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<br />Evaluation of Alternative Highway 10 alignments <br />April 9, 2008 <br />Page 2 <br /> <br />Assumptions <br />In order to ensure consistent comparisons between the alternatives, several assumptions were used: <br /> <br />J. The interchange type, size and location along Highway 10 was based on the February 4, 2008 <br />concept. <br />2. The approximate construction/right-of-way limits were based on the assumption that graded <br />slopes would be used on the outside of the roadways, not retaining walls. However, retaining <br />walls were used bet\veen the mainline and ramp areas to accommodate the compressed roadway <br />section. <br />3. All roadways that are colored on the concept plan exhibits were included in the cost estimates. <br />4. The Highway 10 bridges over Highway 96 were included in the estimates since Alternative 2,3 <br />and 4 all impact their size and location. <br />5. Mn/DOTs L WD (length, width. depth methodology) cost estimating tool was used to develop <br />the construction cost estimates (2007 dollars). <br />6. Highway 10, under Alternative I, was not considered reconstructed in the areas where the <br />elevation of the road was not changed. <br />7. The costs for right-of-way acquisition were developed by Stacie K vilvang of Ehlers and <br />Associates using current market valuations. <br />8. The groundwater treatment system wells were considered impacted if they fell within the <br />roadway reconstruction area. The degree to which the well system is impacted is also dependent <br />on the location of Highway 10. If Highway 10 is located over piping system. it would likely <br />result in the relocation of the piping system to allow for future access and repairs as needed. <br /> <br />Findings <br /> <br />The study findings have been summarized on two tables. Table I is an overall comparison summary of <br />the key differences between the four alternatives. Table 2 is feasibility study cost comparison showing <br />total costs for right-of-way acquisition and construction. <br /> <br />In summary, the overall project costs (construction and right-of-way) increase significantly as you move <br />Highway 10 east to minimize impacts to Arden Manor. <br /> <br />mdb <br /> <br />Attachments <br />. Altematives I - 4 <br />. Table I Comparison Summary <br />. Table 2 Cost Comparison <br /> <br />c: Stacie Kvilvang <br />Kris Giga <br />Gen Mclilton <br /> <br />~:pl 'J)~,\),lOJ 75~fC;l\il1i1ily '<"j"nJ\ifh\\'JY 10 JCJ-,ibiliIY mCI\\i!IJndum !;n~1 (~I.09.IlS.d;,.: <br />