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Ms . Casey Foley <br /> January 29, 1991 <br /> Page 3 <br /> The results of the laborato y analyses indicated that <br /> there were low to non-detectable concentrations of <br /> contaminants in soil samples below the locations of the ' <br /> 1 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 /> 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 /> isomers. Heavy metals were present in sample S-8. 5-1 at <br /> acceptable concentrations thought to represent background, <br /> uncontaminated concentrations , based on our experience. <br /> With the approval of the San Joaquin Local Health District, <br /> RAMCON backfilled the excavation with clean pea gravel and <br /> covered it with concrete. <br /> With the permission of the SJLHD 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 /> borings in locations corresponding to the previous samples <br /> and excavation of contaminated sokil near the dispenser . <br /> a <br /> samples from the borings showed no detectable TPHg or BTEX. <br /> excavated usi " hoe o erate�d b IRS sample 5-2--4 wasti; <br /> - The area of the former dispenser and <br /> MP y CON. The <br /> excavation proceeded until field evidence and field <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 . �he 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 /> I concentrations of these compounds . <br />�k <br /> y <br /> ROGER FOOTT ASSOCIATES, INC. <br />