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'r <br /> r <br /> q <br /> i <br /> I <br /> i <br /> i <br /> f <br /> 4.0 <br /> f <br /> CONCLUSIONS <br /> C <br /> !� The investigation described in this report evaluated the extent of petroleum hydrocarbon <br /> ' Contamination and its impact ;if any) on the soil and groundwater near the gasoline tank <br /> excavation. The following paragraphs present our conclusions related to our investigation. <br /> f [ f <br /> i 4.1 SOIL <br /> TPH. EIevated levels of TPH (gasoline)were not encountered in <br /> the analyzed sal] samples <br /> collected during the subsurface sail investigation. The analytical results.for these samples <br /> were below the detection limit of the analysis(0.5 mg/kg). No evidence of TPH(gasoline) <br /> t soil contamination was detected in the soil samples collected during this investigation in the <br /> area adjacent to the gasoline tank excavation. <br /> BTEX. Elevated levels of toluene and ethyl benzene were not encountered in the soil <br /> samples analyzed. The analytical results for these :ampler were below the detection limit <br /> «� of the analysis (5 pglkg for both toluene and ethyl benzene). Detectable levels of benzene <br /> were encountered in four of the nine samples analyzed. The highest concentration cf <br /> " benzene encountered in each boring corresponds to the soil sample with the highest <br /> {` headspce VOC concentration. These samples were collected at a depth of 51.1 to 51.5 feet <br /> ' > in MW-1 (30µg/kg), 50.6 to 51.0 feet in MW-2 (6,ug/kg)and 55.6 and 56.0 reet in MW-3 <br /> (76 µglkg). Detectable levels of total xylenes were encountered in three of nine samples <br /> analyzed,in two of the borings(MW-1 and MW-3). These samples were collected in MW-I <br /> at a depth interval of 51.1 to 51.5 feet(33 µg/kg)and in MW-3 at depth intervals of 41.1 <br /> to 11.5 feet(270 p. /kg)and 55.6 and 56.0 feet(42µg/kg). No elevated level of BTEX was <br /> encountered in a:iy of the soil samples collected just above the gro+andwater interface..> <br /> , <br /> Ut'W. The analytical results for lead ranged from 2.8 mg/kg to 9.7 mg/kg. These <br /> concentrations are believed to correspond to naturally 0C. erring lead levels in the soil. <br /> 91CO238A-/5,W0RbtART.WP 1409.91l1•1Ln 4-1 <br /> L <br /> I . <br /> 1 <br /> { <br /> i <br />