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QUARTERLY SUMMARY REPORT <br /> • 4TH QTR - 1993 <br /> (OCTOBER - DECEMBER) <br /> UNOCAL SERVICE STATION #6348 <br /> 3788 Tracy Boulevard <br /> Tracy, California <br /> City/County ID # NIA <br /> COUNTY San Joaquin _ <br /> BACKGROUND <br /> During removal of an underground waste oil tank in 1990, soil contamination was discovered A <br /> portion of the contaminated soil was removed In 1991 four monitoring wells were installed Sod <br /> borings delineated the extent of oil contamination in addition to gasoline contamination adjacent to the <br /> fill pipe Monitoring Well MW-3 was abandoned on November 24, 1992 in preparation for the removal <br /> of the underground fuel tanks The underground fuel tanks and associated piping were removed on <br /> December 23, 1992 Overexcavation of hydrocarbon affected sod was conducted around the former <br /> underground fuel tanks and the pump islands Approximately 1,320 gallons of groundwater were <br /> pumped from the tank excavation during the backfill operation Quarterly groundwater monitoring and <br /> sampling was conducted on March 17, 1993 No dissolved hydrocarbons were detected in the <br /> groundwater from the three remaining monitoring wells at the site <br /> RECENT QUARTER ACTIVITIES <br /> Well MW-3A was installed at the site on November 29, 1993 to replace well MW-3 which was <br /> abandoned in preparation for the removal of the underground fuel tanks during November 1992 All <br /> the remaining sod stock piles were characterized and disposed of at local class III landfills Quarterly <br /> monitoring and sampling of groundwater was conducted on December 8, 1993 <br /> NEXT QUARTER ACTIVITIES <br /> Quarterly Monitoring and Sampling is scheduled to occur during March 1994 <br /> CHARACTERIZATION / REMEDIAL STATUS <br /> Soil contamination delineated? Yes <br /> Dissolved groundwater contamination delineated? Yes <br /> Free product delineated? none <br /> Amount of groundwater contaminant recovered this quarter? 0 nal <br /> Soil remediation in progress? Completed 01/19/93 <br /> Dissolved/free product remediation in progress? No <br /> - anticipated start? None <br /> - anticipated completion? None <br /> CONSULTANT/CONTRACTOR Mittelhauser Corporation <br /> is <br /> 2168RO07 wp 1/20/94 <br />