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kn KLEINFELDER <br /> August 7, 1987 n <br /> File: 24--2061 <br /> Q <br /> Mr. Dwight Beavers � RU <br /> H AS-Nli <br /> Industrial Asphalt ErlV1RO 5ERv10ES <br /> P.O. Box 2263 <br /> Irwindale, CA 91706 <br /> SUBJECT: Environmental Soil Sampling at Industrial Asphalt Facility <br /> East of Linden, California <br /> Dear Mr. Beavers: Z 1&& D&e- <br /> As requested by. Industrial Asphalt, Kleinfelder is pleased to present this <br /> letter report . of the environmental soil sampling performed at your <br /> facility east of Linden, California. Plate 1 is a site location map. The <br /> objective of this work was to obtain a soil sample with proper protocol, <br /> provide for chemical analysis, and document the results. <br /> Field Activities <br /> On June 19, 1987, two trenches were excavated to a depth of 8 feet at the <br /> site where an underground diesel storage tank had previously been <br /> removed. A representative of San Joaquin County Department of Health . <br /> Services was present during excavation and . sampling. The County <br /> representative approved the sampling location,depth and planned chemical <br /> analysis. <br /> After reaching the required depth, soil was qualitatively field screened <br /> for petroleum hydrocarbons. The screening procedure is as follows: (1) <br /> The photoionization detector (PTD) is calibrated with air spiked with a <br /> known concentration of benzene. (2) Approximately 200 ml of sample is <br /> containerized in a Mason jar and shaken to release vapors. (3) The vapor <br /> head space above the soil is measured by inserting the PID tip through a <br /> small puncture in the lid. Soil from both trenches was screened and zero <br /> readings were observed at each location. <br /> One soil sample was collected for laboratory confirmation in a 6—inch . <br /> brass tube from soil brought to the surface by backhoe bucket, sealed, and <br /> stored in an iced cooler for chemical analysis. The collected sample was <br /> submitted under chain—of—custody to CHEMWEST Analytical Laboratories in <br /> Sacramento for chemical analysis for benzene, toluene, xylene and <br /> petroleum hydrocarbons by modified EPA 8015—diesel fraction. <br />