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ENCON <br /> 5.0 PROPOSED SUBSURFACE INVESTIGATION WORK <br /> The scope or work associated with the proposed targeted subsurface soil and soil gas investigation <br /> is briefly described below. <br /> 5.1 Pre-Mobilization Final Site Inspection Activities <br /> Prior to mobilization to the Subject Site, ENCON will conduct a final site inspection for access <br /> and if any other suspected areas of concern were identified for testing. The boring locations will <br /> be marked and logged for subsequent field drilling. The Subject Site perimeter,public areas, will <br /> also be marked for USA Dig Alert utility clearance purposes. <br /> 5.2 Subsurface Soil and Soil Gas Field Work Notification <br /> ENCON will notify Underground Service Alert (USA North) to clear public utility lines as <br /> required to define onsite utilities at least three (3) business days prior to mobilizing and starting <br /> onsite drilling activities. In addition, ENCON shall notify SJEHD in advance of mobilization to <br /> the Subject Site. <br /> 5.3 Health and Safety Plan <br /> ENCON shall prepare a site-specific Health and Safety Plan (HSP) and implement the HSP Plan <br /> under the direction of ENCON Environmental& Safety Supervisor. ENCON will conduct on-site <br /> tailgate safety and daily assignment meetings with field staff and tenant personnel involved in the <br /> project prior to the commencement of drilling activities on a daily basis. <br /> 5.4 Drilling Equipment <br /> Borings will be advanced with a direct-push drill rig to include a 5400 truck-mounted Geoprobe <br /> and/or limited access 54MT Geoprobe by ENCON drilling team under the direction of the <br /> Environmental Field Supervisor. <br /> 5.5 Soil Sampling Methodology <br /> Soil samples will be collected using a direct-push drill rig which will advance a 3-foot long by <br /> 2.25-inch diameter outer casing into the subsurface. An inner drill string consisting of a 3-foot <br /> long by 1.125-inch diameter acetate liner connected to 1.25-inch diameter center rods will be <br /> driven into the subsurface flush with the lead outer casing to allow undisturbed soil to enter the <br /> open liner. The inner drill string will be retrieved from the cased boring to recover the soil-filled <br /> liner. A lengthwise section of each acetate liner will be removed with a splitting tool to expose <br /> the soil core, and soil sampling will proceed as described until the terminal depth is reached. <br /> 7 <br />