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a <br /> e <br /> Geological Audit Services, Inc. <br /> 1803 W.March Lane,Suite A•Stockton,CA 95207•(209)956-0261•FAX(209)956-0700 <br /> 18 October 1992 <br /> (GeoAudit CV55-59E2-1.32) <br /> Mr. Scott Adrian RKEIVED <br /> Escalon Packers 0 C T 2 1 9692 <br /> 1905 McHenry Avenue <br /> Escalon, California 95320 FINVIRONMENTAL HEALTH <br /> PERM{T/%K1/JCE6 <br /> Subject: Addendum to Preliminary Investigation <br /> and Evaluat?oll Report <br /> Esealo2r, Packers, Inc. <br /> 1905 McHenry AVOnue, Escalon, California <br /> Dear Mr. Adrian: <br /> In accordance with a request from Ms. Linda Turkatte of San Joaquin <br /> PHS/EHD, we have performed additional laboratory analyses to <br /> determine the leachability of diesel contamination from soil <br /> samples at the referenced site. This addendum report presents the <br /> laboratory data as required by EHD. <br /> EHD suggested that one of -the samples collected in May be <br /> reanalyzed, using the California Waste Extraction Test (WET) . <br /> Unfortunately, laboratories typically preserve the samples up to <br /> about three months after they are first submitted, and the May <br /> samples had already been disposed of by the time EHD's request was <br /> received. Therefore, a replacement sample was collected from one of <br /> the barrels of contaminated auger returns that are presently stored <br /> on site. Several barrels were opened and examined, and an attempt <br /> was made to collect as highly contaminated a sample as possible. <br /> This sample was hand-packed into a clean brass tube, capped, taped, <br /> and labeled, and stored on ice pending transmittal to WEST <br /> Labora,.:ories in Davis, CA. <br /> The sample was analyzed for purgeabie petroleum hydrocarbons in the <br /> diesel and oil and grease range in order to obtain baseline data on <br /> total contamination in the sample. The sample was then analyzed <br /> using the WET method to determine what percentage of total <br /> contamination was l.:achable. The chain of custody form and <br /> laboratory report are attached. <br /> The laboratory report indicates that total soil contamination in <br /> this sample is 1,350 mg/kg (ppm) • This is roughly equivalent to <br /> samples of native soil at depths of 10- 15 feet around tho margins <br /> of the underground vault and 20-30 feet beneath the vault. No <br /> contamina etected using the WET method at the detection <br /> -- -------- -lunit-o �i00__myJkg�indicating_that the contamination .is bound up <br /> and not po en iaM_ leachable. <br /> Envircrmental Services•Hy drogeology•Geotechnical Services <br />