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f mm <br /> S E C 0 R <br /> QUARTERLY SUMMARY REPORT <br /> Fourth Quarter 2004 <br /> 76 Service Station #5886 <br /> 2701 West March Lane, Stockton, CA <br /> City/County ID # Stockton <br /> County San Joa uin <br /> PREVIOUS ASSESSMENT <br /> Union Oil Company of California (Unocal) purchased the land in 1967, at which time the property <br /> was vacant In 1982, Unocal constructed a service station at the site and installed three 12,000- <br /> gallon underground storage tanks (USTs) to store gasoline and diesel fuels (Delta Environmental <br /> Consultants, Inc [Delta], February 6, 1996) <br /> As presented in previous reports, a summary of site activities including remedial efforts at the site <br /> is as follows <br /> • 1995— Unocal removed three 12,000-gallon fuel USTs, product piping, and dispensers <br /> Unocal replaced the fuel USTs with two 15,000-gallon and one 12,000-gallon UST The <br /> UST replacement activities included disposal of approximately 1,200 cubic yards of soil at <br /> Forward Landfill in Manteca, California and disposal of approximately 15,000 gallons of <br /> groundwater at Unocal's Rodeo, California facility (Delta, February 6, 1996) <br /> • September 1995 - Unocal consultants advanced 21 soil borings and collected soil and <br /> groundwater samples from the borings utilizing a Geoprobe®sampling system (Delta, <br /> February 6, 1996) <br /> • June 1996 - Unocal consultants performed a water-supply well survey within a one- <br /> area These wells are located northeast to southeast of the site and are apparently <br /> utilized as cathodic protection or irrigation wells (PEG, June 24, 1996) <br /> • September 1996- Unocal consultants drilled four additional soil borings, and constructed <br /> groundwater monitoring wells in three of these borings (Delta, December 5, 1996) <br /> • March 1997—April 1997 Tosco consultants submitted a Work Plan for Supplemental <br /> Environmental Investigation (ERI, March 28, 1997) and an Addendum to Work Plan (ERI, <br /> April 3, 1997) <br /> • April 1997 —Tosco consultants performed a soil and groundwater investigation at the site <br /> in accordance with the Work Plan for Supplemental Environmental Investigation (ERI, <br /> March 28, 1997) and the Addendum to Work Plan(ERI, April 3, 1997) The investigation <br /> included hand-auguring three soil borings adjacent to catch basins, drilling four soil <br /> borings, and constructing dual-completion groundwater monitoring wells (MW4S/D <br /> through MW7S/D) at discrete depths in the borings (ERI, June 3, 1997) <br /> • July 1997—August, 1997 Tosco consultants submitted a Work Plan for Supplemental <br /> Environmental Investigation (ERI, July 14, 1997) and an Addendum to Work Plan (ERI, <br /> August 8, 1997) <br />