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O.I.S. - Stockton Plating Inc. <br /> Ontflhtr 10, 1991 <br /> I Page -9- <br /> r� <br /> 1 <br /> f` <br /> r <br /> 5,0 CONCLUSIONS, OPTIONS AND RECOMMENDATIONS <br /> 5.1 Conclusions <br /> Laboratory analyses indicates that TPH-gasoline and gasoline <br /> constituents (F3TBX) were detected in SB3 at 20 and 30 feet below <br /> the ground surface. BTEX was detected in SH2 at a depth of 20 1 <br /> feet below ground surface. The presence of gasoline contaminants <br /> in 582 and SB3 at 20 and 30 feet suggests that the two soil <br /> borings are relatively close to the aource of gasoline. BTEX <br /> concentrations were detected at 45 feet below the ground surface, <br /> probably near the capillary fringe, in soil borings SB2, 534, SBS <br /> and SBS. This indicates that the gasoline contaminants had <br /> migrated outward on the water table. <br /> ( Ill <br /> In each of the soil borings, greyish-green stained soil was <br /> 1' encountered at a depth of approximately 25 feet below the ground <br /> surface down to the capillary fringe at 50 feet. The soil in <br /> 1 each boring from approximately 40 to 50 feet had a <br /> la <br /> septic/petroleum odor which is common to old petroleum products <br /> nn <br /> dergoing biological degradation. Diesel (26 mg!?sg) was <br /> detected in SB1 at a depth of 50 feet. There is no evidence to <br /> suggest that this relatively flat layer of green petroleum . <br /> f <br /> stained.soil was the result of leaking from the SPI gasoline <br /> L" tanks located directly above. The stained soil may be old . <br />=- ` —contamination_that_has_migrated along the water table from <br /> �. <br /> another source and perhaps from an adjacent property. The. <br /> i.' <br /> CONDOR <br /> E - <br />