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25 April 2000 AGE-NC Project No. 95-0144 Page 2 of 4 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), is currently on-file with the PHS-EHD.Prior to mobilization, the area of excavation will be clearly marked and an utility clearance obtained through Underground Service Alert. 3.2. SOIL SAMPLE COLLECTION Four soil probe borings will be advanced using direct push technology. The soil borings will be advanced in the area northwest of MW-12 as outlined by T&R. Proposed probe boring locations are illustrated in Figure 2. Soil samples will be collected at depths of 6, 10 and 15 feet below surface grade (bsg). Field procedures for advancement of borings and collection of soil samples are presented in Section 4.2. 3.3. GRAB WATER SAMPLE COLLECTION A grab water sample will be collected from one boring (15B-9) using a Geoprobe water sampling assembly. Samples will be collected into 40-m1 volatile organic analysis (VOA)vials, 1-liter amber bottles and plastic bottles as appropriate for the required analyses. Ground water sample collection procedures are presented in Section 4.3. 3.4. LABORATORY ANALYSES Each of the soil samples and the grab water sample collected will be submitted for laboratory analysis. The samples will be analyzed by Curtis&Tompkins,Ltd.,a State of California Department of Health Services (DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d and TPH-mo) by EPA Method 8015 Modified; • Volatile aromatic compounds(benzene, toluene, ethylbenzene and total xylenes: BTEX), by EPA Method 8020; and • Total lead by EPA Method 6010. Soil and grab water samples collected from boring 15B-9 will also be analyzed for: • Volatile organic compounds by EPA Method 8260. Advanced GwEnvironmental,Inc.