Arlington, Virginia WATER AND SEWER INFRASTRUCTURE PROGRAMS Program Description This program provides and maintains water delivery, sanitary sewer collection, and wastewater treatment systems that provide high quality water and sewer services and products. This program has been established to ensure that water and sewer services are available to all residents in Arlington's service area and that the Water Pollution Control Plant (WPCP) meets model discharge standards. Program Summary The Capital Improvement programs for the water distribution and sanitary sewer collection systems provide funding for both expansion of capacity for the future growth of Arlington County and the preservation of assets through rehabilitation and replacement (maintenance). Expansion projects typically increase capacity while assets are preserved through the non- expansion category. The programs are categorized into three areas: water expansion, sewer expansion, and water/sewer maintenance capital. The water and sewer expansion programs focus on projects required to provide for the future projected land use in Arlington County by the year 2040. Estimation of the maximum expected land use development in the county, termed "build out," based on the land use types and densities in the County land use plans is used to determine water and sewer demand. The expansion projects are identified and prioritized in the Water Distribution System Master Plan and the Sanitary Sewer Collection System Master Plan. The Water System Master Plan was adopted by the County Board in September 2014. The Sanitary Sewer System Master Plan was last updated in 2002 and is currently being updated with targeted completion during Fiscal Year 2017. Some of the water projects identified in the Water Distribution System Master Plan have already been programmed into the CIP, including the Gravity Transmission Mains, Minor Hill Yard Piping, North Edison Street and a number of smaller projects. Projects identified in the Sewer Collection System Master Plan and included in this CIP include the Potomac Interceptor Phase II, Spout Run and a number of smaller projects. Both the water and sewer expansion projects are typically in the CIP for a number of years to build up funding for construction. When projects are initially funded, an alignment study is done. Funding in later years provides for preliminary engineering, final design and construction. With each step of the process the scope of the projects and funding needs become more defined. The Maintenance Capital program focuses on projects that rehabilitate and replace existing water distribution and sanitary sewer collection infrastructure. The programs for maintenance capital are outlined in the Water Distribution System and the Sanitary Sewer Collection System Master Plans. This is done for the water distribution system by programs that clean and line water mains, rehabilitate and replace valves, and rehabilitate water storage tanks. The Water Distribution Master plan recommends replacement and rehabilitation of water mains based on asset management best practices. The requested funding will be modified as more data is collected and analyzed on the condition of water mains over future CIP's. The sanitary sewer collection system is addressed by programs that rehabilitate and replace sewer mains under the infiltration and inflow program, rehabilitate large diameter sewer mains, and replace gravity sewers and sewer force mains. Other categories in this program pay Arlington County's share of the capital expenses at the Washington Aqueduct, enhance our water meter reading capabilities, and fund the acquisition of a new and upgraded technology such as asset management, work order, utility billing and project tracking for the water distribution and sewer collection systems. The Water Pollution Control Bureau (WPCB) Capital Improvement Program directly supports Arlington's vision for a world class sustainable community as well as the Bureau's mission of safely and cost-effectively protecting the public health and environment. The 10-year program provides for planning to secure a world class wastewater treatment facility that enhances attractive residential neighborhoods, and promotes an environmentally friendly, sustainable community. This program encompasses both expansion and non-expansion projects. The expansion and non-expansion Capital Improvement programs for the Water Pollution Control Plant (WPCP) and wastewater lift/metering stations systems provide funding for both F - 1
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Arlington, Virginia
WATER AND SEWER INFRASTRUCTURE PROGRAMS
Program Description This program provides and maintains water delivery, sanitary sewer collection, and wastewater treatment systems that provide high quality water and sewer services and products. This program has been established to ensure that water and sewer services are available to all residents in Arlington's service area and that the Water Pollution Control Plant (WPCP) meets model discharge standards. Program Summary The Capital Improvement programs for the water distribution and sanitary sewer collection systems provide funding for both expansion of capacity for the future growth of Arlington County and the preservation of assets through rehabilitation and replacement (maintenance). Expansion projects typically increase capacity while assets are preserved through the non-expansion category. The programs are categorized into three areas: water expansion, sewer expansion, and water/sewer maintenance capital. The water and sewer expansion programs focus on projects required to provide for the future projected land use in Arlington County by the year 2040. Estimation of the maximum expected land use development in the county, termed "build out," based on the land use types and densities in the County land use plans is used to determine water and sewer demand. The expansion projects are identified and prioritized in the Water Distribution System Master Plan and the Sanitary Sewer Collection System Master Plan. The Water System Master Plan was adopted by the County Board in September 2014. The Sanitary Sewer System Master Plan was last updated in 2002 and is currently being updated with targeted completion during Fiscal Year 2017. Some of the water projects identified in the Water Distribution System Master Plan have already been programmed into the CIP, including the Gravity Transmission Mains, Minor Hill Yard Piping, North Edison Street and a number of smaller projects. Projects identified in the Sewer Collection System Master Plan and included in this CIP include the Potomac Interceptor Phase II, Spout Run and a number of smaller projects. Both the water and sewer expansion projects are typically in the CIP for a number of years to build up funding for construction. When projects are initially funded, an alignment study is done. Funding in later years provides for preliminary engineering, final design and construction. With each step of the process the scope of the projects and funding needs become more defined. The Maintenance Capital program focuses on projects that rehabilitate and replace existing water distribution and sanitary sewer collection infrastructure. The programs for maintenance capital are outlined in the Water Distribution System and the Sanitary Sewer Collection System Master Plans. This is done for the water distribution system by programs that clean and line water mains, rehabilitate and replace valves, and rehabilitate water storage tanks. The Water Distribution Master plan recommends replacement and rehabilitation of water mains based on asset management best practices. The requested funding will be modified as more data is collected and analyzed on the condition of water mains over future CIP's. The sanitary sewer collection system is addressed by programs that rehabilitate and replace sewer mains under the infiltration and inflow program, rehabilitate large diameter sewer mains, and replace gravity sewers and sewer force mains. Other categories in this program pay Arlington County's share of the capital expenses at the Washington Aqueduct, enhance our water meter reading capabilities, and fund the acquisition of a new and upgraded technology such as asset management, work order, utility billing and project tracking for the water distribution and sewer collection systems. The Water Pollution Control Bureau (WPCB) Capital Improvement Program directly supports Arlington's vision for a world class sustainable community as well as the Bureau's mission of safely and cost-effectively protecting the public health and environment. The 10-year program provides for planning to secure a world class wastewater treatment facility that enhances attractive residential neighborhoods, and promotes an environmentally friendly, sustainable community. This program encompasses both expansion and non-expansion projects. The expansion and non-expansion Capital Improvement programs for the Water Pollution Control Plant (WPCP) and wastewater lift/metering stations systems provide funding for both
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expansion of capacity for the future growth of Arlington County and the preservation of assets through upgrades and timely rehabilitation or replacement, respectively. Expansion projects typically increase capacity, while assets are preserved and/or upgraded through the non-expansion category. The WPCP expansion program focuses on projects required to provide for the future projected land use in Arlington County such that sufficient capacity will be available past the year 2030. This demand was met in CY 2010 by a number of projects incorporated into the Master Plan 2001 project (MP01) that expanded the plant to the ultimate build out capacity of 40 MGD (million gallons per day). Barring regulatory changes, no further expansion projects to increase capacity are anticipated at this time, and therefore no expansion projects are anticipated in the upcoming 10-year CIP cycle. The non-expansion program focuses on projects that rehabilitate, replace, and/or upgrade existing WPCP infrastructure, including process control/automation, to ensure that the facility can safely protect the public health and the environment by reliably maintaining continuity of service and simultaneously meeting the permit requirements. For this 10-year cycle of the CIP, funding for the upgrade of three secondary clarifiers is included in the WPCP non-expansion capital program to ensure reliable treatment, minimize the probability of permit violations and bypasses, and meet the Class 1 Reliability permit requirement. Additionally, the solids handling portion of the Plant was not upgraded during MP01 and a number of pieces of equipment are well beyond their useful life and in need of timely replacement with more efficient and reliable technologies. DES staff has begun an update to the Water Pollution Control Plant Master Plan, which will include an evaluation of the age and condition of the existing solids infrastructure, a look ahead to future anticipated regulatory changes both on the solids side and for disinfection, and the development of replacement cycles for the Process Control System's hardware and software. The CIP for the solids projects has been broken into three phases, described below:
Phase I - immediate needs projects, to address currently failing infrastructure that has become costly to maintain. These projects will enter design and construction in the near term, prior to the completion of the Master Plan.
Phase II - short term needs projects, to replace infrastructure that is well beyond its useful life, but which can wait until the completion of the Master Plan, thereby benefitting from the recommendations in the report.
Phase III - long term needs projects, focusing on the long-term sustainability of the WPCP's solids handling processes, deriving the benefits of addressing any future regulatory changes while reducing the impacts on the surrounding community and increasing energy efficiency.
Also included in the non-expansion program are annual repairs and replacement of current equipment and infrastructure at the plant and 15 pumping and metering stations. Plant non-expansion capital also funds Arlington's pro-rata share of improvements to the Blue Plains wastewater treatment plant and the conveyance infrastructure.
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Arlington County, Virginia
WATER AND SEWER INFRASTRUCTURE: PROGRAM FUNDING SUMMARY CIP
Projected Additional Operating Costs (in $1,000s) Bond Financing Costs 0 0 0 292 435 776 1,013 1,084 1,084 1,054 5,738
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WATER AND SEWER INFRASTRUCTURE
WATER DISTRIBUTION WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
Program Description The major focus of the Water Distribution System 10-year capital program is implementation of the Water Master Plan. The Water Master Plan update was completed and adopted by the County Board in September 2014. Many of the County’s water mains were built in the 1930s, 1940s, and 1950s, and are approaching or at the end of their life expectancy. A number of water projects have already been programmed into the CIP to address future growth and increase the rate of water main rehabilitation/replacement to keep up with aging infrastructure. Many of the projects listed here appeared in prior CIPs, because projects are typically in the CIP for a number of years to build up funding for construction.
Master Plan Impact These projects are consistent with the plans, policies, and objectives of the Water Master Plan, originally adopted in 1992, and with an update adopted by the County Board in September 2014.
Projects Improvements for Development: This funding covers mains necessary for looping or completion of a block where the developer is only responsible for work immediately on the frontage of the site. This may also cover work to abandon existing mains and the completion of loops in prior developments. When modeling indicates a need for larger water mains, but the development requiring the extra flow is by-right, this funding may be used to do entire projects. The Water System Master Plan indicates the need for this type of funding to ensure a looped water system for redundancy and adequate transmission capacity to developments. Interconnection Improvements: Interconnection Improvements with neighboring jurisdictions provides backup feed to/from Arlington in case of emergencies. Project will provide redundancy for Arlington County's water supply in case of emergency. This is a new project for the FY 17-26 CIP. Pump Station Improvements: Upgrades the motor control center and pumps at pump stations. This is a new project for the FY 2017 - FY 2026 CIP. In the prior CIP, there was a project titled "Minor Hill Pump Station Improvement" which is part of this larger program. Gravity Transmission Mains - B1: Provide water mains to back up existing transmission capacity through our Gravity One pressure zone. B1 will provide an additional connection for the Lee Station water storage and pumping station. Exact locations for B2 and B3 unknown at this time, but will parallel the 36 inch mains traveling North-South. The current Water Distribution Master Plan identifies a project to provide a second feed to the Lee Station Water Pumping and Storage Facility. This will be a part of this proposed project that will also provide backup and additional transmission capacity through our primary pressure zone, serving Rosslyn, Clarendon, VA Square and parts of Ballston. Gravity Transmission Mains - B2 & B3: Provide water mains to back up existing transmission capacity through our Gravity One pressure zone. B1 will provide an additional connection for the Lee Station water storage and pumping station. Exact locations for B2 and B3 are unknown at this time, but will parallel the 36 inch mains traveling North-South.
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The current Water Distribution Master Plan identifies a project to provide a second feed to the Lee Station Water Pumping and Storage Facility. This will be a part of this proposed project that will also provide backup and additional transmission capacity through our primary pressure zone, serving Rosslyn, Clarendon, VA Square and parts of Ballston. Edison Street / Carlin Springs Road: Funding for 8,900 feet of 16-inch water main from North Edison and 10th Street to Arlington Boulevard to provide redundancy and improve fire flow. This project impacts various neighborhoods throughout the County. New River Crossing: Additional water main crossing of Potomac River. Initial funding to start a study of the best route to provide a backup water supply to Arlington County. This water main will provide additional capacity to help ensure an adequate water supply if the existing 48-inch main is out of service.
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Arlington County, Virginia
SANITARY SEWER SYSTEM IMPROVEMENTS: PROGRAM FUNDING
SANITARY SEWER SYSTEM IMPROVEMENTS WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
Program Description The Sanitary Sewer System Improvements Program addresses the capacity of the sanitary sewer system. There are 465 miles of sewer mains in the County’s system. These projects ensure the sewer system maintains adequate capacity to support residential and commercial growth. Infrastructure availability fees paid by developers and utility user fees fund these projects. Master Plan Impact These projects are consistent with the plans, policies, and objectives of the Sanitary Sewer Collection System Master Plan. The Master Plan was last updated in 2002 and is currently being updated with targeted completion during Fiscal Year 2017. Projects Improvements for Development: This project provides funding for small segments of sewer main installation and other work directly associated with development work. This funding covers mains necessary for completion of a block where the developer is only responsible for work immediately on the frontage of the site. This may also cover work to abandon existing mains in prior developments. When modeling indicates a need for larger sewer mains, but the development requiring the extra flow is by-right, this funding may be used to do entire projects. Spout Run: The Spout Run sewer that runs under the North Highlands neighborhood is over 100 feet deep in some areas. This sewer needs to be evaluated for the construction of a back-up sewer for redundancy and maintenance purposes. The sewer runs between Spout Run and Rosslyn. Columbia Pike/Rosslyn/Crystal City Sewers: Funding to upsize sewers for redevelopment. Projects to be identified as development occurs. Project funding has been pushed out 2 years from the prior CIP based on redevelopment phasing and other project timing within the CIP. Potomac Interceptor Phase II: This project will construct a parallel sanitary sewer to the 54-inch Potomac Interceptor located in S. Joyce Street and Army Navy Drive. The current interceptor is 54 inches in diameter along these streets, carries 40 percent of the County's sewage and has no parallel line. Phase II will provide additional capacity, and system reliability and redundancy. The newly constructed line will operate in parallel with the existing line. Project funding has been reduced from the prior CIP as staff is still determining the best path forward, scope, and appropriate timing for this project based upon the challenging alignment and location.
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Arlington County, Virginia
WATER AND SEWER MAINTENANCE CAPITAL: PROGRAM FUNDING
Water Main Replacement / Rehabilitation Project Description This program funds projects that require less engineering and/or timelier implementation than more traditional CIP projects. Projects are named as they are identified in the field. Additionally, this program replaces 4-inch mains where fire flow is an issue, and 2-inch, 1-inch and 1&1/2-inch galvanized "temporary" lines that were installed in the 1920s - 1940s as the County was developing faster than the infrastructure could keep up. These smaller lines are occasional maintenance issues, and provide poor pressure and no fire flow benefit to the system. Project Justification There are over 250 miles or more than 50% of the County's water system that falls under this category. In conjunction with the water main cleaning and lining program, this project will improve the overall condition of the County's water main assets. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $45,098
A portion of the annual funding will be from infrastructure availability fees (developer contributions).
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WATER AND SEWER INFRASTRUCTURE
WS MAINTENANCE CAPITAL WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
Water Main Cleaning and Lining Program Project Description Cleaning and cement lining of smaller diameter water mains that are 8-inches or less in diameter built before the 1960's to improve fire flow, reduce rusty incidents and extend the life of the water system. Project Justification There are over 250 miles, or more than 50% of the County's water system, that falls under the category of 8-inches or less in diameter and built before the 1960’s. In conjunction with the water main replacement program, this project will improve the overall condition of the County's water main assets. The program concentrates on areas not likely to develop significantly in the foreseeable future. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $20,640
Infiltration and Inflow Project Description This program funds the rehabilitation of the sanitary sewer system to rehabilitate aging pipes and reduce infiltration and inflow, the unplanned entrance of rain, ground or surface water into the County's sanitary sewer system, and impacts various neighborhoods throughout the County. Changes from Prior CIP FY 2017 planned expenditures increase from $3,000,000 to $3,750,000. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $35,142
A portion of the annual funding will be from infrastructure availability fees (developer contributions).
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WATER AND SEWER
INFRASTRUCTURE
WS MAINTENANCE CAPITAL WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
Washington Aqueduct Capital Project Description This program provides the County's share of funding for capital improvements to the Washington Aqueduct, the County's wholesale water supplier, which is managed by the U.S. Army Corps of Engineers. Project Justification A memorandum of understanding between DC Water, Fairfax Water, Arlington County, and the Department of the Army outlines the County's obligations in regard to the Washington Aqueduct. In addition, each customer has a Water Sales Agreement with the Washington Aqueduct. Changes from Prior CIP Current amounts reflect the Aqueduct's CIP developed during its FY 2017 Budget cycle. FY 2022 through FY 2026 includes an additional $500,000 annually as a placeholder in anticipation of alternative treatment technology being implemented. A study is currently underway to determine the appropriate technology for testing and implementation. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $27,645
Arlington's share is estimated at 16.75% of the Aqueduct's total CIP.
Program Description The Maintenance Capital program focuses on projects that rehabilitate and replace existing water distribution and sanitary sewer collection infrastructure. This is done for the sanitary system by programs that rehabilitate and replace sewer mains under the infiltration and inflow program, rehabilitate large diameter sewer mains, and replace sewer and sewer force mains. The water distribution system is addressed by programs that clean and line water mains, rehabilitate and replace valves, and rehabilitate water storage tanks. Other categories of maintenance include frames and covers, manhole rehabilitation, and enhance our technological capabilities in our Supervisory Control and Data Acquisition (SCADA) systems and Utility Information Billing System.
Projects Large Diameter Water Main & Valve Rehabilitation This program includes the rehabilitation of old (50 - 80 years) large diameter (20 - 36-inch) water mains with internal joint seals, re-linings or other innovative technologies to prolong the life of these water mains. Additionally, this program includes the rehabilitation and/or replacement of 16-inch or larger valves and pressure regulating valves on transmission mains. Although not specifically mentioned in the Water System Master Plan, projects within this program meet the "investment loss" criterion established in the Master Plan for new projects. Based upon anticipated need, priority, and existing balances, this item has been reduced from the prior CIP. Water Tank Rehabilitation This project will fund the maintenance and rehabilitation of the water storage tanks at Lee and Fort Barnard. Large Diameter Sewer Rehabilitation This program funds the rehabilitation of 15 inch and larger sanitary sewer mains to eliminate infiltration and inflow, the unplanned entrance of rain, ground or surface water into the County's sanitary sewer system. Sewer Main Replacement Program Replaces smaller diameter sewer mains by cut and cover (digging up ground installing the pipe, then refilling the ground) when lining sewer mains is not possible. Sewer Force Mains Provide replacement force mains for Donaldson Run, Gulf Run, Windy Run and other sewage lift stations. Based upon anticipated need and priority, this item has been reduced from the prior CIP.
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Water/Sewer Frames/Covers Replacement of water valve and sanitary sewer manhole covers in conjunction with repaving. Manhole Rehabilitation While this is a new line in the CIP, this is not a new project. In the previous CIP, this was funded as part of the Infiltration & Inflow (I&I) Program (sewer main lining). By splitting this out into its own project, we are able to better track how much funding we are spending on the manhole rehabilitation versus I&I. Technology Enhancements To upgrade or replace various technology, such as Supervisory Control and Data Acquisition (SCADA), Automated Meter Reading (AMR), and other systems. Utilities Information Billing System To replace the Utilities Information Billing System (UIBS), which was implemented in 1996. This system bills for water, sewer, and refuse. The project is divided into two phases. Phase I includes process mapping, requirements analysis, etc. and phase II is implementation. The start of this project was delayed from FY2016 until FY2017.
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Arlington County, Virginia
WATER POLLUTION CONTROL PLANT NON-EXPANSION: PROGRAM
WPCP Maintenance Capital Project Description The Water Pollution Control Plant (WPCP) Non-expansion Capital Program provides annually for the repair and replacement of current equipment and infrastructure at the plant and 15 stations (including 11 pumping stations, two ejector stations, and two meter stations). Major components of this program include refurbishing or replacing equipment to prevent premature failure, as well as infrastructure improvements and automating treatment processes to increase efficiency. Project Justification Maintaining existing plant assets ensures that process equipment will perform and meet or exceed its estimated useful life, and that plant performance will meet regulatory operating limits. Changes from Prior CIP FY18 through FY24 were reduced from $4 million per year to $2 million per year; the additional $2 million per year had been a placeholder for larger projects which are now being funded through the Solids Master Plan. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $22,929
Other funding includes Inter-Jurisdictional (IJ) revenue. Each IJ Partner's portion of the cost is based on its reserved capacity.
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WATER AND SEWER
INFRASTRUCTURE
WPCP NON-EXPANSION WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
Blue Plains Capital Improvements Project Description The District of Columbia Water and Sewer Authority Blue Plains Plant processes a portion of Arlington County's sewage after transmission through Fairfax County mains. The capital program funds Arlington's annual payment through Fairfax County to the Blue Plains Plant for capital improvements. It also funds improvements to the transmission system.
Project Justification Payment is due under the terms of the October 3, 1994 Sewage Conveyance, Treatment, and Disposal Agreement with Fairfax County. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $3,496
Improvements to Eads St Property Project Description Funding for improvements to a property near the Water Pollution Control Plant that the County purchased in March 2010. This facility serves as the plant's off site warehouse, and is used for storage of larger and less frequently used items. Additionally, Arlington Transit (ART) has some offices within the facility. Per a memorandum of understanding dated November 23, 2011, the Transit Bureau contributes toward the cost of the site. Project Justification Funds are required to properly maintain this facility. Occasional capital improvements will need to be made. Capital Costs during Ten Year Period (FY to FY ) (in $1,000s): $1,146
The Transit Bureau will contribute 16.8 percent of applicable capital costs at the Eads Street facility, consistent with its share of the space used there. The Inter-Jurisdictional (IJ) Partners also share in a portion of the capital costs at the facility. Both Transit Bureau and IJ Partner contributions are included in 'Other Funding'.
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WATER AND SEWER INFRASTRUCTURE
WPCP NON-EXPANSION WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
OCB HVAC Upgrades Project Description The current HVAC system is original to the building's construction in the 1970s and needs frequent maintenance. This project entails the replacement of the HVAC system at the Operations Control Building (OCB) at the Water Pollution Control Plant. This project is scheduled to be completed in FY 2018. Changes from Prior CIP Timing of expenditures has been pushed out two years from the prior CIP. The projected cost of the project has increased from the prior CIP. Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $3,500
Other funding includes Inter-Jurisdictional (IJ) revenue. Each IJ Partner's portion of the cost is based on its reserved capacity.
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WATER AND SEWER INFRASTRUCTURE
WPCP NON-EXPANSION WATER AND SEWER
INFRASTRUCTURE 2017 − 2026 CIP
Secondary Clarifiers Project Description The tanks were originally built in the 1960s and are no longer functioning as designed. Rehabilitation and / or replacement of secondary clarifiers 1, 2, and 3 is necessary to restore the tanks to full working condition and help assure compliance with the permit. After completion of the Preliminary Engineering Report, the option selected involves the rehabilitation of the existing tanks and replacement of the internal mechanisms, rather than the demolition of existing tanks and rebuilding them. Changes from Prior CIP Timing of expenditures has been pushed out two years from the prior CIP. Additionally, the cost from the prior CIP was reduced by approximately $6m based upon the option selected from the Preliminary Engineering Report.
Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $17,854
Other funding includes Inter-Jurisdictional (IJ) revenue. Each IJ Partner's portion of the cost is based on its reserved capacity. The County's portion of the project costs will be funded with PAYG and General Obligation Bonds. A portion of the bonds have already been issued and $1,355,000 is planned to be issued in 2020 from the new 2018 Referenda authority.
Solids Master Plan Phase I - Biosolids Projects Project Description The 2001 Master Plan included recommended upgrades to the solids handling processes, which were not implemented at the time due to higher priorities taking precedent. Several processes are now beyond their useful life and in need of replacement. Some potential projects include primary clarifiers internal mechanisms, scum concentrator replacement, gravity thickener upgrades, motor control center replacement in the Preliminary Treatment Building, and bar screens upgrades. The current estimate of $14.1M for these five projects is a conservative value based on the high level of unknowns at this early stage in the process. The 2016 Master Plan will include a condition assessment step, which will further refine the funding needs for these projects. The final list of projects may also include other critical infrastructure upgrades. Project Justification Solids handling processes were constructed anywhere from the 1950s to the 1990s, and many are now well beyond their useful life and difficult to maintain. Several items included in Phase I are critical to meeting the WPCP's permit, and a failure could lead to violations. In many cases, more effective technology is available that would reduce the need for maintenance and be more energy efficient. Changes from Prior CIP This project was called "Biosolids Projects" in the prior CIP. It has been renamed to reflect it is a part of the larger Solids Master Plan. Timing of expenditures has been pushed out two years from the prior CIP. Cost of total project has slightly decreased based on new matrix of proposed projects.
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $14,062
Solids Master Plan Phase II Project Description This is a new project for the FY17 - FY26 CIP. The 2016 Solids Master Plan is currently being completed and is anticipated to identify and recommend upgrades to the solids handling processes, which were not implemented at the time of the 2001 Master Plan upgrades due to higher priorities taking precedent. This second phase is for short term projects in which equipment is in need of replacement, but which can wait until the completion of the Master Plan so that any new equipment can be selected with the long-term plan in mind. This funding could also be used to rehabilitate equipment to keep it running while the long-term strategy is under design and construction. It is anticipated that these projects might include such items as the biological thickening system, sludge blending system, and the lime transfer system. The final list of projects may also include other critical infrastructure upgrades. Project Justification The solids handling processes covered under Phase II were constructed anywhere from the 1960s to the 1990s, and many are now well beyond their useful life, which makes them difficult to maintain. In many cases, more effective technology is available that would reduce the need for maintenance and be more energy efficient.
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $5,321
Solids Master Plan Phase III Project Description This is a new project for the FY17 - FY26 CIP. The Solids Master Plan is currently being completed and is anticipated to identify and recommend upgrades to the solids handling processes, which were not implemented at the time of the 2001 Master Plan upgrades due to higher priorities taking precedent. These longer term upgrades would allow us to take advantage of advances in technology that were not available at the time of the previous master plan, while being able to react more quickly to regulatory changes affecting biosolids. These upgrades, once complete, should reduce the impact of the WPCP on the adjoining civic associations, while at the same time making the WPCP more resilient to a changing regulatory environment. Additional goals for the long-term projects include use of energy-efficient equipment; reductions in greenhouse gases; and operability, maintainability, and safety of any new processes. As the Master Plan is underway, the scope and capital costs of the Phase III projects are yet to be determined, and a placeholder has been added to the CIP for this future effort. The final list of projects may also include other critical infrastructure upgrades. Project Justification Solids handling processes were constructed anywhere from the 1950s to the 1990s, and many are now well beyond their useful life. In many cases, more efficient technology is available that would reduce the need for maintenance and be more energy efficient.
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $150,000
The 2016 Solids Master Plan has not yet been completed, so these estimates are placeholders until the exact scope of projects has been determined.
Program Description The Stormwater Management capital program provides watershed restoration projects and infrastructure upgrades intended to accomplish the following goals: 1) to reduce the potential for stormwater threats to public health, safety, and property; 2) to reduce the impacts of new and existing urban development on Arlington streams, the Potomac River and the Chesapeake Bay; and 3) to comply with State and federal stormwater, water quality, and floodplain management regulations. The adopted FY 2017 - FY 2026 CIP reflects stormwater activities currently funded by a Sanitary District tax of $0.013 per $100 of assessed real property value. This tax provides the annual revenue for the Stormwater Fund which funds both stormwater related capital and operating costs. The CIP reflects stormwater capital improvement programs totaling $53.7 million over the ten year CIP cycle funded by the Stormwater Fund, with approximately $25.0 million provided by funds approved in prior CIPs or previous budget allocations. The net new funding shown in the CIP is $28.7 million.
Program Summary The stormwater management projects identified in the adopted CIP are based on the results of three comprehensive needs assessment studies completed as part of an update of the Stormwater Master Plan that was adopted by the County Board in September 2014. These studies included a storm sewer capacity analysis, a County-wide stream assessment, and watershed retrofit studies in each of the County's subwatersheds. The resulting CIP projects are organized into the following three stormwater management program areas: ENVIRONMENTAL QUALITY: This portion of the Stormwater Management Program CIP ($26.1 million for the 10 year CIP) consists of projects identified and prioritized in the Stormwater Master Plan. Projects include watershed retrofit projects to help reduce the impacts of stormwater runoff on local streams, the Potomac River, and the Chesapeake Bay. This program also includes stream restoration projects to improve stream stability and habitat and to protect infrastructure. In 2010, the EPA established the Chesapeake Bay Total Maximum Daily Load (TMDL), a comprehensive pollution budget for the Chesapeake Bay, including new accountability measures to restore clean water in the Bay and local streams and rivers. The Chesapeake Bay TMDL requires Arlington and other Municipal Separate Storm Sewer System (MS4) Permit Holders to achieve specific nutrient and sediment reductions - defined in terms of pounds of sediment, phosphorus, and nitrogen-through local stormwater management programs. As established by the Virginia Department of Environmental Quality (DEQ), Arlington must reduce its share of sediment and nutrient discharges from its storm sewer system by 5% during the current MS4 permit cycle (2013-2018), an additional 35% reduction during the second permit cycle (2018-2023), and the final 60% of the required reductions during the third permit cycle (2023-2028). The Stormwater Master Plan described the use of stream restoration projects and watershed retrofits as two key strategies to meet the Bay TMDL requirements. In addition, stringent regulation of the stormwater runoff from development/redevelopment will continue to achieve incremental and cumulative reductions in stormwater pollutants. New local stormwater regulations mandated by the State for development projects with increased pollutant reduction requirements took effect on July 1, 2014. The current MS4 permit required Arlington County to provide a more detailed plan for the current permit cycle's 5% reduction requirements. This plan, termed the Chesapeake Bay TMDL Action Plan in the permit, outlines the specific projects and programs that will be implemented during this permit cycle and was approved by the Virginia Department of Environmental Quality (DEQ) in September 2015. With projects and programs implemented since 2006 (the crediting baseline established by DEQ), Arlington County has successfully met the 5% pollution reduction requirement for this current permit cycle, with additional reductions expected by the end of the permit cycle. It is important to exceed the 5% requirement during this permit cycle to stay on pace to meet the full requirement in three permit cycles-rather than following the progressively steep implementation curve (5%, 35%, 60%). It should also be noted that EPA will be evaluating overall Bay restoration progress in 2017, and it is anticipated that there may be changes to the pollutant reduction requirements for local governments across Virginia and the Bay watershed. More reduction may be required.
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The Stormwater Master Plan also notes that nutrient credits from the County's Water Pollution Control Plant can be used to extend the deadline for the County's compliance with the TMDL load reduction requirements. However, the timeframe for when these credits may be needed will not be known until the next permit cycle and after EPA completes its progress evaluation. The Stormwater Master Plan also discusses the need for additional capital funding to implement the high priority stream restoration and watershed retrofit projects identified in the plan. At this time, the critical path to meet the TMDL requirements requires additional project delivery resources (project management, engineering, construction management) to align project delivery capacity with the current capital funding stream. An initial increase in delivery resources occurred with the FY15 budget. Additional project execution resources are still needed, including completion of a full engineering team to support the program requested for the FY17 budget. Contract resources can and will be used to supplement these needs but do not replace the need for a complete in-house engineering team to provide a baseline level of project delivery capacity. With the more aggressive pollutant load reductions required in the next 5-year permit cycle (2018-2023), and EPA's 2017 progress evaluation, even more capital and operating resources will be needed, even though operating costs have already grown as a proportion of the overall fund revenues. This CIP reflects an expected capital revenue stream of ~$2.4 million starting in FY17 but assumes spending levels of approximately $3 million, drawing off the current fund balance to fund the difference throughout the 10-year planning horizon. Future operating and capital needs for the ramp-up of the Bay TMDL requirements should be better known by the next CIP (FY19-FY28) and are not assumed in this CIP. It is expected that a Stormwater Fund rate increase will occur at some point during this CIP planning horizon. However, it is premature to project the timing or magnitude of a rate increase until the significant number of projects expected to be constructed by the end of 2018 are completed and the total expenditures for these projects are known relative to the fund balance, operating costs, and incoming additional revenues. Additional uncertainties include the completion of EPA's Bay TMDL mid-point assessment and the re-issuances of Arlington's next MS4 permit in June 2018. As highlighted in the previous FY15-F24 CIP, the most fiscally responsible, realistic, and sustainable strategy at this time remains as follows: increasing the County's level of effort in an incremental but significant way, focusing on high priority projects identified through a comprehensive master planning exercise, and using nutrient credits from the Water Pollution Control Plant to extend the compliance deadline as necessary to maintain a sustainable level of project execution. MAINTENANCE CAPITAL: This portion of the Stormwater Management Program CIP ($12.8 million for the 10 year CIP) provides for the orderly and planned rehabilitation or replacement of storm sewer mains, catch basins, outfalls, and flood protection structures as this infrastructure ages and its condition deteriorates. Particular attention will be paid to approximately 11 miles of corrugated metal pipes and plate arch culverts in the storm drainage network that have deteriorated more quickly than other materials. A proactive program of capital maintenance increases the reliability of the collection system and is anticipated to be less expensive in the long term than making major repairs on an emergency basis. Provision is also made for small projects to address local drainage issues not otherwise related to systemic capacity issues and for installation of underdrains in the public right of way to address potential hazards created by groundwater and sump pump discharges. STORMWATER DRAINAGE INFRASTRUCTURE: Overall, the County's storm drainage infrastructure performs adequately under most conditions. However, a severe rainfall event in June 2006 highlighted a number of locations that are subject to flooding. These locations have been evaluated through more detailed modeling analyses documented in the Stormwater Master Plan. This portion of the Stormwater Management Program CIP ($14.8 million for the 10 year CIP) includes the highest priority projects identified to increase capacity of the storm drainage network and reduce flood risks to private property. The Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRMs) were finalized for Arlington County in 2013 and reflect the most recent topographic information. Review of the updated maps highlighted the need to update the analyses of many of Arlington's floodplains. Therefore, this portion of the CIP also identifies floodplains for restudy, and six potential locations for flood risk reduction projects, including a flood risk reduction project along Lower Long Branch. This latter project could potentially remove up to 138 properties from the floodplain, saving an estimated $300,000 in annual flood insurance premiums for property owners. As FEMA subsidies for flood insurance are phased out under recent reforms mandated by Congress, that figure could increase substantially. Master Plan Impact
As discussed above, the projects in the CIP reflect the priorities of the Stormwater Master Plan, adopted by the County Board in September 2014.
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Arlington, Virginia
STORMWATER MANAGEMENT: PROGRAM FUNDING SUMMARY CIP
01 Four Mile Run tidal restoration Project Description This project includes 'living shoreline' features and naturalization of the stream banks along the tidal portion of Four Mile Run between Mt. Vernon Avenue and Route 1, along with an overlook platform. The Four Mile Run bike trail adjacent to the project limits will be reconstructed and re-paved with the project. These living shoreline features will re-use the rock material removed from the stream banks, along with new wetland plants and sandy fill material, to create new habitat and improved water quality and aesthetics, while protecting the banks from erosion.
Associated Master Plan: Four Mile Run Design Guidelines, Four Mile Run Restoration Master Plan, Natural Resources Management Plan (NRMP), Public Spaces Master Plan (PSMP), Storm Water Master Plan, Watershed Management Plan
Critical Milestones: Final design 2016 Construction 2016
Advisory Commission: Environment and Energy Conservation Commission, Park and Recreation Commission, Urban Forestry Commission
Neighborhood(s): VARIOUS
Project Justification Stream and wetland restoration along the Four Mile Run flood control project are the central elements of the Four Mile Run Restoration Master Plan, adopted by Arlington County and the City of Alexandria in March 2006. Changes from Prior CIP Only one bid was received in spring 2015 for construction, which was very high. Project construction access and methods adjustments were made to improve access and reduce cost. Associated Costs and Funding Sources Total Project Cost: $6.575M Design - FY16 $2.575M Construction - FY17 $4.0M
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $4,000
The cost estimates for this project were developed at 100% design. However, the costs are still uncertain due to unfavorable bidding conditions with specialty environmental projects.
There are State and Tribal Assistance Grants (STAG) that, at this time, are approved by Virginia DEQ and EPA to be available on a reimbursable basis following project completion. These STAG funds, if available when reimbursement is requested, will provide $1.4M that will free up local funds that can be reallocated to other critical environmental quality projects to support compliance with the County's MS4 permit.
Invasive plant and litter control activities and overall vegetation maintenance.
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STORMWATER MANAGEMENT
ENVIRONMENTAL QUALITY STORMWATER
MANAGEMENT 2017 − 2026 CIP
02 Ballston Pond watershed retrofit Project Description The Ballston Pond receives runoff from more than 300 acres of urban and suburban land in Arlington County and represents the most feasible opportunity within Arlington for a larger, regional stormwater management facility. This project redesigns the pond as a stormwater wetland, with significantly improved stormwater treatment, habitat, and aesthetics. A new overlook platform will also be included.
Associated Master Plan: Storm Water Master Plan, Watershed Management Plan
Critical Milestones: Final design 2016 Construction 2018
Advisory Commission: Environment and Energy Conservation Commission, Park and Recreation Commission
Project Justification Cumulatively, watershed retrofit projects will help to improve stormwater quality, protect investments in stream restoration, and serve as an important component of the County's obligations under its Municipal Separate Storm Sewer System (MS4) Permit and the Chesapeake Bay Total Maximum Daily Load (TMDL) cleanup effort. This project will provide significant pollutant removal credits toward the TMDL requirements. Changes from Prior CIP Shift in construction schedule due to throughput limitations for design and ongoing effort to obtain last of three needed easements (accepted by County Board in April 2016). Increase in cost estimate due to escalation of construction costs. State Local Assistance Fund (SLAF) grant for $500K for this project will be received on a reimbursement basis. Associated Costs and Funding Sources Total Project Cost: $5.7M FY15: $2.2 M FY18: $3.5M
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $3,500 Cost estimate to be updated at 100% design completion summer 2016.
Operations costs reflect annual maintenance costs for invasive plant control and overall plant establishment of approximately $5,000 per year per project, for a 5-year period. See also impacts described under 'Stormwater Master Plan watershed retrofit projects.' $10,000 per year placeholder below for annual maintenance, pending completion of project and use of new comprehensive maintenance contract.
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STORMWATER MANAGEMENT
ENVIRONMENTAL QUALITY STORMWATER
MANAGEMENT 2017 − 2026 CIP
03 Stormwater Master Plan watershed retrofit projects Project Description Watershed retrofit projects add stormwater storage and filtration to the landscape where none currently exists. Most of these projects will construct bioretention systems with engineered soils and specialized plantings to store and filter stormwater runoff from nearby streets and homes. Priority watershed retrofit projects have been identified through the Stormwater Master Plan update. Several projects have been funded/completed with prior CIP funds.
Associated Master Plan: Storm Water Master Plan, Watershed Management Plan
Advisory Commission: Environment and Energy Conservation Commission
Neighborhood(s): VARIOUS
Project Justification Cumulatively, these projects will help to improve stormwater quality, protect investments in stream restoration, and serve as an important component of the County's obligations under its Municipal Separate Storm Sewer System (MS4) Permit and the Chesapeake Bay Total Maximum Daily Load (TMDL) cleanup effort.
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $7,076
Assumes 50% of $1.5M in annual capital spending for environmental quality program. Overall funding proportions between stream restoration and watershed retrofit programs may be adjusted between programs depending upon TMDL credits, ease of implementation, and other factors.
Assumes addition of 1 design engineer and 1 engineering supervisor to complete a team to support the program (approved with FY 2017 budget). A new FTE is also needed to manage the comprehensive new maintenance contract (also approved with FY 2017 budget). The table below includes 3 FTEs. Additional construction management resources may also be needed but are assumed to be handled through contract resources and are not assumed here. Operations costs include annual maintenance costs of, on average, approximately $5,000 per year per project assuming 3 new facilities each year starting in FY19. Costs for retrofit projects identified in this CIP for FY17 and FY18 are included with each project.
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STORMWATER MANAGEMENT
ENVIRONMENTAL QUALITY STORMWATER
MANAGEMENT 2017 − 2026 CIP
04 Stormwater Master Plan stream restoration project Project Description The County's stream system has been heavily impacted by legacy land use and drainage decisions. Stream restoration is among the critical tools of the County's long-term watershed management program. The primary stream restoration approach includes energy dissipation with strategic grade controls, re-connection with a floodplain area, and extensive planting for bank/floodplain stability and habitat. Priority stream restoration projects have been identified through the Stormwater Master Plan update. Several projects have been funded/completed with prior CIP funds.
Associated Master Plan: Storm Water Master Plan, Watershed Management Plan
Advisory Commission: Environment and Energy Conservation Commission, Park and Recreation Commission, Urban Forestry Commission
Neighborhood(s): VARIOUS
Project Justification The key benefits of stream restoration include: protection of infrastructure: trails, utilities, facilities, private property; improved riparian and aquatic habitat; and, improved aesthetics and recreation. Stream restoration is a central component of the County's watershed management program and is also a key strategy to comply with the pollutant reductions required by the Chesapeake Bay Total Maximum Daily Load (TMDL) cleanup effort.
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $7,076 Assumes 50% of $1.5M in annual capital spending for environmental quality program. Overall funding proportions between stream restoration and watershed retrofit programs may be adjusted between programs depending upon TMDL credits, ease of implementation, and other factors.
Operations costs reflect annual maintenance costs for invasive plant control and overall plant establishment of approximately $5,000 per year per project, for a 5-year period. Costs for stream restoration projects identified in this CIP for FY17 and FY18 are included with each project. See 'Projected Operating Cost Impact' section of the Stormwater master plan watershed retrofit projects for information about additional FTEs needed for engineering and construction management.
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STORMWATER MANAGEMENT
ENVIRONMENTAL QUALITY STORMWATER
MANAGEMENT 2017 − 2026 CIP
Program Description This portion of the Stormwater Management Program CIP includes projects identified and prioritized in the Stormwater Master Plan. Projects include watershed retrofit projects to help reduce the impacts of stormwater runoff on local streams, the Potomac River, and the Chesapeake Bay. This program also includes stream restoration projects to improve stream stability and habitat and protect infrastructure. Both watershed retrofits and stream restoration projects are key parts of the County’s strategy to comply with its new Municipal Separate Storm Sewer System (MS4) permit and the nutrient and sediment reductions required by the Chesapeake Bay Total Maximum Daily Load (TMDL)—a pollution budget for the Bay that was established by the U.S. Environmental Protection Agency in 2010. 05 Williamsburg median watershed retrofit I Rock Spring This watershed retrofit project re-designs two existing medians to function as bioretention systems with engineered soils and specialized plantings to store and filter stormwater runoff from nearby streets and homes. 06 Williamsburg Boulevard median watershed retrofit II Rock Spring This watershed retrofit project is coordinated with a Neighborhood Conservation Program project to add planted medians and other pedestrian- and transportation-related elements to Williamsburg Boulevard. Two of the medians will function as bioretention systems with engineered soils and specialized plantings to store and filter stormwater runoff from nearby streets and homes. Implementation of this project with an NC project will result in reduced planning and design time and overall project costs relative to implementation on its own. 07 N Patrick Henry Drive/20th Street N watershed retrofit Tara-Leeway Heights This watershed retrofit project is coordinated with a Neighborhood Conservation Program project that will improve pedestrian and traffic circulation on Patrick Henry Drive and intersecting streets. Bioretention, which includes engineered soils and specialized plantings to store and filter stormwater runoff from nearby streets and homes, will be incorporated in the curbside infrastructure of the 1800 and 2000 blocks of Patrick Henry Drive. The interior of an extended traffic calming bumpout will become an additional bioretention facility. Joint implementation of this project with an NC project will result in reduced planning and design time and overall project costs relative to a stand alone project. 08 John Marshall Drive/ N Kensington Street watershed retrofit Rock Spring, Williamsburg This project is being designed and constructed in conjunction with the West Little Pimmit Run Phases I/II stormwater infrastructure project. It includes the redesign of a portion of the large median within John Marshall Drive as a bioretention system and the addition of two new bioretention areas along N. Kensington St. with engineered soils and specialized plantings to store and filter stormwater runoff from nearby streets and homes. 09 N Sycamore Street median watershed retrofit Arlington-East Falls Church, Williamsburg A bioretention system with engineered soils and specialized plantings will be constructed in the median of N. Sycamore St as part of a joint Neighborhood Conservation Program/watershed retrofit project. The construction of new median on N. Sycamore St through the NC Program provides an opportunity that would not otherwise have existed to store and filter stormwater runoff from nearby streets and homes. In addition, the joint project will provide traffic and pedestrian circulation benefits, improve traffic safety, improve aesthetics and add canopy trees to the community.
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10 11th Street N watershed retrofit Clarendon-Courthouse This project will add a bioretention system near the townhouses at the Market Common. 11 S Walter Reed Drive watershed retrofit Columbia Heights, Douglas Park This watershed retrofit project complements transportation decal fee-funded improvements to S. Walter Reed Dr. Two bioretention systems will be added to the right-of-way near S. 5th and S. 9th streets to store and filter stormwater runoff from S. Walter Reed Dr and adjacent roads and rooftops. 12 Northside leaf storage watershed retrofit Donaldson Run, Old Dominion This project will retrofit an existing dry detention basin with enhanced water quality treatment to reduce pollutant loads from the northside leaf storage facility. 13 Windy Run stream restoration Woodmont This project includes restoration of approximately 450 linear feet of Windy Run to protect a sanitary sewer lift station, re-alignment of an exposed sanitary sewer, repair of a failed storm sewer outfall, and repair of a failed slope and trail damaged during the June 2006 storm. The key benefits of stream restoration include: protection of infrastructure: trails, utilities, facilities, private property; improved riparian and aquatic habitat; and, improved aesthetics and recreation. 14 Donaldson Run Tributary B stream restoration Donaldson Run The Donaldson Run Tributary B stream restoration project continues the successful stream restoration partnership with the Donaldson Run Civic Association (DRCA) launched with the Tributary A project completed in 2006. This project will restore 1,400 linear feet of eroded and degraded stream channel and create a new channel with bank stability, reduced velocities, and improved habitat.
Program Description Much of Arlington County's stormwater infrastructure was built during the 1940's and 1950's. It is approaching the end of its useful life and a regular repair and replacement program is necessary to ensure the continued functioning of the storm drainage network during storm events in order to prevent flooding and property damage. This category of projects provides for the orderly and planned replacement of storm sewer mains, catch basins, and endwalls (with their associated outfalls). Particular attention will be paid to the approximate 11 miles of corrugated metal pipes and plate arch culverts that have deteriorated more quickly than other materials. Associated Master Plans include the Watershed Management Plan and the Stormwater Master Plan.
01 Woodmont Swale This project relocates the inlet to the storm sewer system and stabilizes the existing swale. Current erosion threatens trees that could damage homes; the same erosion is an environmental concern. The configuration of the existing headwall creates a high potential for clogging, which in the past has caused flooding downstream. 02 Donaldson Run Outfall/ Channel Repair – 24th Road N. This project re-routes drainage from an inaccessible channel where it is causing erosion to a more accessible channel; includes reconstruction of a failing outfall, replacement of approximately 100 linear feet of 15 inch storm sewer and stabilization of approximately 650 linear feet of channel. 03 Maintenance Capital / Local Drainage This category of projects provides for the orderly and planned rehabilitation / replacement of storm sewer mains and catch basins as their condition deteriorates. Particular attention will be paid to the approximate 11 miles of corrugated metal pipes and plate arch culverts that have deteriorated more quickly than other materials. A proactive program of capital maintenance increases the reliability of the collection system, and is anticipated to be less expensive in the long term than making major repairs on an emergency basis.
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Arlington County, Virginia
STORM DRAINAGE IMPROVEMENTS: PROGRAM FUNDING SUMMARY CIP
01 Lower Long Branch Flood Risk Reduction Project Project Description Alternatives are being evaluated to reduce the risk of flooding along Lower Long Branch from South Glebe Road to 26th Street South. Those alternatives include increasing the channel capacity and by providing overflows to a new storm drainage system. The final project will decrease the number of homes in the regulated Federal Emergency Management Agency (FEMA) floodplain.
Associated Master Plan: Storm Water Master Plan, Watershed Management Plan
Advisory Commission: Environment and Energy Conservation Commission
Neighborhood(s): Long Branch Creek
Project Justification The recently updated FEMA flood maps based on the most recent topographic information indicate that approximately 138 homes are threatened by the 100-year flood. A flood risk reduction project along Lower Long Branch has the potential to greatly reduce the risk of flooding to these homes, with the added benefit of reducing the need for flood insurance in this neighborhood; savings for this neighborhood could exceed $300,000 per year.
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Capital Costs during Ten Year Period (FY 2017 to FY 2026) (in $1,000s): $5,403 Costs are order of magnitude only, based on an estimated project length of approximately 5,000 linear feet and a unit cost of $1,000 per foot
Program Description These projects provide additional capacity at locations with limited overland relief. Storm sewer overflows at locations with limited overland relief can result in significant damage to homes. While the County can increase system capacity, some locations will always have some level of vulnerability. The majority of the projects identified in this program address areas that were flooded in the June 2006 storm; the update of the Stormwater Master Plan will be used to refine the designs of these projects.
02 Sycamore Street & 24th Street N Arlington-East Falls Church Construct approximately 1100 linear feet of large diameter storm sewer from the vicinity of N. Rockingham St. and 24th Street North to N. Sycamore St. and Lee Highway. This project is identified in the Stormwater Master Plan as a portion of Project CR2. The additional capacity will help to reduce the frequency of flooding on private property (flooded houses) and will help to reduce the frequency of sanitary sewer backups downstream. 03 West Little Pimmit Run Phases I & II Rock Spring, Williamsburg This project includes approximately 100 linear feet of 48 inch storm sewer; 165 linear feet of 54 inch storm sewer; and 1300 linear feet of 60 inch storm sewer. The project starts in the 3200 block of North Nottingham St and proceeds to the 3200 block of North Kensington Street; then along 33rd Street North to end in the cul-de-sac north of its intersection with 34th Street North. The additional capacity will help to reduce the frequency of flooding on private property (flooded houses) and will help to reduce the frequency of sanitary sewer backups downstream. This project is identified in the Stormwater Master Plan as Project LPW3. 04 Capacity/ Flood Risk Reduction Projects These projects are outlined and prioritized in the 2014 Stormwater Master Plan, and reduce the risk of flooding from systemic capacity limitations of the storm sewer system and from stream channels.
05 9th Street N between Liberty Street & N Livingston Street Dominion Hills This project includes approximately 292 linear feet of 36 inch diameter pipe, 1038 linear feet of 30 inch diameter pipe and associated structures and small diameter storm sewers to reduce the chance of flooding on 9th Road North between North Liberty Street and North Livingston Street. The center of this block is located at a low point, and the existing drainage network cannot convey flows without street flooding, with occasional house flooding.
