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TO: Honorable Mayor and Members of the Common Council FROM: Mark Rohloff, City Manager DATE: December 10, 2024 SUBJECT: Amendment to Professional Services Agreement with AECOM for Sediment Thickness Verification and Waste Characterization of North High Detention Basin (+$6,605)

BACKGROUND

The North High Detention Basin was constructed in 2010.  The basin is divided into two (2) sections:  the main bay and the forebay.  In 2021, AECOM completed sediment thickness verification for the City of Oshkosh (City).  A total of ten (10) locations in the main bay and four (4) locations in the forebay were checked for sediment thickness.  A summary of those results concluded that the forebay had an average sediment thickness of 1.14’ and an average depth to sediment of 3.8’; and the main bay had an average sediment thickness of 0.47’ and an average depth to sediment of 4.7’.  It was estimated at the time of the investigation that there were approximately three (3) years until the depth to sediment in the forebay reached less then 3.5’.  The City has requested an evaluation of the depth to sediment.

ANALYSIS

A professional services agreement with AECOM for providing sediment thickness verification and water characterization services was reported to the Common Council on February 27, 2024. Additional subcontract lab costs are required to complete these services.

FISCAL IMPACT

Staff have reviewed the amendment and the costs.  The amount of this amendment is time and materials not to exceed $6,605, which will bring the total cost of these services to $34,205.  Funding for this Project is available in the Storm Water Utility Operating Budget (Account No. 05612050-6417/Opertations & Maintenance-3rd Party Contracted Service).

RECOMMENDATION

Chapter 12 of the Municipal Code of the City of Oshkosh provides that professional services of a specialized nature, including engineering services, may be procured without the use of formal, sealed quotes.  In accordance with Section 12-16 of the Code, I am hereby submitting this report regarding this professional services amendment.

Attachments AECOM CA #1-N HS Det Basin

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