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<br /> A S S O C I A T E S I N C
<br /> 3.0 VAPOR EXTRACTION PILOT TEST
<br /> A vapor extraction pilot test was proposed in ATC's Workplan for Vapor Extraction Pilot Testing
<br /> at Former Greer Property, 15634 Steinegul Road, Escalon, California, dated June 18, 2003
<br /> The purpose of this test was to evaluate vapor extraction as a viable remedial option for impacted
<br /> soil and groundwater at the site and to collect data to design a vapor extraction system
<br /> 3_I Vapor Extraction Test Methods and Procedures
<br /> On September 18 and 29, 2003, ATC performed a short-term vapor extraction test and a long-
<br /> term vapor extraction test, respectively On the first day, a short-term vapor extraction test was
<br /> performed by ATC using vapor well VE2 as the vapor extraction point while monitoring vacuum
<br /> response in surrounding wells VE1, VE3, MW1, MW2, MW3, MW4, MW5, MW6, MW8, and
<br /> MW9 (Figure 2) The test was approximately 3 hours and 45 minutes in length Flowrates,
<br /> applied vacuums, influent and effluent VOC concentrations, and temperatures were also
<br /> monitored during the test Vapors were extracted using 3 HP Rotron Blower equipped with a
<br /> ' moisture knockout chamber and three granular activated carbon (GAC) canisters Two influent
<br /> vapor samples were collected during the test, one after 15 minutes of operation, and one after 3
<br /> hours and 45 minutes of operation An effluent vapor sample was collected after 15 minutes of
<br /> operation All vapor samples were collected into vacuum canisters Samples were submitted
<br /> under chain-of-custody to SunStar Laboratories (FLAP #2250) and analyzed for TPHg, BTEX,
<br /> MTBE, 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), ethyl tert-butly ether (ETBE),
<br /> dl-isopropyl ether (DIPE), tert-butly alcohol (TBA), and tert-amyl methyl ether (TAME) by EPA
<br /> Method TO-14
<br /> On the second day, a long-term vapor extraction test was performed by ATC using vapor well
<br /> VE3 as the vapor extraction point while monitoring vacuum response in surrounding wells VE I,
<br /> VE2, MW1, MW2, MW3, MW4, MW5, MW6, MW8, and MW9 (Figure 2) The test was
<br /> approximately 5 hours in length Flowrates, applied vacuums, influent and effluent VOC
<br /> concentrations, and temperatures were also monitored during the test Vapors were extracted
<br />' using an 3 HP Rotron Blower equipped with a moisture knockout chamber and three granular
<br /> activated carbon (GAC) canisters Two influent vapor samples were collected during the test,
<br /> one after 15 minutes of operation, and one after 5 hours of operation An effluent vapor sample
<br /> was collected after 20 minutes of operation Samples were submitted under chain-of-custody to
<br /> SunStar Laboratories (ELAP #2250) and analyzed for TPHg, BTEX, and MTBE, 1,2-DCA,
<br /> EDB, ETBE, DIPE, TBA, and TAME by EPA Method TO-14
<br /> 3_2 Vapor Extraction Test Results
<br /> Results and field readings from the short-term and long-term vapor extraction tests performed on
<br /> September 18 and 29, 2003 are summarized in Tables 4 and 5, respectively Copies of field
<br /> notes are contained in Appendix A Copies of laboratory reports are contained in Appendix B
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