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the rainy season. In contrast, annual species, such as rye grass,may produce a thick cover during their <br /> growing season,but produce shallow roots which cannot remove moisture from deep within the cover layer. <br /> The ET cover was established in December 2008 when the soil of much of the top deck area was amended, <br /> fertilized and reseeded. The cover vegetation continues to flourish(Photos 1 and 2). <br /> Results of monitoring in the 20011-2012 rain year indicate that the ET cover is successful. Because of the <br /> dryness of that rain year,the run-off from the ET cover was too little to measure with the equipment installed <br /> at that time. <br /> Previous rain years show that that the measured percolation in the test area is qpproximately one-half of that <br /> calculated for an intact prescriptive cover(report previously submitted). <br /> The original measuring equipment(dosing siphon in 55 gallon drums)was replaced in 2012 to allow for <br /> better measurement of small amounts run-off. <br /> The surfaces of the landfill, including the ET cover area, are grazed annually to facilitate inspection by the <br /> LEA. <br /> Foothill Sanitary Landfill 12 Department of Public Works/Solid Waste <br /> 1 s'Semester 2013 Groundwater Monitoring County of San Joaquin—July 25,2013 <br />