Orange County, NYWater Supply Development and NYSDOS Grant Funding2013 NYC Watershed/Tifft – Science & Technology Symposium
September 19, 2013
Orange County Department of Planning in association with Orange County Water Authority and Orange County Department of Public Works
Acknowledgements
Co-authors: • Michael Principe - HDR• David Church - OCWA Orange County Department of
Planning in association with the OCWA and Orange County DPW: Pete Hammond
Town of Crawford• Supervisor Charles Carnes• Tom Mckelvey, Water
Superintendent NYSDOS Local Gov’t Efficiency
Grant: Contract C-078842
Studies
Study Date Comments
1. Orange County Water Master Plan
August 2010 Encouraged municipal water sharing. Mid-County region of the County needs a water sharing plan
2. Mid-County Water Supply Feasibility Study
January 2012 Dwaarkill-Pine Bush (Town of Crawford) Water Supply selected for advancement to the feasibility analysis stage
December 2012 Dwaar Kill – Pine Bush Water Supply Project Facility PlanDevelop facility plan for the development of a conceptual design of a water supply, treatment, and conveyance system
The Need For Regional Water Sharing
The Village of Pine Bush currently utilizes groundwater as its potable water source
Current supply has water quality problems
Current demand during drought exceeds the current supply
Current supply insufficient for future demands
System requires improved system reliability
Inter-municipal Relationship
Pine Bush Central School District
Town of Crawford
Orange County
Pine Bush Water District
Project Area
Town of Crawford is part of the Mid-County region of Orange County
Village of Pine Bush is a hamlet inside the Town of Crawford
Current Water Supply Conditions in Village of Pine Bush Water District Demands:
Average water demand is approximately 200,000 gpd (140 gpm)
Maximum Daily Demand approaches 370,000 gpd (257 gpm)
Service Area: Supply serves a population of
2,100 people plus a central school system of 5,650 individuals
Water Supply Water District has five (5)
approved wells, with four wells typically operational.
Project Area
Dwaar Kill – Pine Bush Water Supply Facility Plan: Project Objectives
1. Perform Preliminary Testing of the Dwaar Kill Well Field relating to water quality and safe yield
2. Assess routing alternatives to achieve inter-municipal water sharing and distribution system connections
3. Develop conceptual water treatment alternatives for the developed well field
4. Review wastewater disposal options5. Assess project financing and funding
alternatives and associated institutional arrangements
Project Challenges &Why You May Find This Presentation Interesting
Treatment system challenges
The approach to find the best interconnection with the least amount of obstructions or impacts to the environment
How to deal with disposal when there are limited viable options
Leveraging project funding
Dwaar Kill Well Field Background Wells 2 through 5 were tested
simultaneously at a total rate of 445 gpm
Drawdown data was compiled for each well & wells at nearby residences
Testing proved that the maximum daily demand could be achieved with wells 2 through 5
However, some mitigating measures must be employed to address the impacts to nearby residential wells:
deepening/replacing the existing wells or
connecting impacted residents to the municipal water system.
Dwaar Kill Well Field Water Quality Testing
Initial water quality testing was performed in 2008 by SSEC Inc.
Additional testing performed in 2010
Well ID Fe(mg/L)
Mn(mg/L)
Fe and Mn
(mg/L)
Na(mg/L)
Hardness(mg/L as CaCO3)
VOCs (ug/L)
2 0.25 0.17 0.42 25.4 166 ND3 0.16 0.09 0.25 10.4 162 ND4 0.66 0.17 0.83 11.9 164 ND5 0.08 0.12 0.20 16.3 176 ND
Well ID Fe(mg/L)
Mn(mg/L)
Fe and Mn
(mg/L)
Na(mg/L)
Hardness(mg/L as CaCO3)
VOCs (ug/L)
MPA (EPA Risk
Factor)
2 0.24 0.14 0.38 29 200 ND 0 (low)3 0.08 0.18 0.26 9 160 ND 0 (low)4 0.41 0.57 0.98 9 160 ND 0 (low)5 0.08 0.08 0.16 12 155 ND 0 (low)
MCL=0.3 mg/L =0.5 mg/L
DWEL=20 mg/L
Selection of Treatment Method
All of the wells in the Dwaar Kill wellfield show the presence of Fe and Mn– Fe and Mn > MCL – require method for Fe and Mn
removal– Fe and Mn < MCL – require sequestering agent to
limit color issues Green sand filtration chosen as the treatment
method for this process
Selection of Treatment Method
Green Sand Filtration = Operator Friendly– doesn’t require modified chemical dosing for varied
concentrations & flows
Process Flow Diagram
PermanganateAbsorbs and removes Fe & Mn
Hypochlorite-oxidizes-continuouslyregeneratefilters
WTP Siting
Disposal Options Recycle
(Source: source: elkhorn.unl.edu)
Sewage Lagoon
Outfall to Dwaar Kill
Connect to Sanitary Sewer System
Sewage Lagoon Investigation
(Source: source: elkhorn.unl.edu)
Disposal Options
“Red Water” recycle– Recycle from decant tank at rate of 10% of influent– Requires OCDOH approval for recycle and use as makeup
water Outfall– Discharge to Dwaar Kill – a 22.3 mi tributary to the Wallkill
River Sanitary Sewer– Discharge to closest sanitary sewer results in miles of
pipeline installation
Pine Bush Water DistrictWater Distribution System
Project Area
Distribution and Transmission System
Distribution and Transmission System
Distribution and Transmission System Obstacles - Constructability
Constructability issues
Distribution and Transmission System Obstacles - Utilities
Utility conflicts
Distribution and Transmission System Obstacles - Environmental
Permitting efforts/wetland Impacts
Distribution and Transmission System Obstacles Environmental
Permitting efforts/wetland Impacts
Distribution and Transmission System Obstacles - Environmental
Permitting efforts/wetland Impacts
Agency Permit/ApprovalNYSDOH/OCDOH DOH-348 Application for Approval of Plans for Public Water Supply
ImprovementsUSACE Jurisdictional Determination
Nationwide Permit (likely)NYSDEC Wetland verification
SEQRA – Unlisted Action401 Water Quality CertificationArticle 24 Freshwater wetlands (potential buffer-only disturbance)Article 15 Protection of Waters (potential)SWPPP – SPDES General PermitSPDES Article 17 Permit
NYSDOT Highway Work Permit – NYS Route 52Orange County Road Opening Permit – Hill Avenue (County Road No. 52)
Town of Crawford Site Plan Approval – Planning Board review (likely)Building PermitRoad Opening Permit – Blackhawk Road
Permitting
Project Financing
County OCWA Local CommunityProvides backing to OCWA bonds
Sells debt/proceeds to local community
Installs/maintains local water mains
Optimizes cost of borrowing
Owns the assets Leases assets from the OCWA
Provides oversight Receives payments from local community
Operates/maintains plant & major pipes
Pays debt service to bondholders Pays for O&M Provides oversight Pays OCWA for debt service
Designs/builds water treatment & major pipes
Sets rates/bills local customers/collects payments
Maintains customer relationships
Project Financing
OCWA, Town of Crawford, Orange County Legislature and Pine Bush School Central District are in the process of passing resolutions to form as Dwaar Kill-Pine Bush Municipal Water Alliance
Resolutions as 4 separate jurisdictions to support the joint application for the LGEG Program Inter-municipal agreement required Core expectation for reducing costs and increasing efficiency $800,000 LGEG application submitted
Pine Bush Central School District
Town of Crawford
Orange County
Pine Bush Water District
Final Point of Interest
Thank You….. Questions?
Any questions, please contact :
Ginger Modafferi , PEAssociate/Project Manager
