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 5 March 16, 2018 sampling method involves temporary piezometers, formal well development is not proposed. As such, the obtained samples may exhibit greater turbidity that could result in biased high metals concentrations as compared to results if conventional monitoring well installation, development and sampling methods were used. Therefore, CEC also proposes the collection of groundwater samples in unpreserved containers to be filtered by the laboratory prior to analysis to yield dissolved lead levels. • For quality assurance/quality control (QA/QC) measures, soil samples will be accompanied by a laboratory -provided trip blank for submittal and analysis of VOCs. • Soil samples will be submitted to Pace Analytical Services of Indianapolis, Indiana, for analysis under standard turnaround protocols (10 business days). If an expedited turnaround is desired, additional laboratory fees will apply. • Following sample collection, the borings will be abandoned by backfilling with native soil and bentonite. • Due to the small diameter and limited depth of the proposed soil borings, it is anticipated that investigative -derived waste accumulated during drilling activities will be minimal. Therefore, CEC proposes backfilling the boreholes with the soil cuttings. 3.4 Task 3 — lac pc)rting After the field activities and receipt of laboratory results, CEC will prepare a draft report summarizing our environmental findings. The report will include available background information, the results of laboratory testing, a discussion relative to the presence of detected constituents, conclusions, and if required, recommendations for further activities. Maps, data tables and attachments to support our assessment will be included in the report. The levels of detected constituents will be compared to IDEM's updated Remediation Closure Guide (RCG) screening levels to assess potential regulatory and/or handling/disposal implications. In the event constituents are detected in soil exceeding the screening levels for the direct contact pathway, it is anticipated that excavation spoils meeting this criteria will need to be segregated and transported off site for proper disposal at an appropriate landfill facility. The draft report will be provided to UCE in PDF format via email. Upon receipt of mutually - acceptable comments, the report will be issued to UCE and INDOT in final electronic PDF format. If requested, hard copies will be prepared and invoiced on a time and materials basis in accordance with the proposed fees presented in Section 4.0 of this proposal. Civil & Environmental Consultants, Inc..