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BROWN AND CALDWELL <br /> 'nt1C,_ <br /> 1 CONSULTING ENGINEERS <br /> November 2, !988 <br /> Mr. Larry Williams <br /> Municipal Utilities Department <br /> Regional Wastewater Control Facility <br /> 2500 Navy Drive <br /> Stockton, California 95206 017-3173-04/1 <br /> Subject: ARCO Stztion 2133, 2908 Benjamin Holt Diive, <br /> Stockton, California--Recovery System Water Sampling <br /> Dear Mr. Williams: <br /> Enclosed are the laboratory results of the latest recovery system water sampling for the <br /> subject site. The water sample was collected directly from the discharge valve between the <br /> pump and the separator tank. The sample was analyzed for benzene, ethylbenzene, toluene, <br /> and xylene by U.S. Environmental Protection Agency (EPA) Method 602 and !otal <br /> petroleum fuel hydrocarbons by EPA Method 8015, modified. The benzene concentration <br /> in this sample exceeds the California Department of Health Services Drinking Water Action <br /> Level, of 0.7 parts per billion, established in January am1987. A!1 other constituents a <br /> below detection limits or below the California Regional Water Quality Control Board, <br /> �- Central Valley Region suggested levels in a liquid for the protection of groundwater quality <br /> (revised September 1987). All constituents are below the Wastewater Control Facility's <br /> (WCF) maximum allowable concentrations outlined in the April 1988 WCF Interim Policy. <br /> If you have any questions or comments regarding these results or the subject site, please <br /> contact me Ms. Patti De La O at (916) 444-0123. <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> U � � <br /> E. Phillips <br /> Project onager f <br /> LEP:PYD:mrp <br /> Enclosure <br /> cc/enc: Ms. Laurie Coutlla, San Joaquin County Local Health District, Stockton <br /> Mr. Kyle Christie, ARCO Products Company, San Mateo <br /> s <br /> 723 5 STREET SACRAMENTO,CALIFORNIA 8561.7097.1916)411,0123 <br />