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i I ATTACHMENT C FIELD AND LABORATORY PROCEDURES Exploratory Drilling The soil borings were drilled using 8-inch hollow-stem auger drilling equipment. Borings were logged by a SECOR International Incorporated scientist using the Unified Soil Classification System and standard geologic techniques under the direction of a registered geologist. Soil samples for logging were collected at 5-foot depth intervals using a California-modified split-spoon sampler. The sampler was driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop. All soil samples for chemical analysis were retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in clean zip-lock bags. The samples were placed on ice for transport to the laboratory accompanied by chain-of-custody documentation. All down-hole drilling and sampling equipment was steam-cleaned following the completion of each soil boring. Down-hole sampling equipment was washed in a tri-sodium phosphate or alconox solution between samples. Soil Sampling Soil samples were collected by advancing 2-inch-diameter brass sample liners into undisturbed soil, reached through the center of the drill auger. Soil samples for chemical analysis were retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps. The samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation. Soil Sampling for Stockpiled Soil Soil samples were collected by advancing 2-inch diameter brass sample liners into the soil stockpile, after removing approximately 6 inches to 1 foot of surface material in the sample location. One composite sample was collected per approximately 100 cubic yards of soil. Soil samples for chemical analysis were retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps. The samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation.