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ATTACHMENT C <br /> FIELD AND LABORATORY PROCEDURES <br /> Soil Sampling <br /> Soil samples were collected by advancing 2-inch-diameter brass sample liners into undisturbed <br /> soil, reached through the center of the drill auger. Soil samples for chemical analysis were <br /> retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps. The <br /> samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory <br /> accompanied by the appropriate chain-of-custody documentation. <br /> Soil Sampling for Stockpiled Soil <br /> Soil samples were collected by advancing 2-inch diameter brass sample liners into the soil <br /> stockpile, after removing approximately 6 inches to 1 foot of surface material in the sample <br /> location. One composite sample was collected per approximately 100 cubic yards of soil. Soil <br /> samples for chemical analysis were retained in the brass liners, labeled, and capped with <br /> Teflon sheets and plastic end caps. The samples were then sealed in zip-lock bags, placed on <br /> ice, and transported to the laboratory accompanied by the appropriate chain-of-custody <br /> documentation. <br /> Laboratory Analysis for Soil Samples <br /> Analyses for TPH-g, benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and MtBE <br /> were performed by DHS LUFT Method. Fuel Oxygenates were analyzed by EPA Method <br /> 8260. Analysis for lead was done using EPA method 6010A. <br /> Groundwater Sampling Procedures <br /> The sampling procedure for each well consists first of measuring the water level and checking <br /> for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator <br /> and a clear Teflon® bailer or an oil-water interface probe. Wells not containing SPH that do <br /> not have submerged screens are then sampled without purging. Wells that have submerged <br /> screens are purged of approximately three casing volumes of water (or to dryness) using a <br /> centrifugal pump, gas displacement pump, or bailer. Equipment and purging method used for <br /> 76600-022-02/well install.doc C- 1 July 7, 1999 <br />