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�. VAPOR EXTRACTION SYSTEM OPERATION <br /> 7-ELEVEN STORE <br /> 9110 THORNTON AVE. <br /> STOCKTON, CA <br /> i <br /> Table 1, <br /> i s OVA 128-GC VAPOR CONCENTRATIONS OF VAPOR EXTRACTION WELLS ppm <br /> WELL NUMBER <br /> RW-1 MW-1 MW-3 + MW-4 + VP's MW-3 MW-4 <br /> 1-05 2,400 3,800 900 140 <br /> i 1-08 3,200 2,600 600 2,400 12 <br /> 1-10 >1,000 >1,000 >1000 ---- ---- <br /> 1-12 520 850 ---- 200 ---- <br /> 1-16a * 640 ---- 280 360 <br /> •" 1-19 680 990 ---- 200 350 <br /> ,< 1-23 260 625 ---- 165 280 <br /> * Ground water pump taken out of well with cap for repair. <br /> MW-4 vapor conduit was blocked, repaired and placed on dedicated blower. <br /> E, On January 12 the old VES system wells turned off and only MW-3 left online (dedicated blower). <br /> i All OVA 128-GC vapor concentrations are expressed in parts per million as methane. The OVA 128-GC <br /> The OVA is calibrated to 96.5 parts per million methane in zero gas air. The calibration correlates well <br /> with mg/m3 of gasoline in air by comparison to SKC carbon tube analyses. <br /> 9 <br /> VAPOR EXTRACTION TECHNOLOGY, :NC. <br />