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WEISS ASSOCIATES Consulting in Geology & Geohydrology <br /> 2054 University Ave., Suite 301/Berkeley, CA 94704 415-644-3281 <br /> Q�gca419bo T <br /> 19 <br /> MAY o <br /> ENVIRO MENTAL yEALTM <br /> 14 May 1986 . PERMIT/SERVICES <br /> H. B. Swearingen <br /> Parsons of California <br /> P.O. Box 6189 <br /> Stockton, CA 95106 <br /> Re: Parsons of California <br /> Soil Sampling Analysis <br /> Job No. 86-195 <br /> Dear Mr. Swearingen, <br /> This letter is the brief description, which you requested on 7 May, of <br /> the analytical results from the 18 April soil sampling. The soil samples were <br /> collected from approximately 2-3 feet beneath the gasoline tank excavation at <br /> Parsons of California, South Airport Way, Stockton, California. Soil sample A <br /> from below the fill pipe end of the tank was analyzed for petroleum <br /> hydrocarbons, specifically benzene, toluene, xylenes and total hydrocarbons, <br /> using a gas chromatograph. Soil sample B from below the middle of the tank <br /> was held and not analyzed. Soil sample A analytic results transmitted to you <br /> by Nick Bokides of Precision Industries were reported as follows: <br /> Total Hydrocarbons < 10.0 mg/kg <br /> Benzene < 0.5 mg/kg <br /> Toluene < 0.5 mg/kg <br /> Total Xylenes < 1.0 mg/kg <br /> These results indicate that soil sample A was below detection for the <br /> compounds analyzed. <br /> For underground tank investigations the City of Stockton refers to <br /> guidelines set forth in Appendix 4: Water Quality Objectives and Hazardous and <br /> Designated Levels for Chemical Constituents, July 1985, authored by John <br /> Marshak of the California Regional Water Quality Control Board (RWQCB) in <br /> Sacramento. These guidelines were not written for the initial testing step(s) <br /> for underground tanks as performed for your site, but for guidance once a <br /> problem is confirmed. The guidelines are for clean-up purposes only. <br /> A Dioision of Aguarierra Associa s Incorporated <br />