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E � <br /> t <br /> RVICE <br /> ERI 6H1/IRONNENTAL RESOLUVONS, INC. <br /> July 22, 2003 <br /> ERI 205513 QSR25 <br /> Mr Edward C Ralston <br /> ConocoPhillips Company <br /> 76 Broadway <br /> Sacramento, California 95818-1105 <br /> Subject Quarterly Summary Report for Environmental Investigation, Second Quarter 2003, <br /> 76 Facility 5886, 2701 West March Lane, Stockton,California <br /> Mr Ralston <br /> At the request of ConocoPhillips Company(ConocoPhillips)(formerly Tosco Corporation), and pursuant <br /> to correspondence from San Joaquin County Public Health Services,Environmental Health Division <br /> (the County), dated July 24, 1997,Environmental Resolutions, Inc (ERI)is submitting this quarterly <br /> summary report for the subject site This quarterly report discusses work completed during second <br /> quarter 2003 <br /> BACKGROUND <br /> i <br /> It is ERI's understanding that Union Oil Company of California (Unocal)purchased the land in 1967, at <br /> which time the property was vacant The location of the site is shown on the Site Vicinity Map (Plate 1) <br /> In 1982, Unocal constructed a service station at the site and installed three 12,000-gallon underground <br /> storage tanks(USTs)to store gasoline and diesel fuels(Delta Environmental Consultants, Inc (Delta], <br /> February 6, 1996) The present site configuration is shown on the Generalized Site Plan(Plate 2) <br /> As presented in previous reports, a summary of site activities including remedial efforts at the site is as <br /> follows <br /> 1995 —Unocal removed three 12,000-gallon fuel USTs,product piping, and dispensers Unocal <br /> replaced the fuel USTs with two 15,000-gallon and one 12,000-gallon UST The UST <br /> replacement activities included disposal of approximately 1,200 cubic yards of soil at Forward <br /> Landfill in Manteca, California and disposal of approximately 15,000 gallons of groundwater at <br /> Unocal's Rodeo, California facility(Delta,February 6, 1996) <br /> September 1995 -Unocal advanced 21 soil borings and collected soil and groundwater samples <br /> from the borings utilizing a Geoprobe®sampling system(Delta, February 6, 1996) <br /> June 1996-Pacific Environmental Group, Inc (PEG)performed a water-supply well survey <br /> within a one-quarter-mile radius of the site The survey identified 10 wells located within the <br /> survey area These wells are located northeast to southeast of the site and are apparently utilized <br /> as cathodic protection or irrigation wells(PEG, June 24, 1996) <br /> 73 Digital Drive, Suite 100, Novato, California 94949-5791 415-382-9105 (FAX 415-382-1856) <br /> Lake Forest o !Novato o Seattle <br />