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Mounds View Stormwater Pond Assessment 4 RECOMMENDATIONS July 2023 4.1.2 DREDGING COST ESTIMATES For ponds identified with the potential for dredging within the next 10 years (high or medium priority), planning -level sediment removal costs were developed for the removal of accumulated sediments. The cost estimates are based on 2023 costs, experience with basin excavations and construction, and recently awarded projects. Construction costs were estimated for each pond based on the following factors. Mobilization and demobilization • Site preparation and access • Temporary dewatering • Traffic control • Erosion control • Muck excavation and offsite disposal • Minor storm sewer and structural adjustments Engineering services (15% of total or minimum $10,000) • Testing Services (5% of total or minimum $5,000) • 30% contingency • 6% inflation trend based on target year Table 4.2 outlines those quantities and planning level cost estimates for dredging. These costs do not include wetland mitigation, major structural work, land/easement acquisition, or construction observation. Costs for each pond were calculated as a separate project. It would be beneficial to combine adjacent ponds to save money on all bid items as the project becomes bigger and more economical. The detailed Opinion of Probable Construction Cost conceptual -level estimates for each basin identified in Table 4.2 can be found in Appendix C. Table 4.2 Planning Level Dredging Cost Estimates Basin Name AA-1.1121 -•Target-•• •• 98.5 Dredging Year 2024 • Priority H Proposed 715 -• Total $192,400 AA-1.P2 48.6 2024 H 692 $194,900 EW-11.P1 52.4 2025 H 871 $244,000 EW-11.P3 60.1 2025 H 84 $101,800 SC-2.1121 44.5 2026 H 291 $146,900 SC-2.P2 50.5 2026 H 299 $149,500 GF-4.P2 83.6 2027 H 723 $244,000 SC-4.P3 40.6 2028 M 94 $148,900 22