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r <br /> MURRAY & ASSC.`'."FATES <br /> �. ENVIRONMENTAL SERVICES <br /> t4W FAME <br /> James M. Langston <br /> April 7, 1992 <br /> Page 3 <br /> [? <br /> S , <br /> Table 1 <br /> Field Vadose Readings (580B PID) <br /> Boring No. Total Depth PID Reading <br /> . SB-6 9 Ft. 860 <br /> SB-6 14 Ft. 976 <br /> SB-6 17 Ft. 853 <br /> a SB-7 9 Ft. 0 <br /> SB-7 14 Ft. 0 <br /> SB-7 17 Ft. 0 <br /> SB-8 9 Ft. 0 <br /> + SB-8 14 Ft. 0 <br /> SB-8 17 Ft. 0 <br /> , lU PID reading listed in Table 1 represent the maximum reading registered by the 580B <br /> during the screening of each sample. Although PID readings do not precisely correspond <br /> to chemical analysis the readings approximate the amount of gasoline present in the soil <br /> in parts-per-million (ppm), of total petroleum hydrocarbon products. <br /> Summary <br /> As the above analyses indicate, a significant amount of gasoline remains in the vadose zone <br /> soil at the site. Only borings SB-3, SB-7 and SB-8 appeared to be free of significant <br /> amount of total petroleum hydrocarbons. Due to the shallow depth of the water table <br /> (17.5 feet), it is therefore not surprising to find that groundwater quality has been impacted <br /> by the release of nearly 1,200 gallons of gasoline from the failed underground fuel tank. <br /> Barings SB-5 and SB-6 were drilled directly beneath the center and the failed end of the <br /> former tank respectively. The highest PID readings were found throughout the soil column 7 <br /> in these to locations, confirming that the source of the gasoline in the soil originated from j <br /> the former underground fuel tank. _ ] <br /> I _m <br /> r <br /> i <br />