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Multi-Phase Extraction Pilot Test Report&Remedial Design i Thrifty Station No 171 Page 2 Stockton,California November 3D,2614 A portable VOC meter was used to measure undifferentiated hydrocarbon concentrations of extracted vapor in the field. VOC readings were taken and recorded from influent and effluent vapor streams using designated, inline sample ports. Note the calculation to determine the contaminant mass removal is a function of influent vapor concentration and air flow, and is calculated as follows: 1C min ftj 86 lbs/lb mol test hrs. x -- x 60 ----- x ----- x = lbs 106 hr min 379 fe/lb mol Where IC=influent concentration,analytical results of TPAg averaged between test beginning and end samples in parts per million(ppm) During the first 24 hours multi-phase extraction was performed from only well EW-5S.An electric downhole pump was Iowered into the well with discharge tubing, the pump inlet was set approximately two to three feet from the bottom of the well, and a flexible hose was inserted through a sealed cap in the top of the well for vapor extraction. System operational parameters were measured and recorded every hour. Groundwater monitoring data, including vacuum response and depth to water, was collected from wells EW-5D, T13-7, TB-IIV, TB-11 W, and VW-5 and recorded hourly. Influent vapor samples were collected after one hour of extraction, and again after 24 hours of extraction, prior to changing extraction wells. Laboratory analytical data of vapor samples in included as Table 5. During the second 24 hour period multi-phase extraction was performed at only well EW-SD. System operational data and monitoring well data was collected from wells EW-5S,TB-7,TB-11 V, TB-11 W,and VW-5 and recorded hourly. Influent vapor samples were collected after one hour of extraction,and again after 24 hours of extraction. During the third 24 hour period multi-phase extraction was performed from well TB-7. System operational data and monitoring well data was collected from wells EW-5S, EW-51), TB-11V, TB-11W, TB-12V, TB-12W, and VW-5 and recorded hourly. Influent vapor samples were collected after one hour of extraction, and again after 24 hours of extraction. For the final 48 hours of the test, multi-phase extraction was performed from three wells simultaneously, EW-5S, EW-51), and TB-7. System operational data and monitoring well data was collected and recorded from wells TB-6, TB-9V, TB-9W, TB-11V, TB-11W, TB-12V, TB-12W, and VW-5 after beginning multi-phase extraction from three wells, after three hours of environ strategy consultants, inc.�