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1 <br /> Harding Lawson Associates <br /> June 28, 1991 <br /> 5';r m ., <br /> 20548,' 001. 03 <br /> San Joaquin County J U L 1991 <br /> Public Health services ENVIRONMENTAL HEALTH <br /> Environmental Health Services PERMIT/SERVICES <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Attention: Ms, Margaret Lagorio <br /> ! Ladies and ,Gentlemen: <br /> Work Plan Amendment <br /> Soil and Groundwater Investigation <br /> Cozad Trailers <br /> j Stockton, California <br /> I This letter presents amendments to a Work Plan dated June 14, <br /> 1991, for a soil and groundwater investigation at the Cozad <br /> Trailer manufacturing facility. During our telephone <br /> conversation on June 26, 1991, you requested additional <br /> information concerning the - above referenced Work Plan. The <br /> following paragraphs present this additional information. <br /> i <br /> - Purged groundwater generated from developing the <br /> monitoring wells will be contained in 55-gallon <br /> ! Department of Transportation certified drums. After <br /> receiving. analytical results, a proper disposal method <br /> will be selected. <br /> - A typical well construction 'detail diagram is <br /> attached. As shown on the diagram, the well top of <br /> casing is housed in a 12-inch Emco-Wheaton monitoring <br /> well box. Additionally, a locking expansion plug <br /> seals the top of the casing. <br /> f - Soil samples will be collected at five foot intervals <br /> from each well boring and every sample will be <br /> screened with a photoionization device (PID) . The two <br /> soil samples with highest PID readings will be <br /> submitted for chemical analysis. If no positive <br /> readings are detected by the. PID while screening the <br /> soil samples, we will then submit soil samples from <br /> t <br /> Engineering and 1355 Willow Way, Suite 109, Concord,CA 94520 415(687-9660 <br /> Environmental Services A Sab,tidiary of Harling Associates•Offire Nwim ide <br /> J , <br /> A <br />