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ERI 205505 1201 Tosco Service Station 5886,Stockton California December 28, 1994 2.0 SITE DESCRIPTION 21 Background It is ERI's understanding that Union Oil Company of California (Unocal) purchased the land to 1967, ' at which time the property was vacant In 1982, Unocal constructed a service station at the site and installed three 12,000-gallon USTs to store gasoline and diesel fuels (Delta Environmental Consultants, Inc [Delta], February 6, 1996) As presented in previous reports, a summary of site activities including remedial efforts at the site is as follows 1995 - Unocal removed three 12,000-gallon fuel USTs, product piping, and dispensers Unocal replaced the fuel USTs with two 15,000-gallon and one 12,000-gallon USTs The UST replacement activities included disposal of p p approximately 1,200 cubic yards of soil at Forward Landfill in Manteca, California and disposal of approximately 15,000 gallons of groundwater at ' Unocal's Rodeo, California facility (Delta, February 6, 1996) I • September 1995 - Unocal advanced 21 soil borings and collected soil and groundwater samples from the borings utilizing a Geoprobe® sampling system (Delta, February 6, 1996) • June 1996 - Pacific Environmental Group, Inc (PEG) performed a water-supply well survey within a one-quarter-mile radius of the site The survey identified 10 wells located within the survey area These wells are located northeast to southeast of the site and are apparently utilized as cathodic protection or irrigation wells (PEG, June 24, 1996) jSeptember 1996 - Unocal drilled four additional soil borings, and constructed groundwater monitoring wells in three of these borings (Delta, December 5, 1996) • March 1997 -- Tosco submitted a Work Plan for Supplemental Environmental Investigation (ERI, March 28, 1997) to the San Joaquin County Public Health Services (the County) ` 2