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Laboratory Analysis of Excavation Samples Analysis for total petroleum hydrocarbons calculated as gasoline was performed by modified EPA Method 8015 Analysis for total petroleum hydrocarbons calculated as diesel was performed by the DHS LUFT method Analysis for benzene, toluene, ethylbenzene, xylenes, and methyl tertiary butyl ether (MtBE) were performed by EPA Method 8020 Confirmation analysis for MtBE was performed by EPA Method 8260 Analysis for volatile organic compounds was performed by EPA Method 8240 Analysis for semi-volatile organic compounds was performed by EPA Method 8270 Analysis for total oil and grease was performed by the gravimetric method, EPA Method 5520 E and F These analytical methods utilize gas chromatography and flame-ionization detection, photo-ionization detection, or mass spectrometry Analyses for metals (cadmium, chromium, lead, nickel and zinc) was performed by California Assessment Manual techniques The samples were extracted by chemical wet- lab techniques which vary by metal analyte Detection was by atomic absorption, mass spectrometry, flame spectrometry, or photo-spectrometry, depending on the metal analyte Exploratory Drilling The soil boring will be drilled using 8-mch hollow-stem auger drilling equipment The borings will be terminated once two consecutive "clean" samples (based on field observations and measurements) are collected, refusal occurs, or groundwater is encountered The boring will be logged 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, 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 Organic Vapor Procedures During Drilling Activities 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 flame ionization detector (FID) The test procedure will involve 9200391A/SITEPULL DOC A - 2 March 24, 1997