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1 _ <br /> .T131 c'8 191 10: 1:3 =l'i� 6^ � � � <br /> „�- �- ��t-'.3 HLA C't=,I�a�f.�F'La � <br /> u <br /> I <br /> I <br /> Harding Lawson As,00Wes <br /> I - <br /> June 28, 1.991 <br /> i <br /> 20548, 001.03 i <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health 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 /> Stockton, California <br /> 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 0ur ,telephone <br /> Conversation on June 26, 1991, you requested, additional <br /> information concerning the above refereraced 'Work Plan. The <br /> following paragraphs present this additi�o.nal: information. <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, :` proper disposal method <br /> will be selected. <br /> A typical well construction detail diagraza is <br /> attached. As shown on the diagram', the well top of <br /> casing is housed in a 12-inch imco-Wheaton monitoring <br /> well how. Additionally, a lockingil expansion plug <br /> seals the top of the casing. <br /> I <br /> Soil samples will be collected at five .foot intervals <br /> from each well boring and every sample will be <br /> screened with a photoionizatioh device (PTD) . The two <br /> soil samples with highest PTD readings will be <br /> submitted for chemical analysis. if no positive <br /> readings are detected by the PTD while screening the <br /> soil samples, we will then subinit soil samples from <br /> Er,q-teenno*rip 1355 Mlwi Vijay, cuitg 100,ccrccrd,::r` 94U0 {15/t -9660 <br /> Cry. r nentel SG.rvi�C, I q.i h-d" r r/HardJ,rg iic 06''x s.O%f'rr Alurrun•tidr <br /> �I <br />