R2018-42 Intergovernmental Agreement with the Sanitary District of Decatur for Wildwood Sanitary Sewer Repairs, CP 2018-06

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Public Works Memorandum NO. 2018-17 DATE: April 24,2018 TO: Honorable Mayor Julie Moore Wolfe and City Council Members FROM: Tim Gleason, City Manager Matthew C. Newell,P.E.,Public Works Director SUBJECT: Resolution to Approve an Intergovernmental Agreement with the Sanitary District of Decatur for the Wildwood Sanitary Sewer Repairs, City Project 2018-06 SUMMARY RECOMMENDATION: It is recommended that the City Council approve the attached Resolution authorizing the Mayor to sign and the City Clerk to attest the Intergovernmental Agreement between the City of Decatur and the Sanitary District of Decatur for the Wildwood Sanitary Sewer Repairs, City Project 2018-06 for a total estimated cost of$75,000. PRIOR COUNCIL ACTION: No prior Council Actions BACKGROUND: The Sanitary District of Decatur owns and operates the Wildwood Interceptor Sewer paralleling the Ward Branch Creek located on the south side of South Side Drive, see attached location map. Stream erosion has exposed portions of the interceptor sewer behind the new police station. The District entered into an agreement with the Farnsworth Group to provide plans and specification to modify the stream channel and protect the Wildwood Interceptor Sewer. The City of Decatur owns and operates a tributary sewer to the Wildwood Interceptor Sewer that has also been exposed due to the stream erosion, see attached photos. The City's sewer crosses the stream to connect into the District's Wildwood sewer. The erosion has exposed the City's sewer and has allowed logs and debris to collect against the pipe. The replacement design will provide a steel superstructure around the pipe with end supports to project the pipe from being dislodged or broken when hit by debris. The project will also reconstruct the channel to be uniform which will allow for debris to pass under or over the pipe during high flow. The joint project between the City and District provides for the most cost-effect solution due to construction staging and site access. The Intergovernmental Agreement allows the Sanitary District of Decatur to manage the project and the City will reimburse the District for the City's portion of the work. The cost for the project is as estimated below: Page I 1