Title
Resolution to Approve a Professional Services Agreement with OHM Advisors (OHM) to Design the Odor Control System for Solids Handling Building Truck Loading at the Water Resource Recovery Facility (WRRF), RFP 25-55 ($265,904.00)
Memorandum
Your approval is requested for a Professional Services Agreement with OHM Advisors (OHM) in the amount of $265,904.00 for professional engineering services to design the Odor Control System for Solids Handling Building Truck Loading at the Water Resource Recovery Facility (WRRF).
An odor study for the Ann Arbor Water Resource Recovery Facility (WRRF) area was performed in 2018 and 2019 by HDR, Michigan, Inc. (HDR) to address ongoing nuisance odor complaints from WRRF neighbors. The odor study included review and evaluation of available data for the WRRF and surrounding area, sample collection and analysis of air samples from potential odor sources, assessment of the effectiveness of the WRRF existing odor control systems, air dispersion modeling to assess how odors may migrate within the study area based on geographical and climatic conditions and an objective assessment of where odors are likely to exist at nuisance levels.
The HDR report identified two areas at the WRRF that potentially cause offsite nuisance odors under certain meteorological circumstances. These locations include the Screen and Grit Building and the Solids Handling Building's truck loading area. A new odor control system was designed and construction was completed and was placed into service in 2024 as part of the Headworks Improvement Project.
The design and Installation of an odor control system for the Solids Handling Building's truck loading area (UT-SN-22-05) is included in the City's Capital Improvement Plan (CIP) beginning in FY26. RFP No. 25-55 was prepared seeking the services of a professional engineering firm to review existing operations, collect additional data and information, propose an odor control system and prepare contract ...
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