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7550 MERIDIAN CIR N, SUITE 120 | MAPLE GROVE, MN 55369 PAGE 4 OF 8 Table 2.Repair Cost Estimate Item Unit Unit cost Quantity Cost Mobilization LS $46,203 1 $46,203 Traffic Control LS $5,944 1 $5,944 RCP side inlets LF $329 100 $32,900 RCP Apron EA $2,590 6 $15,540 SWPPP Documentation and Reporting LS $2,422 1 $ 2,422 Seeding and Mulch (P)AC $2,077 5.1 $10,593 Silt Fence, Type PA LF $5 5,000 $25,000 Erosion Control Blanket SY $3 23,067 $69,201 Tree Clearing and Chipping (P) AC $8,646 5.1 $44,095 Excavation of Existing Trench (P)CY $10 1,400 $14,000 Haul and Disposal of Dredge Mgmt. Level 3 (P) CY $35 1,400 $49,000 Construction Cost $314,897 Contingency (25%)$78,724 Engineering Cost (20%)$62,979 Total Cost $456,601 The estimated costs displayed in Table 2 are based previous public drainage system repairs completed by the RCWD. The RCWD also regularly inspects and completes routine maintenance along public drainage systems. Currently, RCWD spends approximately $2,000 per mile of ditch across all systems annually in general inspection and maintenance activity. These activities include mowing, clearing, and grubbing the ditch right-of-way (ROW). The project area includes an approximate 0.5 mile of open channel ditch, therefore annual maintenance costs are estimated at $1,000. By installing the pipe, the project can eliminate these repair and maintenance costs. If the proposed project does not occur, the RCWD will complete a major repair along the current open channel within the next 5-10 years. Once major repairs are completed, annual maintenance costs can be expected to be higher for the 5 years immediately following the repair project. The higher costs of maintenance are due to the disturbed ditch banks and their need to stabilize. It is estimated that the increased cost will be $5,000 annually for the first 5 years of maintenance after major repairs have been conducted, totaling $25,000. Per RCWD policy, inspection and maintenance of public drainage systems is funded via the general tax levy (ad valorem). Thus, avoidance of inspection and maintenance cost is a benefit to the RCWD. DISTRICT FACILITY MANAGEMENT (WATER QUALITY) COST AVOIDANCE Open channels with steep side slopes that are not armored are highly susceptible to erosion and bank failures as evidenced by bank sloughing and blow-outs along this portion of RCD 4 in recent years. In severe cases, bank failures can create ongoing maintenance needs as well as damage