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General Cost Estimating Assumptions • Dewatering needed for sewer and water installation. • Fill required for all roadways. • Borrow material cost does not assume use of regional pond excavation. • Aggregate base cost does not assume use of City stockpile. Segment A-1 Assumptions • Removal of existing 42-inch storm sewer included in trunk storm sewer cost. • Sanitary assumed to extend to midpoint of last parcels serviced by sewer line. Segment A-2 Assumptions • Relocation of 18-inch trunk sanitary sewer into future Ramsey Parkway alignment included in trunk sanitary sewer cost. • Sanitary assumed to extend to midpoint of last parcels serviced by sewer line. Segment E Assumptions • 30-inch regional pond outlet pipe included in storm sewer cost. • Extension of sanitary sewer laterals to the right of way included in sanitary sewer cost. Additional Assumptions • No costs associated with construction of individual storm water ponds, as it is anticipated the regional pond will address all storm water runoff requirements. We assumed the region pond would be constructed incrementally, as individual parcels develop. The regional pond will be sized to address all impervious surfaces within the developable area including the public improvements and all individual site development within the study area. • Park Fill is the estimated cost to grade the proposed City park parcel, fill the site to an elevation equal to the adjacent streets, place 4 inches of topsoil and seed and mulch the entire site. The estimated project cost to fill the site, topsoil, seed, and hydromulch is approximately $231,000. Alternatives Analysis An alternate cost analysis was performed to determine the difference in cost if a bioretention basin was constructed along the median in Ramsey Parkway, in lieu of the bituminous trail currently being considered. The bio-retention basin is not required to meet water quality volume requirements, but instead to perform pre-treatment and create a native plantings and landscaping feature. It is estimated that creating a swale along the median with landscaping would result in a cost savings of approximately $10 per foot when compared to the installation of a 10-foot bituminous trail and sod. VIII. COST ALLOCATION ALTERNATIVES The costs, or a portion of the costs, of the improvements are typically allocated back to adjacent properties through the use of assessments, fees and other methods. The costs are typically allocated in a way that is equitable to the properties benefitting from the improvements. Public improvements that will become City owned and maintained are typically constructed through a public process, while secondary improvements are constructed by the property owner. For our analysis, we assumed the following items Prepared by: Bolton & Menk, Inc. COST ALLOCATION ALTERNATIVES Center Street Area Analysis I R16.114929 Page 10