rock creek sewer separation & water main replacement – cso 031, 037, 053 and 058 presented to...
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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
CSO LTCP – Consent DecreeDEADLINES!!!
Award Design Contract
March 23, 2007
Award Construction Contract
March 23, 2009
Complete SeparationMarch 23, 2011
2
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
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
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
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
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
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
Separation Design ChallengesAvoid / Minimize Disturbances to –
bridges, historical sites,major traffic routes,building driveways &
access, NPS property,
existing utilities, Metro
stops, embassy events...
9
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
StakeholdersU.S. State Department
Embassies/ConsulatesNational Park ServiceDDOTMosqueResidentsBusiness
Owners/RestaurantsApartments/Senior
HousingANC’s/Ward
Friends of Rock Creek (FORC)
DDOE (now an MS4 area)
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
Major Construction IssuesKalorama Road
Electric duct conflictBelmont Road
NPS land – Unanticipated rock
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
Kalorama Road
Kalorama RoadView of Electric Vault
Kalorama RoadView of Tunneling Shield
Kalorama RoadTunnel Face with Rock
Kalorama RoadHand Mining
Kalorama RoadFrom Tunnel Looking South
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
Proposed Seismic Alignment
Velocity Profile
Proposed Vertical Alignment
Belmont RoadLooking Uphill (South)
Belmont RoadEquipment Setup
Belmont RoadEquipment Setup
Belmont RoadEquipment Setup
Belmont RoadTunneling
Belmont RoadTunneling
Belmont RoadTunnel Face
Lessons Learned Start Early!Take care of all the stakeholdersAdditional upfront utility locatesSubsurface ExplorationPartnering with ContractorFlexibility in Construction
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