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Name: Todd A. Blomstrom <br />Date: October 8, 2020 <br />Page: 5 <br /> <br /> <br />work for Lift Station 10 because of the minimal flows that it receives: calculated to be less than <br />three gallons per minute on average and less than five gallons per minute during peak periods. <br />Due to the pump design and the need to maintain a minimum flow vel ocity in the force main, a <br />new 2-inch force main would have to be installed as part of Option 3, probably using a direct <br />drilling method. Table 5 summarizes the costs associated with Option 3. <br /> <br /> <br />Table 5 - Option 3 Cost Estimates <br />Item Cost <br />Mobilization $15,000 <br />Construction and Utility Allowance $10,000 <br />Grinder Station $30,000 <br />Piping & Valves $3,000 <br />2" Force Main $45,000 <br />Modifications to Outfall MH $3,000 <br />Electrical $10,000 <br />Panel Pad $55,000 <br />Demolition/Removal $15,000 <br />Abandon existing 4" Force Main $10,000 <br />Bypass Pumping $3,000 <br />Site Work (Grading, Drive, Seeding, etc.) $12,000 <br />Construction Subtotal $211,000 <br />Contingencies (20%) $42,000 <br />Construction Total $253,000 <br /> <br /> <br />Alternative Analysis <br />The goal of this project is to rehabilitate Lift Station 10, with the secondary goal of preventing <br />wastewater from backing up the influent gravity sewer pipe and into upstream manholes. All <br />three option address this issue with varying approaches and costs. Table 6, below, summarizes <br />the advantages and disadvantages of each option. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />