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10 M <br /> ERI <br /> ENVIRONMENTAL RESOLUTIONS, INC. <br /> • <br /> April 26, 2001 <br /> ERI 205513 QSR 16 <br /> Mr Ed Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> Subject Quarterly Summary Report for Environmental Investigation, First Quarter 2001, <br /> Tosca 76 Service Station 5886, 2701 West March Lane, Stockton, California <br /> Mr Ralston <br /> At the request of Tosco Marketing Company (Tosco), and pursuant to correspondence from <br /> San Joaquin County Public Health Services, Environmental Health Division(the County) dated <br /> July 24, 1997, Environmental Resolutions, Inc (ERI) is submitting this quarterly summary report for <br /> the subject site This quarterly report discusses work completed during first quarter 2001 <br /> BACKGROUND <br /> • It is ERI's understanding, that Union Oil Company of California (Unocal) purchased the land in 1967, <br /> at which time the property was vacant The location of the site is shown on the Site Vicinity Map <br /> (Plate 1) In 1982, Unocal constructed a service station at the site and installed three 12,000-gallon <br /> underground storage tanks (USTs) to store gasoline and diesel fuels (Delta Environmental Consultants, <br /> Inc f Delta], February 6, 1996) <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 USTs 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 within <br /> a one-quarter-mile radius of the site The survey identified 10 wells located within the survey area <br /> These wells are located northeast to southeast of the site and are apparently utilized as cathodic <br /> protection or irrigation wells (PEG, June 24, 1996) <br /> 73 Digital Drive,Suite 100, Novato, California 94949-5791 415-382-9105 (FAX 475-382-7856) <br /> Lake Forest • Novato 9 Seattle <br />