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 2 March 16, 2018 Wilber Street (the Project Area). The Project proposes to redevelop the abandoned railroad line for use as a recreational public pathway, including construction of an approximately 10 to 12-foot wide paved walkway, light poles and other amenities. CEC understands that the environmental services requested are based on the findings of CEC's Phase I ESA performed in 2016 and updated in 2017, which was conducted as a preliminary assessment to identify the potential presence of hazardous materials within the Project Area. The findings of the Phase I ESA identified multiple recognized environmental concerns (RECs) with potential to impact the subsurface conditions of the Project Area. Following approval of the Phase I ESA findings by INDOT, it was determined that a Phase II ESA is required to further evaluate the RECs identified in the Phase I ESA which may pose a threat to worker safety or require waste handling. A conference call between representatives of UCE, INDOT and CEC on November 1, 2017, concluded that additional assessment was necessary to prepare a site -specific Phase II ESA work plan. CEC, in coordination with UCE, conducted the assessment of the identified RECs via a review of available documents found on the IDEM's Virtual File Cabinet (VFC) to better understand the nature and extent of known contamination and current status of the investigation and remediation efforts at the these facilities, along with their potential to adversely affect the Project Area as it relates to potential exposure risks during construction activities. CEC summarized the findings in the attached Work Plan spreadsheet, which, along with an accompanying proposed sampling locations sketch, was submitted to INDOT for review and approval prior to preparation of this proposal. INDOT approved CEC's site -specific Work Plan on February 15, 2018. 2.0 PURPOSE The purpose of our proposed services is to perform soil sampling and associated laboratory analyses to help understand existing Site conditions and, if needed, to support the preparation of a potential site -specific Soil Management Plan (SMP) for the area of the proposed trail construction activities. If encountered, groundwater samples will also be collected for analysis and used to support preparation of appropriate management strategies, if needed, that will be provided within the SMP in the event that groundwater is encountered during construction and excavation activities. 3.0 SCOPE OF SERVICES CEC will perform the following scope of services: 3.1 Task l -- Project Management & Work Plan Develo ment This task includes the project management services provided to -date, including consultation with UCE and INDOT personnel, review of historical records for surrounding sites identified as RECs Civil & Environmental Consultants, Inc.