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(Contaminant monitoring might consist of sampling and field screening Wath a photoaonazataon detector,flame ionization detector,field gas chromatograph, or detector tubes or might involve sampling for laboratory analysis Refer to the Environmental Monitoring checklist) d) Are measurements made with adequate frequency(say every 3-12 months in a single round) to determine if capture or air throughput are affected by changes in extraction rate, soil moisture content, or groundwater levels? Are measurements made on a seasonal basis if seasonal fluctuations in parameters such as soil moisture content or water table level are expected9 e) Are flows, vacuum levels, and concentrations measured in each extraction well? Are these parameters monitored with the same frequency as at the monitoring points? f) Have air permeability tests been conducted on the extraction wells and air conductivity values calculated for those locations? g) Have tracer tests been conducted to verify air flow paths and adequate travel times/velocities? (Normally done only where the site complexatyjustifies its use or where unusual vacuum/contaminant response to extraction as observed) h) Has there been unexpected contamination found outside the capture zone or any indication of an unknown source? i) Are measurements of water table fluctuations made to determine the possible effects on the SVE system's performance? j) Record the nameplate information from the vacuum blower, pumps, and other mechanical equipment for future reference k) Sketch a process flow diagram (PFD), including valves and instrument locations, on the back of this sheet or on a separate sheet 1) If modeling was performed, obtain a copy of the original SVE modeling done as part of the system design (The design modeling may be useful an evaluating the operation of the system) 06/07/99 Page 3 of 8