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12 February 2001 AGE-NC Project No. 00-0806 Page 2 of 5 " to assess for total petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX) and methyl-tertiary butyl ether (MTBE) in the soil and/or ground water beneath the site.The preliminary subsurface investigation will consist of the following tasks: • Permitting and pre-field work activities; • Soil and ground water sample collection and analysis; and • Report preparation. The individual tasks are discussed below. 3.1. PRE-FIELD WORK ACTIVITIES A health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration,U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization,the area of excavation will be clearly marked and a utility clearance obtained through Underground Service Alert. 3.2. SOIL SAMPLE COLLECTION AND ANALYSIS Initially,AGE proposes to advance three soil probe borings using direct push technology(DPT)to determine if petroleum hydrocarbon and/or halogenated volatile organic compound contamination is present in soil and ground water beneath the site.The proposed probe boring location is illustrated in Figure 2. Each probe boring will be advanced to a depth of approximately 25 feet below surface grade(bsg). The proposed boring locations maybe modified due to field observations or additional borings may be advanced with approval by the PHS-EHD. Soil samples will be collected at 5-foot intervals beginning at 5 feet bsg extending to the total probe boring depth. Field procedures for advancement of the soil probe boring and collection of soil samples are presented in Sections 4.1 and 4.2. Selected soil samples from the probe borings will be submitted for laboratory analysis with concurrence of the PHS-EHD. The selected soil samples will be analyzed by a State of California Department of Health Services(DHS)-certified laboratory for the following constituents: • TPH-g in accordance with EPA Method 5030/8015M; and Advanced GeoEnvironmental,Inc.