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i DER <br /> 'right Bright People.Right Solutions. <br /> the damage was minor and did not appear to impact the system operation at the time <br /> because there were no precipitation events occurring. The damage did not impact the <br /> results of this periodic assessment. A repair of the equipment is scheduled to occur in <br /> late summer. <br /> 2.3 Seepage Monitoring <br /> Seepage is water generated from precipitation events not over the test pad area that <br /> enters the soil profile and generally moves downward. Seepage does not run off of the <br /> test pad area. Seepage from the Test Pad was measured using a tipping bucket that <br /> receives liquid collected from a synthetic liner/drainage layer (pan lysimeter) that is <br /> beneath the Test Pad. The seepage from the test pad was 425.07 cubic feet (cu ft). <br /> The volume of water collected during the 2009/2010 water year is summarized in <br /> Table 1. Chart 1 shows the rainfall vs. seepage volume with actual and modeled data. <br /> Data indicates that the test pad showed an 8.8 percent seepage rate for the 2009/2010 <br /> water year as compared to 3.0 percent in 2009. This may have been due to an increase <br /> in rainfall much greater than the annual rainfall seen in previous years (based on the <br /> precipitation data). <br /> Additionally (and more related to maintenance), vegetative debris was removed from <br /> the seepage drain pipe during the February 2010 site visit. It is unknown how long this <br /> debris was in the pipe and how much water was backed up because of it. It is believed <br /> that this debris originated from the test pad and traveled down to the drain spout over <br /> time. There were no data lost once the blockage was removed. The excess water was <br /> captured in a container and then sent through the tipping bucket at a low flow rate for <br /> accurate measurement. <br /> 2.4 Modeling of Seepage through Prescriptive Cap <br /> Performance of the Title 27 Prescriptive Cap was modeled using HELP and Test Pad <br /> precipitation data collected so far during the 2009/2010 water year. The Prescriptive <br /> Cap was setup in HELP using the following values: <br /> • Layer 1 (vegetative cover), 12 inches thick, sandy silt (HELP soil texture #7) <br /> 47717.111ST01 OR310 Page 4 of 8 August 31, 2010 <br /> Copyright 2009 Kleinfelder <br />