district of columbia water and sewer authority fort stanton (cso 006) separation project - status...
TRANSCRIPT
District of ColumbiaWater and Sewer Authority
Fort Stanton (CSO 006) Separation Project - Status and Coordination Update -
for theEnvironmental Quality and
Operations Committee Meeting
REVISED
May 20, 2004
Presentation Overview
Project Description
Coordination / Planning
Lead Service Replacements
Separation CIP Costs
Separation CIP Schedule
Current Status
CSO-006 Separation Study Area
N
Source: NOT TO SCALE
CSO-006 Separation Study Area
(Approximate)
Anacostia CSO-006 Separation
Separation of 13.5 acre CSO area on east side of Anacostia (CSO-006)
CSO outfall converted to storm water outfall
New storm sewer planned (some new sanitary sewer needed)
Reduction/control of stormwater would benefit water quality
LID is possible technique
Engineering study complete
Extent of Current Development in CSO-006 Area
Typical Combined Sewer Connection in CSO 006 Area
Separation Plan in CSO 006 Area (Est. Cost =
$3,900/private property)
New Storm Sewer Connection
New Storm Sewer in Street
Roof Leader Disconnected and Rain Barrel (LID) Used*
*No Extension on Private Property Required (May Result in 10-50% savings).
Disconnects
Combined Sewer Converted to Sanitary Sewer
CSO-006 - LID Option Summary
Options Considerations
Constructed wetland
National Park Service acceptance Land availability Initial cost Responsibility for long term O & M
Water Quality Catch Basins
Cost Public Disruption
Biofiltration and Porous Pavers
Cost Public Disruption Long term O&M Considerations
Rain Barrels at Downspouts
Public interest Work required on private property Support of community Long term success
Constructed Wetland
Specifically considered for Anacostia CSO-006 separation
Treats and infiltrates stormwater Handles smaller flows Mix of treatment and
infiltration Larger flows go to
receiving water
I-295
Anaco
sti
a
Riv
er
Constructed Wetland
CSO converted to storm water outfall
NPS Property
NOT TO SCALE
N
Bioretention/Filtration
Paired biofiltration unit and catch basin
Allows retention and filtration Improves streetscape
Street
Low flows
High Flows
Catch Basin
Biofiltration Unit
FilterraTM unit courtesy of Americast
Bioretention/Filtration
Water Quality Catch Basins
Allows settling/treatment of storm water
Typical Triple Water Quality Catch Basin
Outlet
Oil/Grease/ Floatables
Solids/Grit Solids/Grit
Water Line
Rain Barrels at Downspouts
Captures and holds rain for beneficial use Water conservation as well as storm
water reduction benefit
Coordinated WASA Activities
Lead Service Replacements and Other Improvements to the Water System
Combined Sewer Overflow (CSO-006) Separation Project
Lead Services in/around CSO 006 Area
Approximate Number ofApproximate Number ofStreetStreet Lead ServicesLead Services
MLK Avenue, SE MLK Avenue, SE 9 9
U Street, SE U Street, SE 21 21
V Street, SE V Street, SE 20 20
Lead Service Replacements in CSO 006 Separation Area
*Total Est. Cost: 50 Services x $10,000/service = $500,000**Est. Cost does Not include Paving or Work on Private Property
Total Estimated Cost* Total Estimated Cost* $500,000** $500,000**
• Construction Planned to Start in Fall 2005Construction Planned to Start in Fall 2005
• Ongoing Lead Service Replacements Ongoing Lead Service Replacements Completed During This TimeCompleted During This Time
• Priority Lead Service Replacements Will Be Priority Lead Service Replacements Will Be Completed EarlierCompleted Earlier
Lead Service Replacements in CSO 006 Separation Area
Planning with Others
Trans~forming Anacostia Partnership Working with Multiple Groups
Anacostia / Fort Stanton Community & ANCs DC Office of Planning DC Dept of Health DC Dept of Transportation National Park Service Anacostia Watershed Society LID Center
Community Groups and ANC’s Planning public meetings in Summer 2004
Current CIP Budget1
Notes:
1. Current CIP Costs are for CSO 006 Separation Project Only (i.e., lead service replacement cost NOT included), and are partially funded with an EPA SAP Grant.
Project ItemBudgeted Cost
($ in millionss)
Engineering Study / Outreach
0.123
Design Services / Outreach 0.270
Construction Management 0.300
Construction Services 2.807
Total Budgeted Cost $3.5 M
ItemFY 2003
FY 2004
FY 2005
FY 2006
FY 2007
Engineering Study / Outreach
Design Services / Outreach
Construction Period1
Beneficial Occupancy
Current Schedule
Notes:
1. May vary, dependent on coordination with other groups and DC Agencies (i.e., DDOT).
Alternatives Considered Alt. 1 – Use of 8 “Filterra” biofiltration tree
boxes w/ CSO Separation Plan
Alt. 2 - Use of 12 “Filterra” Biofiltration Tree Boxes and Inline Trash Netting along SW Outfall w/ CSO Separation Plan
Alt. 3 – Use of 23 “Filterra” biofiltration tree boxes and 23 DDOH-approved Water Quality Catch Basins w/ CSO Separation Plan
Alt. 4 - Use of 23 DDOH-approved Water Quality Catch Basins (WASA option if DDOT does not sign MOA for tree box O&M) w/ CSO Separation Plan
Alternatives - Cost Comparison
LID Grant Option
LID grants would be provided to homeowners for disconnection of roof leaders for onsite infiltration
Funding for onsite design of rain barrels, rain gardens, and porous pavers
Plumbing permit required through DCRA, and program administered by Environmental Stakeholder (e.g., AWS)
Current Status
Final CSO 006 Separation Study Submitted
Recommended Alternative 3 - Use of 23 “Filterra” biofiltration tree boxes and 23 DDOH-approved Water Quality Catch Basins w/ CSO Separation Plan (Alt. 3 Layout – Last Slide)
Grant Concept Approved for Implementation of LID Controls by Environmental Stakeholder Group
Meetings Scheduled with Stakeholders and Coordinating with Public / ANCs
CSO-006 Separation Study – Alternative 3