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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION CLEANUP AND ABATEMENT ORDER NO. R5-2004-0706 FOR COUNTY OF SAN JOAQUIN AND FOOTHILL SANITARY LANDFILL, INC. FOOTHILL SANITARY LANDFILL, MUNICIPAL SOLID WASTE (CLASS III) SAN JOAQUIN COUNTY This Order is issued to County of San Joaquin (owner) and Foothill Sanitary Landfill, Inc. (operator) (hereafter collectively known as "Discharger") and is based on provisions of California Water Code Section 13304 which authorize the Regional Water Quality Control Board, Central Valley Region (hereafter known as "Regional Board") to issue a Cleanup and Abatement (CAO) Order. The Executive Officer of the Regional Board finds, with respect to the Discharger's acts, or failure to act, the following: San Joaquin County owns and Foothill Sanitary Landfill, Inc. operates a Class III municipal solid waste landfill about 1 mile south of Shelton Road, in Section 12 and 13, T2N, R9E, MDB&M, known as the Foothill Sanitary Landfill. 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 -1 and LF -2. LF -1 contains a single, unlined module (referred to as Module "I"), covering approximately 80 acres. LF -2 is comprised of multiple lined modules, the first of which was completed in March 2004. Waste Discharge Requirements (WDRs) Order No. R5-2003-0020 was adopted by the Regional Board on 31 January 2003. The WDRs address the construction, operation, closure, and evaluation monitoring of the Class III landfill. 4. The Discharger is responsible for complying with this enforcement order. The monitoring results indicate that landfill gas (LFG) from the unlined Module "I" at the Foothill Landfill has impacted groundwater. The volatile organic compounds (VOC) were confirmed in well MW -3 and the VOCs that were most prevalent are Tricholoroethene (TCE) and 1, 1 -Dichloroethene (1,1-DCE). TCE had eleven quantified detections with a maximum concentration of 4.0 micrograms per liter (µg/1) and an average concentration of 0.78 µg/l. 1,1-DCE had six quantified detections with a maximum concentration of 0.32 µg/1 and an average concentration of 0.16 µg/l. 6. Title 27, California Code of Regulations (Title 27 CCR), Division 2, Subdivision 1, requires the Discharger submit to the Board an engineering feasibility study for a corrective action program necessary to meet the requirements of Section 20430. At a minimum, the study shall