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ATTACHMENT FIELD AND LABORATORY PROCEDURES HEALTH AND SAFETY Prior to performing field work at the site, SECOR will prepare a site-specific health and safety plan (SSHSP) as required by the Occupational Health and Safety Administration (OSHA) standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120). The site specific health and safety plan will be reviewed by the project manager, field staff and contractors before beginning field operations at the site. EXPLORATORY DRILLING A total of seven soil borings will be drilled using either 8-inch hollow stem auger drilling equipment and logged by a SECOR representative using the Unified Soil Classification System and standard geologic techniques. Soil samples for logging will be collected at 5-foot intervals using a modified split spoon sampler. The sampler will be driven ahead of the auger flights a maximum of 18 inches using a 140-pound hammer with a 30-inch drop. Soil samples will be retained in brass liners, capped with Teflon squares and plastic end caps, 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. Down-hole drilling equipment will be steam cleaned prior to drilling each soil boring. Down-hole sampling equipment was washed in an Alconox, or similar solution between samples. ORGANIC VAPOR MONITORING 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. The test procedure will involve measuring approximately 30 grams from an undisturbed soil sample, placing this sub-sample in a sealed container (either zip-lock bag or Mason jar). The container will be warmed for no less than ten minutes in the sun), then the head-space within was tested for total organic vapor, measured in parts per million as benzene (ppm; volume/volume). The instrument will be calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55, which relates the photo-ionization potential of benzene to that of isobutylene at 100 ppm. The results of the field screening will be noted on boring logs. PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory analyses. LABORATORY PROCEDURES Selected soil samples and groundwater samples collected will be analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg) by US Environmental Protection Agency (EPA) Method 8015M, and for Benzene, Toluene, Ethylbenzene, and total xylenes, (BTEX), methyl tertiary-butyl ether (MtBE), ethyl tertiary-butyl ether (ETBE), tertiary amyl methyl ether (TAME), tertiary-Butyl alcohol (TBA), and diisopropyl ether(DIPE) by EPA Method 8260B. SOIL CUTTINGS AND RINSATE WATER Soil cuttings generated during drilling operations will be temporarily stored onsite in an area inaccessible to the public (Figure 2) in DOT-approved 55-gallon drums pending characterization and disposal. Soil cuttings will be removed by Chevron's disposal contractor to an appropriate disposal or treatment facility. Soil cuttings and rinsate water drums will be temporarily stored onsite for approximately 4 to 8 weeks.