sanitary sewer master plan update - alexandriava.gov · sanitary sewer master plan update april 10,...
TRANSCRIPT
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City of Alexandria, Virginia
Sanitary Sewer Master Plan Update
April 10, 2012City Council Work Session
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Tonight’s Agenda
• Draft Master Plan Overview• Infrastructure Needs• Combined Sewer System Permit• CIP Overview• Funding Strategies• Next Steps
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Sewer Master Plan Objectives
• Understand How Systems Work
• Analyze Impacts of Growth
• Incorporate Regulatory Requirements
• Evaluate Infrastructure Improvements and Costs
• Identify Funding Strategies for Large Scale Projects
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Public Outreach and Schedule
• Presentations to:o NVBIA September 2011o Environmental Policy Commission October 2011o ASA Board October 2011
• Schedule for completion:o Final draft for community review and comment in
Spring/Summer/Fall 2012o Adopt as supplement to City’s Master Plan Fall 2012 o Amend in a future year for CSS permit requirements and
implementation plan
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Sanitary Sewer System Components
• City Owned Collection System
• ASA Interceptor Sewers and Pump Stations
• Treatment Facilitieso ASA Advanced Wastewater Treatment Facility
(AWTF)o Arlington County Water Pollution Control Plant
(WPCP)
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City-Owned Collection System
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ASA-Owned Collection System
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ASA Service Area
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Sanitary Sewer Master Plan Considerations
• Growth
• Regulatory Considerations
• Wet Weather Impact
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Growth Forecasts
2,7488,734
14,528
61,767
139,996
0
50,000
100,000
150,000
200,000
Popu
latio
n
Year
Historical and Forecast Population of Alexandria1790 - 2040
Forecast2020-2040
Annexation of West End, 1952
Annexation of Northridge, Rosemont, Town of Potomac, 1930
Growth forecast continues about 1% per year 1960-2040
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Growth Impacts on Treatment Capacity
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Total Average Annual Wastewater Flow (mgd)
Existing 2015 2030 2040 Build-out City Allocation
ASA Service
Area16.30 16.51 18.95 20.44 25.82 21.60
Arlington Service
Area1.40 1.60 1.67 1.67 2.42 3.00
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Regulatory Considerations
• ASA AWTFo Chesapeake Bay TMDL
• Nutrient load caps for nitrogen, phosphorous, and sediment• Impacts wastewater treatment plant costs
• City of Alexandriao Hunting Creek TMDL
• Bacteria reductions at CSS outfalls 002, 003 and 004
o Waste load nutrient allocations (phosphorous and nitrogen)
o Increased attention by Federal and State governments regarding wet weather overflows
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Wet Weather Capacity
• Extreme wet weather events can lead to increased I/I in the Sanitary Sewers, surcharged Interceptors, SSOs and sewer back-ups
• SSOs caused by extreme wet weather may discharge into Hooff’s Run and Four Mile Run
• ASA Interceptor model predicts SSO volume and sewer back-up potential due to extreme wet weather
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Summary of Needs
• Growth Related Needso Collection Systemo Interceptor/Trunk Sewer Systemo Treatment Capacity
• Existing System Needso Inflow & Infiltration Remediationo Wet Weather Managemento Combined Sewer System
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Growth Related Needs
• Collection System Improvementso To be constructed with associated development
• Holmes Run Trunk Sewero Surcharging in upper reaches under evaluationo Future Beauregard, Landmark, Fairfax County growth
• Additional Treatment Capacityo 4 mgd +/- needed at ASA post 2040o Nutrient load allocation increase
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Additional ASA Treatment Capacity
• 4 mgd assumes water conservation measures
• $35.2m to expand ASA capacityo Included in FY 2013 – FY 2022 CIPo Additional nutrient loading requirements, $, timing
TBD• Alternative would be to purchase existing ASA
capacity from Fairfax Countyo Continuing discussions with the Countyo $56m current asking price (2011 dollars)o Includes additional nutrient loading
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Existing System Needs
• Holmes Run I&Io $19.9m to complete (FY 2013 to FY 2017)
• Wet Weather Management Facilityo Cost sharing with Fairfax TBD (assume 50/50)o $31.5m budgeted FY 2014 – FY 2018o Alternative design proposed by ASA under evaluation,
possible cost savingso CSO discussions with DEQ may amend plan
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Existing System Needs
Combined Sewer System
FACTS
VDEQ permit No. VA0087068, Currently up for renewal
Three CSS Areas: King/West Streets, Pendleton Street, Royal Street (Four Outfalls) ~ 540 acres
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Combined Sewer System
• CSO Permit in renewal process and discussions with VDEQ ongoing
• Permit when reissued must be consistent with TMDLs and waste load allocations
• Hunting Creek Bacteria TMDL requirements (reduction in overflows):o Outfall 002 (Royal St.): 80%o Outfall 003 (King & West) 99%o Outfall 004 (Duke St.) 99%
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Combined Sewer System Permit
• Consider suite of practices for incorporation into permito Capital Improvementso Green Infrastructureo Area Reduction Plano Continued Assessment o Alternatives Analysis
• Public Engagement o City will continue to update EPC as a regular agenda item in EPC
meetingso Develop a community outreach and education efforto Potential creation of new advisory body
• Potential additional requirements not in proposed FY 2013 CIP or in sanitary sewer rate increase calculations
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FY2013 – FY2022 City CIP Overview
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Proposed FY 2013 City CIP
Revenue and Expenditure
Overview
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Revenues Expenditures
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FY 2013 – FY 2022 Significant New Funding
• New projects added:o ASA Capacity Expansion = +$35.2mo Wet Weather Management Facility = +$31.5M
• Additional funding:o Holmes Run Sewershed Infiltration and Inflow = +$7.7m
• Total New Funding = +$74.4m
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Potential Long-Term Funding Strategies
• Maintenance Fee Rate
• Connection Fee Rate
• Fee-backed Bonds
• Storm Sewer Tax Rate
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Proposed FY 2013 – Sewer Maintenance (User) Fee
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• FY 2013 User Fee Comparison (per 1000 gallons):o ASA/Alexandria = $7.61 (City = $1.25, ASA = $6.36)o Arlington County = $8.51o Fairfax County = $7.03 o Prince William County = $6.55 residential, $7.15
commercialo WSSC = $3.27 to $8.30, based on usage
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Other Funding Strategies –
Sewer Connection Fee Model
• Model assumptions:o Growth related needs funded by the connection feeo Existing system needs funded by the maintenance fee
• Modeling effort ongoing• Single-family vs multi-family connection fee
analysis• Credit for teardowns to be explored
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Sewer Connection Fee Discussion for Multi-Family
Jurisdiction Single‐FamilyConnection Fee
Multi‐FamilyConnection Fee
Ratio ofMF to SF
City of Alexandria $8,175 $4,087 50%Prince William County
$10,300 $8,240 80%
Fairfax County $7,750 $6,200 80%WSSC $3,500
(unimproved area), $10,750 (improved area)
$3,500(unimproved area), $10,750 (improved area)
100%
Arlington County $110/DFU $110/DFU varies
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‐ Ratio of multi‐family to single‐family water usage = 0.87(Source: 2010 Washington Metro Area Water Supply Reliability Study)
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Funding Strategies
• Current funding plan does not yet include:
o Holmes Run Trunk Sewer capacity capital costs
o Combined Sewer System permit change capital and operating costs
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Public Outreach and Schedule
• Presentations to:o NVBIA September 2011o Environmental Policy Commission October 2011o ASA Board October 2011
• Schedule for completion:o Final draft for community review and comment in
Spring/Summer/Fall 2012o Adopt as supplement to City’s Master Plan Fall 2012 o Amend in a future year for CSS permit requirements and
implementation plan
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Summary & Next Steps
• Public outreach• Continue evaluation of Holmes Run Trunk Sewer• Continue CSS permit negotiation• Continue study of wet weather management
facility• Continue rate/fee studies and provide
recommendations• Master Plan adoption
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City of Alexandria, Virginia
Thank You
Questions and Answers
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FY 2013 – FY 2022
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Changes from Proposed FY 2013 to FY 2012 Approved
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