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GraloguaI Tecknus I= Page 10 Dual Phase Extraction Pilot Test Report Project No 662 2 February 22,2005 1 December 6b at 09 40 and the initial extraction was approximately 299 inches of water vacuum (22 inches Hg x 13 6=299 2) ' The vacuum influence did extend to the locations of the monitoring points as indicated by the data in Table 6 The vacuum measured in MW-1 started at 163 inches and eventually rose to ' 6 12 inches after -22 hours Similarly, the vacuum influence measured in MW-2 started at 0 27 inches and rose to 0 82, but MW-3 started at 6 80 inches of vacuum and fell to 4 08 inches by the time 22 hours had elapsed ' The vapor extraction rate from EW-2 started at 108 cubic feet per minute (cfm) As the vacuum influence spread through preferential pathways in the subsurface the rate would be ' expected to increase but it decreased to 79 cfm after -22 hours had elapsed It is noted that significant rain fall was present on December 6 & 7 at the start of the test and this may account for less influence as the soils became saturated The decrease in flow coincided with ' an increase in inches of Mercury(Hg) vacuum 5.2 Groundwater Extraction The dual phase extraction equipment removed soil vapor and groundwater together through the same stinger hose In this fashion the water could not be metered to measure the extraction rate The extracted water was contained in a tank on the treatment trailer until the tank's upper limit switch was activated by the rising water level Upon activation, a pump ' would transfer the water through a meter and into the 5,200 gallon tank trailer supplied by American Valley GTI staff monitored the transfer meter and used the data to determine pumping rates by dividing the gallons pumped by the elapsed time Table 5 in Appendix A ' contains the groundwater pumping rate data In addition, GTI performed field estimates of pumping rates utilizing a calibrated tube on the trailer's holding tank The volume between two calibration marks was divided by the time required to fill the tube between the marks to ' produce the pumping rate These data are included to Table 5 in the "field gpm" column Note The amount of water extracted listed in Table 5 is 29,009 gallons based on the treatment system trailer's meter The meter is suspect because the amount transported off site by American Valley totaled 32,250 gallons based on the truck(s) gauges This latter amount was confirmed utilizing a meter on the railroad tank car into which the water was ' pumped by American Valley ' Solinst Leveloggers®Problems GTI intended to prepare time draw down graphs to document response to groundwater extraction But several problems were encountered in using the Solinst Leveloggers® (Leveloggers) to record depth to groundwater in the wells A Solinst Barologger® was suspended in well MW--2 to measure barometric pressure during the test period The data from this unit was to be used to compensate the Leveloggers to remove the effect of ' barometric pressure fluctuations due to weather changes The Barologger® failed to operate 1