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NO <br /> =2 NEW=B" Z11115 <br /> VAPOR EXTRACTION SYSTEM OPERATION <br /> 7-ELEVEN STORE <br /> 9110 THORNTON AVE, <br /> STOCKTON, CA <br /> Table 3. <br /> VAPOR.CONCENTRATIONS FROM VAPOR <br /> EXTRACTION WELLS IN m M3 <br /> N- <br /> 1 i <br /> RW-1 MW-1 MW-3 MW-4 VP-1 VP-2 VP-3 VP-4 SYS <br /> 1-05 220 4,800 1,500 120 10 340 <10 10 <br /> 1-08 3,100 4,100 11600 a off off off off 2,800 <br /> Y . 1-10 2,700 4,700 1,300 --- 2,900 <br /> 1-12 2,400 4,600 1,000 --- 2,600 <br /> -.. . 1-15 ----- 31600 1,400 --- 2,300 <br /> i <br /> a MW-4 developed a plug in the vapor conduit which was fixed on 1-12. <br /> All vapor samples were obtained using SKC carbon tubes and SKC sampling pumps. 10 liter vapor <br /> samples were obtained on large SKC tubes at a sampling rate of 1 liter/minute from the positive <br /> pressure side of the blower. Laboratory analysis of the SKC tubes is by NIOSH Method 1500 for total <br /> I hydrocarbons&aromatic volatile organics. Samples were analyzed at Superior Analytical Laborator;es, <br /> Martinez, CA. <br /> i <br /> 11 <br /> VAPOR EXTRACTION TECHNOLOGY, INC. <br />