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•d.1 F _ P � b.. , <br /> p W <br /> WAnazW"(K C"161 �r <br /> �� Im irunrouerL+!Sn1rrlipas <br /> A RJSNA CumJ�an) <br /> rhrurrgl+.tpplirrf Stir+Ir'[' <br /> ,, rn}inccrinq&CUr+gJrJJC1l0r1 <br /> l <br /> 1710 Mail, Sure[ IJ <br /> ('A 953211 December 24, 1991 <br /> k'hune', (209) 918} 35117 <br /> F,n; f.�119J E38-35U'J <br /> Ms. Linda Turkatle <br /> San Joaquin County INI'lic ile;llth Services <br /> 1'.0. Box 2009 <br /> Stockton, California 95201 <br /> It I-": Quarterly Monitoring Report, October through December, 1991, Laidlaw <br /> Lewis Drive, Stockton, California, Site Code 2454. <br /> Corporation, 1 144 Tillie <br /> Bear ms. Turkatte: <br /> 'Phis letter is being submitted by RCSNA Industries on behalf of Laidlaw Corporation to present <br /> the results of our 1991 fourth quarter groundwater monitoring and sampling at the above <br /> referenced site (Figure 1). <br /> BACKGROUND <br /> t <br /> On June 29, 1990, one underground xylene storage tank was removed at the project site(Figure <br /> 2) by Selnco Corp. of Modesto, California. Soil Samples were collected beneath the tank and <br /> analyzed for benzene, toluene,ethylbenzene, xylenes(BTEX),and total petroleum hydrocarbons <br /> as gasoline (TPHG), by BC Laboratories, Inc., utilizing appropriate EPA and MIS <br /> methodologies. Laboratory results indicated that soils beneath the former tank location had been <br /> impacted by an unauthorized release. Soil analytical results are summarized in Table 1. <br /> To prevent the contaminated material associated with the former xylene tank from presenting a <br /> continued threat to groundwater, approximately 750 cubic yards of contaminated soils were <br /> excavated from the project site. All xylene contaminated soils were excavated except where <br /> physical barriers prohibited. Groundwater was encountered at approximately 15 feet below <br /> ithin the satur^red zone were not excavated. Verification <br /> grade during the excavation- Sails w <br /> soil samples were collected from the excavation side walls. Soil analytical results are <br /> summarized ill Table 1. <br /> To assess the lateral and vertical extent of soil contamination associated with the former xylene <br /> tank, three soil borings (MW1, MW21 MW3) were advanced at the site. The borings were <br /> wells to assess the impact on groundwater beneath the site. <br /> subsequently converted to monitoring <br />