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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -2- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY corresponding to Assessor Parcel Number 093-44-01. The geographic coordinates of the site are Latitude 38.036° north, Longitude -120.945 ° west. The facility address is 6484 North Waverly Road, Linden, CA 95326. See Attachment B: Area Map. 4. From 2003 to 2025, the facility was regulated under WDRs Order R5-2003- 0020. On 17 December 2014, the Discharger submitted an amended Joint Technical Document (JTD) describing/referencing significant changes associated with the facility since adoption WDRs Order R5-2003-0020 in January 2003, including, but not limited to, the following: a. Issuance of Cleanup and Abatement Order R5-2004-0706 on 18 May 2004 for corrective action relating to VOC impacted groundwater underlying Landfill 1; b. Implementation of a Site Improvement Program, including, but not limited to, installation of a landfill gas collection system and partial final closure of unlined Landfill 1, Module I; c. Installation of gas migration monitoring wells along the site perimeter; d. Monitoring data indicating the continued presence of landfill gas in the unsaturated zone and low-level VOC impacts to groundwater; e. A revised Preliminary Closure and Postclosure Maintenance Plan; and f. Updated financial assurances information. Based on the 2014 JTD, on 17 April 2015, the Central Valley Water Board adopted WDRs Order R5-2015-0058, which rescinded and replaced WDRs Order R5-2003- 0020, except for enforcement purposes, and included updated findings and requirements for the facility. 5. The landfill has been in operation since 1965, accepting household, commercial, industrial, and agricultural wastes from the Cities of Stockton, Manteca, Tracy and surrounding areas. The landfill property was previously owned by Nomellini Construction, Inc. and then Waste Management of North America, Inc. In 1991, the County acquired the property in condemnation proceedings. Foothill Sanitary Landfill, Inc. has operated the landfill since start-up. 6. The facility includes the landfill and associated controls and monitoring systems (e.g., leachate, landfill gas, surface water, groundwater); storm water retention basins; access roads; office and maintenance buildings; a scale house; pump station; a white goods processing area; and undeveloped acreage for future module expansion; all as shown in Attachment C: Site Map. 7. The landfill consists of two classified waste management units referred to as Landfill 1 (LF-1) and Landfill 2 (LF-2). LF-1, the older of the two landfills, is an 85-acre, unlined landfill unit in the central portion of the site. LF-1 consists of a single, unlined Module I that was partially-closed in 2006 and no longer accepts waste. LF-2 is a lined, expansion landfill being constructed one module at a time around LF-1. Each LF-2 module will be constructed on an as-needed basis as existing modules are filled. Development of LF-2 around LF-1 will proceed in a clockwise sequence. At projected