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Rock Creek Sewer Separation & Water Main Replacement – CSO 031, 037, 053
and 058Presented to
CWEA / WWOA / CSAWWA
2011 Tri-Association Conference
Collections Systems
August 31, 2011
Wednesday – 1:30pm
District of Columbia
Water and Sewer Authority
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CSO LTCP – Consent DecreeDEADLINES!!!
Award Design Contract
March 23, 2007
Award Construction Contract
March 23, 2009
Complete SeparationMarch 23, 2011
2
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CD Project RequirementsDC Water needs
to separate the areas tributary to CSOs 031, 037, 053 and 058 in order to eliminate them as CSO outfalls. 3• Foggy Bottom
• DuPont• Circle• Georgetown
• National• Zoo
• Woodley• Park
• CSO 031
• CSO 037
• CSO 053
PROJECT LOCATIONS
• CSO 058
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4
CSO 031 - Overview Smallest sewershed to
separate – approx 2 acres
Comprises one building (mixed use)
Work located south of Pennsylvania Ave, NW on NPS property
Requires 160 ft of 10” sanitary sewer installation
M Street
Pennsylvania Avenue
26th Street
Rock
Cre
ek &
Pot
omac
Par
kway
L Street
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5
CSO 037 - Overview Sewershed approx 15
acres 57 Private Properties
(Residential / Embassy) In DDOT (Public) ROW:
3500 ± feet of new sewers (san & storm)
3600 ± feet of water main replacement
1800 ± feet of sewer rehabilitation (san)
NPS Property: 600 ± feet of
sewers installed via trenchless methods
Rock Creek & Potomac Parkway
Massachusetts Avenue
24th Street
Kaloram
a Road
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6
CSO 053 - Overview Sewershed approx 10
acres 10 Buildings in Project
Site (6 res., 4 large multi-unit)
In DDOT (Public) ROW: 675 ± feet of new
sewers (san & storm)
875 ± feet of water main replacement
NPS Property: 825 ± feet of new
sewers (Portions installed via trenchless methods)
Q Street
Rock Creek & Potomac Parkway
P Street
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7
CSO 058 - Overview• Approx 22 acres remaining to
separate in the sewershed (DC PWD separated the other 83 acres in the 1960’s)• Approx 30 Buildings in Project Site (Residential / Commercial)• Public ROW:• 1000 ± feet of sewer
installation (san & storm)• 1200 ± feet of sewer rehabilitation (sanitary)• 2000 ± feet of water main replacement• NPS Property:
• 1100 ± feet of sewer installation (250 ± feet via trenchless methods)
Calvert Street
Rock Cree
k & Potomac
Parkway
Connecticut Avenue
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Separation Planning Challenges Major Traffic Routes Affected Environmental Assessment
Required DC Water has NO easements on
Federal (NPS) and District property Voluntary private property
separation Embassies required State
Department Involvement 8
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Separation Design ChallengesAvoid / Minimize Disturbances to –
bridges, historical sites,major traffic routes,building driveways &
access, NPS property,
existing utilities, Metro
stops, embassy events...
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Project StatisticsEngineer’s Estimate -
$13,166,273.00Contract bid value -
$10,992,563.00Anticipated Completion Cost -
$12,000,000.00Notice to Proceed - Mar. 25,
2009Contract Milestone - Jan. 24, 2011EPA Consent Decree Date - Mar. 23,
2011(Sewer Separation Complete)
Project Completion Date - Nov. 20, 2011
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StakeholdersU.S. State Department
Embassies/ConsulatesNational Park ServiceDDOTMosqueResidentsBusiness
Owners/RestaurantsApartments/Senior
HousingANC’s/Ward
Friends of Rock Creek (FORC)
DDOE (now an MS4 area)
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PermitsDistrict (Dept. of Consumer Regulatory Affairs
– DCRA)Public Space PermitsTraffic Control & After Hours (DDOT)Stormwater Mgmt / S & E Control (DDOE)
Federal (National Park Service – NPS)Environmental Assessment
Archaelogical / Historical Wetland / Floodplain Etc.
Special Use PermitOthers
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Major Construction IssuesKalorama Road
Electric duct conflictBelmont Road
NPS land – Unanticipated rock
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Kalorama Road – Storm SewerElectric Duct Bank – 350 foot
conflictLimited space for rerouting due to
other utilitiesLimited corridors for relocating due
to major electric crossing/vaultTime constraintsCost Issues
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Kalorama Road
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Kalorama RoadView of Electric Vault
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Kalorama RoadView of Tunneling Shield
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Kalorama RoadTunnel Face with Rock
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Kalorama RoadHand Mining
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Kalorama RoadFrom Tunnel Looking South
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Belmont Road/NPS - RockTime to complete first boreAdditional 2 bores with rock at
launch pitSteep slopesNPS land subject to no surface
disturbanceLocating rock surface profileDetermining proper equipmentTime constraintsSuccessful Bores
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Proposed Seismic Alignment
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Velocity Profile
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Proposed Vertical Alignment
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Belmont RoadLooking Uphill (South)
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Belmont RoadEquipment Setup
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Belmont RoadEquipment Setup
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Belmont RoadEquipment Setup
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Belmont RoadTunneling
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Belmont RoadTunneling
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Belmont RoadTunnel Face
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Lessons Learned Start Early!Take care of all the stakeholdersAdditional upfront utility locatesSubsurface ExplorationPartnering with ContractorFlexibility in Construction