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Chevron U.S.A. <br /> Page 5 <br /> Task I of the study will be useful in helping establish an understanding the site <br /> history, findings of past investigations, and generalized regional geology and <br /> hydro;teology setting of the subject site. The finding of the Literature survey aided <br /> in the focus for the field investigation. <br /> Task' ll consisted primarily of the advancement of sail borings ar;d the <br /> installation of mocitoring wells. The seven soil borings drilled as part of this <br /> investigation wore si,'uated partially adjacent to and down gradient of areas that were <br /> suspected of having the presence of petroleum o.,ontamination. These areas included <br /> underground storage tank;and product lines. For the purpose of this investigation, <br /> each area was adC.--ssec!in0vidually and assessed -)iatiy with data obtained from <br /> other areas of the site. <br /> The seven monitoring we'is in�tallm!as part of this investioalion were located <br /> to help evaluate the presence of hydrecat`ion contamination in groundwater, possible <br /> point-sources of contamination and leteral migration. The mcnito.Ing wells and boring <br /> locations are shown on the Site Map,imt:luded as Plate 2 of this report. <br /> The purpose of the borings and groundwater moi•icnring wells was thrse-fold, to <br /> log subsurface conditions for the purpose of in'erpreting Ahologic and structural <br /> _ conditions,to obtain soil and groundwater sampf%s for Cie purpose of laboratory <br /> chemical analysis and to obtain groundwater elevat'-)n data for.*re purpose of <br /> calculating an interpreted groundwater gradient and fmw directir-in the area. <br /> ieoao-zaa-ou <br />