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CONSENT ITEM—6.1 ,fi` DEN HILLS MEMORANDUM DATE: August 24, 2020 TO: Honorable Mayor and City Councilmembers Dave Perrault, City Administrator FROM: Todd Blomstrom, Public Works Director/City Engineer SUBJECT: Trunk Water Main Evaluation Budgeted Amount: Actual Amount: Funding Source: $65,000.00 $29,400.00 Water Utility Fund Council Should Consider Authorization of a professional services agreement with TKDA in the amount of $29,400 for the Trunk Water Main Evaluation project. Back2round/Discussion The City Council work session on July 20, 2020 included a discussion of the draft 2021-2025 Capital Improvement Program (CIP). One of the projects listed within the draft CIP is the Trunk Water Main Evaluation. This project consists of an evaluation of the primary trunk water main extending from the south municipal boundary with Roseville to the north and south water towers, including a crossing under Interstate 694 as shown on Attachment A. Much of this water main has been in service since 1968 with minimal improvements or replacement. The City Council discussed the critical nature of this water main and directed staff to move forward with negotiating a professional services agreement for the study with one of the firms included in the existing engineering services pool. Staff worked with TKDA to develop a scope of work for the study, which is divided into two phases. The first phase involves an overall evaluation of the transmission main, including a review of as-built plans, water break history, and soil conditions. Geotechnical borings are included in the scope of work to assist in characterizing the corrosive nature of soils along the pipe alignment and identifying locations where pipe deterioration is most likely to be found. The proposal from TKDA for phase 1 work is provided in Attachment B. Page I of 2