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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-51A^�` .\YL`^ <br /> Linda S.Adams (916)464-3291 • FAX(916)464-4645 (V'E E Brown Jr. <br /> Acting Secretary for http://www.waterboards.ca.gov/centralvalley Governor <br /> Environmental Protection <br /> APR 19 2011 <br /> ENVIRONMENTAL HEALTH <br /> PERMF/SERVICES <br /> 15 April 2011 <br /> Mr. Reyes Franco <br /> Pilkington North America, Inc. <br /> P.O. Box 128 <br /> Lathrop, CA 95330 <br /> SOIL INVESTIGATION REPORT COMMENTS, PILKINGTON NORTH AMERICA, <br /> LATHROP, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Central Valley <br /> Water Board) have reviewed the 30 March 2011 Soil Investigation Report (Report) <br /> submitted on your behalf by Condor Earth Technologies. Pilkington North America <br /> (PNA) discovered a leaking underground fuel line in 1996. Initial response actions <br /> removed about 5,000 gallons of TPH from the water table. Since 1996 an additional <br /> 225 gallons of diesel fuel has been skimmed from recovery wells. PNA submitted <br /> the Report in response to the 7 September 2010 Central Valley Water Board staff <br /> letter requesting investigation of possible additional source areas of diesel <br /> petroleum hydrocarbon (TPHd) pollution. <br /> The Report contains the results of 12 geoprobe soil samples obtained and an <br /> inspection of existing above ground tanks and fuel lines. The investigation shows <br /> that residual soil contamination is highest near the site of the original release and <br /> near utility corridors that may have served as permeable pathways for the released <br /> fuel. The inspection confirmed that all existing fuel lines are above ground and <br /> accessible to visual inspection. None of the above ground storage tanks or fuel <br /> lines had any visible evidence of leakage. <br /> The Report concludes that there is no active release contributing to the residual soil <br /> and groundwater pollution. The Report also provides a calculation that estimates <br /> over 5,000 gallons of TPHd remain in the soil, and recommends that diesel recovery <br /> operations continue on the established weekly to monthly schedule. <br /> Central Valley Water Board staff concur with the conclusions of the Report, and <br /> concur with continuing TPH recovery and semi-annual monitoring. However, <br /> because less than 15 gallons of TPH are being recovered annually it will take an <br /> excessive amount of time to remediate the polluted soil and groundwater. There are <br /> a variety of measures that could be implemented to accelerate the remedial <br /> process. By 2 May 2011, PNA needs to provide a schedule under a feasibility study <br /> of additional measures to recover TPH, enhance biodegradation, or both, will be <br /> California Environmental Protection Agency <br /> edRecycled Paper <br />