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PROBLEM ASSESSMENT REPORT Moreland Court Shell 7700 Moreland Court, Stockton,California ' Delta Project No 40-88-146 Page 4 ' 2.2 Site History Records from the San Joaquin County Assessor's office indicate the parcel number is 092-110-09, and the station has been owned by Ms Lynne Carroll since April 1, 1988 Shell owns the station budding, underground storage tanks, and piping A new, 550-gallon, double-wailed fiberglass waste oil tank was installed at the site in 1987 ' Due to the age of the steel underground storage tanks, Shell decided to replace the tanks with fiberglass tanks On December 27, 1988, the three steel underground storage tanks were excavated and removed from the site A tank closure report detailing tank removal activities was submitted to the County in April 1989 Three new 10,000-gallon double-walled fiberglass underground storage tanks were installed during the week of January 2, 1989 Former and existing tank sizes,types of product stored, age,and tank construction data are presented in Table 1 TABLE I ' Underground Storage Tank Information Tank Size Product Approximate Construction Lg,allons) Stored Me in Years Tye Status 7,500 Super Unleaded 20 Steel Removed ' 5,000 Regular Leaded 20 Steel Removed 5,000 Regular Unleaded 20 Steel Removed 10,000 Super Unleaded 2 Double-walled Fiberglass Active 10,000 Regular Leaded 2 Double-walled Fiberglass Active 10,000 Regular Unleaded 2 Double-walled Fiberglass Active ' 550 Waste Oil Tank 3 Double-walled Fiberglass Active i 2 3 Tank Closure Results On April 4, 1988, four soil borings (B-1 through 13-4) were advanced for the purpose of assessing the soils near the former tank location prior to excavation and removal of the three steel underground storage tanks Two additional soil borings (B-5 and B-6) were advanced at the proposed new underground storage tank location A site map illustrating the soil boring locations is presented in Figure 2