Title
Contract No. 1904337
WRRF PS-2 Bar Racks Replacements and Grit Collection System Improvements
CIP# 211007 / BCE Score 65.2
Body
Agenda of: September 23, 2020
Item No.: 2020-308
Amount: $11,307,128.58
TO: The Honorable
Board of Directors
Great Lakes Water Authority
FROM: Sue F. McCormick
Chief Executive Officer
Great Lakes Water Authority
DATE: August 21, 2020
RE: Contract No. 1904337
WRRF PS-2 Bar Racks Replacements and Grit Collection System Improvements
Vendor: Hazen & Sawyer
MOTION
Upon recommendation of Navid Mehram, Chief Operating Officer - Wastewater Operating Services, the Board of Directors (Board) of the Great Lakes Water Authority (GLWA), authorizes the Chief Executive Officer (CEO) to enter into Contract No. 1904337, "WRRF PS-2 Bar Racks Replacements and Grit Collection System Improvements" with Hazen & Sawyer, at a cost not to exceed $11,307,128.58 for a duration of 2,402 days; and authorizes the CEO to take such other action as may be necessary to accomplish the intent of this vote.
BACKGROUND
GLWA operates two pump stations that lift the gravity sewer flow into the Water Resource Recovery Facility (WRRF) for treatment. Pump Station 1 receives flow from the Detroit River Interceptor and Oakwood-Northwest Interceptor (O-NWI). Pump Station 2 provides increased pumping capacity (beyond that of Pump Station 1) for O-NWI flows and provides priority treatment to the North Interceptor-East Arm (NI-EA) which receives primarily domestic sewage. The influent wastewater is lifted by the two pump stations and introduced to Preliminary Treatment processes: Screening and Grit Removal. Screening removes rags, plastics, floatables, and large solids while grit takes out heavy, abrasive, mostly inorganic particles out of the wastewater stream. The large solids, grit and rags, can interfere with treatment processes or cause undue mechanical wear and increased maintenance on downstream wastewater treatment equipment.
The WRRF Pump Station 2...
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