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' 11/04/94 12 45 $619 450 2688 GROUNDWATER TEC$ ->-*4 CONCORD REG 10002/008 <br /> Harlin Knoll <br /> September 23, 1994 <br /> Page 2 <br /> Samples collected from the od supply line and used oll line excavation were analyzed for <br />' ■ Volatile organics by EPA Method 8010, <br /> i <br /> n Total oil and grease by TEPA 413 2, <br /> ■ TPH as diesel (TPH� by EPA Method 8015 (modirled), <br />' u CAM Metals (EPA 6000 and 7000 series); and <br /> ■ Polychlorinated biphenyls (PCBs) and pesticldes by EPA Method 8080 <br /> I <br />' 2.0 FIELD ACTIVITIES AND RESULTS <br /> The following sections describe methods used to conduct the line removal and soil sampling <br /> procedures. <br /> 2.1 Safety Considerations <br /> Groundwater Technology developed a Sfte Safety Plan to provide a safe working environment and to <br /> comply with occupational Safety and Heafth Administration (OSHA) Regulation 29 CFR 1910.120 <br /> This plan addressed specific environmental work-site hazards and presented contingency plans for <br />' site personnel_ All Groundwater Technology and subcontractor personnel working at the site <br /> reviewed the plan and followed the guidelines. <br />' 2.2 Demolition and Removal of the Dispenser Islands and Product Lines <br /> Three underground storage tanks (UST) containing gasoline, one UST containing used 011, and the <br />' product dispensers were removed In 1987 and 1988 (Figure 1) Recent construction actrvibes <br /> included demolition of the dispenser Island canopy, and removal of the former gasoline product lines <br />' and dispenser Islands, sic oil supply lines, and one used oil line. <br /> Initial demolition activities began on August 4, 1994, and were completed August 12, 1994 Gasoline <br /> product lines ran north-south, parallel to the dispenser islands, and then west toward the former <br /> USTs (Figure 2). The oil supply fines ran south from the former pay boU"h a; than 'Fest to the <br /> Sears Auto Center The used oil line followed the same trench as the supply lines, but continued <br /> rtoward the west to the former UST location On August 10 through 12, Sears' contractor Norm <br /> Wilson and Sons used a backhoe to uncover the product lines and remove the dispenser islands <br /> The soil directly above the product lines was removed with a shovel to avoid damaging the lines <br /> The excavated soil and pea gravel was stockpiled on site. <br /> GROUN❑0� WATER <br /> 'TFOiNODLOGY - <br /> Saam r12ae stoNaon <br />