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Quarterly Summary Report <br /> • First Quarter 1994 <br /> 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 1988 through <br /> February 1992 twelve on-site and three off-site borings were drilled, and four on-site <br /> monitoring wells, three on-site vapor extraction wells, and three off-site monitoring <br /> wells were installed Analytical results indicate that soil near the eastern dispenser <br /> island contains gasoline hydrocarbons and groundwater has been impacted with <br /> gasoline hydrocarbons. <br /> RECENT QUARTER ACTMTIES <br /> Unocal has pursued an off-site encroachment agreement to install two groundwater <br /> . monitoring wells south and east of the site. First quarter 1994 quarterly <br /> groundwater monitoring and sampling were performed on February 18, 1994 An <br /> MPDS Services report documenting the first quarter monitoring event was <br /> submitted. <br /> NEXT QUARTER AC"I MTIES <br /> Quarterly groundwater monitoring and sampling will be performed by MPDS <br /> Services in May 1994 Two off-site groundwater monitoring wells will be installed <br /> for the delineation of dissolved hydrocarbons. <br /> CHARACTERIZATION/REMEDIAL STATUS <br /> Soil contamination delineated) Yes. <br /> Dissolved groundwater delineated? No <br /> Free product dehneated9 Not applicable <br /> Amount of groundwater contaminant recovered this quarter? None <br /> Soil remediation in progress9 No <br /> Anticipated start date? Unknown <br /> Anticipated completion date? Unknown. <br /> Dissolved/free product remediation in progress? No <br /> Anticipated start? Not applicable <br /> Anticipated completion? Not applicable. <br /> • CONSULTANT Pacific Environmental Group, Inc <br /> 31004002/10940SR 1 April 14, 1994 <br />