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7550 MERIDIAN CIR N, SUITE 120 | MAPLE GROVE, MN 55369 PAGE 2 OF 8 <br />UPDATED ESTIMATED PROJECT COST <br />HEI prepared a technical memorandum on September 30th, 2019, that evaluated the feasibility of <br />replacing the open channel ditch on RCD 4 with stormsewer piping and included an opinion of <br />probable cost for the work. This memorandum, which conservatively assumed the stormsewer would <br />consist of 84-inch reinforced concrete pipe (RCP), estimated the proposed project cost to be <br />$3,652,188. Following the publication of this memorandum, City staff completed research on <br />alternative pipe material options and received estimates for DuroMaxx, a proprietary steel-reinforced <br />plastic product that was less expensive than the previous estimate. The cost estimate has now been <br />updated to assume the use of steel-reinforced plastic in lieu of RCP, at a cost of $550 per lineal foot. <br />Additionally, based on input from City staff, redevelopment projects adjacent to the ditch appear likely <br />to generate excess fill that may be used to backfill the pipe rather than importing fill. The cost for <br />backfill has been adjusted to assume that borrow material from the adjacent redevelopment parcels <br />during their planned construction will be available. Finally, additional detail has been provided for <br />erosion and sediment control items. Table 1 below displays the updated project cost estimate. <br />Table 1.Updated Project Cost Estimate <br />Item Unit Unit cost Quantity Cost <br />Mobilization LS $100,000 1 $100,000 <br />84" Steel-Reinforced Plastic LF $550 2,425 $1,333,750 <br />Fill from Adjacent Site CY $3 46,200 $138,600 <br />Intakes EA $5,000 6 $30,000 <br />Manholes EA $50,000 4 $200,000 <br />Connect to Existing Lateral EA $5,000 6 $30,000 <br />Seeding and Mulch (P) AC $2,077 5.1 $10,593 <br />Silt Fence, Type A LF $5 5,000 $25,000 <br />Tree Clearing and Chipping (P) AC $8,646 5.1 $44,095 <br />Construction Cost $1,912,037 <br />Contingency (25%) $478,009 <br />Engineering (20%)$382,407 <br />Total Cost $2,772,454 <br />LIFE CYCLE <br />For long-term cost projection considerations for this analysis, the life cycle of steel-reinforced plastic <br />pipe can be considered to be 100-years.