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EV PRELIMINARY REPORT AND TANK CLOSURE REPORT Trary Boulevard Shell 3725 Tracy Boulevard,Tracy,California Delta Project No.40-89.012 Page 2 C Define the extent of petroleum constituents in soil beneath the site. • Document replacement Of monitoring wells destroyed during station reconstruction. s Present ground water sampling results on the replacement wells to determine whether petroleum constituents are present in ground water beneath the site. 2.0 BACKGROUND INFORMATION The site is currently an operating Shell service station located at 3725 Tracy Boulevard in Tracy,California (Section 17,Township 2 South,Range 5 East,MDB&M). Records from the San Joaquin County Assessor's Office indicate that this is Parcel No. 211-464-30, and that the land is owned by Shell. Shell's regional representative is Mr. Ray Newsome,District Engineer,East Bay District,Concord, California. The area surrounding the site is flat and situated in a commercial and resid=tial area. The site is located f. immediately north of Interstate 245 at tate Tracy Boulevard exit. 2.1 site Ili- aa- The existing retail gasoline outlet was constructed between April 30 and August 17, 1990,and replaced an outlet constricted in I967. The existing buildings and facilities at the site are shown in Figure 2,and tite layout Of the facility and buildings prior to April 30,I990,is shown:n Figure 3. Both figures disulay existing and former underground storage tank locations. The previous station was constructed in 1967 and two 8.000- and 10,004-gallon singly:-walled steel underground storage tanks were installed. A third 8,000-gallon steel rnt:iprground storage tank was installed in 1970. In 1985,all three steel tanks were removed and replaced with three 10,M, -gallon,double-walled fiberglass tanks. The fiberglass tanks were installed in the same location as the former steel tanks. The Fortner storage tank location is shown in Figures 2 and 3. In May and June of 1990,the fiberglass tanks were -- removed and replaced with four 12,000-gallon,double-walled fiberglass tanks. These tanks were placed in a new location(Figures 2 and 3). ..__A_waste_oil.tank -of_unknown.size was removed from the sitz in-1985.-The foitrier location of this tank is --- - - ----- ----- — - -- unknown at this time.