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Page 1 of 4 Item #9 CITY COUNCIL AGENDA REPORT February 6, 2024 Public Works - Engineering Division TITLE: ACCEPT PUBLIC IMPROVEMENTS PERFORMED BY GOLDEN BAY CONSTRUCTION, INC. FOR THE VAL VISTA UNDERDRAIN IMPROVEMENTS PROJECT, CIP NO. 21457 SUMMARY This project diverted recycled irrigation water collected in the soccer field underdrain system to the sanitary sewer to meet the State Water Board’s requirement that recycled irrigation water cannot be discharged into the storm drainage system. The work included the installation of 2,100 feet of new sanitary sewer lines, manhole structures, and two packaged pump stations. The project also rehabilitated four existing storm drain outfalls and sections of 18- to 48-inch diameter corrugated metal storm drainpipe. The project was competitively bid on and awarded to the lowest responsible bidder, Golden Bay Construction, Inc., by the City Council on January 17, 2023. Construction of the project is complete to the satisfaction of the Interim Director of Public Works, and staff recommends the City Council accept the project as complete. RECOMMENDATION 1. Accept the project as complete and authorize the City Clerk to file a Notice of Completion. 2. Authorize the release of the retention in the amount of $79,348 to Golden Bay Construction, Inc., 30 days after the recordation of the Notice of Completion. 3. Authorize the return of the project’s balance of $222,227 to the Storm Replacement/Renovation Fund (Fund 441). BACKGROUND In 2013, the City converted the irrigation system in Val Vista Park to use recycled water. This was the City’s first use of recycled water and was relatively easy to accomplish due to Val Vista Park’s close proximity to the Dublin San Ramon Services District (DSRSD) treatment plant that produces the recycled water. Under the State Water Board’s General Order, the recycled water used for irrigation cannot flow into the storm drain system. Procedures were established to collect and pump recycled water into the sanitary sewer system by plugging the storm drain outfalls. The process was labor intensive and routinely caused the hockey rink and skate park to close, and the outfall piping started to corrode severely. In 2018, a study was performed to determine alternatives to storing and manually pumping the recycled irrigation water to the sanitary sewer system. On July 14, 2021, City staff authorized a task authorization in the amount of $74,480 under an on-call agreement with Pakpour Consulting Group to create biddable construction documents for the preferred alternative identified in the 2018 study. During the design, it was determined Page 43 of 554