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GAVIN NEWSOM is VHHNIH CLI..MMIA YEGARCIA ETfIN Water Boards ENVIRONMENTAL PROTECTION Central Valley Regional Water Quality Control Board 26 July 2023 Mr. Mark Houghton Senior Civil Engineer San Joaquin County Department of Public Works 1810 E. Hazelton Avenue Stockton, CA 95201 APPROVAL OF CONCEPTUAL LEACHATE MANAGEMENT PLAN, FOOTHILL SANITARY LANDFILL, SAN JOAQUIN COUNTY The Foothill Sanitary Landfill is owned and operated by San Joaquin County Department of Public Works and is regulated by Waste Discharge Requirements (WDRs) Order R5-2015-0058. Foothill Sanitary Landfill LF-2 were constructed with leachate collection and recovery systems (LCRS) and sumps, where the Discharger is required to maintain less than one-foot (30 centimeters) of liquids over the base liner system. This requirement is part of the WDRs and Standard Procedures and Reporting Requirements (SPRRs), Standard Facility Specification E.13. On 8 May 2023, the Discharger notified Water Board staff by email that due to an above average wet season, the leachate volume of sumps 1, 2A, and 2B were not in compliance with Standard Facility Specification E.13. Leachate levels in sumps 1A and 2B exceeded the compliance limits approximately late December 2022. Sump 2A exceeded the compliance limit mid-January 2023. Following the 8 May 2023 email notification, staff initiated a telephone conference with the Discharger to determine what the ongoing conditions of the sumps were and to provide guidance on returning to compliance. Staff requested a leachate management plan to address returning to compliance as soon as possible and to address the long- term management of leachate. On 6 June 2023 the Discharger submitted the Foothill Leachate Compliance Plan (Plan). To address the short-term management of leachate, the Discharger proposed to continue to tank and haul and perform modifications within the sump to address pumping deficiencies. To address long-term management of leachate, the Plan recommended new, storage and disposal capacity that included constructing up to three (3) Class II Surface Impoundments. Other elements were also proposed that will create more efficiency managing leachate generated at the site. These elements are part of the overall design changes required to properly manage leachate flows at the expanding Foothill Sanitary Landfill. MARK BRADFORD, CHAIR I PATRICK PULUPA, ESO., EXECUTIVE OFFICER 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley