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DEC 09 '94 02:57PM FUGRO WEST ROSEYILLE P.2/7 61req Sbell 60FAN S0®n WC Na.204.7 8` ) 876 Country CIA Smda .mIifam,a Our proposed scope of work includes the following: ■ To supervise the drilling and collection of soil samples from borings adjacent to the tank basin. The borings will penetrate the shallow saturated zone, which is anticipated to lie 12 to 30 feet below surface. ■ If field screening and analyses indicates the presence of petroleum hydrocarbons in soil and/or groundwater, Fugro will continue to Investigate the potential vertical and lateral extent. ■ To install a vapor extraction (VE) well in at least one of the borings. Any VE wells installed may be used immediately, or as necessary, for soil venting. ■ To investigate the presence of volatile hydrocarbons in the tank basin using a portable photo-ionization detector. Vapor extraction points may be installed in the tank basin, if possible, for immediate use, or as necessary. ■ To install a groundwater well in the vicinity of the tank basin. The well may also potentially be used for vapor extraction. If warranted, additional groundwater wells may be installed on site for monitoring and/or mitigation. ■ If impacted groundwater or separate-phase hydrocarbons are encountered near the tank basin, a pump truck may be used for direct removal. The first boring will be drilled adjacent to the south end of the tank basin in the area of investigation shown on Figure 2. Fugra's primary objective will be to access and remove petroleum hydrocarbons from the subsurface by vapor extraction and/or direct pumping of fluids. Additional borings may be drilled and sampled at other locations around the tank basin as required. Monitoring wells installed during the field work will be constructed according to the standards found in the California Code of Regulations, Title 23, Section 2647 and 2648, and the California Department of Water Resources Bulletin 74-81.