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0 <br />11 <br />'J <br />l <br />J <br />u <br />u <br />0 <br />I <br />11 <br />H <br />u <br />u <br />0 <br />V <br />Bright People. Right Solutions. <br />Foothill Sanitary Landfill is owned and operated by San Joaquin County, Department of <br />Public Works, Solid Waste Division. The landfill is located in eastern San Joaquin <br />County at 6484 N. Waverly Road (Plate 1). The ET closure area was constructed on <br />Module "I" during summer 2006, and monitoring began in mid-November of that year <br />(Plate 2 and 3). The ET Test Pad area was constructed. with a 30 mil PVC liner, <br />geotextile, geonet, bio -barrier, and approximately 41/2 feet of soil cover (Plates 4, 5, <br />and 6). <br />Successful growth was established after amending the soil in the fall of 2008, and <br />reseeding in the fall of 2008 and spring of 2009. <br />This growth remained strong through 2009 and into the 2011 rainy seasons (Photos 1 <br />and 2). Sheep were brought onsite during late spring 2010, early spring 2011, and late <br />spring 2011 to control this overgrowth and allow the perennial grasses to thrive (Photo <br />3). Site photos are shown on Plate 9. <br />The ET closure area will be accepted as closed by the Regional Water Quality Control <br />Board (RWQCB) if the ET cover is shown be the functionally equivalent, or better, to the <br />Title 27 Prescriptive Cap. Equivalence or better, performance is assessed by comparing <br />the actual seepage through the ET test pad with the calculated seepage through the <br />Title 27 Prescriptive Cap using the Hydrologic Evaluation of Landfill Performance <br />(HELP) model. The compared results should show actual seepage less than or equal to <br />the calculated seepage, which demonstrates water uptake within the cap. Input to the <br />HELP model includes measurements of rainfall collected at the Test Pad. <br />47717.11/STO11 R193 Page 1 of 9 August 31, 2011 <br />Copyright 2011 Kleinfelder <br />