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California Regional Vater Quality Co -tyol_Board <br /> Central ValleN Region ;►% � � `��_�% <br /> Steven T. Butler, Chair <br /> \\ inston H. Hickox Gra% Darin <br /> Sacramento Main Office Garrnnir <br /> �nnrorunervar Internet Address: Impar���%�rs�rrchta.eo%i—nrgcbi <br /> Po orrrnar 3143 Routier Road.Suite A.Sacramento.Ca Ii tomia 958'_7-3003 <br /> Phone(Q 10) 25 -3,000•PAX(Q Ilil'::-3015 <br /> APPROVED <br /> 9 February 2000 ( � <br /> author= <br /> senic <br /> Miriam L. Barbonio <br /> Chevron Chemical Company LLC <br /> P. O. Box 6047 <br /> San Ramon, CA 94583-0947 <br /> UNDERGROUND STORAGE TANKS, KOPPEL STOCKTON, SAN JOAQUIN COUNTY <br /> I spoke with Mr. Michael Infuma of San Joaquin County Public Health Services on 4 February 2000 <br /> concerning a request for closure on the removal of two diesel fuel tanks that apparently were removed in <br /> 1989 between the former bagging plant and monitoring well KP-3. We agreed that the Regional Board <br /> will act as lead agency on the closure, since we are already working with you on the nitrate and <br /> ammonium constituents at the site. <br /> As I understand the history, diesel contaminants were found at 65 mg/kg in the headspace.of a soil <br /> sample obtained in 1989. Mr. hifuma wrote letters requesting further analyses in 1990, 1992 and 1993, <br /> all of which went unanswered. He suggested that since monitoring well KP-3 is the nearest <br /> downdradient well from the former tank site that this well could serve as the indicator of residual <br /> petroleum contamination. <br /> Please obtain a groundwater sample from KP-3 and all on-site water supply wells. Analyze them for <br /> total petroleum hydrocarbons as diesel using EPA method 8015M, and benzene, toluene, ethylbenzene <br /> and xylene (BTEX) using EPA method 8020, and gasoline oxygenates using EPA method 8260. Note <br /> that some laboratories are able to analyze the above suite of petroleum hydrocarbons with EPA Method <br /> 8260, which is also acceptable. <br /> California Environmental Protection Agency <br /> j Recycled Paper <br />