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Ms . Casey Foley <br /> January 29, 1991 <br /> r Page 3 <br /> The results of the laboratory analyses indicated that <br /> F there were low to non-detectable concentrations of <br /> contaminants in soil samples below the locations of the <br /> former storage tanks and lines . Low concentrations of -TPHg <br /> were detected in samples S-8 . 5-1 {2 . 3 ppm) and S--13-2 (1.1 <br /> F! ppm) ; 0 . 4 ppm xylene was detected in S-8 . 5-1 . Sample S-2-4 <br /> was found to contain 14 ppm TPHg, 1 . 2 ppm benzene, 2 . 2 ppm <br /> toluene, 0 . 2 ppm ethylbenzene, and 1 . 5 ppm total xylene <br /> y isomers. Heavy metals were present in sample S-8. 5-1 at <br /> acceptable concentrations thought to represent background, <br /> I ;€ uncontaminated concentrations, ba ed on our experience. <br /> With the approval of the San Joaquin Local Health District, <br /> RAMCON backfilled the excavation with clean pea graver and <br /> covered it with concrete. <br /> Pi <br /> With the permission 'of the S LHD and because TPHg and <br /> BTEX detection limits found in samples from the tank cavity <br /> were considered unacceptable by the county, Roger Foott <br /> Associates, Inc . , observed the drilling of three soil <br /> rborings in locations corresponding to the previous samples <br /> and excavation of contaminated soil near the dispenser . <br /> F <br /> Samples from the borings showed �no detectable TPHg or BTEX. <br /> The area of the former dispenser and sample S-2-4 was <br /> excavated using a backhoe operate) by RAMCON . The <br /> excavation proceeded until field evidence and field <br /> Fli <br /> instrument (photoionizing organic vapor meter) readings <br /> showed no indication of contamination. Five soil samples <br /> were collected from the walls and base of the excavation <br /> using hand sampling equipment . Tie samples were collected <br /> from the undisturbed soil at the limits of the excavation. <br />' . The samples were each analyzed for TPHg and BTEX by Mobile <br /> Chem Labs. . None of the samples showed detectable <br /> concentrations of these compounds . <br /> F <br /> F <br /> ROGER FOOTT ASSOCIATES, INC. <br />