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S E C 0 R <br /> Circle K Store 08671 <br /> August 31, 2005 <br /> Page 5 <br /> SVE Summary <br /> SVE was performed using a 10 horsepower (hp), 250 standard cubic feet per minute <br /> (scfm), positive displacement vacuum pump connected to a thermal oxidizer (therm-ox) <br /> used as the soil vapor abatement device <br /> SECOR performed the SVE test at the site from May 10 to May 13, 2005 The test began <br /> at 9 13 a m on May 10, 2005 and extracted from well SVE-1 for approximately 17 2 hours <br /> and from well SVE-2 for approximately 8 3 hours The test ended on May 13, 2005 at 1 30 <br /> pm <br /> Physical and chemical parameters including applied vacuum, soil vapor extraction flow <br /> rates, soil vapor temperature, and Volatile Organic Compound (VOC) concentration <br /> measurements were monitored throughout the SVE event VOC concentrations were <br /> measured using a Flame Ionization Detector (FID) A vacuum gauge was placed at nearby <br /> monitoring wells in order to monitor the negative pressure gradient induced by SVE at the <br /> extraction wells SVE test system data is presented as Table 4, observation well data is <br /> included as Table 5, and soil vapor analytical, removal, and emission data is presented as <br /> Table 6 Field data sheets are included as Attachment 4 <br /> SVE RESULTS <br /> o The applied vacuum ranged from 8 5 inches of mercury (in Hg) to 17 0 in Hg while <br /> extracting from well SVE-1 The applied vacuum ranged from 9 5 in Hg to 11 0 in Hg <br /> while extracting from well SVE-2 <br /> • Vapor extraction flow rates ranged from 17 scfm to 32 scfm while extracting from well <br /> SVE-1 and 22 scfm to 26 scfm while extracting from well SVE-2 <br /> No induced vacuum was measured in any well while extracting from well SVE-1 <br /> Induced vacuum was measured in MW-4S (located 9 feet north of SVE-2) from 0 9 <br /> inches of water (in H2O) to 1 8 in H2O <br /> LABORATORY ANALYTICAL RESULTS <br /> Influent vapor samples were collected through a sampling port located on the manifold <br /> prior to the dilution valve An effluent sample was collected at the top of the therm-ox <br /> stack The air samples were sent under chain-of-custody documentation to a California <br /> State-certified analytical lab (Severn Trent Laboratories), and analyzed for total TPHg, <br /> BTEX compounds, and MtBE Vapor analytical results are presented in Table 6 Certified <br /> laboratory analytical reports and chain-of-custody documentation are included in <br /> Attachment 4 <br /> The effluent air sample did not contain any detectable concentrations of TPHg, BTEX <br /> . compounds, or MtBE above the laboratory reporting limits Influent vapor samples were <br />