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Wayne County
Lift Station 1A
The Boring that Wasn’t
(Boring)
2012 MWEA Annual
Conference
Overview of Rouge Valley (RV) Sewage Disposal
System
Short Term Corrective Action Plan Background
Lift Station 1A
Background
Capacity Alternatives
Design
Construction
Presentation Outline
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Transports wastewater from 14 communities in
Wayne County and 1 community in Oakland
County to Detroit for treatment and disposal
93 miles of sewer subdivided into two major
interceptor systems which parallel the Rouge
River
First sewers built in the 1930s, with additions in the
1960s and 1980s
30-in to 102-in
1,126 manholes; 27 siphons; 19 overflow
structures
Wayne County
Rouge Valley (RV) Sewage Disposal System
Wayne County Rouge Valley STCAP
Project Highlights
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Short Term Corrective Action Plan (STCAP)
Part of a Final Order of
Abatement for SSO control
Manhole Rehabilitation: 958
Modifications to Regulators
(10) and Comfort Stations (4)
Modifications to Stop Plate
Access Covers at Junction
Chambers (7)
Nearly 1,000 MH Rehabilitated
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Wrapid Seal
external heat
shrink wrap
8 Rouge Valley Sewage Disposal System
Short Term Corrective Action
Plan
195 Manhole
Chimneys coated
with Calcium
Aluminate
Cement
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9 Rouge Valley Sewage Disposal System
Short Term Corrective Action Plan Update
Additional Repairs
Stop Plate Access Covers at Junction Chambers: High Potential For Inflow
• Sewer Rehabilitation:
– 7 segments lined with Cured In Place Pipe:
• 643 ft 48-inch RCP
• 2,834 ft 60-inch RCP
• 806 ft 66-inch RCP,
• 2,594 ft 78-inch RCP
– 3 segments slip lined with HOBAS flush joint pipe
• 1,596 ft 78-inch
• 580 ft 102-inch concrete tunnel
– Spot repairs
– Joint repairs
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11 Rouge Valley Sewage Disposal System
Short Term Corrective Action
Plan
Pre and Post
Sewer Lining
Top of host pipe
removed and new pipe
inserted.
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Yes, this is in a wetland!
14 Rouge Valley Sewage Disposal System
Short Term Corrective Action
Plan Update
Minor Interceptor Repairs Complete
164 Joints Grouted
9 Spot Repairs
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RV Sewer Evolution
1955
Middle Rouge Parkway Interceptor Extension
60” – 66” Diameter
1965
Rouge Valley Interceptor
78” Diameter
1991
Middle Rouge Interceptor Relief
66” – 72” Diameter
2000
LS1A
54” Diameter
DWSD
RV Sewer Operation
DWSD
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RV Sewer Operation
DWSD
Lift Station 1-A Capacity
Completed in 2000
Four 65 cfs Vertical Turbine Pumps w/ VFDs
Design Capacity 250 cfs
Actual Capacity 190 cfs
Operates only in wet weather
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Preconstruction HGL
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LS1A – Operation
LS1A – Operation
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Precast concrete slab
for accessing discharge
box
Operators locked out
pumps to prevent
station flooding.
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Alternatives
8 Alternatives
Simple and inexpensive to complex and expensive
3 Options fixing problem at the Lift Station
5 Options fixing problem at siphon / sewers (including
Vent and Access Chamber at LS 1A)
Alternative 3-
New Discharge Chamber
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Design Features
Four New Junction Chambers
New Parallel Twin Siphon Tubes
New Bypass Gate and Slide Plates
Reverse Slope and Preferential Flow
Vent and Access Chamber at LS 1A
Sealed Existing Downstream
Chambers
Selected Alternative:
New Siphon and Sewer
with Emergency Bypass
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Alternative 6A -
JACK & BORE (2) 54 STEEL CONTAINMENT PIPE WITH
42” CARRIER PIPE (HDPE OR CCFRPMP)
Pipe Slope
Reverse Slope and Preferential Flow
Construction
$18 M STCAP, Inland Waters Construction
$5 M Lift Station 1A: O’Laughlin Construction
State Revolving Loan financing
The successful efforts of Wayne County to secure
ARRA funding for this project results in over $7.75
million cost savings for our system customers of the
estimated $19.85 million total projects costs.
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Eliminated access to discharge
box from inside station.
New vent and access chamber
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Sealed
downstream
chanbers.
LS1A – Post-Improvements
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Vent and Access Chamber Operating
Successfully prior to Siphon Completion
Siphon Construction
Twin Tubes
54” Steel Casing
42” HOBAS Pipe
Water Main Location: “Known Unknown”
River Boring Clay Hardpan
Siphon Casing Crown 5 Ft. Below River Bottom
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Contractor Modification JC-1
Significantly reduced the size of JC-1 by
constructing in two phases.
Minimize potential for failure of existing 72” sewer
Replaced stop plates with sluice gates
$60,000 Owner credit
Phase 1
Receiving Pit
Phase 2
Excavation Over Existing
Sewer
Phase 1
Receiving Pit
Phase 2
Excavation Over
Existing Sewer
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Phase 1 Shaft for New Downstream
Siphon Chamber JC-1
20 ft x 25 ft x 55 ft
Phase 2 Shaft for New Downstream
Siphon Chamber JC-1
Phase 1
Hobas Pipe at New Downstream Siphon
Chamber JC-1
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Phase 2 Shaft for New Downstream
Siphon Chamber JC-1
Phase 2 Precast New Downstream
Siphon Chamber JC-1
Shaft for New Upstream Siphon
Chamber JC-2
25 ft x 40 ft x 30 ft
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Jack & Bore 54” Casing October 20, 2010
The Next day jacking pit floods
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Sheeting and relocate 12” water main.
46 Rouge Valley Sewage Disposal System
Short Term Corrective Action
Plan Update
Repair of River Breach
•Relocation of Dearborn Heights Water Main
•Mid December 2011: Start installation of sheeting in river to
cut-off flow in the trench.
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Sheeting complete Feb. 11, 2011
Pump down JC-2
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Resume north bore Feb. 15, 2011
Cutting head breaks Feb. 16, 2011
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2/17/11 Bore is back on track – advance
30’ since resuming operations.
Hit obstacle 6:00 PM
2/18/11 Jacking pit
floods for second time.
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Great another trip to the
MDEQ – can’t wait
3/3/11 Divers used to
salvage equipment.
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62 Rouge Valley Sewage Disposal System
Short Term Corrective Action
Plan Update Siphon Installation
• Construction site was
frequently inundated
last spring by near
record flooding of the
Rouge River, including
complete flooding of
the construction site 3
times
• 37 rain events in
April and May
2011 alone, which
impeded work
due to the high
flows in the
Rouge River.
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RV – STCAP
Project Highlights
Substantial Completion of Siphon January 10, 2011
So far so good no overflows but haven’t had a large
event.
River crossings can be problematic and contingencies
are needed just in case.
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Wayne County Department of
Public Services – Engineering and
Operations:
Kelly Cave, Razik Alsaigh, Kerreen
Conley, Firooz Fath-Azam, Dan
Alford and Ancell Noel
Project Team:
Hubbell, Roth & Clark, Inc.:
Bill Davis, Tim Sullivan, Eric Warner
