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ATTACHMENT A FIELD AND LABORATORY PROCEDURES Exploratory Drilling Soil borings will be drilled using 8-inch hollow-stem auger drilling equipment. The borings will be logged by SECOR field staff using the Unified Soil Classification System and standard geologic techniques. Soil samples will be collected at 5foot 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 sleeves, capped with Teflon@) squares and plastic end caps, and sealed in ZiplockT""-style bags. The samples will be placed on ice for transport to the labora- tory accompanied by chain-of-custody documentation. All down-hole drilling and sampling equipment will be steam-cleaned prior to and following the completion of the soil borings. Down-hole sampling equipment will be washed in a trisodium phosphate or alconox solution between samples. Organic Vapor Procedures Soil samples collected at 5foot depth intervals during drilling will be analyzed in the field for ionizable organic compounds using a flame-ionization detector (FID) or a photo-ionization detector (PID) with a 10.2 eV lamp, The test procedure involves measuring approximately 30 grams of an undisturbed soil sample and placing this subsample in a ZiplockT"-type bag. The container will be warmed for approximately 20 minutes (in the sun). The head-space within the container will then be tested for total organic vapor, measured in parts per million as benzene (ppm by volume). The instrument will be calibrated prior to drilling. The results of the field-testing will be noted on the boring logs. FID/PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate petroleum hydrocarbon levels without the confidence of laboratory analyses. Laboratory Procedures . Selected soil samples will be analyzed for the presence of TPHg, BTEX, fuel oxygenates (MtBE, TAME, DiPE, ETBE, TBA), and fuel additives (1,2-DCA, and EDB) by EPA Method 826013. Four samples collected from the stockpiled soil will be composited at the laboratory, and analyzed for the presence of TPHg, BTEX, and MtBE by EPA Method 8260B, and total lead by EPA Method 601013. Soil Cuttings and Purge Water Soil cuttings generated during drilling operations will be temporarily stored onsite in DOT approved 55-gallon drums. Water generated during equipment cleaning will be stored in 55-gallon drums onsite pending characterization. The soil and water will be removed from the site by a licensed disposal contractor and transported to an appropriate disposal or treatment facility for proper disposal.