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� € . ME�,L`M <br /> 3 id <br /> �'`:C 'd '�aui •;#, rr. i.7�8.:..Y' ..« .F <br /> ff <br /> v <br /> ��!vv55 J ,Tr!q��e�u'vyrgo�ao�a <br /> A trt 5\t,(r+mp rill <br /> rn irnrunr•�lal Snitttiuns <br /> 7hrnt{Gh Apf;iinJ Sricrur, <br /> �,,;_,.:� ;IIr} (;nl[!(,t!n(I[)ri�r, tiuiir_'1ll) lr>,;inrrriroy,C C-wafrurlirrn <br /> #,Inc ht (nrclrn,t,(A V fr e) <br /> 11\ I')16i 8,2-06M <br /> December 18, 1991 <br /> Mr. Bob Boust <br /> Unocal Corporation <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Subject: Quarterly Ground-Water Monitoring, Third Quarter 1991, at Former Unocal <br /> Service Station No. 3859, 1665 Pacific Avenue, Stockton, California. <br /> Mr. Sisk: <br /> This report summarizes the results of the third quarter 1991 ground-water monitoring that <br /> RESNA Industries (RESNA, formerly Applied GeoSystems) conducted at the request of <br /> < . Unocal Corporation (Unocal) at the subject site. The site location is shown on the Site <br /> Vicinity Map (Plate 1). The purpose of quarterly sampling is to monitor changes in <br /> concentrations of dissolved gasoline hydrocarbons in the ground water and changes in the <br /> groundwater gradient. <br /> ra <br /> The work for this monitoring phase included subjectively analyzing ground water in two <br /> monitoring wells (wells MW-4 and NIW-5) and collecting and analyzing ground-water <br /> samples for dissolved hydrocarbon constituents. We did not collect water samples from <br /> wells MW-1 through MW-3 or measure depths to water because these wells were dry. As <br /> a result, we could not evaluate the ground-water gradient beneath the site. The locations <br /> of the monitoring wells are shown on the Generalized Site Plan (Plate 2). <br /> b� <br /> BACKGROUND <br /> Five soil borings were drilled at the site in January 1988 as part of a subsurface <br /> environmental investigation conducted by J.I , Kleinfelder & Associates (Kleinfelder) of <br /> Sacramento, California. Results of that investigation indicated that hydrocarbons were <br /> present in soil underlying the site (Kleinfelder, March 3, 1988, Report No. 24-2081-01). <br /> 6830rsis <br /> 3R�E2-7 <br /> j <br />