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APPENDIX 8 SITE CLOSURE EVALUATION REPORT <br /> Beacon Station No.696 <br /> 2448 West Kettleman Lane <br /> Lodi,California <br /> ' Delta Project No.D093-916 <br /> Page 5 <br /> The approximate extent of petroleum hydrocarbons in ground water as of January 1988 is illustrated in Figure 11. No <br /> ' ground water samples collected from monitoring wells MW-20, MW-34, MW-35, and MW-36 after October 1992 <br /> have contained detectable concentrations of petroleum hydrocarbons. Concentrations of petroleum hydrocarbons in <br /> ' ground water samples collected from monitoring wells MW-24 and MW-25 since March 1992 have typically been <br /> below or slightly above the limits of detection. None of the ground water samples collected during the most recent <br /> ' sampling event in June 1996 contained detectable concentrations of petroleum hydrocarbons. <br /> t4.0 SITE REMEDIATION <br /> Petroleum hydrocarbons have been removed from the subsurface by pumping and treating of ground water, SVE, and <br /> ' excavation. A ground water pump and treat system began operating at the site in January 1986, and was in operation <br /> until approximately late 1988. Records of the operation of the pump and treat system and estimates of the volume of <br /> ' hydrocarbons removed are not available. <br /> A SVE system was operated at the site from December 1989 until April 1994. The SVE system utilized a catalytic <br /> oxidizer for hydrocarbon destruction through September 1992, at which time the system was converted to activated <br /> ' granular carbon adsorption. During the operation of the SVE system, it is estimated that approximately 1,600 gallons <br /> of gasoline hydrocarbons were removed from the subsurface. <br /> ' 5.0 ASSESSMENT OF REMEDIATION-EFFECTIVENESS <br /> ' Active remediation at the site included operation of a SVE and ground water treatment system. The ground water <br /> treatment system operated at the site during the period of January 1986 through late 1988. Records of the amount of <br /> ' petroleum hydrocarbons removed from ground water are not available to Delta; however, ground water analytical <br /> results indicate petroleum hydrocarbon concentrations decreased during operation of the ground water treatment <br /> system and subsequently continued to decrease to non-detectable concentrations. The SVE treatment system operated <br /> at the site from December 1989 through April 1994. During this period approximately 1,600 gallons of gasoline were <br /> removed from the underlying soil matrix. <br /> r <br /> i <br /> ' RPT001.916 <br />