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TO: Mayor Richard C. Irvin
FROM: John Hoffmann, P.E., Engineering Coordinator
DATE: March 11, 2024
SUBJECT:
A resolution authorizing the Director of Purchasing to execute a 2-year contract with Fehr Graham & Associates, LLC in the amount of $341,560.00 for monthly CSO Monitoring, DMR Reporting and new flow meters.
PURPOSE:
To continue the City's professional services agreement with Fehr Graham to provide Combined Sewer Overflow (CSO) structure monitoring and Discharge Monitoring Reports (DMR) as required by permit.
BACKGROUND:
As part of the Clean Water Act, the Environmental Protection Agency created the National Pollutant Discharge Elimination System which resulted in the creation of several permits for the City of Aurora. To comply with one of these permits, the City was required to create a Long-Term Control Plan (LTCP) that would be implemented over several years to reduce discharges from the combined sewer system into the Fox River and Indian Creek. The City is also required to submit Monthly Discharge Monitoring Reports (DMRs) to the IEPA and USEPA for each Combined Sewer Overflow structure within the City.
Flow meters have been strategically placed at each of the City's 16 CSOs to capture the data that is submitted on the DMR's. Twice a month, flow meter data including discharge volumes and durations is downloaded from each flow meter to develop the reports. This work is currently performed by a consultant who also cleans the meters, replaces batteries and performs other maintenance activities. Due to their knowledge of the CSO system's layout, operations and history, Fehr Graham is uniquely qualified to provide this professional service.
The existing flow meters have reached the end of their useful life. New flow meters will be installed at each overflow structure. During the replacement of these meters, the consultant will also inventory the existing condition of the structures, obtain updated photography and take measurements of...
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