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w <br /> The test began at 0930 and continued until 1245 when it was obvious that <br /> the subsurface soil was not permeable enough to support the use of VE <br /> technology. <br /> Test data is included in : Appendix K. The following conditions were <br /> achieved during the test. <br /> + Th'e vacuum imposed on extraction well VE-1 ranged from 30 inches of <br /> E <br /> water at the beginning of the test to a high of 76 inches of water near <br /> the end of the test. <br /> r <br /> • The airflow coming from VE-1 was immeasurable during the entire <br /> length of the test, allowing only approximately 1 to 2 cubic feet p e r <br /> minute (cfm) of air from VE-1. Dilution air was used to support <br /> combustion of the ICE. When the dilution air valve was closed, the <br /> vacuum on VE-1 increased, but the airflow from VE-1 never increased. <br /> • The ICE's rpm was increased in an attempt to allow airflow to b e <br /> removed from VE-1; however, the airflow never increased - from VE-1. <br /> `- Increasing the vacuum only caused the system's knock-out drum to <br /> collapse slightly. <br /> + The influence of the extraction well was measured on the surrounding <br /> observation wells during the test. None of the wells showed a <br /> significant increase of negative pressure, due to the inability to remove <br /> air from the extraction well because of low-permeable soils. Some of <br /> the wells actually showed a positive pressure at times during the test. <br /> Only observation well VE-2, a vapor-extraction well screened only in <br /> the vadose zone, showed a measurable increase in negative pressure. <br /> + Vapor samples were collected from the influent vapor stream in Tedlar <br /> bags at 0945 and 1230. These samples were analyzed for TPH-G. BTEX <br /> and MTBE by EPA Method 8260 by STL Chromalab, Inc. of Pleasanton, <br /> California (FLAP #1094). Analytical results are tabulated as Table Five, <br /> and the certified analytical report is attached in Appendix L. <br /> The data gathered during the vapor-extraction test proved that the <br /> technology of vapor extraction would not be a useful tool to capture a <br /> sizeable radius of impacted vadose zone Hydrocarbons. <br /> 574 West Grant Line Road CAP — January 2002 <br /> -15- <br />