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ATTACHMENT D FIELD AND LABORATORY PROCEDURES Exploratory Drilling Geoprobe borings were advanced using 1 5" direct pushdrilling equipment The boring was logged by a SECOR geologist using the Unified Soil Classification System and standard geologic techniques Soil samples were collected at 5-foot depth intervals All soil samples for chemical analysis were retained in brass or plastic liners, capped with Teflon® squares and plastic end caps, and sealed in ZiplockTM-style 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 prior to and following the completion of the sod borings Down-hole sampling equipment was washed in a trisodium phosphate or alconox solution between samples Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for ionizable organic compounds using a flame-ionization detector (FID) or a PID with a 10 2 eV lamp The test procedure involved measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a ZiplockTM-type bag or in a clean glass far, and sealing the far with aluminum foil secured under a ring-type threaded lid The container was warmed for approximately 20 minutes (in the sun), then the head-space within the container was tested for total organic vapor, measured in parts per million as benzene (ppm, volumelvolume) The instrument was calibrated prior to drilling The results of the field- testing were noted on the boring logs (Attachment 4) FID/PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate petroleum hydrocarbon levels with the confidence of laboratory analyses Groundwater Sampling Procedures The sampling procedure for each included installing temporary casing into each boring Grab groundwater samples were then collected using a Teflon® bailer, placed into appropriate EPA-approved containers, labeled, logged onto a chain-of-custody document, and transported on ice to a California state- certified laboratory Laboratory Procedures Selected soil samples were analyzed for the presence of TPHg, BTEX, and MtBE by EPA Method 82606 (Single Run) Four samples collected from the drummed soil were composited at the laboratory, and analyzed for the presence of TPHg, BTEX, and oxygenates by EPA Method 8260B (Single Run) Soil Cuttings and Purge Water Sod cuttings generated during drilling operations were stored onsite pending characterization The sod was removed from the site by Filter Recycling Service geoprobe rpt 7-04 doc