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Quarterly Summary Report <br /> ' Third Quarter 1996 <br /> Former Unocal Service Station 2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> County STID 9 None <br /> County San Joaquin <br /> BACKGROUND <br /> Underground storage tanks removed in March 1988 From March 1988 through <br /> November 1994, a total of 12 on-site and 3 off-site borings were drilled, 4 on-site moni- <br /> tormg 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 initiate a 6-month SVE test was submitted on July 14, <br /> 1995 A-30-day public notification for air permitting was initiated, and an air permit to <br /> construct was received in December The SVE remedial system was constructed in <br /> January 1996 <br /> • RECENT QUARTER ACTIVITIES <br /> Quarterly groundwater monitoring and sampling were performed in August 1996 A <br /> summary report documenting SVE system performance in the second quarter 1996 was <br /> submitted Operation and maintanence of the remedial system continued <br /> NEXT QUARTER ACTIVITIES <br /> Fourth quarter 1996 groundwater monitoring and sampling will be performed m <br /> November Operation and maintenance of the SVE system will continue Unocal w111 <br /> evaluate the effectiveness of the SVE remedial system to determine a long-term site <br /> strategy <br /> CHARACTERIZATION/REMEDLA,L STATUS <br /> Soil contamination delineated? Yes <br /> Dissolved groundwater delineated? Yes <br /> Separate-phase hydrocarbons delineated? Not applicable <br /> Amount of hydrocarbon contaminant recovered to crate? Approximately 1.325 lbs <br /> Soil remediation in progress's Yes <br /> Start date? January 1996 <br /> Anticipated completion date? August 1996 <br /> Dissolved/Separate-phase hydrocarbons remediation in progress? No <br /> Anticipated start? Not applicable <br /> Anticipated completion? Not applicable <br /> CONSULTANT Pacific Environmental Group, Inc <br /> 3100405A/3Q96QSR 1 October 18, 1996 <br />