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INTRODUCTION <br /> General <br /> This First Semester 2012 Monitoring Report for the Foothill Sanitary Landfill (FSL) is submitted in <br /> compliance with Waste Discharge Requirements (WDR) Order No. R5-2003-0020. <br /> The FSL is located in eastern San Joaquin County at 6484 N. Waverly Road, four miles east of Linden, CA <br /> (Figure 1). Land uses within 1,000 feet of the facility are agricultural,primarily grazing. The vicinity <br /> receives an average of approximately 18 inches of precipitation per year. <br /> The FSL is a single Class III Waste Management Unit on an 800-acre parcel. This Unit is comprised of <br /> Module "I", Module 1, and future modules. Future modules will overlap onto other completed modules, <br /> including Module"I"until final closure of the Unit. The size of future modules will be selected in <br /> accordance with the refuse disposal rate. <br /> Waste discharged to the landfill includes commercial and household waste, construction/demolition waste, <br /> and agricultural waste. Disposal in this semester occurred primarily over Module 1 (Figure 2). <br /> The total capacity of the landfill is approximately 102 million cubic yards. The active life of the facility is <br /> estimated to allow disposal at least until the year 2058,based on current disposal rates and capacities. The <br /> estimated service life will change if disposal rates differ significantly than those predicted. The rate of <br /> disposal during the reporting period was less than 20,000 tons per month(Table 1). <br /> TABLE 1 <br /> First Semester 2012 Monthly Refuse Disposal <br /> Foothill Sanitary Landfill <br /> Month Refuse Disposal <br /> (Tons) <br /> January 16,950.80 <br /> February 15,946.90 <br /> March 17,496.30 <br /> April 17,344.70 <br /> May 19,036.90 <br /> June 18,364.70 <br /> Geology <br /> The first water bearing zone encountered is in sandy gravel at a depth of more than 200 feet below the <br /> ground surface. Groundwater elevations vary between approximately 46 and 61 feet MSL. Groundwater <br /> elevations fluctuate less than one foot seasonally. The groundwater is unconfined or partially confined. <br /> Above the water-bearing zone,the soil layers are moderately to well-cemented layers of sandstone and <br /> siltstone with claystone and conglomerates. This soil is mostly moderately slow in permeability with <br /> sporadic sandy layers that are well drained. <br /> Foothill Sanitary Landfill 3 Department of Public Works/Solid Waste <br /> 1"Semester 2012 Groundwater Monitoring County of San Joaquin—July 17,2012 <br />