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C General This Revised Engineering Feasibility Study (EFS) for the Foothill Sanitary Landfill (FSL) is submitted in response to the following: • August 1, 2014 Notice of Violation (NOV) received from the Central Valley Regional Water Quality Control Board (CVRWQCB). In response to the NOV, The County submitted an Engineering Feasibility Study (EFS) on August 25, 2014. A meeting was held on October 14, 2014 between San Joaquin County (County) and CVRWQCB staff to discuss the EFS. • October 17, 2014 email from the CVRWQCB staff that provided comments to the August 2014 EFS and requested additional information. The FSL is located in eastern San Joaquin County at 6484 N. Waverly Road, four (4) miles east of Linden, CA (Figure 1). Land uses within 1,000 feet of the facility are agricultural, primarily grazing. The FSL is a single Class III Waste Management Module on an 800 -acre parcel. This Module is comprised of Module "I", Area 1, and future lined disposal areas. Waste discharged to the FSL includes commercial and household waste, construction/ demolition waste, and agricultural waste. The total capacity of the landfill is approximately 102 million cubic yards. The active life of the facility is estimated to allow disposal at least until the year 2058. The first water bearing zone encountered is in sandy gravel at a depth of more than 200 feet (ft.) below the ground surface. Groundwater elevations vary between approximately 38 and 61 ft. mean sea level (MSL) across the site. Groundwater elevations fluctuate less than one (1) foot seasonally. The groundwater is unconfined or partially confined. Above the water -bearing zone, the soil layers are moderately to well -cemented layers of sandstone and siltstone with claystone and conglomerates. This soil is mostly moderately low in permeability with sporadic sandy layers that are more permeable. Landfill Construction Module "I" is unlined, covering approximately 80 acres. Module 1 (also designated "Area I") has a composite liner conforming to Resource Conservation and Recovery Act (RCRA) Subtitle D and California Code of Regulations (CCR) Title 27 as follows (from top to bottom): 2 -foot -thick soil operations layer • 8 oz./synthetic nonwoven geotextile separator/filter Drainage layer: — Base: 0.75 -foot -thick gravel drainage layer with leachate collection troughs with 4 -inch -diameter piping Foothill Sanitary Landfill 1 Department of Public Works, Solid Waste Division Revised Engineering Feasibility Study County of San Joaquin — December 19, 2014