Agenda - Public Works Committee - 02/21/2023

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The total for Municipal Plaza Improvements is estimated at $4,091,000. Costs and improvements are based on 2018 Cite Cost Estimating effort, adjusted for 2023 pricing. Additionally, an analysis was completed focused on stormwater, stormwater reuse, and irrigation alternatives. Current stormwater reuse project costs are estimated at $2,285,000. The analysis memorandum dated June 25. 2019, is in Appendix F for reference. General Cost Estimating Assumptions • Dewatering will be required for sewer and water installation. • Fill will be required for all roadways, with exception of Zeolite Street. • Aggregate base cost does not assume use of City stockpile. • Costs associated with creating the bioretention basin are included in the storm utility portions of Ramsey Parkway (Segments A-1 and A-2). Segment A Assumptions • Removal of existing 42-inch storm sewer included in trunk storm sewer cost. A portion was removed with the Affinity at Ramsey housing project. • Sanitary sewer is assumed to extend to midpoint of last parcels serviced by sewer line. • Includes an allotment for (2) 6 ft wide sidewalks along the roadway boulevard areas. • Costs for the median include restoration and plantings. • 8-inch sanitary sewer is assumed to extend to midpoint of last parcels serviced by sewer line. Segment B-2 Assumptions • Realignment of Center Street as shown in the COR Framework Plan included in the project cost. o The cost for B-2 could be eliminated from the project if the existing roadway were to remain in place. Segment E Assumptions • 30-inch regional pond outlet pipe included in trunk storm sewer cost. • Extension of sanitary sewer laterals to the right of way included in sanitary sewer cost. Segments H & I Assumptions • 8-inch sanitary sewer is assumed to extend to midpoint of last parcels serviced by sewer line. Grading Assumptions • Wetland Mitigation will be completed via purchasing wetland credits. Credit costs are continually modified and subject to change. Wetland credits must be purchased at a ratio of twice the acreage of impact. • Swell factor of excavated material is estimated at 10%. • Shrinkage factor of installed/compacted material is estimated at 25%. • Borrow material cost assumes use of regional pond excavation. Additional import material will be required if excavation material is depleted. Preliminary calculations indicate borrow material will not be required, however it will be dependent on individual site plans. • Trees will be replaced in accordance with City ordinances. Additional Assumptions • No costs associated with construction of individual storm water ponds are included, as it is anticipated the regional pond will address all storm water runoff requirements. The regional pond Prepared by: Bolton & Menk, Inc. The COR Analysis I OR1.129128 COST ANALYSIS Page 16