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Y <br /> S <br /> r <br /> Stockton Plating Inc. <br /> October 10, 7991 <br /> r paQe .9- <br /> 5.0 CONCLUSIONS, OPTIONS AND RECOMMENDATIONS <br /> w F <br /> { 5.1 Conclusions <br /> Laboratory analyses indicates that TPH-gasoline and gasoline <br /> li constituents (BTEX) were dete,ted in SB3 at 20 and 30 feet below <br /> the ground surface. BTEX was detected in SB2 at a depth of 20 <br /> feet below ground surface. The presence of gasoline contaminants <br /> in SB2 and SB3 at 20 and 30 feet� suggests that the two� soil <br /> borings are relatively c.Lose to the source of gasoline. BTEX <br /> concentrations were detected at 45 feet below the ground surface, <br /> ( <br /> probably near the capillary-fringe,: in soil borings SB2, SB4, SB5 <br /> and SB6. This ,indicates that .the gasoline contaminants had <br /> ' ! migrated outward on the water table. <br /> E <br /> In each of the soil borings, greyish-green stained sail was <br /> encountered at a depth of approximately 7.5 feet below the ground <br /> i <br /> surface down t,) the capillary fringe at 50 feet. The soil in <br /> F=" each boring ` <br /> From approximately 40 to 50 feet had a <br /> } septic/petroleum odor which is common to old Petroleum products <br /> L undergoing biological degradation. Diesel (26 mg/kg) was <br /> detected in SBI at a depth of 50 feet. There is no evidence to <br /> suggest that this relatively flat layer of <br /> Y green petrule-w <br /> W, stained soil was the result of leaking from the SBI <br /> gasoline <br /> tanks located directly above. The stained soil may ba old <br /> a <br /> contamination -- <br /> = - -�,, - -- - :- - -- .grated along-the-water table from <br /> another source and perhaps from an adjacent Property. The <br /> CONDOR <br />