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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD 0 CENTRAL VALLEY REGION ORDER NO. R5-2003-0020 WASTE DISCHARGE REQUIREMENTS FOR COUNTY OF SAN JOAQUIN AND FOOTHILL SANITARY LANDFILL, INC. FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITOFJKG FOOTHILL SANITARY LANDFILL, MUNICIPAL SOLID WASTE (CLASS III) SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. The County of San Joaquin owns and Foothill Sanitary Landfill Inc. operates the Foothill Sanitary Landfill. The owner and operator are hereafter referred to as Discharger. The facility is a municipal solid waste landfill about 1 mile south of Shelton Road, in Section 12 and 13, T2N, R9E, MDB&M, as shown in Attachment A, which is incorporated herein and made part of this Order. 2. The facility is comprised of an 800 -acre parcel (Assessors Parcel No. 093-44-01) containing a single Waste Management Unit. This Unit is comprised of two areas: LF -I and LF -2. LF -1 contains a single, unlined module (referred to as "Module P'), covering approximately 80 acres. LF -2 is comprised of multiple lined modules, the first of which (Module 1) is planned for completion in 2003. 3. Construction of Module 1 of LF -2 is intended to include approximately 34 acres lined module immediately south and adjacent to LF -1, as shown on Attachment B, which is incorporated herein and made part of this order. LF -2 modules will overlap onto LF -1 as each module is lined and filled until final closure of the Unit. LF -1 is required to be closed due to VOCs in groundwater and because it is not lined. The size of Module 2 and future modules in area LF - 2 will be selected by the Discharger in accordance with the refuse disposal rate. Future Module 1 of LF -2 is currently being excavated as part of landfill operations. Soil is being excavated from the area of Module 1, LF -2 for use as daily and intermediate cover on LF -1 until LF -1 is closed in the near future. It is intended that this procedure will be applied to all future modules. 4. On September 23, 1994, the Board issued Order No. 94-258, in which the facility was classified as a Class III waste disposal site for the discharge of municipal solid wastes in accordance with the regulations in effect when the order was issued. 5. On November 6, 2002, the Discharger submitted an Evaluation Monitoring Plan, which describes the criteria for delineating the nature and extent of groundwater pollution. Because Module "I" is unlined and assuredly the source of contamination (see Finding No. 29), these WDRs require the closure of Module "P' as part of the corrective action measures.