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ROADWAY l�M�PROVE ENT' COST' EST'l�M�AT'ES
<br />Based on the concept sketches,, costs, were developed for each improvement. All cost estimates,
<br />include construction cost, design engineering, contract administration, construction engineering,
<br />right-of-way and contingency costs,. It should be noted that the concept cost estimates, contained
<br />in this document do not represent detailed design estimates,, nor do they include all incidental
<br />items, that may be encountered. However, contingency costs, are included to account for these
<br />types, of incidentals, and unknowns,. In addition, the estimates, contained herein were developed
<br />with a conservative approach on pavement thickness, s,idewalk/trail width, etc. and all quantities,
<br />were rounded up to ensure this conservative approach.
<br />The following proces,s,es, and as,s,umptions, were used to determine the cost estimates,-.
<br />Aerial photography was, used to determine the existing curb lines,, number and length of
<br />lanes,, and any existing structures, that could be used as a guide to determine the
<br />placement of the recommended improvements,,
<br />Roadway improvements, were drawn on top of the aerial photography to determine the
<br />removal quantities, and new material quantities, needed to complete the improvement.
<br />The existing roadway width and right-of-way (as, well as, parcel demarcation) was cros,s,
<br />referenced against graphical information system (GI, data provided by the City of
<br />Roseville.
<br />Right-of-way quantities, were based on property right-of-way lines, provided by the City.
<br />Amounts, stated were overtaken by the respective improvement.
<br />Drainage quantity, cost, and structure type are affected by the specific improvement. The
<br />drainage removal quantities, were based on linear feet of existing curb to be removed. It
<br />was, assumed that if the curb is removed due to widening then the drainage structures, and
<br />pipe also need to be removed. The proposed drainage costs, were based on 3 -percent of
<br />total paving and grading cost.
<br />All quantities, are based on major construction components,. Therefore, a construction
<br />contingency cost of 10-percent was, added to the total construction cost to account for all
<br />minor items,.
<br />An engineering and administration cost of 25-percent of total construction cost was
<br />typically added to each improvement.
<br />• Cost estimation item prices, are based on average bid prices, for Mn/DOT year 2007.
<br />• A communication infrastructure cost was, included in the estimate (i.e., fiber optic cable).
<br />Quantity assumptions include:
<br />o All median removals, are concrete walk, unles,s, aerial photography shows
<br />trees /shrubs.
<br />o All pavements, are bituminous, (4" wear and 6" non-wear course mix), except
<br />where the existing pavement is concrete (10" depth assumed for new or
<br />replacement pavement).
<br />City of Roseville Vain. Lakes AUAR Area
<br />February 2008, Infrastructure Improvements
<br />Page 4
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