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A key component of this method is the vegetation on the cover. Perennial plants, such as purple needle grass <br /> and California Brome, send roots deep within the soil to gather moisture,providing storage capacity during <br /> 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 evapotranspirative (ET) cover was established in December 2008 when the soil of much of the top deck <br /> area was amended, fertilized and reseeded. The cover vegetation continues to flourish. <br /> Results of monitoring in the 2009-2010 rain year indicate that the ET cover is successful,that the measured <br /> percolation in the test area is approximately one-half of that calculated for an intact prescriptive cover(report <br /> previously submitted). Data for the 2010-11 rain year will be available at in early August 1. <br /> The County's consultant with the California Department of Agriculture suggested that the perennial grasses <br /> could be selectively encouraged by grazing after those seeds had been dropped by the plants. In addition, <br /> sheep feces distribute nitrogen from more fertile to less fertile areas. Rempval of vegetation is an effective <br /> method of fire control. <br /> the landfill surface (including the ET closure areas)was grazed in the autumn of 2010, removing much of the <br /> vegetation but leaving some perennial grasses (Photos 1 and 2). The vegetation recovered in the winter and <br /> spring of 2011. <br /> This year the surface was grazed twice, once in April (Photo 5) and again in early August . <br /> Foothill Sanitary Landfill 13 Department of Public Works/Solid Waste <br /> 1*5'Semester 2011 Groundwater Monitoring County of San Joaquin—July 31,2011 <br />