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INTRODUCTION General This Second Semester and Annual 2010 Monitoring Report for the Foothill Sanitary Landfill (FSL)is submitted in compliance with Waste Discharge Requirements (WDR) Order No. R5-2003-0020. FSL is located in eastern San Joaquin County at 6484 N. Waverly Road, four miles east of Linden, CA(Figure 1). Land uses within 1,000 feet of the facility are agricultural, primarily grazing. The vicinity receives an average of approximately 18 inches of precipitation per year. FSL is a single Class III Waste Management Unit on an 800-acre parcel. This Unit is comprised of Module "I",Module 1, and future modules. Future modules will overlap onto other completed modules, including Module"I"until final closure of the Unit. The size of future modules will be selected in accordance with the refuse disposal rate. Waste discharged to the landfill includes commercial and household waste, construction/ demolition waste, and agricultural waste. Disposal in this semester occurred primarily over Module 1 (Figure 2). The total capacity of FSL is approximately 102 million cubic yards. The active life of FSL is estimated to allow disposal at least until the year 2058,based on current disposal rates and capacities. The estimated service life will change if disposal rates differ significantly than those predicted. The quantity of waste placed during the reporting period is shown in Table 1. TABLE 1 Second Semester 2010 Monthly Refuse Disposal Foothill Sanitary Landfill Month Refuse Disposal (Tons) July 19,674 Au ust 18,641 September 18,690 October 18,668 November 17,255 December 18,176 Geology The first water bearing zone encountered is in sandy gravel at a depth of more than 200 feet. Groundwater elevations vary between approximately 46 and 61 feet MSL. Groundwater Foothill Sanitary Landfill 1 Department of Public Works/Solid Waste 2°tl Semester and Annual 2010 Groundwater Monitoring County of San Joaquin—January 31,2011