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Fjij <br /> Ms . Casey Foley <br /> January 29, 1991 <br /> P Page 3 <br /> 4 The results of the laboratory analyses indicated that <br /> there were low to non-detectable concentrations of <br /> contaminants in soil samples below the locations of the <br /> P, 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 /> Fppm) ; 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 /> F, <br /> isomers. Heavy metals were present in sample S-8. 5-1 at <br /> i acceptable concentrations thoughi 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 graven 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 th-e 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 sail near the dispenser . <br /> a <br /> Samples from the borings showed no detectable TPHg or BTEX. <br /> Th�ar�ea of' the farmer .dispenser and sample S-2 C was; <br /> excavatyed using Ta bacckhoe;,op.era.t_ d-_' by+-RAMCON The <br /> excavation proceeded until field evidence and field <br /> Finstrument (photoionizing organic vapor meter) readings <br /> showed no indication of contamination. Five soil samples <br /> Fwere collected from the walls and base of the excavation <br /> using hand sampling equipment . The 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 compoundis . <br /> ROGER FOOTT ASSOCIATES, INC. <br />