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IIx B SITE CLOSURF,�V�,],UATiON REPORT <br /> Beacon Station No.696 <br /> 2448 West Kettleman Lane <br /> Lodi,California <br /> Delta Project No.D093-916 <br /> Page 7 <br /> calculations estimating the mass of petroleum hydrocarbon impacted ground water prior to vapor extraction are <br /> ' included in Appendix E. Records of the operation of the pump and treatment system and estimate of the volume of <br /> hydrocarbons removed are not available. Figure 11 was used in the calculation estimating the mass of petroleum <br /> ' hydrocarbons in ground water prior to vapor extraction. An estimate prior to ground water pumping could not be <br /> made, since ground water removal data was not available. <br /> Based on the second quarter 1996 ground water monitoring event, no petroleum hydrocarbons were reported <br /> ' remaining in ground water underlying the site. <br /> 6,0 SSUMMARYICONCLUTONS <br /> ' Soil and ground water assessment and remediation at the site began in February 1985. Active remediation began in <br /> January 1986 by a ground water pump and treatment system and continued until late 1988. Records of the operation <br /> of the pump and treatment system and estimate of the volume of hydrocarbons removed are not available. Source <br /> removal continued with the installation of a SVE system in December 1989 which operated until April 1994. The <br /> ' SVE was turned off due to inefficient operating conditions related to decreased influent petroleum hydrocarbon <br /> concentrations. As of April 1994 the SVE system removed approximately 1,600 gallons of vapor equivalent gasoline. <br /> ' The results ofremedial activities. ct ties conducted at the site to date are illustrated by comparison of Figure 11, which is an <br /> ' estimated size of the hydrocarbon plume in ground water for the sampling event conducted in January 1988, with the <br /> fact that in the last four quarters no petroleum hydrocarbons have been detected in any well that had sufficient water <br /> to collect a sample. Additionally, mass balance calculations estimate that only 0.11 gallons of benzene remain in soil <br /> which is a 99 percent reduction in benzene. <br /> ' RPTp01.916 <br />