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wa <br /> k _ p •r { <br /> 4 10M 02 <br /> v <br /> gra. N CONIt ^.+�+:�7+ ` <br /> s+ ^e '"7 HSI�j` " "•��`"� -0, �• �i;r•yira�in, x�Jaro'"' x a• �'�-^ ,� Sy <br /> P <br /> BROWN AND CALDWELL _ <br /> CONSUt_7tNG ENGINEERS f ' <br /> JAN ISD9 <br /> January 16, 1989 <br /> CcJ <br /> Mr. Larry William., <br /> Municspul Utilities Department <br /> Rec•,ional Wastewater Contrul Facility <br /> 1500 Navy Drive <br /> Stockton, California 95206 <br /> 017-3173-04/1 <br /> Subject: ARCO Station 2133, 2908 Benjamin Holt Drive, <br /> Stockton, California--Recovery System Water Sampling <br /> Dear Mr, Williams: <br /> Following 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 total <br /> Petroleum fuel hydrocarbons by EPA Method 8015, modified, <br /> Date Sample Benzene, Ethylbenzene, Xylene, Toluene, T„tal petroleum <br /> collected number ug/I <br /> • u g/1 ug/I ug/1 hydrocarbons, mg/1 <br /> 12/20/88 R-1 51.0 2.0 <br /> 5.0 X0.8 <br /> 02 <br /> The benzene concentration in this sample, exceeds the California Department of Health <br /> Services Drinking Water Action Level, of 0.7 parts per billion, established in January 1987. <br /> All other constituents are below the California Regional Water Quality Control Board's, <br /> Centra: 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 /> s <br /> 3 <br /> 723 5 STREET SACRAMENTO,C L'FORHIA 9$a14•7M•(9161 44/•of23 <br />