Title
Contract No. 1902658
CSO Outfall Rehabilitation - Phase IV
CIP# 260500/ BCE Score: N/A
Body
Agenda of: December 19, 2019
Item No.: 2019-423
Amount: $5,399,075.00
TO: The Honorable
Board of Directors
Great Lakes Water Authority
FROM: Sue F. McCormick
Chief Executive Officer
Great Lakes Water Authority
DATE: December 3, 2019
RE: Contract No. 1902658
CSO Outfall Rehabilitation - Phase IV
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. 1902658 "CSO Outfall Rehabilitation - Phase IV" with Marra Services, Inc., at a cost not to exceed $5,399,075.00 for a duration of 18 months; and authorizes the CEO to take such other action as may be necessary to accomplish the intent of this vote.
BACKGROUND
CCTV Pipeline Assessment and Certification (PACP) inspections for portions of the Conveyance System outfalls were completed in January 2015. In combination with combined sewer overflow (CSO) frequency data, these outfalls raised concerns regarding their long-term structural integrity. Manual entry inspections, remote-operated vehicle (ROV) inspections, and additional CCTV inspections were completed in November 2018 through April 2019. Based on the above inspections, a repair plan was formulated. This includes rehabilitation of specifically identified outfalls, including cleaning, structural repairs, regulator gate and backwater gate rehabilitation, and access hatch replacement.
The twelve outfalls generally function in a similar fashion, with dry weather flow diverted to the DRI, and wet weather flow allowed to outfall to the Detroit River. Outfalls B-14, B-16, B-18, B-27, B-28, and B-29 have diversion dams which redirect dry weather flow to their respective regulator chamber, where the flow is then routed to the DRI. In ...
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