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n 0 n GRA l LA1 D ENVIRONMENTAL CONSULTING SERVICES December 20, 1996 022-130 Mr. Michael Walton Walton Engineering, Inc. P.O. Box 1025 West Sacramento, California 95691 Subject: Underground Storage Tank Removal Report Orlando's 5611 East Waterloo Road, Stockton, California Dear Mr. Walton: At the request of Walton Engineering, Inc., of West Sacramento, California, a registered geologist' from Grayland Environmental (Grayland) arrived at the property (site) located at 5611 East Waterloo Road in Stockton, California, on November 19, 1996, to assist with the removal of three underground storage tanks (Figure 1). Grayland collected individual soil samples for laboratory testing from beneath the former underground fuel storage tanks and fuel dispensers. Because the former fuel dispensers were located at the edge of the open tank excavation, it was not necessary to collect soil samples from beneath product delivery pipelines. In addition, soil sample composites were collected from the soil stockpile generated during the tank removal work. The site was occupied by Orlando's convenience store, which stored diesel fuel and two grades of unleaded gasoline in underground storage tanks for retail sale. The three underground storage tanks had capacities of approximately 8,000, 10,000, and 12,000 gallons each and were situated side by side near the center of the property (Figure 2). Fill ports were located at the southern ends of the underground storage tanks; former fuel dispensers were located immediately east of the three underground storage tanks. Former underground product delivery pipelines were located within the open tank excavation. The single-wall, carbon steel underground storage tanks had overfill protection, but were not wrapped. The surface of the site, surrounding the area of the former underground storage tanks, was covered predominantly with asphaltic -concrete and concrete. The remaining part of the site to the north of the storage tank area had bare soil exposed at the surface. The approximate 4,000 square -foot building, occupied by the convenience store, was situated near the southwest corner of the site (Figure 2). 2731 Quail Street Davis, California 95616 (916) 756-1441 Grayland 022-130.trr i December 20, 1996