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IVAPOR EXTRACTION SYSTEM OPERATION <br /> 7-ELEVEN STORE <br /> 9110 THORNTON AVE <br /> STOCKTON,CA <br /> TABLE 4. <br /> I MW-4 <br /> OVA Concentrations TPH a Gas Benzege Toluege E Begzene Xyleps Flow Vacuum <br /> Date (ppm as Methane) (mg/M ) (mg/M ) (mg/M ) Cmg/M ) (mg/ ) (SCFM) (in H20) <br /> I 1-05 800 120 ND 3 2 ND 1 6 <br /> 1-08 * NA <br /> 1-10 NA NA " -- <br /> 1-12 -- NA -' <br /> 1-16* 360 NA 77 42 <br /> 1-19 350 NA 34 <br /> 1-30 310 NA <br /> 2-05 240 NA -- <br /> 2-26 130 NA -- __ <br /> 3-07 170 NA 35 <br /> 3-14 90 NA 78 36 <br /> 3-21 81 400 NA <br /> 3-27 94 NA -- 37 <br /> 4-04a 150 610 NA =� __ <br /> 4-12 82 NA <br /> 4-24a 120 NA 36 <br /> 5-01b 65 NA NA NA <br /> 5-09 67 NA <br /> 5-16 48 HA <br /> 6-11 72 NA <br /> 6-19 45 NA <br /> 6-29 50 NA <br /> I 7-06 55 NA <br /> 7-25 40 NA <br /> 8-08 18 NA <br /> 8-14c 19 NA <br /> 8-23c 38 NA <br /> 8-30 28 NA <br /> 9-07 30 NA <br /> 9-18 30 NA <br /> 9-22 29 NA <br /> 10-03 32 NA <br /> 10-18 21 NA <br /> 11-01 21 NA <br /> 11-19 16 NA <br />' 1-04-91 19 NA - -- <br /> 1-29-91 16 110 ND ND ND 4 0 <br /> 1-29-91 system turned off <br /> * MY-4 conduit found blocked Conduit repaired on 1-16 <br />' a System off on arrival to site (Main circuit breaker thrown) <br /> b Mu-4 mainfolded with MW-3, VP-2, and VP-3. Returned to original configuration 7-25 (Dedicated blower) <br /> c 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 /> t <br />' VAPOR EXTRACTION TECHNOLOGY, INC <br />