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TABLE 1 <br /> FIELD MONITORING DATA FOR EXTENDED PILOT VAPOR EXTRACTION TEST <br /> SHELL SERVICE STATION <br /> 4445 PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Date Time Monitor Influent Effluent <br /> Event (ppmv) (ppmv) <br /> 12/05/91 NA 1 89 15 <br /> NA 2 78 13 <br /> NA 3 77 11 <br /> 12/11/91 1222 1 330 14 <br /> 1250 2 310 18 <br /> 1315 3 330 18 <br /> L <br /> 2/13/91 1615 1 280 17 <br /> 1630 2 300 17 <br /> 1645 3 260 14 <br /> NOTES NA = Not available <br /> Influent and effluent concentrations measured with a Foxboro OVA 128 Century Organic Vapor Analyzer <br /> Aegis Environmental Inc <br /> January 6 1992 <br />