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