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dCLE/NFLOER <br /> , Bright People.Fight Solution, <br /> 1 PROJECT BACKGROUND <br /> Foothill Sanitary Landfill is owned and operated by San Joaquin County, Department of Public <br /> Works, Solid Waste Division. The landfill is located in eastern San Joaquin County at 6484 N. <br /> Waverly Road (Plate 1). <br /> The ET closure area and ET Test Pad area was constructed on Module "I" during summer 2006 <br /> The ET Test Pad area was constructed with a 30 mil PVC liner, geotextile, geonet, bio-barrier, <br /> and approximately 4'h feet of soil cover (Plates 4, 5, and 6). The ET Test Pad is approximately <br /> 2,500 square feet in area (Plate 2 and 3). <br /> Test Pad monitoring began in mid-November of 2006. Monitoring is accomplished with a <br /> weather station (west station), soil moisture probes, seepage collection (pan lysimeter), and <br /> isurface water run-off collection system (Plate 7). Run-off data is measured with a tipping bucket <br /> and stored in a data logger. The test pad seepage is collected along the pan lysimeter and <br /> conveyed to a tipping bucket/counter as shown in the collection station instrumentation diagram <br /> (Plate 8). <br /> The ET closure area will be accepted as closed by the Regional Water Quality Control Board <br /> (RWQCB) if the ET cover is shown be the functionally equivalent to, or better than, the Title 27 <br /> Prescriptive Cap. Equivalence or better performance is assessed by comparing the measured <br /> seepage through the ET test pad with the calculated seepage through the Title 27 Prescriptive <br /> Cap using the Hydrologic Evaluation of Landfill Performance (HELP) model. The compared <br /> results should show actual seepage less than or equal to the calculated seepage, which <br /> demonstrates water uptake within the cap. Input to the HELP model includes measurements of <br /> rainfall collected at the Test Pad. <br /> During spring and summer 2007, the native plant seeding (completed in fall 2006) was found to <br /> be spotty, showing weak or no growth over a significant portion of the evapotranspiration final <br /> cover (ET Final Cover) within which the ET Test Pad is located. The surface of the ET Final <br /> Cover was reseeded in fall 2007 but did not appear to resolve the situation. In fall 2008, the <br /> surface of the ET Final Cover was again reseeded and supplemented with an organic soil <br /> amendment and fertilizer. The approach was successful. Growth of native plants on the surface <br /> 47717.11/STO13R0532 Page 1 of 10 August 30, 2013 <br /> Copyright 2013 Kleinfelder <br />