Title
GLWA-CON-260
CSO Outfalls Rehabilitation Phase I
Body
Agenda of: May 23, 2018
Item No.: 2018-731
Amount: $3,534,275.00
TO: The Honorable
Board of Directors
Great Lakes Water Authority
FROM: Sue F. McCormick
Chief Executive Officer
Great Lakes Water Authority
DATE: May 1, 2018
RE: Contract No. GLWA-CON-260
CSO Outfalls Rehabilitation Phase I
Vendor: Marra Services, Inc.
MOTION
Upon recommendation of Cheryl Porter, Chief Operating Officer - Water and Field Services, the Board of Directors (Board) of the Great Lakes Water Authority (GLWA), authorizes the Chief Executive Officer (CEO) to enter into Contract No. GLWA-CON-260 "CSO Outfalls Rehabilitation Phase I" with Marra Services, Inc. at a cost not to exceed $3,534,275.00 for a duration of 270 days; and authorizes the CEO to take such other action as may be necessary to accomplish the intent of this vote.
BACKGROUND
Closed Circuit Televised Video (CCTV) Pipeline Assessment and Certification (PACP) inspections for portions of conveyance system outfalls B-003, B-005, B-007, and B-010 were completed in January 2015. In combination with combined sewer overflow (CSO) frequency data, these outfalls raised concerns with GLWA regarding their long-term structural integrity.
In November 2017, manual entry inspections, remote-operated vehicle (ROV) inspections, and additional CCTV inspections were completed. Based on the inspections, a repair plan was formulated that includes rehabilitation of these outfalls. Rehabilitation of these outfalls include cleaning, structural repairs, regulator gate rehabilitation, and access hatch replacement.
Outfalls B-003, B-005, B-007, and B-010 generally work in a similar fashion, with dry weather flow diverted to the Detroit River Interceptor (DRI), and wet weather flow allowed to outfall to the Detroit River. Outfalls B-003, B-005, and B-007 have diversion dams which redirect dry weather flow to their respective regulator chamber where the flow is then routed to the DRI....
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