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r— DER ,, Bright People.Right Solutiom of the ET Final Cover is more dense and uniform. There are a few small areas of limited growth, these small areas were hydroseeded in early spring 2009, resulting in new growth. Therefore, the five-year monitoring period for demonstration of the effectiveness of the ET cover began with the 2008/09 rain year. In accordance with discussions between the County and RWQCB staff, the test pad will be monitored for a minimum of five rainy seasons, beginning with and including 2008/09 and concluding with the rainy season 2012/2013. This marks the fifth consecutive season in which the success of the ET closure method at this landfill is successfully demonstrated. Sheep continue to graze the area during late spring to selectively select for perennial grasses such as purple needle grass and California brome which have deep root structure. 1.1 MAINTENANCE ITEMS The sediment tank that was damaged during the summer months of 2010 was replaced in August, 2010. Per the county's request, a flexible pipe section was added between the test pad and sediment tank in August, 2010 to allow for thermal expansion and contraction. It was discovered after the first rain event of the 2010/2011 season (October) that seepage data was not being transmitted to the data logger. The conduit pipe was excavated during the December 2010 visit. It was discovered that the communication wire from the seepage tipping bucket to the data logger had been chewed through by either vermin or insects deep inside the conduit pipe. The wire and conduit were replaced and reburied. In September 2012, the run-off dosing siphon was replaced with a tipping bucket due to leaks around the seals. That same month, since seepage appeared so low, the seepage pipe was inspected using a video camera to check for blockages or breaks. This was performed on September 14, 2012 even though the current monitoring year ended on June 30, 2012 to see if any residual seepage water had accumulated behind a blockage or possibly leaked out through breaks in the pipe. There were no blockages or breaks seen in the seepage pipe. 47717.11/ST013R0532 Page 2 of 10 August 30, 2013 Copyright 2013 Kleinfelder