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UR Levine-Free Revised extraction well This equipinent will be Installed inside the extraction well vault The Pitot tube measures a pressure differential between a small-diameter tube pointed into the vapor stream within the conveyance pipe and the ambient pressure The pressure differential between the two points, the diameter of the pipe, and the temperature of the vapor are used to calculate the now rate for the vapor stream Flow rates will also be monitored at upstream and downstream sides of the dilution valve on the suction sidle of the blower using a rotameter to document the total system flow Temperature gauges will also be located in the conveyance piping near each Pitot tube to measure temperatures of the extracted vapor 5.4.3.3 Field Monitoring Samples Screening level samples will be collected from the soil vapor monitoring wells before, during, and after each Phase I SVE test sequence. Samples will be collected in 1-liter Tedlar bags for total VOC monitoring with a field photmonization detector (PID) with an 11 4 eV lamp_ Samples will be collected using a vacuum pump connected to a vacuum chamber housing the Tedlar bag The Tedlar bag will be connected to the SVE well sampling port using inert Teflon tubing that passes through the wall of the vacuum chamber. To retrieve a vapor sample under vacuum, and overcome the vacuum in the extraction well or monitoring well, a small vacuum pump will be connected to the chamber and a vacuum developed_ When the vacuum in the chamber exceeds the vacuum in the well, soil vapor will flaw from the well into the Tedlar bag contained in • the chamber Once filled, the Tedlar bag will be connected to a calibrated PID and a total VOC measurement will be made Oxygen and carbon dioxide concentrations will be measured in samples collected from the momtonng wells before, during, after each Please I testing sequence using a Gastec meter(Table 0_ The Purpose of oxygen-carbon dioxide monitoring will be to record the degree of flushing of the unsaturated zone that may result from the movement of fresh air into the subsurface during SVE. 5.4.3.4 Soil-Vapor,Laboratory Sample Collection Vapor samples will be collected for laboratory analysis at the monitoring wells The frequency used will be deterrmned by the Phase I test sequence being performed, as presented in Table 1. Samples will be collected in Tedlar bags following the methodologies identified in Section 5 4 3 3 Samples will be analyzed for VOCs using either a PID Or using Environmental Protection Agency (EPA) Method TO-14 by a California static-certified analytical laboratory 5.5 Phase I Data Analysis Data collected during the Phase I SVE pilot WStlinvestigations will be evaluated and used to assess the applicability, effectiveness, and cost parameters to develop the • �e is WPSVECwS-LaM-r"_MI 3 dw Lfr 0;'-i60 d ecT0v9b60zT 01 905b zS9 OTS BAOIa3 3NM31 dd7 d3 0S 9T zO, 60 inf