ARCHIVED REPORTS_XR0008002 - Laserfiche WebLink

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. quarterly The manifold piping system and SVE wellhead configurations are not set up to measure vacuum in individual wells f Have air permeability tests been conducted on the extraction wells and air conductivity values calculated for those locations? This has not been completed g Have tracer tests been conducted to verify air flow paths and adequate travel times/velocities? (Normally done only where the site complexity justifies its use or where unusual vacuum/contaminant response to extraction is observed) This has not been completed h Has there been unexpected contamination found outside the capture zone or any indication of an unknown substance Groundwater contamination in the vicinity of groundwater monitoring wells MW-3 and MW-11 appears to be outside of the capture zone for SVE system i Are measurements of water table fluctuations made to determine the possible effects on the SVE system's performance? Yes Quarterly depth to groundwater measurements are collected from all groundwater wells The well screens for the SVE wells were installed at or above historical high groundwater elevations The well screens for SVE wells MW-23S, MW-25S, and MW-25D were submerged during ENSR's 4th Quarter 2004 vapor sampling event j Record the nameplate information from the vacuum blower, pumps, and other mechanical equipment for future reference Blower is a Sutorbilt model regenerative blower capable of 300-cubic feet per minute (cfm) The model numbers for the pumps and other mechanical equipment have not been recorded k Sketch a process flow diagram (PFD), including valves and instrument locations, on the back of this sheet or on a separate sheet See Attached I If modeling was performed, obtain a copy of the original SVE modeling done as part of the system design ENSR did not find any records to indicate that design modeling had been performed a part of the system design 5 Performance Analysis Calculations a Prepare flow rate versus time graphs for each extraction well Are the vapor extraction rates the same as those in the design specifications? Have the vapor extraction rates changed since the initial period of operation? Vapor flow rates for individual extraction wells does not exist since individual flprA, rate r nta fnr Pxtrartinn wpik rannnt ha arri rately mPaSured The design of the manifold piping system limits accurate measurement of individual flow rates in extraction wells when all wells are drawing vapor b Construct vacuum isopleth maps of the site Is the vacuum distribution consistent with that predicted during design? Does the vacuum distribution (in three dimensions) indicate captures of vapors and prevention of migration to receptors? ENSR has not constructed a vacuum Ol isopleth map for the extraction wells since individual flow rate data for extraction