Supplemental Agreement No 2 - United Consulting - Coal Line Trail Phase I

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Mr. Devin Stettler CEC Proposal 161-618 — Phase II ESA Page 3 March 16, 2018 during the Phase I ESA, and preparation of the INDOT-approved site -specific Work Plan spreadsheet, which summarized our findings of each potential concern in relation to the Project Area and provided reasoning for proposed sampling activities. Copies of the INDOT-approved Work Plan spreadsheet and the accompanying map showing the proposed soil boring locations are attached. 3.2 Task 2 — Limited Phase II ESA To assess subsurface conditions at the Project Area via implementation of the INDOT-approved Work Plan, the following Phase II ESA activities are proposed: • CEC will advise INDOT of the proposed field schedule at least one week in advance of mobilizing to the site to initiate sampling. • CEC will mobilize to the site prior to beginning the invasive activities to mark the proposed boring locations for utility clearance purposes. • CEC will contact the Indiana Underground Plant Protection Service (IUPPS) to locate underground utilities prior to performing invasive activities. If deemed necessary, a third - party underground utility in the public ROW locating firm can be subcontracted by CEC for an additional fee to screen the proposed boring locations for possible private subgrade utilities. CEC assumes no liability for damage to private utilities at the site. • A site specific Health and Safety Plan will be prepared. • A pre -qualified subcontractor will be retained to advance the borings at the site under the direction of CEC. • CEC has proposed a total of 14 soil borings to characterize the soils at the Project Area. The proposed locations and spacing of the borings are based on the finalized INDOT- approved Work Plan prepared as part of Task 1 and are illustrated on the attached figure. Based on CEC's understanding of the proposed project construction disturbances, the borings will be advanced to depths ranging from five to eight feet below ground surface (bgs). o CEC will provide a qualified environmental professional to conduct the field screening and sampling, including observation and documentation of the field conditions. Sampling equipment, including the direct -push rig, the sampling tools, and other down - hole equipment will be decontaminated prior to arrival on -site and prior to each soil boring advancement. The sampling tools in direct contact with environmental media will be washed in laboratory -grade detergent and rinsed with distilled water before and between sampling intervals. Disposable sampling materials will be used while handling soil samples. New, disposable plastic liners will be used in the soil sampler for each sample interval. Civil & Environmental Consultants, Inc.