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'5 Mav 200' AGE-NC Project No. 98-0426 Paac 3 of 6 • Permitting and pre-field work activities; • Soil sample collection and analysis; • Ground water sample collection and analvsis; • Calculation of the remaining hydrocarbons mass in soil and modeling of the `round water plume migration; and • Report preparation. 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be obtained from the PHS-EI-ID. Prior to mobilization,each proposed soil probe boring location will be clearly marked and a utility clearance obtained through Underground Service Alert. As required by PHS-EHD permitting, an updated health and safety plan is included in accordance with Occupational Safetv 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). 3.2. SOIL SAMPLE COLLECTION AND ANALYSIS AGE proposes to advance three soil probe borings, one at the former UST location, one to the northwest and one to the south of the former UST location to assess the lateral and vertical extent of petroleum hydrocarbon impacted groundwater at the site. Proposed probe boring locations are illustrated in Figure 2. The soil probe borings will be advanced to an estimated depth of between 50 and 60 feet bsg to assess the vertical extent of impacted soil and ground water. Total depths of the probe borin4gs will be based on field observations and field screening using an organic vapor monitor(OVM). Soil samples will be collected from two of the probe borings (B-8 and B-9) at five-foot intervals from ground surface to the total depth. Field procedures for advancement of probe borings and collection of soil samples are presented in Sections 4.1 and Section 4.2, respectively. Selected soil samples will be analyzed by a California Department of Health Services (DHS)- certified laboratory for: Advanced GeoEnvironmcntal,Inc.