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. QuarterIy Summary Report <br /> Fourth Quarter 1996 <br /> Former Unocal Service Station 2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> County STID # None <br /> County San Joaquin <br /> BACKGROUND <br /> Underground storage tanks removed in March 1988 From March 1985 through <br /> November 1994, a total of 12 on-site and 3 off-site borings were drilled, 4 on-sate moni- <br /> toring wells, 3 on-site soil vapor extraction (SVE) wells, and 5 off-site monitoring wells <br /> were installed Analytical results indicate that soil near the eastern dispenser island <br /> contains gasoline hydrocarbons and groundwater has been impacted with gasoline <br /> hydrocarbons A work plan to Frutiate a 6-month SVE test was subnutted on July 14, <br /> 1995 A 30-day public notification for air permitting was imtiated, and an air perirut to <br /> construct was received in December The SVE remedial system was constructed in <br /> January 1996 <br /> RECENT QUARTER ACTIVITIES <br /> Quarterly groundwater morutonng and sampling were performed in November 1996 The <br /> SVE pilot test was completed and the system was shut down in November Results of the <br /> pilot test indicate that SVE has been successful at removing nearly 2,800 pounds of <br /> hydrocarbons However, analysts of the mass removal trend also indicated that the <br /> incremental benefit of continued operation has been lost The system appears to have <br /> reached a relatively asymptotic state with regard to mass removal versus hours <br /> operational <br /> NEXT QUARTER ACTIVITIES <br /> Fust quarter 1997 groundwater momtonng and samphng will be performed Unocal will <br /> provide a response to recent correspondence from San Joaquin County Public Health <br /> Services <br /> 3100405A/4Q96QSR 1 January 17, 1997 <br />