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Harlin Knoll September 23, 1994 ell Page 2 Samples collected from the oil supply line and used oil line excavation were analyzed for ■ Volatile organics by EPA Method 8010, ■ Total oil and grease by EPA 413 2, ■ TPH as diesel (fPHd) by EPA Method 8015 (modified), CAM Metals (EPA 6000 and 7000 series), and ■ Polychlorinated biphenyls (PCBs) and pesticides by EPA Method 8080 20 FIELD ACTIVITIES AND RESULTS The following sections describe methods used to conduct the line removal and sod sampling procedures . 2.1 Safety Considerations Groundwater Technology developed a Site Safety Plan to provide a safe working environment and to comply with Occupational Safety and Health Administration (OSHA) Regulation 29 CFR 1910 120 This plan addressed specific environmental work-site hazards and presented contingency plans for site personnel All Groundwater Technology and subcontractor personnel working at the site reviewed the plan and followed the guidelines 2 2 Demolition and Removal of the Dispenser Islands and Product Lines iThree underground storage tanks (UST) containing gasoline, one UST containing used oil, and the product dispensers were removed in 1987 and 1988 (Figure 1) Recent construction activities included demolition of the dispenser island canopy, and removal of the former gasoline product Innes and dispenser islands, six oil supply lines, and one used oil line Initial demolition activities began on August 4, 1994, and were completed August 12, 1994 Gasoline product lines ran north-south, parallel to the dispenser islands, and then west toward the former USTs (Figure 2) The oil supply lines ran south from the former pay booth, and then west to the Sears Auto Center The used oil line followed the same trench as the supply lines, but continued toward the west to the former UST location On August 10 through 12, Sears' contractor Norm Wilson and Sons used a backhoe to uncover the product lines and remove the dispenser islands The soil directly above the product lines was removed with a shovel to avoid damaging the lines The excavated sod and pea gravel was stockpiled on site 1288GAS RPT ❑0� GROUNDWATER Sears 41288 Stockton ❑�❑ TECHNOLOGY