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a <br /> fi x <br /> ENVIPONMENTAL 1NO x 3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, California 95682 <br /> (530)676-6004 Fax:(530)676-6005 <br /> January 31, 2003 <br /> Project No. 2007-0065-01 <br /> E E B 0 5 2003 <br /> ENVIRONMENT HEALTH <br /> t <br /> Mr. Harlin Knoll PERMIT/SERVICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber,Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> i <br /> Re: Workplan for Vertical Assessment at USA Station No. 65, <br /> 2500 West Lodi Avenue, Lodi, California. <br /> Dear Mr. Knoll: <br /> On behalf of USA Gasoline Corporation(USA), Stratus Environmental, Inc. (Stratus) has <br /> prepared this work plan for vertical assessment at USA Station No. 65, located at 2500 <br /> West Lodi Avenue, Lodi, California (Figure 1). The lateral extent of impact to <br /> groundwater appears to be adequately characterized, and the plume configuration appears <br /> to be stable. As discussed with San Joaquin 'County Public Health Services, <br /> Environmental Health Division (PHS/EHD), Stratus proposes to evaluate the vertical <br /> extent of impact to groundwater prior to initiating closure activity. <br /> This work plan proposes to.use cone penetration testing (CPT) to further evaluate soil <br /> lithologies beneath the site and to collect depth discrete groundwater samples adjacent to <br /> the CPT locations to assess the vertical extent of impact. Locations of the proposed CPT <br /> borings are shown in Figure 2. <br /> BACKGROUND <br /> Information provided in this section is based on reports generated by Pinnacle <br /> Environmental Solutions, Inc. (Pinnacle),.a division of EMCON,.and work completed by <br /> Stratus. <br /> A limited site investigation, completed in March 1987, detected petroleum hydrocarbons <br /> in soil and groundwater beneath the site. The investigation included the drilling and <br /> sampling of four soil borings; two of which were completed as.groundwater monitoring <br /> wells (S'-1 and S-2). In.August 1987, three additional groundwater monitoring wells <br /> (MW-1, MW-2, and MW-3) were installed. Additional monitoring wells (MW-4, MW-5, <br /> MW-6, MW-7, and MW-8) were installed to assess the lateral extent of petroleum <br /> hydrocarbon impact to groundwater. Figure 2 presents the locations of all of the <br /> i <br /> PAUSA Gasoline100651Workplanslusa65-cpt-workplan.doe <br /> 4 <br />