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t INTRODUCTION General This first semiannual 2014 monitoring report for the Harney Lane Sanitary Landfill (HLSL) is prepared in compliance with Waste Discharge Requirements (WDR) Order No. R5-2009-0049, issued by the California Regional Water Quality Control Board, Central Valley Region (RWQCB) on April 24, 2009. The HLSL is located in Northern San Joaquin County at 14750 East Harney Lane, approximately seven miles east of Lodi (Figure 1). The HLSL is a Class III waste management unit on 127 acres, of which 94 acres received refuse fill. Land within 1000 feet of the property is used for agriculture, grazing, and rural residential. The landfill received approximately 125,000 tons of waste annually in later years of operation, generally construction debris and refuse (residential, commercial, and agricultural). The landfill stopped receiving waste in 1991, and subsequently closed In October 1994. At closure, the landfill contained approximately seven million cubic yards of refuse. Geology and Hydrogeology The soils underlying the landfill consist of unconsolidated silts, clays, and sands, which are representative of typical of sediments found in the Central Valley. The soils are typically highly impermeable with hydraulic conductivities of approximately 106 to 10-8 centimeter/second. Groundwater is first encountered approximately 120 feet below the surface. Groundwater elevations fluctuate approximately 4 feet during the year. The average groundwater elevation is decreasing steadily over time. Because of decreasing water levels, two deeper wells (MW-3A and MW-4A) were installed May 29 through May 31, 2013. These wells were installed in accordance with a work plan approved by the RWQCB. Construction The landfill is unlined. A final cover was applied over the area on which refuse was placed to close the landfill in accordance with an approved Closure Plan. This cover generally consists of a minimum 2-foot thick foundation layer overlain by a 1-foot thick clay barrier layer and a 1-foot thick vegetative layer. Side-slopes were closed with soil only in accordance with the approved Final Closure Plan. COMPLIANCE EVALUATION SUMMARY The landfill was closed in 1994 in accordance with CCR Titles 14 and 27, A landfill gas collection system was installed in 1996 and has been operating since to mitigate potential groundwater impacts and off-site migration of landfill gas. Harney Lane Sanitary Landfill 1 Department of Public Works/Solid Waste 1st Semiannual 2014 Groundwater Monitoring Report County of San Joaquin—July 31,2014