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4#01e9=1TCChJLI IAC- Page 9 Dual Phase Extraction Pilot Test Report Project No 652 2 February 22,2005 reduced to 5 gpm During the scheduled system check at midnight, the holding tank looked in danger of overfilling so the extraction rate was reduced to 3 gpm for the remainder of the ' night December 8 ' On December 8th (Wednesday) at 8 00 American Valley picked up their second load of 3300 gallons and returned at 13 00 to pick up another load of 3300 gallons The system was set at an extraction rate of approximately 10 gpm and left at this setting American Valley then ' made at least three transports per day for the remainder of the test December 9 Water and soil vapor samples were taken at 8 hour intervals throughout the test (5.00, 16 00, and at midnight) One system shut down occurred on December 9th (Thursday) for unknown reasons The system was found off at the 16 00 check and re-started without problems It is ' theorized that a "deadhead" occurred in one or both of the stingers that led to a high pressure shut down ' 4.4 Extraction Termination December 10 On December 10th (Friday), at 15 00 the process of terminating the test was initiated The Solinst Leveloggers® were removed from the wells and final depth to water measurements ' taken in the wells A final set of vacuum measurements were taken and then the monitoring wells were closed and secured The system was turned off and the stingers removed from the two extraction wells A final water load was picked up by American Valley at 16 00 and ' Mako staff arrived at 16 45 to ready their trailer for transport The groundwater extracted during the five day test totaled approximately 32,250 gallons A detailed analysis of the extraction data is presented in the following sections 5.0 DATA ANALYSIS ' In the following sections GTI will discuss data generated by the test that can be used to design a vapor extraction and/or groundwater treatment system for full site remediation r 5.1 Vapor Extraction GTI monitored the soil vapor extraction process by periodically measuring vacuum pressure in wells MW-1, MW-2 and MW-3 The field measurement data have been converted to ' inches of water vacuum for convenience and are included in Table 6 (inches water vacuum = inches Hg x 13 6) Wells MW-1, MW-2 and MW-3 are located approximately 35, 58 and 14 feet, respectively from EW-2 As stated above, the extraction from EW-2 started on