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INTRODUCTION <br /> General <br /> This Engineering Feasibility Study (EFS) for the Foothill Sanitary Landfill (FSL) is submitted in <br /> response to the August 1, 2014 Notice of Violation (NOV) received from the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB). <br /> ' The FSL is located in eastern San Joaquin County at 6484 N. Waverly Road, four miles east of <br /> Linden, CA (Figure 1). Land uses within 1,000 feet of the facility are agricultural, primarily <br /> ' grazing. The FSL is a single Class III Waste Management Unit on an 800-acre parcel. This Unit <br /> is comprised of Area"I", Area 1, and future lined Areas. <br /> Waste discharged to the landfill includes commercial and household waste, construction/ <br /> demolition waste, and agricultural waste. The total capacity of the landfill is approximately 102 <br /> million cubic yards. The active life of the facility is estimated to allow disposal at least until the <br /> year 2058. <br /> Geology <br /> The first water bearing zone encountered is in sandy gravel at a depth of more than 200 feet(ft) <br /> below the ground surface. Groundwater elevations vary between approximately 38 and 61 ft <br /> MSL. Groundwater elevations fluctuate less than one foot seasonally. The groundwater is <br /> unconfined or partially confined. <br /> Above the water-bearing zone,the soil layers are moderately to well-cemented layers of <br /> sandstone and siltstone with claystone and conglomerates. This soil is mostly moderately slow <br /> in permeability with sporadic sandy layers that are well drained. <br /> Landfill Construction <br /> Area"I" is unlined, covering approximately 80 acres. Area 1 has a composite liner conforming <br /> to RCRA Subtitle D and CCR Title 27 as follows (from top to bottom): <br /> • 2-foot-thick soil operations layer <br /> 1 • 8 oz/synthetic nonwoven geotextile separator/filter <br /> • Drainage layer: <br /> — Base: 0.75-foot-thick gravel drainage layer with leachate collection troughs with <br /> 4-inch-diameter piping <br /> — Side slopes: geocomposite drain layer with nonwoven geotextile separator/filter <br /> • 60-mil HDPE geomembrane <br /> • Geosynthetic clay liner (GCL) on prepared surface <br /> • 1-foot thick prepared subgrade (base only). <br /> Area 1 was constructed in two phases. The first phase of approximately 34 acres was completed <br /> in 2003. The second phase of approximately six acres was completed in 2006. A portion of the <br /> liner installed in the second phase was placed over refuse of Area"I" at the request of <br /> CVRWQCB. The extension of the RCRA- and CCR Title 27-compliant liner into Area 2, which <br /> is south of Area 1, is scheduled for early 2015. <br /> Foothill Sanitary Landfill 1 Department of Public Works/Solid Waste <br /> Engineering Feasibility Study County of San Joaquin—August 2014 <br />