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f <br /> Vapor Extraction Test Report <br /> Former Thrifty Oil Service Station # 172 <br /> September 14, 1995 <br /> 1.0- INTRODUCTION <br /> This report presents the results of soil vapor extraction (SVE) testing activities performed at <br /> Thrifty Service Station#172, located at 7647 Pacific Avenue in Stockton, California. (Figure 1). <br /> The vapor extraction testing activities were conducted to: <br /> • Assess the feasibility of using vapor extraction to mitigate hydrocarbon-affected soil <br /> beneath the site; <br /> Estimate air extraction rates; <br /> • Calculate the approximate vacuum radius-of-influence; and <br /> • Collect and analyze influent air samples from each extraction well <br /> In addition, test results may be used to: <br /> • Fstzmate hydrocarbon removal rates <br /> • Design an extradtion well field array; <br /> • Select the type of treatment technology; <br /> Estimate the flow rate capacity required for a vapor extraction system. <br /> Appendix A includes definitions of terms and abbreviations used in this report. <br /> 2.0 VAPOR EXTRACTION TEST ACTIVTITES <br /> 1 Threer extraction tests were <br /> � performed at this site as outlined in Appendix B. Each test <br /> array consisted of extracting vapors from one well (the test well) while observing vacuum <br /> responses in other wells (the observation wells). The test conditions were as follows: <br /> 1 2 3 <br /> TEST DATE 6/26/95 6/26195 6/26/95 <br /> Tyr VVIELL VW-A VW-B VW-C <br /> wEL L SCREEN (fbg) 5-35 5-8 10-45 _ <br /> TEST TYPE Constant Flow Constant Flow Constant Flow <br /> DURATION (mug) 60 60 60 <br /> VW B, VW_C, VW-A, VW-C, VW-A. VW-B,. <br /> OBSERVATION WELLS MW-1, MW-3, MW-1. MW-3, MW-1, MW-3, <br /> MW-4, MW_8 MW-4, MW-8 MW-4, MW-8 <br /> DISTANCES TO 26 to 90 16 to 97 27 to 67 <br /> OBSERVATION WELLS (ft) <br />