

onst

ruct

ion

pers

onne

l dur

ing

Proj

ect i

mpl

emen

tatio

n, a

ll co

nstru

ctio

n ac

tiviti

es w

ithin

50

feet

sha

ll ha

lt an

d th

e co

ntra

ctor

sha

ll no

tify

Zone

7. Z

one

7 sh

all r

etai

n a

qual

ified

pal

eont

olog

ist t

o in

spec

t the

find

ings

with

in 2

4 ho

urs

of d

isco

very

. The

pal

eont

olog

ist s

hall

asse

ss

the

natu

re a

nd im

porta

nce

of th

e fin

d an

d, if

nec

essa

ry, d

evel

op a

ppro

pria

te

treat

men

t mea

sure

s in

con

form

ance

with

Soc

iety

of V

erte

brat

e Pa

leon

tolo

gy

stan

dard

s (2

010)

, and

in c

onsu

ltatio

n w

ith Z

one

7.

Con

tract

or is

resp

onsi

ble

for

stop

ping

wor

k if

any

pote

ntia

l pa

leon

tolo

gica

l res

ourc

e is

di

scov

ered

, and

will

not

ify th

e Zo

ne 7

pro

ject

man

ager

. Zo

ne 7

will

con

tact

and

reta

in

the

qual

ified

pal

eont

olog

ist.

Dur

ing

cons

truct

ion.

Zo

ne 7

, as

need

ed.

Miti

gatio

n M

easu

re C

UL-

3: A

ccid

enta

l Dis

cove

ry o

f Hum

an R

emai

ns.

In th

e ev

ent t

hat h

uman

rem

ains

are

enc

ount

ered

, gro

und

dist

urbi

ng a

ctiv

ities

100

fe

et o

f tha

t loc

atio

n sh

all c

ease

imm

edia

tely

. The

re s

hall

be n

o fu

rther

exc

avat

ion

or d

istu

rban

ce w

ithin

this

radi

us u

ntil

the

Cou

nty

Cor

oner

mak

es a

det

erm

inat

ion

of

whe

ther

an

inve

stig

atio

n of

the

caus

e of

dea

th is

requ

ired

or th

at th

e re

mai

ns a

re

Nat

ive

Amer

ican

. If t

he c

oron

er d

eter

min

es th

at th

e re

mai

ns a

re N

ativ

e Am

eric

an,

then

the

Nat

ive

Amer

ican

Her

itage

Com

mis

sion

(NAH

C) s

hall

be c

onta

cted

with

in

24 h

ours

(by

Cou

nty

coro

ner)

, alo

ng w

ith th

e M

ost L

ikel

y D

esce

ndan

t(s) o

f the

de

ceas

ed N

ativ

e Am

eric

an (b

y th

e N

AHC

), an

d di

spos

ition

of t

he re

mai

ns s

hall

be

in a

ccor

danc

e w

ith a

ll ap

plic

able

law

s an

d re

gula

tions

.

Con

tract

or is

resp

onsi

ble

for

stop

ping

wor

k if

any

pote

ntia

l hu

man

rem

ains

are

di

scov

ered

, and

will

not

ify th

e Zo

ne 7

pro

ject

man

ager

. Zo

ne 7

will

con

tact

the

Cou

nty

coro

ner.

Zon

e 7

will

als

o co

ntac

t the

NAH

C a

nd M

ost

Like

ly D

esce

ndan

t(s) i

f rem

ains

ar

e th

ough

t to

be N

ativ

e Am

eric

an.

Dur

ing

cons

truct

ion.

Zo

ne 7

will

be

resp

onsi

ble

for

seei

ng th

at th

e re

mai

ns a

re h

andl

ed

in a

ccor

danc

e w

ith a

ll ap

plic

able

la

ws

and

regu

latio

ns.

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m, D

VWTP

Ozo

natio

n Pr

ojec

t

DVW

TP O

zona

tion

Proj

ect

5-4

ESA

/ 160

463.

06

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m

Oct

ober

201

7

Miti

gatio

n M

easu

re

Impl

emen

tatio

n R

espo

nsib

ility

Im

plem

enta

tion

Tim

ing

Mon

itorin

g, E

nfor

cem

ent,

and

Rep

ortin

g R

espo

nsib

ility

Haz

ards

and

Haz

ardo

us M

ater

ials

Miti

gatio

n M

easu

re H

AZ-

1: U

nant

icip

ated

Soi

l or G

roun

dwat

er

Con

tam

inat

ion.

Zo

ne 7

sha

ll re

quire

the

cons

truct

ion

cont

ract

or to

follo

w th

e pr

oced

ures

bel

ow in

th

e ev

ent c

onta

min

ated

soi

l or g

roun

dwat

er is

enc

ount

ered

(eith

er v

isua

lly, t

hrou

gh

odor

det

ectio

n, o

r ano

ther

met

hod)

dur

ing

cons

truct

ion:

Stop

wor

k in

the

vici

nity

of t

he s

uspe

cted

mat

eria

ls;

Secu

re th

e ar

ea o

f sus

pect

ed c

onta

min

atio

n;

Not

ify Z

one

7 im

med

iate

ly, w

ho s

hall

then

con

tact

the

appr

opria

te re

gula

tory

ag

enci

es;

Iden

tify

the

natu

re a

nd e

xten

t of c

onta

min

atio

n;

Con

tain

the

area

s of

con

tam

inat

ion;

Perfo

rm a

ppro

pria

te c

lean

up

proc

edur

es (s

uch

as s

egre

gate

, pro

file,

and

di

spos

e of

all

cont

amin

ated

soi

l). R

equi

red

disp

osal

met

hod

will

dep

end

on th

e ty

pe a

nd c

once

ntra

tion

of c

onta

min

atio

n id

entif

ied;

and

Any

site

inve

stig

atio

n or

rem

edia

tion

shal

l be

perfo

rmed

in a

ccor

danc

e w

ith

appl

icab

le re

gula

tions

. Wor

k sh

all n

ot re

sum

e in

the

area

(s) a

ffect

ed u

ntil

the

abov

e m

easu

res

have

bee

n im

plem

ente

d un

der t

he o

vers

ight

of Z

one

7 or

re

gula

tory

age

ncy,

as

appr

opria

te.

Con

tract

or is

resp

onsi

ble

for

notif

ying

Zon

e 7

imm

edia

tely

up

on e

ncou

nter

ing

cont

amin

ated

soi

l or

grou

ndw

ater

. C

ontra

ctor

is re

spon

sibl

e fo

r co

ntai

ning

the

area

(s) o

f co

ntam

inat

ion,

and

to th

e ex

tent

pos

sibl

e, id

entif

ying

the

natu

re a

nd e

xten

t of

cont

amin

atio

n.

Con

tract

or is

resp

onsi

ble

for

appl

ying

the

appr

opria

te c

lean

up

pro

cedu

res

and

prep

arin

g th

e m

anife

st d

ocum

enta

tion

for

Zone

7 a

ppro

val.

Dur

ing

cons

truct

ion.

Zo

ne 7

, as

need

ed.

Miti

gatio

n M

easu

re H

AZ-

2: Id

entif

y U

nder

grou

nd U

tiliti

es.

The

cont

ract

or(s

) sha

ll id

entif

y un

derg

roun

d ut

ility

line

s su

ch a

s na

tura

l gas

, el

ectri

city

, sew

er, t

elep

hone

, fue

l, an

d w

ater

line

s th

at m

ay b

e en

coun

tere

d du

ring

exca

vatio

n w

ork.

Info

rmat

ion

rega

rdin

g th

e si

ze, t

ype,

and

loca

tion

of e

xist

ing

utili

ties

will

be c

onfir

med

by

the

utili

ty s

ervi

ce p

rovi

der o

r thr

ough

pot

holin

g co

nduc

ted

by th

e co

ntra

ctor

. A d

etai

led

engi

neer

ing

and

cons

truct

ion

plan

that

id

entif

ies

cons

truct

ion

met

hods

and

pro

tect

ive

mea

sure

s to

min

imiz

e im

pact

s on

ab

oveg

roun

d an

d be

low

grou

nd u

tiliti

es s

hall

be p

repa

red.

Con

stru

ctio

n sh

all b

e sc

hedu

led

to m

inim

ize

or a

void

inte

rrup

tion

of u

tility

ser

vice

s to

cus

tom

ers.

The

co

ntra

ctor

(s) s

hall

prom

ptly

reco

nnec

t any

dis

conn

ecte

d ut

ility

line

s.

Con

tract

or is

resp

onsi

ble

for

furth

er v

erifi

catio

n of

util

ity

loca

tions

by

poth

olin

g.

Prio

r to,

and

dur

ing

cons

truct

ion.

C

ontra

ctor

sha

ll co

nfirm

with

Zon

e 7

that

mea

sure

s ar

e be

ing

impl

emen

ted.

C

ontra

ctor

is re

spon

sibl

e fo

r id

entif

ying

any

laps

es o

r iss

ues,

re

ctify

ing

them

, and

not

ifyin

g Zo

ne 7

.

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m, D

VWTP

Ozo

natio

n Pr

ojec

t

DVW

TP O

zona

tion

Proj

ect

5-5

ESA

/ 160

463.

06

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m

Oco

tber

201

7

Miti

gatio

n M

easu

re

Impl

emen

tatio

n R

espo

nsib

ility

Im

plem

enta

tion

Tim

ing

Mon

itorin

g, E

nfor

cem

ent,

and

Rep

ortin

g R

espo

nsib

ility

Haz

ards

and

Haz

ardo

us M

ater

ials

(con

t.)

Miti

gatio

n M

easu

re H

AZ-

3: F

ire S

afet

y Pr

actic

es.

Zone

7 s

hall

requ

ire th

e co

nstru

ctio

n co

ntra

ctor

to e

nsur

e th

at th

e fo

llow

ing

fire

safe

ty c

onst

ruct

ion

prac

tices

are

impl

emen

ted:

Earth

mov

ing

and

porta

ble

equi

pmen

t with

inte

rnal

com

bust

ion

engi

nes

shal

l be

equi

pped

with

a s

park

s ar

rest

or to

redu

ce th

e po

tent

ial f

or ig

nitin

g a

wild

land

fir

e;

Appr

opria

te fi

re s

uppr

essi

on e

quip

men

t sha

ll be

mai

ntai

ned

at th

e co

nstru

ctio

n si

te;

Flam

mab

le m

ater

ials

sha

ll be

rem

oved

to a

dis

tanc

e of

10

feet

from

any

eq

uipm

ent t

hat c

ould

pro

duce

a s

park

, fire

, or f

lam

e; a

nd

Con

stru

ctio

n pe

rson

nel s

hall

be tr

aine

d in

fire

saf

e w

ork

prac

tices

, use

of f

ire

supp

ress

ion

equi

pmen

t, an

d pr

oced

ures

to fo

llow

in th

e ev

ent o

f a fi

re.

Con

tract

or is

resp

onsi

ble

for

impl

emen

tatio

n of

all

haza

rds

and

haza

rdou

s m

ater

ials

m

itiga

tion

mea

sure

s.

Prio

r to,

and

dai

ly d

urin

g co

nstru

ctio

n C

ontra

ctor

sha

ll co

nfirm

with

Zon

e 7

that

mea

sure

s ar

e be

ing

impl

emen

ted.

C

ontra

ctor

is re

spon

sibl

e fo

r id

entif

ying

any

laps

es o

r iss

ues,

re

ctify

ing

them

, and

not

ifyin

g Zo

ne 7

.

Hyd

rolo

gy a

nd W

ater

Qua

lity

Miti

gatio

n M

easu

re W

Q-1

: Sto

rmw

ater

Pol

lutio

n Pr

even

tion

Plan

. Zo

ne 7

or i

ts c

onst

ruct

ion

cont

ract

or s

hall

prep

are

a si

te-s

peci

fic S

WPP

P in

ac

cord

ance

with

the

term

s of

the

NPD

ES G

ener

al C

onst

ruct

ion

Activ

ities

St

orm

wat

er P

erm

it (O

rder

No.

001

4-D

WQ

, NPD

ES N

o. C

AS00

0002

, or c

urre

nt

vers

ion)

. It s

hall

requ

ire th

e co

nstru

ctio

n co

ntra

ctor

to in

corp

orat

e th

e SW

PPP’

s Be

st M

anag

emen

t Pra

ctic

es (B

MP)

into

all

aspe

cts

of th

e Pr

ojec

t. Th

e BM

Ps s

hall

incl

ude

mea

sure

s fo

r man

agem

ent a

nd o

pera

tion

of th

e co

nstru

ctio

n si

te to

con

trol

an

d m

inim

ize

pote

ntia

l con

tribu

tion

of p

ollu

tant

s to

sto

rmw

ater

runo

ff fro

m th

ese

area

s. T

hese

mea

sure

s sh

all a

ddre

ss s

ite-s

peci

fic m

etho

ds fo

r pre

vent

ing

and

min

imiz

ing

eros

ion

and

deliv

ery

of s

edim

enta

tion

thro

ugh

cons

truct

ion

man

agem

ent p

ract

ices

to e

nsur

e co

ntro

l of p

oten

tial w

ater

pol

lutio

n so

urce

s.

Con

stru

ctio

n ph

ase

BMPs

sha

ll be

in a

ccor

danc

e w

ith th

e N

PDE

S G

ener

al

Con

stru

ctio

n Ac

tiviti

es S

torm

wat

er P

erm

it an

d sh

all i

nclu

de, b

ut a

re n

ot li

mite

d to

:

Pre-

cons

truct

ion

insp

ectio

n by

a q

ualif

ied

biol

ogis

t to

verif

y pl

acem

ent o

f sto

rm

wat

er a

nd e

rosi

on c

ontro

l dev

ices

suf

ficie

nt to

avo

id o

ff-si

te im

pact

s.

Dus

t con

trol m

easu

res,

as

outli

ned

unde

r Miti

gatio

n M

easu

re A

Q-1

, and

as

stat

ed in

the

NPD

ES G

ener

al C

onst

ruct

ion

Activ

ities

Sto

rmw

ater

Per

mit,

sha

ll be

con

duct

ed w

hile

min

imiz

ing

exce

ssiv

e us

e of

wat

er, s

uch

that

wat

er is

not

pe

rmitt

ed to

poo

l or g

ener

ate

cond

ition

s le

adin

g to

exc

essi

ve d

eliv

ery

of

sedi

men

ts th

roug

h ru

noff.

Con

tract

or is

resp

onsi

ble

for

prep

arin

g SW

PPP,

to b

e re

view

ed a

nd a

ppro

ved

by

Zone

7.

Con

stru

ctio

n co

ntra

ctor

to

impl

emen

t all

cons

truct

ion

and

post

-con

stru

ctio

n BM

Ps.

Prio

r to,

and

dur

ing

cons

truct

ion.

C

ontra

ctor

sha

ll co

nfirm

with

Zon

e 7

that

mea

sure

s ar

e be

ing

impl

emen

ted.

C

ontra

ctor

is re

spon

sibl

e fo

r id

entif

ying

any

laps

es o

r iss

ues,

re

ctify

ing

them

, and

not

ifyin

g Zo

ne

7.

Con

tract

or is

resp

onsi

ble

for

mon

itorin

g an

d re

porti

ng to

Zon

e 7.

Zo

ne 7

to re

view

con

tract

or re

ports

an

d ta

ke a

ctio

n as

nec

essa

ry.

Hyd

rolo

gy a

nd W

ater

Qua

lity

(con

t.)

Stab

ilize

sto

ckpi

led

soils

by

cove

ring

pile

s da

ily a

t the

con

clus

ion

of g

radi

ng

activ

ity, b

efor

e/du

ring

rain

eve

nts,

or i

f the

y ar

e un

used

for a

n ex

tend

ed p

erio

d

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m, D

VWTP

Ozo

natio

n Pr

ojec

t

DVW

TP O

zona

tion

Proj

ect

5-6

ESA

/ 160

463.

06

Miti

gatio

n M

onito

ring

and

Rep

ortin

g Pr

ogra

m

Oct

ober

201

7

Miti

gatio

n M

easu

re

Impl

emen

tatio

n R

espo

nsib

ility

Im

plem

enta

tion

Tim

ing

Mon

itorin

g, E

nfor

cem

ent,

and

Rep

ortin

g R

espo

nsib

ility

of ti

me.

Plac

emen

t of (

non-

poly

mer

) silt

bar

riers

, stra

w w

attle

s, o

r oth

er a

ppro

pria

te

prot

ectiv

e de

vice

s ar

ound

inle

ts o

f all

stor

m d

rain

s on

site

to m

inim

ize

eros

ion

and

disc

harg

e of

silt

y w

ater

or r

unof

f, as

det

erm

ined

by

qual

ified

sto

rmw

ater

qu

ality

pra

ctiti

oner

(QSP

).

Mai

nten

ance

of s

torm

dra

in in

lets

, inc

ludi

ng d

ry s

wee

ping

and

rout

ine

plac

emen

t che

cks

by Z

one

7 pe

rson

nel,

or d

esig

nate

d qu

alifi

ed m

onito

r at t

he

conc

lusi

on o

f the

wor

kday

.

Mea

sure

s sh

all b

e ta

ken

on s

ite to

ens

ure

that

oils

(as

may

be

used

in ro

utin

e m

aint

enan

ce o

f con

stru

ctio

n eq

uipm

ent)

are

prev

ente

d fro

m s

pilli

ng o

r ot

herw

ise

reac

hing

sur

face

s th

at c

ould

resu

lt in

eve

ntua

l del

iver

y to

sto

rm

drai

ns. T

he c

onst

ruct

ion

site

sha

ll be

che

cked

dai

ly a

t the

con

clus

ion

of th

e w

orkd

ay to

ens

ure

that

fuel

s, o

ils a

nd o

ther

pot

entia

lly to

xic

subs

tanc

es a

re

secu

red

and

not l

eft o

n th

e gr

ound

s.

Addi

tiona

l BM

Ps a

s de

term

ined

by

Zone

7 in

ord

er to

mai

ntai

n co

mpl

ianc

e w

ith

the

term

s of

its

NPD

ES (M

unic

ipal

Reg

iona

l Sto

rmw

ater

NPD

ES P

erm

it,

“MR

P”) p

erm

it, o

r oth

er re

gula

tory

requ

irem

ent d

eem

ed a

pplic

able

sha

ll be

in

corp

orat

ed in

to th

e SW

PPP,

as

appr

opria

te.

Post

-con

stru

ctio

n ph

ase

BMPs

sha

ll be

in a

ccor

danc

e w

ith th

e N

PDES

Gen

eral

C

onst

ruct

ion

Activ

ities

Sto

rmw

ater

Per

mit

and

shal

l inc

lude

, but

are

not

lim

ited

to:

The

site

sha

ll be

sw

ept o

r oth

erw

ise

clea

red

of a

ll de

bris

, inc

ludi

ng g

arba

ge

and

plas

tics

daily

and

at t

he c

oncl

usio

n of

the

cons

truct

ion

perio

d.

The

site

sha

ll be

insp

ecte

d by

Zon

e 7

pers

onne

l, or

des

igna

ted

qual

ified

m

onito

r at t

he c

oncl

usio

n of

the

cons

truct

ion

perio

d to

ens

ure

corr

ect

plac

emen

t of e

rosi

on c

ontro

l mea

sure

s.

Any

addi

tiona

l BM

Ps, a

s de

term

ined

by

Zone

7 in

ord

er to

mai

ntai

n co

mpl

ianc

e w

ith th

e te

rms

of it

s N

PDES

(MR

P) p

erm

it, o

r oth

er re

gula

tory

re

quire

men

t dee

med

app

licab

le s

hall

be in

corp

orat

ed in

to th

e S

WPP

P, a

s ap

prop

riate

.

The

mea

sure

s in

clud

ed in

the

SWPP

P sh

all b

e m

onito

red

on a

wee

kly

basi

s,

or g

reat

er a

s re

quire

d by

Per

mit,

for e

ffect

iven

ess

at li

miti

ng d

eliv

ery

of

sedi

men

ts o

r oth

er to

xic

subs

tanc

es to

the

stor

m d

rain

s. If

a m

easu

re is

foun

d to

be

inef

fect

ive,

it s

hall

be re

desi

gned

or r

epla

ced

with

out d

elay

.

APPENDIX A Air Quality Modeling Outputs

Del Valle Water Treatment Plant Ozonation Project A-1 ESA / 160463.06 Initial Study / Mitigated Negative Declaration July 2017


A-2

Average Daily Construction-related Pollutant EmissionsYear ROG NOx PM10 PM2.52018* 0.2031 2.0668 0.1116 0.10322019* 0.1281 0.7113 0.038 0.0359Total Tons 0.3312 2.7781 0.1496 0.1391Total Pounds 662.4 5556.2 299.2 278.2Pounds per workday 1.5 12.6 0.7 0.6Note: The Project would take an estimated 440 workdays to complete.*Obtained from CalEEMod output file that follows this page.

Electrical Load Demand*Project Component KVAMCC-XX (Ozone Generation Building) 459MCC-XX (Ozone Generation Building-Emergency Loads) 15.7

MCC-XX (Ozone Contactor Structure) 98MCC-XX (Ozone Contactor Structure -Emergency Loads) 18.4

Total Normal Load (for GHG indirect emissions) 557

Total Emergency Loads (for GHG and AQ exhaust assoc. w/ emergency generator testing)

34.1

Emergency Generator RatingEmergency Load (KVA) power fac. KW load HP Load Factor* HP rating34.1 0.8 27.3 36.6 0.73 50.134.1 0.9 30.7 41.2 0.73 56.434.1 1.0 34.1 45.7 0.73 62.6 1 horsepower (metric) = 0.7457 kW*Obtained from CalEEMod output file that follows this page.

Emergency Generator Testing EmissionsUnits ROG NOx PM10 PM2.5 CO2etons or metric tons/year* 0.00246 0.00803 0.00036 0.00036 1.1464pounds/year 4.92 16.06 0.72 0.72 --pounds/day (50 days/yr) 0.0984 0.3212 0.0144 0.0144 --Note: Generator testing would be limited to 1 hour tests per day, 50 times a year.

Indirect Emissions from Electricity Usage

Operating Load (KVA) power fac. kWMWh (assume 24

x 365 hrs) MT CO2/MWh* CO2 (MT)550.7 0.8 440.56 3,859 0.139 536.44348550.7 0.9 495.63 4,342 0.139 603.49891550.7 1 550.7 4,824 0.139 670.55435

Total GHG EmissionsGHG 33711

6711,019

Indirect Emissions from Electricity Use

Source

Total (metric tons per year)

* Obtained from CDM Smith, 2017. Del Valle Water Treatment Plant Ozonation Project, Project Drawings, 30%Submittal Not for Construction, May 2017.

*Pacific Gas and Electric Company (PG&E), 2015. Greenhouse Gas Emission Factors: Guidance for PG&ECustomers, November 2015.

*Obtained from CalEEMod output file that follows this page. CO2 is provided in metric tons, all other emissions aretons.

Construction AmortizedEmergency Generator

A-3

1.1

Lan

d U

sag

e

Land

Use

sS

ize

Met

ricLo

t Acr

eage

Flo

or S

urfa

ce A

rea

Pop

ulat

ion

Use

r D

efin

ed In

dust

rial

11,0

00.0

0U

ser

Def

ined

Uni

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ual

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y b

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and

Use

- E

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rici

ty

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ctric

ity

Use

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al C

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CH

4N

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Use

kWh/

yrM

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r

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Un

mit

igat

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Ox

CO

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ve

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otal

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itive

P

M2.

5E

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st

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alB

io-

CO

2N

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- C

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al C

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4N

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egor

yto

ns/y

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r

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ctur

al

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5.74

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003

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sum

er

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scap

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9.57

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003

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004

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: Cal

EE

Mod

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6.3.

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6/2

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17 1

:17

AM

Pag

e 26

of 3

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DV

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ual

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7.1

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igat

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Mea

sure

s W

ater

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al C

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and

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Mod

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Ver

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: Cal

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Mod

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6.3.

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Pag

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Mod

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Ver

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: Cal

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Mod

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6.3.

1D

ate:

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17 1

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AM

Pag

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of 3

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Ann

ual

A-3

3


A-34

Del Valle Water Treatment Plant Ozonation Project B-1 ESA / 160463.06 Initial Study / Mitigated Negative Declaration July 2017

APPENDIX B Listed and Special-Status Species Considered

Appendix B

Del Valle Water Treatment Plant Ozonation Project B-2 ESA / 160463.06 Initial Study / Mitigated Negative Declaration July 2017


App

endi

x B

Del

Val

le W

ater

Tre

atm

ent P

lant

Ozo

natio

n Pr

ojec

t B

-3

ES

A /

1604

63.0

6 In

itial S

tudy

/ M

itiga

ted

Neg

ativ

e D

ecla

ratio

n Ju

ly 2

017

TAB

LE B

.1

LIST

ED A

ND

SPE

CIA

L-ST

ATU

S SP

ECIE

S C

ON

SID

ERED

FO

R D

EL V

ALLE

WA

TER

TR

EATM

ENT

PLAN

T U

PGR

AD

E

Nam

e

List

ing

Stat

us

Gen

eral

Hab

itat R

equi

rem

ents

O

ccur

renc

e

Pote

ntia

l for

Spe

cies

Occ

urre

nce

W

ithin

the

Surv

ey A

rea

Inve

rtebr

ates

Con

serv

ancy

fairy

shr

imp

(Bra

nchi

nect

a co

nser

vatio

) FE

/--

Ver

nal p

ools

. E

ndem

ic to

the

gras

slan

ds o

f the

nor

ther

n tw

o-th

irds

of th

e C

entra

l Val

ley

Abs

ent.

Hab

itat i

s no

t pre

sent

at p

roje

ct s

ite.

Long

horn

fairy

shr

imp

(B

ranc

hine

cta

long

iant

enna

) FE

/--

Ver

nal p

ools

or o

ther

are

as c

apab

le o

f pon

ding

w

ater

sea

sona

lly

End

emic

to th

e ea

ster

n m

argi

n of

the

Cen

tral

Coa

st m

ount

ains

in s

easo

nally

ast

atic

gr

assl

and

vern

al p

ools

Abs

ent.

Hab

itat i

s no

t pre

sent

at p

roje

ct s

ite.

Ver

nal p

ool f

airy

shr

imp

(Bra

nchi

nect

a ly

nchi

) FT

/--

Gra

ssla

nd v

erna

l poo

ls.

Eas

t San

Fra

ncis

co B

ay in

clud

ing

Live

rmor

e ar

ea.

Abs

ent.

Hab

itat i

s no

t pre

sent

at p

roje

ct s

ite.

San

Bru

no e

lfin

butte

rfly

(Inci

salia

mos

sil b

ayen

sis)

FE

/--

Val

ley

& fo

othi

ll gr

assl

and

Coa

stal

, mou

ntai

nous

are

as w

ith g

rass

y gr

ound

co

ver,

mai

nly

in th

e vi

cini

ty o

f San

Bru

no

Mou

ntai

n, S

an M

ateo

Cou

nty.

Abs

ent.

Hab

itat i

s no

t pre

sent

at p

roje

ct s

ite.

Amph

ibian

s

Cal

iforn

ia ti

ger s

alam

ande

r (A

mby

stom

a ca

lifor

nien

se)

FT/ S

T V

erna

l or t

empo

rary

poo

ls in

ann

ual g

rass

land

s,

or o

pen

stag

es o

f woo

dlan

ds. T

ypic

ally

adu

lts

use

mam

mal

bur

row

s.

The

spec

ies

occu

rs fr

om P

etal

uma

in S

onom

a C

ount

y, e

ast t

o Y

olo

and

Sac

ram

ento

Cou

ntie

s,

sout

h to

Tul

are

Cou

nty,

and

from

the

San

Fr

anci

sco

Bay

sou

th to

San

ta B

arba

ra C

ount

y.

Hig

h Po

tent

ial:

Cat

tail

Pon

d in

Syc

amor

e G

rove

Par

k on

e-ha

lf m

ile fr

om p

roje

ct s

ite

prov

ides

sui

tabl

e br

eedi

ng h

abita

t for

this

sp

ecie

s. D

ispe

rsin

g in

divi

dual

s m

ay

inad

verte

ntly

wan

der o

nto

the

wor

k ar

ea.

Cal

iforn

ia re

d-le

gged

frog

(R

ana

dray

toni

i) FT

/ CS

C

Stre

ams,

fres

hwat

er p

ools

, and

pon

ds w

ith

over

hang

ing

vege

tatio

n. A

lso

foun

d in

woo

ds

adja

cent

to s

tream

s. R

equi

res

perm

anen

t or

ephe

mer

al w

ater

sou

rces

suc

h as

rese

rvoi

rs

and

slow

mov

ing

stre

ams

and

need

s po

ols

of

>0.5

m d

epth

for b

reed

ing.

His

toric

al ra

nge

is S

acra

men

to V

alle

y ea

st in

to

the

Sie

rra N

evad

a fo

othi

lls.

Hig

h Po

tent

ial:

Cat

tail

Pon

d in

Syc

amor

e G

rove

Par

k on

e-ha

lf m

ile fr

om p

roje

ct s

ite

prov

ides

sui

tabl

e br

eedi

ng h

abita

t for

this

sp

ecie

s. D

ispe

rsin

g in

divi

dual

s m

ay

inad

verte

ntly

wan

der o

nto

the

wor

k ar

ea.

Foot

hill

yello

w-le

gged

frog

(R

ana

boyl

ii)

--/C

SC

B

reed

s an

d ov

erw

inte

rs in

and

nea

r cob

bled

st

ream

s w

ith p

erm

anen

t wat

er

Nea

rest

occ

urre

nces

are

ass

ocia

ted

with

rock

y,

pere

nnia

l stre

ams,

gre

ater

than

5 m

iles

from

pr

ojec

t site

s.

Abs

ent.

Hab

itat n

ot p

rese

nt o

n si

te o

r in

vici

nity

.

Fish

S

teel

head

- Cal

iforn

ia C

oast

ES

U

(Onc

orhy

nchu

s m

ykis

s)

FT/--

A

quat

ic s

tream

s an

d dr

aina

ges.

D

rain

ages

of S

an F

ranc

isco

and

San

Pab

lo

Bay

s, c

entra

l Cal

if. C

oast

al d

rain

ages

. A

bsen

t. H

abita

t not

pre

sent

with

in th

e pr

ojec

t si

te a

nd n

ot fo

und

in s

urve

ys in

nea

rby

drai

nage

s.

Rept

iles

Wes

tern

pon

d tu

rtle

(Act

inem

ys m

arm

orat

a)

--/C

SC

P

onds

, mar

shes

, riv

ers,

stre

ams,

and

irrig

atio

n di

tche

s w

ith a

quat

ic v

eget

atio

n <6

,000

' in

elev

atio

n. R

equi

re b

aski

ng s

ites

and

upla

nd

habi

tat f

or e

gg la

ying

(san

dy b

anks

and

ope

n,

gras

sy fi

elds

)

Wes

tern

Cal

iforn

ia in

clud

ing

coas

t ran

ges

and

the

Cen

tral V

alle

y.

Mod

erat

e Po

tent

ial.

Like

ly to

occ

ur a

t pon

d in

S

ycam

ore

Gro

ve P

ark

one-

half

mile

from

pro

ject

si

te.

App

endi

x B

TAB

LE B

.1 (C

ON

TIN

UED

) LI

STED

AN

D S

PEC

IAL-

STA

TUS

SPEC

IES

CO

NSI

DER

ED F

OR

DEL

VAL

LE W

ATE

R T

REA

TMEN

T PL

ANT

UPG

RA

DE

Del

Val

le W

ater

Tre

atm

ent P

lant

Ozo

natio

n Pr

ojec

t B

-4

ES

A /

1604

63.0

6 In

itial S

tudy

/ M

itiga

ted

Neg

ativ

e D

ecla

ratio

n Ju

ly 2

017

Nam

e

List

ing

Stat

us

Gen

eral

Hab

itat R

equi

rem

ents

O

ccur

renc

e

Pote

ntia

l for

Spe

cies

Occ

urre

nce

W

ithin

the

Surv

ey A

rea

Rept

iles (

cont

.) Al

amed

a w

hips

nake

(M

astic

ophi

s la

tera

lis e

uryx

anth

us)

FT/S

T C

oast

al ra

nges

, in

chap

arra

l and

ripa

rian

habi

tat

and

adja

cent

gra

ssla

nds

Lim

ited

to c

oast

al s

crub

and

oak

com

mun

ities

of

East

Bay

in C

ontra

Cos

ta, A

lam

eda,

and

par

ts o

f Sa

n Jo

aqui

n an

d Sa

nta

Cla

ra C

ount

ies.

Abs

ent.

Hab

itat f

or th

is s

peci

es d

oes

not o

ccur

in

the

vici

nity

of t

he p

roje

ct s

ite.

Bird

s

Tric

olor

ed b

lack

bird

(A

gela

ius

trico

lor)

--/S

C

Nes

ts in

fres

hwat

er m

arsh

es w

ith d

ense

sta

nds

of c

atta

ils o

r bul

rush

es, o

ccas

iona

lly in

will

ows,

th

istle

s, m

usta

rd, b

lack

berr

y br

ambl

es, a

nd

dens

e sh

rubs

and

gra

ins.

Req

uire

s op

en w

ater

, pr

otec

ted

area

s fo

r nes

ts, f

orag

ing

habi

tat w

ith

inse

cts.

Sac

ram

ento

-San

Joa

quin

Riv

er D

elta

, M

onte

rey

and

Mar

in c

ount

ies,

and

coa

stal

la

goon

s fro

m S

onom

a to

San

Die

go C

ount

ies

durin

g w

inte

r. La

rge

bree

ding

col

onie

s oc

cur i

n C

entra

l Val

ley.

Low

pot

entia

l. B

reed

ing

habi

tat d

oes

not e

xist

in

vic

inity

of s

ite. M

ay o

ccur

with

red-

win

ged

blac

kbird

s in

adj

acen

t par

k w

etla

nds.

Bur

row

ing

owl

(Ath

ene

cuni

cula

ria)

--/C

SC

(b

urro

win

g si

tes)

Nes

ts a

nd fo

rage

s in

low

-gro

win

g gr

assl

ands

w

ith b

urro

win

g m

amm

als

Inte

rior a

reas

of S

an F

ranc

isco

Bay

, with

larg

er

num

bers

in A

lam

eda,

Con

tra C

osta

, and

San

ta

Cla

ra c

ount

ies.

Abs

ent.

Ther

e ar

e no

bur

row

s at

the

site

s th

at

coul

d su

ppor

t nes

ting

burro

win

g ow

ls a

nd th

is

spec

ies

has

not b

een

obse

rved

in th

e pr

ojec

t vi

cini

ty.

Whi

te-ta

iled

kite

(E

lanu

s le

ucur

us)

--/C

FP

Nes

ts in

shr

ubs

and

trees

adj

acen

t to

gras

slan

ds, f

orag

es o

ver g

rass

land

s an

d ag

ricul

tura

l lan

ds

Wid

espr

ead

acro

ss C

alifo

rnia

and

the

Uni

ted

Sta

tes.

Lo

w P

oten

tial.

Pot

entia

l for

agin

g ha

bita

t in

adja

cent

par

k.

Cal

iforn

ia le

ast t

ern

(Ste

rnul

a an

tilla

rum

bro

wni

) FE

/SE

C

olon

ial b

reed

er o

n ba

re o

r spa

rsel

y ve

geta

ted,

fla

t sub

stra

tes:

san

d be

ache

s, a

lkal

i fla

ts,

land

fills

, or p

aved

are

as.

Nes

ts a

long

the

coas

t fro

m S

an F

ranc

isco

Bay

so

uth

to n

orth

ern

Baj

a C

alifo

rnia

. A

bsen

t. H

abita

t not

pre

sent

on

proj

ect s

ite o

r in

imm

edia

te v

icin

ity.

Mam

mals

P

allid

bat

(A

ntro

zous

pal

lidus

) C

SC

G

rass

land

s, s

hrub

land

s, w

oodl

ands

, and

fo

rest

s. C

omm

on in

arid

regi

ons

with

rock

y ou

tcro

ppin

gs, p

artic

ular

ly n

ear w

ater

. Roo

sts

in

rock

cre

vice

s, b

uild

ings

, and

und

er b

ridge

s.

Brit

ish

Col

ombi

a to

wes

t Tex

as, B

aja,

and

C

entra

l Mex

ico

Low

pot

entia

l. P

roje

ct s

ite lo

cate

d in

hig

hly

dist

urbe

d ar

eas

whi

ch w

ould

det

er th

is s

peci

es

from

roos

ting.

Tow

nsen

d’s

big-

eare

d ba

t (C

oryn

orhi

nus

tow

nsen

dii)

--/

ST

Thro

ugho

ut C

alifo

rnia

in a

wid

e va

riety

of

habi

tats

. Roo

sts

in th

e op

en, h

angi

ng fr

om w

alls

&

cei

lings

.

Thro

ugho

ut C

alifo

rnia

in a

wid

e va

riety

of

habi

tats

. Lo

w p

oten

tial.

Pro

ject

site

loca

ted

in h

ighl

y di

stur

bed

area

s w

hich

wou

ld d

eter

this

spe

cies

fro

m ro

ostin

g.

San

Joa

quin

kit

fox

(Vul

pes

mac

rotis

mut

ica)

FE

/ST

Und

evel

oped

gra

ssla

nds

and

agric

ultu

ral l

and.

P

atch

ily d

istri

bute

d in

the

Dia

blo

Ran

ge a

nd

sout

h to

Bak

ersf

ield

A

bsen

t. H

abita

t doe

s no

t occ

ur a

t pro

ject

site

.

Hoa

ry b

at

(Las

iuru

s ci

nere

us)

WB

WG

M

ediu

m

Fore

sted

hab

itats

and

tree

s al

ong

clea

ring

edge

s. R

oost

s in

tree

s w

ith d

ense

folia

ge.

Fora

ges

in tr

ees

and

alon

g st

ream

s an

d la

ke

shor

es.

Wid

espr

ead

acro

ss C

alifo

rnia

Lo

w p

oten

tial.

Pot

entia

l roo

stin

g an

d fo

ragi

ng

habi

tat i

n ad

jace

nt p

ark.

App

endi

x B

TAB

LE B

.1 (C

ON

TIN

UED

) LI

STED

AN

D S

PEC

IAL-

STA

TUS

SPEC

IES

CO

NSI

DER

ED F

OR

DEL

VAL

LE W

ATE

R T

REA

TMEN

T PL

ANT

UPG

RA

DE

Del

Val

le W

ater

Tre

atm

ent P

lant

Ozo

natio

n Pr

ojec

t B

-5

ES

A /

1604

63.0

6 In

itial S

tudy

/ M

itiga

ted

Neg

ativ

e D

ecla

ratio

n Ju

ly 2

017

Nam

e

List

ing

Stat

us

Gen

eral

Hab

itat R

equi

rem

ents

O

ccur

renc

e

Pote

ntia

l for

Spe

cies

Occ

urre

nce

W

ithin

the

Surv

ey A

rea

Mam

mals

(con

t.)

Yum

a m

yotis

(M

yotis

yum

anen

sis)

W

BW

G

Low

G

roup

s ro

ost i

n ca

ves,

tree

s, c

liff c

revi

ces,

m

ines

, and

und

er b

ridge

s. F

orag

es o

ver w

ater

an

d th

us li

ves

near

pon

ds a

nd ri

vers

.

Wid

espr

ead

acro

ss C

alifo

rnia

Lo

w p

oten

tial.

Pot

entia

l roo

stin

g an

d fo

ragi

ng

habi

tat i

n ad

jace

nt p

ark.

Plan

ts

P

alm

ate

salty

bird

’s-b

eak

(Chl

orop

yron

pal

mat

um)

FE/S

E/1

B.1

C

heno

pod

scru

b, v

alle

y an

d fo

othi

ll gr

assl

ands

E

ndem

ic to

Cal

iforn

ia. O

ccur

renc

es in

Cen

tral

Val

ley

north

of S

acra

men

to a

nd w

est o

f Yub

a C

ity. L

ocal

pop

ulat

ions

lim

ited

to a

lkal

i sca

lds

at

the

Spr

ingt

own

Alk

ali P

rese

rve.

Abs

ent.

Alk

alin

e ha

bita

t not

pre

sent

on

proj

ect

site

or i

n im

med

iate

vic

inity

.

Alk

ali m

ilk-v

etch

(A

stra

galu

s te

ner v

ar. t

ener

) --/

--/1

B.2

A

lkal

i pla

ya, v

alle

y an

d fo

othi

ll gr

assl

and

(ado

bo

clay

), ve

rnal

poo

l, w

etla

nd.

End

emic

to C

alifo

rnia

. Occ

urre

nces

in g

reat

er

San

Fra

ncis

co B

ay A

rea

incl

udin

g Li

verm

ore

area

, Nap

a R

iver

, and

from

Sui

sun

Bay

nor

th to

gr

eate

r Dav

is a

rea.

Abs

ent.

Alk

alin

e ha

bita

t not

pre

sent

on

proj

ect

site

or i

n im

med

iate

vic

inity

.

Hea

rtsca

le

(Atri

plex

cor

dula

ta v

ar. c

ordu

lata

) -/-

-/1B

.2

Sal

ine

or a

lkal

ine

habi

tat i

nclu

ding

che

nopo

d sc

rub,

mea

dow

and

see

p, a

nd v

alle

y an

d fo

othi

ll gr

assl

and

End

emic

to C

alifo

rnia

. Occ

urre

nces

in C

entra

l V

alle

y, E

ast S

an F

ranc

isco

Bay

in L

iver

mor

e ar

ea. A

lso

in C

ontra

Cos

ta, S

olan

o, B

utte

, C

olus

a, F

resn

o, S

tani

slau

s, G

lenn

, Ker

n,

Mad

era,

Mer

ced,

and

San

Lui

s O

bisp

o C

ount

ies.

Abs

ent.

Sal

ine

or a

lkal

ine

habi

tat n

ot p

rese

nt o

n pr

ojec

t site

or i

n im

med

iate

vic

inity

.

Brit

tlesc

ale

(Atri

plex

dep

ress

a)

--/--

/1B

.2

Alk

ali p

laya

, che

nopo

d sc

rub,

mea

dow

and

se

ep, v

alle

y an

d fo

othi

ll gr

assl

and,

ver

nal p

ool,

wet

land

.

End

emic

to C

alifo

rnia

. Occ

urre

nces

in g

reat

er

San

Fra

ncis

co B

ay A

rea

incl

udin

g Li

verm

ore

area

. Occ

urs

in C

ontra

Cos

ta, S

olan

o, C

olus

a,

Fres

no, G

lenn

, Ker

n, M

erce

d, S

tani

slau

s,

Tula

re, a

nd Y

olo

Cou

ntie

s.

Abs

ent.

Alk

alin

e ha

bita

t not

pre

sent

on

proj

ect

site

or i

n im

med

iate

vic

inity

.

Less

er s

alts

cale

(A

tripl

ex m

inus

cula

) --/

--/1

B.1

C

heno

pod

scru

b, a

lkal

i pla

ya, v

alle

y an

d fo

othi

ll gr

assl

and.

E

ndem

ic to

Cal

iforn

ia. O

ccur

renc

es in

Li

verm

ore

area

. Als

o oc

curs

in A

lam

eda,

But

te,

Fres

no, K

ern,

Mad

era,

Mer

ced,

and

Tul

are

Cou

ntie

s.

Abs

ent.

Alk

alin

e ha

bita

t not

pre

sent

on

proj

ect

site

or i

n im

med

iate

vic

inity

.

San

Joa

quin

spe

arsc

ale

(Atri

plex

joaq

uina

na)

--/--

/1B

.2

Che

nopo

d sc

rub,

mea

dow

and

see

p, a

lkal

i m

eado

w, p

laya

, val

ley

and

foot

hill

gras

slan

d E

ndem

ic to

Cal

iforn

ia. O

ccur

renc

es in

Eas

t San

Fr

anci

sco

Bay

in L

iver

mor

e ar

ea. A

lso

in

Con

tra C

osta

, Sol

ano,

Nap

a, M

onte

rey,

Fr

esno

, Col

usa,

Gle

nn, M

erce

d, S

an B

enito

, an

d Yo

lo C

ount

ies.

Abs

ent.

Alk

alin

e ha

bita

t not

pre

sent

on

proj

ect

site

s or

in im

med

iate

vic

inity

.

Dia

blo

helia

nthe

lla

(Hel

iant

hella

cas

tane

a)

--/--

/1B

Fo

rest

, woo

dlan

d, c

hapa

rral,

coas

tal s

crub

, rip

aria

n w

oodl

and,

and

gra

ssla

nd; u

sual

ly in

ch

apar

ral/o

ak w

oodl

and

ecot

one.

San

Fra

ncis

co B

ay A

rea

mos

tly a

roun

d M

ount

D

iabl

o pr

oper

A

bsen

t. P

roje

ct s

ite d

oes

not c

onta

in p

refe

rred

ha

bita

t and

is h

ighl

y di

stur

bed

and

dom

inat

ed

with

non

-nat

ive

vege

tatio

n.

App

endi

x B

TAB

LE B

.1 (C

ON

TIN

UED

) LI

STED

AN

D S

PEC

IAL-

STA

TUS

SPEC

IES

CO

NSI

DER

ED F

OR

DEL

VAL

LE W

ATE

R T

REA

TMEN

T PL

ANT

UPG

RA

DE

Del

Val

le W

ater

Tre

atm

ent P

lant

Ozo

natio

n Pr

ojec

t B

-6

ES

A /

1604

63.0

6 In

itial S

tudy

/ M

itiga

ted

Neg

ativ

e D

ecla

ratio

n Ju

ly 2

017

Nam

e

List

ing

Stat

us

Gen

eral

Hab

itat R

equi

rem

ents

O

ccur

renc

e

Pote

ntia

l for

Spe

cies

Occ

urre

nce

W

ithin

the

Surv

ey A

rea

Plan

ts (c

ont.)

Pro

stra

te n

avar

retia

(N

avar

retia

pro

stra

te)

--/--

/1B

In

mes

ic, a

lkal

i are

as o

f coa

stal

scr

ub a

nd

gras

slan

d, p

artic

ular

ly v

erna

l poo

ls

Sca

ttere

d di

strib

utio

n fro

m S

an F

ranc

isco

Bay

A

rea,

thro

ugh

Tran

sver

se R

ange

s an

d P

enin

sula

r Ran

ges,

to s

outh

Cal

iforn

ia b

orde

r.

Abs

ent.

Alk

alin

e ha

bita

t not

pre

sent

on

proj

ect

site

s or

in im

med

iate

vic

inity

.

Con

gdon

’s ta

rpla

nt

(Cen

trom

adia

par

ryi s

sp.

cong

doni

i)

--/--

/1B

.1

Val

ley

and

foot

hill

gras

slan

d.

End

emic

to C

alifo

rnia

. Occ

urre

nces

in S

an

Fran

cisc

o B

ay A

rea

from

the

Sou

th B

ay

north

east

to th

e E

ast B

ay in

clud

ing

Dub

lin/P

leas

anto

n/Li

verm

ore

area

and

no

rthea

st to

Bre

ntw

ood

area

.

Abs

ent.

Alth

ough

site

sup

ports

gra

ssla

nd

habi

tat,

it is

dom

inat

ed b

y no

n-na

tive

spec

ies

and

this

pla

nt w

as n

ot o

bser

ved

on s

ite.

Sal

ine

clov

er

(Trif

oliu

m h

ydro

philu

m)

--/--

/1B

.2

Mar

shes

and

sw

amps

, mes

ic a

nd a

lkal

ine

valle

y an

d fo

othi

ll gr

assl

ands

(mes

ic, a

lkal

ine)

, ver

nal

pool

s.

Gre

ater

San

Fra

ncis

co B

ay A

rea

incl

udin

g th

e N

orth

Bay

, the

Eas

t Bay

, the

Sou

th B

ay a

roun

d S

an J

ose,

eas

t to

Sac

ram

ento

and

Sto

ckto

n,

and

area

s ar

ound

Sal

inas

, and

Mon

tere

y.

Abs

ent.

Sal

ine

habi

tat n

ot p

rese

nt o

n pr

ojec

t si

tes

or in

imm

edia

te v

icin

ity.

Cap

er-fr

uite

d tro

pido

carp

um

Trop

idoc

arpu

m c

appa

rideu

m

--/--

/1B

.1

Val

ley

and

foot

hill

gras

slan

d al

kalin

e hi

lls.

End

emic

to C

alifo

rnia

. Occ

urs

in C

entra

l Val

ley

arou

nd F

resn

o, in

Cen

tral C

oast

nea

r San

Lui

s O

bisp

o an

d no

rth o

f Lak

e S

an A

nton

io.

Abs

ent.

Pre

sum

ed e

xtirp

ated

from

Liv

erm

ore

and

surro

undi

ng a

reas

.

STA

TUS

CO

DE

S:

US

FWS

(U.S

. Fis

h an

d W

ildlif

e S

ervi

ce)

FE =

Lis

ted

as E

ndan

gere

d by

the

Fede

ral G

over

nmen

t FT

= L

iste

d as

Thr

eate

ned

by th

e Fe

dera

l Gov

ernm

ent.

C

DFW

(Cal

iforn

ia D

epar

tmen

t of F

ish

and

Wild

life)

S

E =

Lis

ted

as E

ndan

gere

d by

the

Stat

e of

Cal

iforn

ia

ST

= Li

sted

as

Thre

aten

ed b

y th

e S

tate

of C

alifo

rnia

S

C =

Can

dida

te T

hrea

tene

d by

the

Stat

e of

Cal

iforn

ia

CS

C =

Cal

iforn

ia S

peci

es o

f Spe

cial

Con

cern

C

FP =

Cal

iforn

ia F

ully

Pro

tect

ed S

peci

es

CA

LIFO

RN

IA N

ATI

VE

PLA

NT

SO

CIE

TY (C

NP

S) R

AR

E P

LAN

T R

AN

K:

Ran

k 1A

: Pla

nts

pres

umed

ext

inct

. R

ank

1B: P

lant

s ra

re, t

hrea

tene

d, o

r end

ange

red

in C

alifo

rnia

and

els

ewhe

re.

Ran

k 2:

Pla

nts

rare

, thr

eate

ned,

or e

ndan

gere

d in

Cal

iforn

ia, b

ut m

ore

num

erou

s el

sew

here

. P

OTE

NTI

AL

TO O

CC

UR

CA

TEG

OR

IES

: A

bsen

t = T

he p

roje

ct a

reas

and

/or i

mm

edia

te v

icin

ities

do

not s

uppo

rt su

itabl

e ha

bita

t for

a p

artic

ular

spe

cies

. Pro

ject

are

as m

ay b

e ou

tsid

e of

the

spec

ies’

kno

wn

rang

e.

Low

Pot

entia

l = T

he p

roje

ct a

reas

and

/or i

mm

edia

te v

icin

ities

onl

y pr

ovid

e lim

ited

habi

tat.

In a

dditi

on, t

he s

peci

es’ k

now

n ra

nge

may

be

outs

ide

of th

e pr

ojec

t are

as.

Mod

erat

e P

oten

tial =

The

pro

ject

are

as a

nd/o

r im

med

iate

vic

initi

es p

rovi

de s

uita

ble

habi

tat.

Hig

h P

oten

tial =

The

pro

ject

are

as a

nd/o

r im

med

iate

vic

inity

pro

vide

idea

l hab

itat c

ondi

tions

or t

he s

peci

es h

as b

een

obse

rved

. S

OU

RC

ES

: CD

FW 2

017;

CN

PS

2017

; US

FWS

2017

Date post:	20-Mar-2020
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DEL VALLE WATER TREATMENT PLANT OZONATION PROJECTWater Agency” or “Zone 7”), acting as the...

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