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California Regional Water QualityControl Board <br /> t�%j Qa; Central Valley Region <br /> Katherine Hart, Chair '`'• <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold <br /> 0 Secretary for Phone(916)464-3291 • FAX(916)464-4645 Schwarzenegger <br /> Environmental http://vwivi.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> 23 September 2010 <br /> Kevin Basso, General Manager <br /> Forward Inc. <br /> 1145 West Charger Way <br /> Stockton, CA 95206 <br /> ALTERNATIVE FINAL LANDFILL COVER, EQUIVALENCE TO TITLE 27 PRESCRIPTIVE <br /> COVER, FORWARD LANDFILL, SAN JOAQUIN COUNTY <br /> Regional Water Board staff has reviewed the "Fourth Year Moisture Monitoring Performance <br /> Report"(Report) submitted on 16 September 2010. The Report uses temperature, <br /> precipitation, soil moisture and soil suction potential data collected over four years to <br /> demonstrate that Forward's alternative ET cover met the performance standards of Title 27 <br /> Section 21090. <br /> Forward constructed a minimum 4-foot thick monolithic soil cover on the north slope of the <br /> Austin Road landfill as an alternative final cover demonstration. The cover was constructed of <br /> clayey silt from an onsite soil borrow area and was hydroseeded with native vegetation seed <br /> mix. Two monitoring stations to collect soil moisture and soil suction potential data at 12-inch, <br /> 24-inch and 36-inch depths were installed. The monitoring stations were installed in July 2006 <br /> and have collected four years of cover performance data. The 2009/2010 rainy season is the <br /> first year with rainfall greater than normal; the test cover has meet expectations in both wet <br /> and dry years. Because the alternative ET pilot cover met the performance standards of Title <br /> 27, Forward is free to discontinue performance monitoring and staff will incorporate the cover <br /> design into the next revision of WDRs. <br /> If you have any questions, please call me at (916) 464-4614 or via email at <br /> ratkinson@a waterboards.ca.gov, <br /> Ross D Atkinson <br /> Engineering Geologist <br /> Title 27 Permitting and Mines Unit <br /> cc: Robert McClellan, San Joaquin County LEA, Stockton. <br /> Gary Lass, Geologic Claremont <br /> Don Litchfield, Forward Inc. <br /> Lochlin Caffey, Forward Inc. <br /> RDA:T:\R5S Sections\Permitting Title 27 Confined Anim21s\_Sta4,f�ratkinso\forward\Etcover4rdYR.doc <br /> California Environmental Protection Agency <br /> .,, <br /> r��P,ecycled Paper <br />