08/11/2010 Council Packet (2) - Laserfiche WebLink

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Construction Estimate Lake Drive (CSAH 23)/Main Street (CSAH 14) Improvements City of Lino Lakes, Minnesota August 11, 2010 Page 2 • The proposed pavement section was based upon a typical section assumption provided by the County and consisted of 6 inches of bituminous pavement over 6 inches of class 5 aggregate base. A 1 -foot subcut that would be backfilled with select granular material was also included. • The proposed project was expected to create more than 1 acre of disturbed area and require a storm water permit from the Rice Creek Watershed District and the MPCA. In anticipation of potential water quality improvement needs, a storm water treatment pond has been assumed for the proposed project. • New storm water pipes were added to drain from the sections of new curb and gutter. The new pipes were assumed to connect into the existing system and drain into the proposed storm water treatment pond. This construction estimate is based on the above items and is considered preliminary. Preparation of final plans will be required to address all of the issues and to obtain a more accurate construction estimate. The total project cost is estimated to be $1,668,000, including contingencies and right -of -way acquisition. The following contingencies have been added to address other items necessary for construction of the proposed project: • 15% contingency to account for items that will not be quantified until construction plans have been created. • 20% contingency for engineering plan, specification, and bid package preparation. • 5% contingency for legal, fiscal, and administration duties, which does not include expenses associated with the bond. • 8% contingency for construction services and observation. The attached summary table shows the estimated construction costs followed by the right -of -way costs and contingencies. Itemized construction estimates are then attached for the proposed project. All unit prices and cost estimates reflect construction in year 2012.