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Creolagical Tedmda Inc Dual Phase Extraction Pilot Test Report Page 5 Project No.723.2 ~^' November 5,2004 vacuum radius of influence and then progressed to other well configurations as discussed in detail below. +— Soil vapor samples were periodically collected and submitted to Air Toxics Ltd. of Folsom, California (State Certified Laboratory #102110) for the following analysis by EPA Method TO-3: Benzene, toluene, ethylbenzene and xylene (BTEX) + Methyl tertiary butyl ether(MTBE) Gasoline range petroleum hydrocarbons (TPH-Gas) A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity. The soil vapor laboratory data are included in Appendix C and summarized in Table 1, Appendix A. M. Groundwater samples were also periodically taken and submitted to Sherwood Labs of Hilmar, California(certification #1400) for analyses of: u Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX), MTBE, by EPA method 8020. ❑ Total Petroleum Hydrocarbons as Gasoline (TPH-G)by EPA method 5030/8015(M). The groundwater laboratory data are included in Appendix C and summarized in Table 2, .-� Appendix A. 3.1 Vapor Extraction from Well EW-1 GTI staff installed a stinger in well EW-1 at a depth of approximately three feet bgs: and vacuum applied on July 26, 2004 at 9:25 (Monday). Vacuum measurements were made in the surrounding wells using magnehelic gauges provided by Mako at 15 minute intervals to start. Air velocity, organic vapor and treatment system vacuum were also monitored. Each wells' vacuum was measured by placing a cap over the well and attaching a gauge to the cap's orifice. The field measurements conducted by GTI staff are included in Table 3, Appendix A. Lm After one hour of operation the vacuum influence measured in wells VEW-1, VEW-2 and MW-5 exhibited asymptotic conditions (see Figure 3). The system was configured to continue extracting vapor only from EW-1 overnight and three separate vapor samples were obtained from EW-1 during this start up period for Iaboratory analysis. LN On the evening of July 26a', GTI staff placed Solinst Leveloggers in five monitoring wells to record groundwater elevation changes during the remainder of the tests. Wells MW-1, MW- 2, MW-4, MW-5 and MW-6 were monitored, but well MW-3 was inaccessible during the test (disabled car parked over the well). V