Title
Resolution to Approve Amendment No. 1 to the Contract with Hubbell, Roth & Clark, Inc. for the Wastewater Treatment Plant Headworks Improvement Project, RFP No. 19-12 ($291,668.00, Total Contract Amount $769,088.53)
Memorandum
Your approval is requested for Amendment No. 1 to the Professional Services Agreement with Hubbell, Roth & Clark, Inc. (HRC) in the amount of $291,668.00 for additional engineering services related to the Headworks Improvement Project at the City's Wastewater Treatment Plant (WWTP). The additional services are for design of an odor control system for the Screen and Grit Building.
The WWTP headworks systems provide initial treatment to remove debris (screenings) and grit from the water as the first stage of treatment, which prevents damage to downstream equipment and systems. The existing systems require more frequent repair and rebuilding and are reaching the end of their useful life. Through RFP No. 19-12, HRC was selected to provide engineering design services to replace the headworks systems. On December 16, 2019, Council approved a Professional Services Agreement with HRC in the amount of $477,420.53 to design the WWTP Headworks Improvement Project (Resolution R-19-564).
HRC has reviewed existing WWTP information, characterized influent wastewater for grit, analyzed the existing headworks hydraulic conditions, proposed alternatives for screening and grit system replacement and is preparing a detailed basis of design and bid package for construction of the project.
Although odor control for the Screen and Grit Building was not included in the original scope of this project, it is in the City's best interests to incorporate it now. An odor study for the Ann Arbor WWTP area was performed in 2018 and 2019 by HDR, Michigan, Inc. (HDR) to address ongoing nuisance odor complaints from WWTP neighbors. The odor study included review and evaluation of available data for the WWTP and surrounding area, sample collection and analysis o...
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