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V <br /> ATTACHMENT A <br /> FIELD AND LABORATORY PROCEDURES <br /> Exploratory Drilling <br /> The soil borings will be drilled using 8-inch hollow-stem auger drilling equipment to depths <br /> of approximately 10 to 55 feet below ground surface (bgs) Borings will be logged by a <br /> Pacific Environmental Group, Inc geologist using the Unified Soil Classification System and <br /> standard geologic techniques Soil samples for logging will be collected at 5-foot depth <br /> intervals using a California-modified split-spoon sampler The sampler will be driven a <br /> maximum of 18 inches using a 140-pound hammer with a 30-inch drop All soil samples for <br /> chemical analysis will be retained in brass liners, capped with Teflon squares and plastic end <br /> caps, and sealed in clean zip-lock bags The samples will be placed on ice for transport to the <br /> laboratory accompanied by chain-of-custody documentation All down-hole drilling and <br /> sampling equipment will be steam-cleaned following the completion of the soil boring <br /> Down-hole sampling equipment will be washed in a tri-sodium phosphate or alconox <br /> solution between samples <br /> Product Dispenser Sampling Procedures <br /> One soil sample will be collected beneath each product dispenser Due to access limitations, <br /> these samples will be collected with a trowel rather than a hand auger or a slide hammer <br /> Samples will be contained in sealed glass bars The samples will be placed on ice for <br /> transport to the laboratory accompanied by chain-of-custody documentation Down-hole <br /> sampling equipment will be washed in a tri-sodium. phosphate or alconox solution between <br /> samples <br /> Organic Vapor Procedures <br /> Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the field <br /> for ionizable organic compounds using the HNU Model PI-101 (or equivalent) photo- <br /> ionization detector (PID) with a 10 2 eV lamp The test procedure will involve measuring <br /> approximately 30 grams from an undisturbed soil sample, placing this subsample in a clean <br /> glass far, and sealing the lar with aluminum foil secured under a ring-type threaded lid The <br /> 9310021A\WPLAN A - 1 August 27, 1997 <br />