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Quarterly Summary Report <br /> . Second Quarter 1996 <br /> Former Unocal Service Station 2859 <br /> 1665 Pacific Avenue <br /> Stockton, Califorrua <br /> County STID 9 None <br /> County San Joaquin <br /> BACKGROUND <br /> Underground storage tanks removed in March 1988 From March 1988 through Novem- <br /> ber 1994, a total of 12 on-site and 3 off-site bonngs were dnlled, 4 on-site monitoring <br /> wells, 3 on-site soil vapor extraction (SVE) wells, and 5 off-site monitoring wells were <br /> installed Analytical results indicate that soil near the eastern dispenser island contains <br /> gasoline hydrocarbons and groundwater has been impacted with gasoline hydrocarbons <br /> A work plan to initiate a 6-month SVE test was submitted on July 14, 1995 A 30-day <br /> public notification for air pernutting was initiated, and an air permit to construct was re- <br /> ceived in December The SVE remedial system was constructed in January 1996 Start-up <br /> and operation of the SVE re-medial system was initiated, and a report documenting <br /> startup activities of the ground-water momtonng system was submitted to Unocal in Janu- <br /> ary The SVE system was designed to operate as a 6-month pilot test <br /> RECENT QUARTER ACTIVITIES <br /> Quarterly groundwater monitoring and sampling were performed in May 1996 A remedial <br /> performance summary report documenting SVE system performance in the first quarter <br /> 1996 was submitted Operation and maintanence of the remedial system was performed <br /> NEXT QUARTER ACTIVITIES <br /> Third quarter 1996 groundwater monitoring and sampling will be performed in August <br /> Operation and maintenance of the SVE system will continue through August 1996 Uno- <br /> cal will evaluate the effectiveness of the SVE remedial system to determine a long-term <br /> site strategy <br /> CHARACTERIZATION/REMEDIAL STATUS <br /> Soil contamination dehneated? Yes <br /> Dissolved groundwater delineated? Yes <br /> Separate-phase hydrocarbons delineated? Not applicable <br /> Amount of hydrocarbon contaminant recovered this quarter? Approximately 600 lbs <br /> Soil remediation in progress? Yes <br /> Start date? January 1996 <br /> • Anticipated completion date? August 1996 <br /> Dissolved/Separate-phase hydrocarbons remediation in progress? No <br /> 3100405A/2Q96QSR l My 18, 1996 <br />