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3.0 WORKPLAN i Park has developed a scope of work to address the terms outlined in the above referenced letter from the PHS/EHD dated August 30, 1991 The proposed scope of work was summarized in Section 12, and selected assessment activities are further described in the following sections 3.1 Utility Survey Prior to conducting any subsurface investigations Underground Service Alert will be notified to locate any utilities entering the site This will serve to assess any potential drilling obstructions beneath the subject site and enhance the assessment of man-made structures potentially acting as conduits for migration of contaminants 3.2 Soil Borings Three soil bonngs will be drilled to total depths of approximately 75 feet bgs or 20' feet below first groundwater for soil sampling and installation of groundwater monitoring wells One additional shallow soil boring will be drilled to the depth of approximately 20 feet bgs for soil sampling and installation of a vapor extraction well The locations of the groundwaterlmonitonng wells will be directly adjacent to previously drilled wells S-1, MW-1, and MW-2 These locations are shown on Figure 2 . Soil borings will be advanced using a truck mounted drill ng with hollow-stem continuous flight augers The augers will be steam cleaned prior to drilling each boring The llthology and other pertinent data will be recorded on a field boring log in accordance with the Unified Soil Classification System (USCS) Soil cuttings from the borings will be placed in DOT-approved 55-gallon drums until evaluated and verified with analytical results as to whether or not the soils are contaminated If the material is contaminated, a wntten plan will be submitted by Park outlining alternatives Disposal will be the responsibility of the facility operator and must occur within 90 days of completion of drilling All soil borings will be backfilled by pouring a bentonite cement slurry through the auger 3.3 Soil Sampling Soil samples will be collected at 10-foot intervals from the ground surface to 50 feet From 50 feet to first occurrence of groundwater soil samples will be collected at 5-foot intervals It is not known where first groundwater will be encountered, but is estimated to be approximately 55 feet bgs Soil samples will be collected through the auger in three 6-inch long brass sleeves with 2- inch diameter in a split-spoon sampler The sampler is driven ahead of the auger by a 140 pound A 1125J1 WP 4