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® G V N NEWSOM rnvrnNOR Water Boards v ENV E GME FAR ENVIRONMENTAL PROTECTION CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD 27 March 2023 Michael King Director of Public Works City of Lathrop 390 Towne Center Drive Lathrop, CA 95330 CONDITIONAL APPROVAL OF CLOSURE ACTIVITIES, CITY OF LATHROP, CONSOLIDATED TREATMENT FACILITY, SAN JOAQUIN COUNTY The City of Lathrop (City) owns and operates the domestic wastewater treatment system (Consolidated Treatment Facility [CTF]) in San Joaquin County. The Lathrop CTF wastewater discharge to land is regulated under Waste Discharge Requirements (WDRs) Order No. R5-2016-0028, which was adopted by the Central Valley Region Water Quality Control Board (Central Valley Water Board) on 21 April 2016 and amended by WDRs Order No. R5-2018-0023 on 6 April 2018 (R5-2016-0028-01). The City of Lathrop was also issued a Notice of Applicability (NOA) for coverage under the Water Reclamation Requirements for Recycled Water Use General Order by the Executive Officer on 9 June 2020 for the City's recycled water production and distribution system. In addition to regulation under WDRs Order No. R5-2016-0028-01, discharges of treated wastewater to the San Joaquin River are regulated under NPDES Order No. R5-2022-0004 (CA0085359), which was adopted on 17 February 2022. Now that the City has been issued an NPDES permit for the discharge of treated wastewater and a water recycling program has been established, the City is requesting to rescind WDRs Order No. R5-2016-0028-01 because the City is planning to cease all discharges of wastewater to land for disposal purposes. On 22 December 2022, Robertson-Bryan, Inc., on behalf of the City of Lathrop, submitted a WDR Rescission Technical Memorandum that describes how the monitoring wells, land application areas (LAAs), and ponds will be abandoned and closed as part of the closure process for rescinding WDRs Order No. R5-2016-0028-01. The City is requesting to have all treatment and discharges from the CTF regulated under an NPDES permit for discharges to the San Joaquin River by revising the existing NPDES permit, and having their Recycled Water Program regulated under the Water Reclamation Requirements for Recycled Water Use General Order (GO) by revising the existing NOA. Revisions to the NPDES permit and the Recycled Water NOA are necessary prior to rescinding WDRs Order No. R5-2016-0028-01 to ensure all portions of the treatment system, discharge, and distribution system are properly regulated. MARK BRADFORD, CHAIR I PATRICK PULUPA, EsO., EXECUTIVE OFFICER 11020 Sun Center Drive #200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley