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n <br />C <br />7 <br />1� <br />L' <br />!J <br />ADER <br />Bright People. Right Solutions. <br />Per the county's request, a flex pipe was added to the run-off drain pipe to allow for <br />thermal expansion and contraction. <br />"Seepage" refers to water that percolates through the ET test pad soil, to be captured <br />on the liner system at the base of the ET test pad. Seepage from the Test Pad is <br />measured using a tipping bucket that receives liquid collected from a synthetic <br />liner/drainage layer (pan lysimeter) that is beneath the Test Pad. The seepage from the <br />test pad was 562.5 cubic feet (cu ft) this rain year. The volume of water collected during <br />the 2010/2011 water year is summarized in Table 1. Chart 1 shows the rainfall vs. <br />seepage volume with actual and modeled data. <br />Data indicate that the test pad showed an 11.4 percent seepage rate for the 2010/2011 <br />water year as compared to 8.8 percent in 2010. This may have been due to the 32.3 <br />percent increase in rainfall than the annual rainfall seen in the previous year (based on <br />the precipitation data). <br />It was discovered after the first rain event of the 2010/2011 season (October) that <br />seepage data was not being transmitted to the data logger. The conduit pipe was <br />excavated during the December 2010 visit. It was discovered that the communication <br />wire from the seepage tipping bucket to the data logger had been chewed through by <br />either vermin or insects deep inside the conduit pipe. The wire and conduit were <br />replaced and reburied. <br />In the past two seasons, seepage has not been significantly recorded until <br />approximately one to two months following the start of rainfall. Last season, 7.66 inches <br />of rainfall was recorded between October and December 2009, while seepage greater <br />than 0.013 cubic feet was not recorded until January 2010 (51.66 cu D. This season, <br />rainfall between October and December 2010 was 8.69 inches, and recorded seepage <br />in January 2011 (following the repair) was 28.50 cu ft. As anticipated, there appears to <br />be a time lag between rainfall and seepage. For this reason, we believe the loss of <br />seepage data between October and December 2010 does not significantly affect the <br />outcome of these results as the seepage is recorded in January through April 2011 as <br />47717.1 1/ST01 1 R193 Page 4 of 9 August 31, 2011 <br />Copyright 2011 Kleinfelder <br />