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ATTACHMENT E PROPOSED FIELD AND LABORATORY PROCEDURES Exploratory Drilling The soil borings will be drilled using 8-inch hollow-stem auger drilling equipment. Borings will be Iogged by a Pacific Environmental Group, Inc. geologist using the Unified Soil Classification System and standard geologic techniques. Soil samples for logging will be collected at 5-foot depth intervals using a California-modified split- spoon sampler. The sampler will be driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop. All soil samples for chemical analysis will be retained in brass liners, capped with Teflon squares and plastic end caps, taped, and sealed in clean zip-lock bags. The samples will be placed on ice for transport to the laboratory accompanied by chain-of-custody documentation. All down-hole drilling and sampling • equipment will be steam-cleaned following the completion of the soil boring. Down- hole sampling equipment will be washed in a tri-sodium phosphate or alconox solution between samples. Hydropunch Groundwater Sampling The HydropuncO will be advanced approximately 1 to 2 feet into undisturbed soil at several depths within the saturated zone in the downgradient boring location using the drill rods and drill rig hydraulic system. Once the Hydropunce is advanced to the sampling depth, the drill rods will be retracted approximately 18 inches to expose the polypropylene screened sampling port. The samples will then be collected using either a clean stainless-steel bailer and placed into appropriate EPA-approved containers. The samples will be placed on ice for transport to the laboratory accompanied by chain-of- custody documentation. All down-hole drilling and sampling equipment will be steam- cleaned following the completion of the soil boring. Down-hole sampling equipment will be or washed in a tri-sodium phosphate or alconox solution between samples. Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10.2 eV lamp or a flame ionization detector (FID). The test procedure will involve 920-078.1A/SOLGWRPT E-1 November 24, 1997