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5 5 1 Vapor Sampling <br /> Influent vapor samples were collected near the beginning and end of the pilot test Samples A-0610- <br /> 11 and A-0610-E1 were collected at approximately 20 minutes following the post-hiatus time zero <br /> Sample A-0610-I2 was collected at 200 minutes The influent samples (I1 and I2) were collected <br /> from an ]n-line sampling port on the extraction well using an electric pump Vapors were drawn <br /> through the sampling port by the pump and passed through Tygon® tubing into tedlar sample bags <br /> The tedlar sample bags were labeled and placed in iced storage for delivery to the environmental <br /> laboratory The effluent sample El was collected using the same pump, however, the vapors were <br /> drawn from the exhaust stack of the IC engine through a coiled copper line (for cooling purposes) <br /> into the tedlar bag This sample was labeled and placed in iced storage for immediate delivery to the <br /> laboratory All of the vapor samples were listed on a chain of custody and submitted to the <br /> laboratory with the mandatory custody record (Appendix E) <br /> 5 5 2 Laboratory Analyses and Results <br /> Laboratory analyses were conducted prior to the maximum 72 hour holding time for vapor samples <br /> The samples were analyzed for TPHg using EPA method 5030 purge and trap, and for BTEX <br /> compounds using EPA method 602 Laboratory results of influent vapor samples indicated that a <br /> significant concentration of TPHg in vapor was removed from the subsurface through the point of <br /> extraction (Table 9) Concentrations of TPHg detected in the vapor samples collected at the site <br /> indicated that the recovery rate of hydrocarbons was consistent over the duration of the pilot test <br /> A total of 2 2 pounds of hydrocarbon (TPHg) were recovered during the pilot test at an averaged <br /> daily rate of 13 67 pounds per day Laboratory results of the effluent vapor sample (A-0310-E1) <br /> collected from the exhaust of the IC engine indicated that less than 0 36 pounds of hydrocarbon <br /> (TPHg) off-gas was emitted during the pilot test <br /> SEACOR 014-01-1 par 17 <br />