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SECTION 2 INVESTIGATION ACTIVITIES ERM proposes to construct and sample, at a minimum, one ground water monitoring well (MW-5A) and three soil borings (B-1A, B-2A and B-3A) (Figure 1) The monitoring well and soil borings will be installed to provide information regarding the lateral extent of TPH-G, TPH-D and related BTEX to the north and east of the UST excavation MW-5A will be located approximately 20 feet north of MW-1A Borings B-1A and B-2A will be located approximately 20 feet to the northwest and northeast of MW-1A, respectively B-3A will be situated approximately 20 feet to the east of MW-3A. Based on fundings obtained in the field during drilling and sampling, additional soil borings and/or monitoring wells may be installed The criteria for determining whether additional borings/wells are needed are discussed in the section titled "Drilling Activities and Soil Sampling " for Drilling ERM-West will utilize the services of Underground Services Alert and an underground utilities locator to maximize the likelihood that borings are placed in locations which are sufficiently removed from underground utilities and hazards (pipes, electric lines, etc ) The proposed drilling locations in this work plan are subject to slight modifications based on the findings of the subsurface utilities investigation All of the proposed drilling is to be situated in areas that are easily accessible to a drill rig Activities and Soil Sampling The maximum depth of MW-5A will be 25 feet Based on the results obtained during the installation of MW-1A, we anticipate that ground water will be encountered within the first 20 feet of drilling Soil borings B-1A through B-3A will be drilled to the approximate base of the unsaturated zone which is estimated to have a maximum depth of 12 feet below the surface. 2-1