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0 A SOIL CONTAMINATION ASSESSMENT Lockeford Mini Mart NGA Project No. 10-90-104 Page 3 3.0 TANR REMOVAL On March 21, 1990 B & C Construction removed four USTs and associated product dispensing lines from the site. All excavated USTs appeared to be structurally intact and in good condition. No obvious corrosion of the tanks was evident from visual inspection. No fuel staining was observed on soils adhering to the tank surfaces or within the tank pit excavation. soils removed from the tank excavation (approximately 800 yards 3) has been stockpiled behind the station building pending evaluation of soil sample analytical results. Tank information is presented in Table 1. TABLE i Tank :Information Size (gals) Product Stored Acte aatt>.s 8,000 Premium Unleaded Gasoline 1970 Falaved 8,000 Unleaded Gasoline 1965 FeaDyEd - 5,000 Regular Leaded Gasoline 1965 Famwd 5,000 Regular Gasoline 1965 FtnT 3.1 Boil Sam 1e Co3lecti0n Soil samples were collected along product dispensing lines and from beneath both ends of the removed USTs at locations specified by a representative of the San Joaquin county Public Health services. Soil sample locations are shown on Figured 3. Soil samples were obtained by excavating native soil to a depth of two to three feet beneath product dispensing lines and the locations of the removed USTs by use of a backhoe and excavator. Soil samples were collected from the backhoe/excavator bucket by advancing clean, 6- inch-long brass tubes into the native soil. Upon recovery the brass tube was capped, sealed, and placed in an ice-filled cooler until delivery to the laboratory. A chain-of-custody form was used to document transmittal and receipt of the soil samples. Photo- graphs 1-3 on the following pages show the procedure used during tank removal.