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Exhibit A1 <br />Additional Engineering Services for Randolph-Sampson Retention Treatment Basin <br />Introduction <br />This document defines the scope of additional engineering services for the Randolph- <br />Sampson Retention Treatment Basin (RTB) project to be provided under this Amendment <br />No. 1. It details tasks involving Preliminary Design Phase and Final Design Phase. The <br />amendment covers activities through Preliminary Design Phase and 60% design <br />completion and project delivery planning of the process mechanical and site/civil <br />disciplines. <br />Scope of Services <br />Task 1 - Preliminary Design Phase <br />Subtask 1.1 – Site Investigation <br />Preliminary Design site investigations aim to further define conditions impacting design <br />and permitting based on findings from the previously authorized activities. This includes <br />site alternatives analysis, additional topographic, utility, property surveys, a Phase IA <br />archaeological reconnaissance to support funding e.orts, a Letter of Map Revision (LOMR) <br />application, a Phase II Environmental Site Assessment (ESA), a detailed design <br />geotechnical investigation, and field visits to Cincinnati and Detroit RTB facilities. <br />The archaeological survey involves shovel test units (STUs) at 15-meter intervals due to <br />anticipated low surface visibility, with a report expected to find no archaeological sites. <br />A LOMR application is planned due to the site's location in a FEMA Zone A flood hazard <br />area. The Phase II ESA will test soil, groundwater, and soil gas for contamination using <br />eleven boreholes with specific analyses for volatile organic compounds, metals, and other <br />contaminants. Sampling and laboratory analysis will follow USEPA methods, with a report <br />summarizing field data, lab results, and comparisons to Indiana standards. <br />A detailed design geotechnical investigation will include seven test borings up to 75 feet <br />deep, soil sampling, installation of groundwater monitoring wells and various laboratory <br />tests to inform foundation and excavation design. Geotechnical reports will provide <br />baseline conditions and design bases including soil parameters, groundwater control, and <br />construction considerations. <br />Field visits to Cincinnati and Detroit RTB facilities are also planned to gather insights for the <br />project.