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ATTACHMENT C FIELD AND LABORATORY PROCEDURES Soil Borings The soil borings were drilled using 8-inch hollow-stem auger drilling equipment to the above referenced depths Borings were logged by a SECOR International Incorporated geologist using the Unified Soil Classification System and standard geologic techniques Soil samples for logging were collected using a 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 the sod boring Down-hole sampling equipment was washed in an alconox solution between samples 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 Sod 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 Organic Vapor Procedures Soil samples collected at approximate 5-foot depth intervals during drilling were analyzed in the field for ionizable organic compounds using a photo-ionization detector(PID) The test procedure involved measuring approximately 30 grams from a soil sample, placing this subsample in a clean clear ziplock plastic quart bag, and sealing the bag The head-space within the bag was tested for total organic vapor, measured in ppm as benzene(ppm, volume/volume) The instrument was calibrated prior to drilling using a 100 ppm isobutylene standard (in air) and a sensitivity factor of 55 which related the ionization potential of benzene to that of isobutylene at 100 ppm The results of the field testing were noted on the boring logs PID readings were useful for indicating relative levels of contamination, but were not used to evaluate hydrocarbon levels with the confidence of • laboratory analyses