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• April 15, 1993 Working To Restore Nature <br /> i ARCO Service Station No 2076, Lodi, California <br /> treatment alternatives, if applicable Results indicated vapor extraction is a feasible method <br /> of remediating soil at this site, if necessary <br /> Removal of Underground Storage-Tanks-and Product Lines <br /> In November 1991, RESNA observed the removal of five gasoline-storage tanks and <br /> associated product lines (RESNA, June 26, 1992) After the tanks were removed, two <br /> vertical trenches were excavated to 14 feet below grade (approximately 2 feet below the <br /> base of the former tanks) under each former tank Two soil samples were collected from <br /> under each tank, and a soil sample was collected from the eastern sidewall of the tank cavity <br /> next to the station building (Plate 2) Results of chemical analyses of soil samples collected <br /> from the former gasoline tank cavity are presented in Table 2 Pursuant to RESNA's Work <br /> Plan (September 1991), the tank cavity was not over-excavated <br /> Soil beneath the former product and vapor-return lines near the dispenser islands was <br /> excavated to between 1 to 4 feet below grade Soil samples were collected from the <br /> product-line trenches Our geologist noted vapor pots adjacent to the former product lines <br /> and discoloration of soil at the location where one sample was collected (S-3-PL1) <br /> Additional soil samples were collected beneath the product lines on December 2 and <br /> December 4, 1991 Sample locations are shown on Plate 2 Results of chemical analyses <br /> of soil samples collected from the former product-line trenches are presented in Table 3 <br /> i <br /> sooaa-s 4 <br />