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Monitoring Well Installation and VET Report,and[RAP—Former Unocal Station#0187, Stockton,CA December 22 2000 Pilot Test Procedure The VE pilot test was conducted from November 27 to December 1, 2000, and consisted of extraction from three wells at different times The VE system was connected to wells UV-1, UV-2 and UV-3 Vacuum observations were collected on vapor extraction wells UV-1, UV-2 and UV-3, and groundwater piezometer NP-1-22 The IC engine was set to operate at a constant motor speed (RPM) during the test The applied vacuum to the extraction wells was varied automatically by the engine, based on influent petroleum concentrations The RPM was also manually stepped up during the course of the test each day This also varied the applied vacuum Propane was used as a secondary fuel source for the engine when extracted petroleum concentrations were not high enough to act as the sole fuel source Laboratory influent and effluent air samples were collected near the beginning, middle and end of the test each day Analytical data are summarized in Table 4 The VE test monitoring data are summarized in Table 3 On November 27 and 30 and December 1 soil vapors were extracted from well UV-1 This well is slotted from 15 to 45 feet bgs On November 28 soil vapors were extracted from well UV-2 This well is slotted from 15 to 25 feet bgs On November 29 soil vapors were extracted from well UV-3 This well is slotted . from 15 to 25 feet bgs Piezometer NP-1-22 is-slotted from 22 to 37 feet bgs The test ran for approximately 8 hours each day The groundwater level at the time of the test was approximately 26 feet bgs Pilot Test Results On November 27 and 30 and December 1 soil vapors were extracted from well UV-1 System flow rates from UV-1 ranged from 9 to 23 standard cubic feet per minute(scfrn) The applied vacuum ranged between 9 and 17 inches of water column (inches) The highest vacuum level recorded in any of the observation wells during the test was 0 12 inches of water column (inches) in well UV-2 No measurable vacuum was observed in wells L1V-1 and NP-1-22 Test results were fairly consistent over the three days of the test on this well On November 28 soil vapors were extracted from well LTV-2 System flow rates from W-2 ranged from 9 to 12 scfm The applied vacuum ranged between 9 and 12 inches The highest vacuum level recorded in any of the observation wells during the test was 0 02 Inches in wells LTV-1 and NP-1-22 No measurable vacuum was observed in well LTV-3 On November 29 soil vapors were extracted from well UV-3 System flow rates from LJV-3 ranged from 11 to 13 scf n The applied vacuum ranged between 6 and 10 inches The highest vacuum level recorded in any of the observation wells during the test was 0 06 inches in well UV-1 This data suggests a very limited lateral radius of influence No significant level of vacuum (greater than 0 2 inch)was recorded in any of the observation wells during the test The shortest distance between a test well and an observation well was approximately 15 feet, between wells UV-2 and NP-1-22 The greatest vacuum recorded on an observation well was 0 12 inches in well UV-3 with the vacuum applied to UV-1 24004208-1 8