Motion to Finalize Scope of Proposed Work Fairview/Grand Sewer Project

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a permit issued through the District. The permit would require the City to pretreat the storm water,meter the flow,and pay a fee based on the volume of water discharged. Since this is not an IEPA directive,the District's position could be legally challenged if desired. New Route Proposed for Alternate 3 Following the October 2022 discussion with the City Council,Public Works staff met with AECOM to review the alternatives and revisit options to reduce costs. The original storm sewer route for this alternative crossed Fairview Avenue and went behind the Fairview Shopping Center,between the building and the railroad tracks before crossing Rt. 36 and through Fairview Park. Using Fairview Avenue was originally determined to be too expensive and opposed by IDOT. After discussing the alternative in greater detail with IDOT,they were supportive of this approach and there appeared to be a possible route to the south that would avoid other utilities. This alternate route reduced the original Alternate 3 estimate by around$500,000 and is the recommended route given in Table 2 below. Alternative Cost Comparison In Table 1,AECOM briefly tabulated the additional costs involved with using the detention pond option. This includes SDD fees and maintenance: Table 1:Option Sa Maintenance Cost(over 20 years In 2023 dollars) Based on SDD Charge of$1.7 per 100 cu ft $ 1,490,000 Fee to SDD (avg.40.37" precip per year,Avg.C factor of .545 and 54.89 acres) $ 269,000 Clearing debris after storms 12 times per year with 2 people for 4 hours Detention pond site $ 134,000 maintenance 16 times per year with 1 person for 3 hours $ 150,000 Clearing sediment from basin Once every 10 years $ 2,043,000 Total Table 2 shows the modified project estimates including: inflation,20-year maintenance for Alternative 5a,and using an alternate route for the complete separation recommended in Alternative 3. Table 2:Revised Alternative Comparison Alternative 3 Estimate(total separation crossing Rt.36 behind Fairview Shopping Center) $ 17,000,000 Alternative 5a Estimate(Separation with detention pond and return to sewer) $ 14,000,000 Alternative Sa Estimate(with 20 yr O&M&SDD fee from Table 1 included) $ 16,043,000 Alternative 3 Estimate Modified(using Fairview $ 16,500,000 Avenue) Page 12