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I <br /> VAPOR EXTRACTION SYSTEM OPERATION <br /> 7-ELEVEN STORE <br />' 9110 THORNTON AVE <br /> STOCKTON,CA <br />' Table 6 <br /> INITIAL SKC CHARCOALTUBE ANALYSES OF VES WELLS <br />' Well TPH as Gas Benzene Toluene Ethyl Benzene Total Xylenes <br /> mg/m3 mg/m3 mg/m3 mg/m3 mg/m3 <br />' RW-1 220 N D 90 N D 15 <br /> MW-11 4,800 21 14 130 590 <br /> MW-3 1,500 3,5 68 10 31 <br />' MW-4 120 N D 3 2 N D 16 <br /> VP-1 10 ND ND ND 19 <br /> VP-2 340 12 18 27 13 <br /> VP-3 ND ND ND ND ND <br /> VP-4 10 ND ND ND ND <br />' All samples were obtained on January 5, 1990 by sampling the regenerative blower <br /> exhaust during individual isolation of each well on the blower MW-4 results are low due to a plug and break <br /> in the vapor line preventing flow of extracted vapor from well to the blower which was later corrected <br /> N D = not detected <br />' Table 7 <br /> FINAL SKC CHARCOALTUBE ANALYSES OF VAPOR EXTRACTION WELLS <br />' Well TPH as Gas Benzene Toluene Ethyl Benzene Total Xylenes <br /> Mg/M3 mg/m3 mg/m3 mg/m3 mg/m3 <br /> 1 <br /> MW-1 140 ND ND ND ND <br />' MW-4 110 ND ND ND ND <br /> i All samples were obtained on January 29, 1991 by sampling the regenerative blower <br /> exhaust during individual isolation of each well on the blower <br /> iN D = not detected <br /> i <br /> i <br /> i <br /> VAPOR EXTRACTION TECHNOLOGY, INC <br />