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VAPOR EXTRACTION SYSTEM OPERATION <br /> . 7-ELEVEN STORE <br />' 9110 THORNTON AVE <br /> STOCKTON,CA <br />' TABLE 2. <br /> MW-1 <br />' OVA Concentrations TPH as Gas Benzege Toluege E Be9zene Xylenjs Flow Vacuum <br /> Date (ppm as Methane) (mg/M ) (mg/M ) (mg/M ) (mg/M ) (mg/M ) (SCFM) (in H20) <br />' 1-05 6,800 4,800 21 14 130 590 -- <br /> 1-08 2,600 4,100 NA 70 48 <br /> 1-10 1,200 4,700 NA 44 <br /> 1-12 850 4,600 NA -- -- <br /> 1-16 640 NA 70 50 <br /> 1-19 990 NA 46 <br /> 1-30 650 NA <br /> 2-05 450 NA <br /> 2-26 360 NA - <br />' 3-07 260 NA 65 48 <br /> 3-14 150 NA 70 46 <br /> 3-21 160 530 NA <br /> 3-27 160 NA -- 43 <br />' 4-04a 200 770 NA __ <br /> 4-12 150 NA <br /> 4-24a 170 NA 45 <br /> 5-01 130 NA -- -- <br /> 5-09 115 NA 40 <br />' 5-16 110 NA -- 46 <br /> 6-11 110 NA NA NA <br /> 6-19 80 NA <br /> 6-29 65 NA <br />' 7-06 60 NA <br /> 7-25 80 NA <br /> 8-08 54 NA <br /> 8-14b 50 NA <br /> 8-23b 46 NA <br />' 8-30 18 NA <br /> 9-07 18 NA <br /> 9-18 18 NA <br /> 9-22 16 NA <br /> 10-03 16 NA <br /> 10-18 24 NA <br /> 11-01 18 NA <br /> 11-19 21 NA <br /> 1-04-91 21 NA <br />' 1-29-91 21 140 ND NO ND ND -- -- <br /> 1-29-91 System turned off <br /> a System off on arrival to site (Main circuit breaker thrown) <br /> b System turned off for one week to allow any recharge to occur <br /> (System allowed to equilibrate 10 minutes prior to sampling 8-23) <br /> VAPOR EXTRACTION TECHNOLOGY, INC <br />