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Citatgkal Tec/uclrs INC- Page 7 <br /> Dual Phase Extraction Pilot Test Report <br /> Project No 662 2 <br /> February 22,2005 <br /> ' ■ The captured contaminated groundwater was transferred to a storage tank via a high <br /> vacuum pump The storage tank was emptied periodically by a licensed hauler <br /> ' (American Valley) for transportation to a waste disposal facility <br /> Pre-test depth to water measurements were conducted on the morning of December 6, 2004 <br /> and Sohnst Leveloggers® were placed in several wells to record groundwater levels The test <br /> was then started with vapor extraction only from well EW-2 to determine vacuum radius of <br /> influence and then progressed to other well configurations as discussed in detail below <br /> ' Soil vapor samples were periodically collected (8 hour intervals) and submitted to Air Toxics <br /> ' Ltd of Folsom, California (State Certified Laboratory##02110) for the following analysis by <br /> EPA Method TO-3 <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) <br /> ' • Methyl tertiary butyl ether (MTBE) <br /> • Gasoline range petroleum hydrocarbons (TPH-Gas) <br /> ' A Chain of Custody was completed for all samples collected and tracked to ensure sample <br /> integrity The soil vapor laboratory data are included in Appendix C and summanzed in <br /> Table 3, Appendix A <br /> Groundwater samples were also periodically taken (8 hour intervals) and submitted to <br /> Sequoia Analytical of Sacramento, California (State Certified Laboratory #1624) for the <br /> ' following analyses <br /> ❑ Benzene, Toluene, Ethylbenzene and Xylene (BTEX) by EPA method 8260 <br /> ❑ Gasoline range petroleum hydrocarbons (TPH-G)by EPA method 8260 <br /> ❑ MTEB, ETBE,DIPE, TAME & TBA by EPA method 8260 <br /> ❑ Ethanol, 1,2 DCA, EBD by EPA method 8260 <br /> ❑ Methanol by EPA method 8015B modified <br /> ❑ Diesel by EPA method 8015B <br /> ❑ Lead by EPA Method 6010B (1 sample) <br /> The groundwater laboratory data are included in Appendix C and summarized in Table 4, <br /> Appendix A <br /> ' As required under AB2886, GTI submitted the laboratory data in accordance with <br /> GeoTracker requirements on February 14 and 15, 2005 (confirmation #8070687055, <br /> ' 2807940840 & 3016972899) <br /> 4.1 Vapor Extraction from Well EW-2 <br /> ' December 6 <br /> GTI staff installed a stinger in well EW-2 at a depth of approximately three feet bgs and <br /> vacuum applied on December 6, 2004 at 09 40 (Monday morning) Vacuum and flow rate <br /> 1 <br />