6D(6) Brownfields Grant Agreement - former RR property south of Studebaker Stamping

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• Crush and re -use on -site as backfill any concrete that must be removed to gain access to remediation areas, in order to minimize trucking backfill to the site. Following selection of the most responsive and responsible bidder, Hull will coordinate with the contractor to begin the work. Prior to removal and disposal, representative samples of the impacted soils at the Site will be collected and analyzed for landfill disposal approval, subject to the requirements of the landfill selected by the excavation contractor. Concurrent with securing landfill disposal approval, the appropriate utility clearances will be obtained from local utilities (both municipal and private). Hull has confirmed with the City's Engineering Department that, because the area of proposed excavation is less than one acre, a Construction /Stormwater Pollution Prevention Plan in accordance with 327 Indiana Administrative Code (IAC) "Rule 5" (327 IAC 15 -5) and "Rule 13" (327 IAC 15 -13) is not necessary. The March 2010 ABCA estimated that up to 2,420 cubic yards of soil may require excavation and off -site disposal. Two areas where concentrations of lead and arsenic in surface soils (i.e., 0 to 2 feet below ground surface (bgs)) exceed RISC Commercial /Industrial pathway- specific Closure Levels are shown on Figure 2. Initially, a smaller area will be staked horizontally and excavated to a depth of 2 feet bgs in an effort to minimize the volume of soil required for excavation and off -site disposal. That smaller area is indicated on Figure 2. Impacted soils will be excavated with a backhoe or tracked excavator and loaded directly to dump trucks for transport to the landfill for disposal. At the end of each day's activities, excavated areas that have not been backfilled to original grade will be barricaded with Occupational Safety and Health Administration (OSHA)- approved safety fencing. Following excavation of the initial area, Hull's field representative will collect confirmatory soil samples from the floor and sidewalls of the excavation at a grid density of approximately every 1,000 square feet (i.e., approximately every 32 feet) to evaluate whether concentrations of lead or arsenic in soils remain at concentrations exceeding pathway - specific standards. Soil samples will be analyzed for lead (for the western -most excavation) or arsenic (for the eastern- HULL & ASSOCIATES, INC. S61059.400.0004 INDIANAPOLIS, INDIANA 6 MAY 2010