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f,�A SCO Exhibit A-6 <br /> AECOM 312 938 0300 tel <br /> 303 East Wacker Drive 312 373 6800 fax <br /> Suite 1400 <br /> Chicago,IL 60601 <br /> www.aecom.com <br /> Task 7: BASINS 5/6 HYDRAULIC AND HYDROLOGIC MODELING UPDATE (ALLOWANCE) <br /> The combined sewer system in Basins 5/6 was originally modeled as a part of the Sanitary <br /> Collection System Sewer Alternatives Analysis (SCSAA) completed by AECOM and submitted on <br /> November 30, 2017. The results of that work indicated that significant blockages existed within the <br /> combined sewer system, and as a result, the system was subsequently cleaned in early 2018. Flow <br /> monitoring was then performed after the cleaning, but the model was never updated. <br /> If the City wishes, the combined sewer model can be updated, calibrated, and validated with the <br /> latest flow monitoring data that was performed by ADS in 2018 and provided to AECOM in March, <br /> 2021. <br /> The allowance will include hours for the following two (2) alternatives: <br /> 1. Complete sewer separation <br /> 2. Partial sewer separation <br /> The model will be recalibrated, and Chapter 5 of the November 30, 2017 SCSAA will be updated. <br /> All previous alternatives for Basins 5/6 will be retained in the SCSAA, and additional alternatives <br /> (7a and 7b) for complete and partial sewer separation will be included based on the results of this <br /> study. <br /> eliverables: j <br /> • SCSAA Update <br /> Task 8: ALLOWANCE <br /> This task is for a general project allowance (or contingency). For example, the EPA may have <br /> comments on the report that need to be addressed through additional modeling, field work, etc. or <br /> the City may request additional work that is not included in the current scope of work. This <br /> allowance will be used only when approved by the City. <br /> Deliverables: <br /> • TBD <br /> ASSUMPTIONS <br /> 1. The following items are not included in our scope of work: <br /> a. Private property inspections <br /> b. Roof drain inspections <br /> c. Topographic survey <br /> d. Preparing legal descriptions, easement exhibits, and obtaining easements <br /> e. Dye testing and/or dye water flooding <br /> 2. We have included the following meetings: one (1) kick-off meeting; two (2) <br /> progress/workshop meetings, three (3) meetings with SDD, two (2) meetings with IDOT, one <br /> (1) public meeting with local residents, and one (1) review meeting for the Draft Preliminary <br /> Design Report. <br /> 3. The contributing area just west of Basin 5 will be included in all of the tasks listed in this <br /> scope of work. <br /> Proposal Fee <br /> The not-to-exceed fee for this work$199,146 to be paid on a time and materials basis. A task-by-task <br /> breakdown of the fee is included herewith as Attachment 2. <br /> 6 <br />