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<br />~ <br />SEH <br /> <br />MEMORANDUM <br /> <br />TO: <br /> <br />Mayor and City Council of Arden Hills <br /> <br />FROM: <br /> <br />Mark Benson <br /> <br />DATE: <br /> <br />April 9, 2008 <br /> <br />RE: <br /> <br />Evaluation of Altemative Highway 10 alignments <br />SEHNo.101752 <br /> <br />Scope of Work <br />In response to the city council position paper dated March 31, 2008, SEH has been requested to evaluate <br />altemative alignments for Highway 10 as part of preserving full access for residents and business between <br />Highway 10 and County Road 96 through development of an interchange that includes access to TCAAP <br />from Highway 10. This was requested as part of the City Project - Design Constraint # 4 within the <br />position paper. <br /> <br />The City requested the following be reviewed as part of the evaluation: costs of realignment options, <br />beginning and tenninus of realignment, impacts to property further south of County Road 96 and quality <br />of tile existing road. The goal of this study was to dctcnnine the cost implications of moving the roadway <br />east to minimize impacts to the Arden Manor area. <br /> <br />Alternatives <br />\Vorking with city staff, a range of four altematives were developed and analyzed (see attached exhibits): <br /> <br />Altemative I - Utilize the existing Highway 10 alignment. This is the base altemative for comparison <br />purposes. The total length ofconstruetion along Highway 10 is 4200 feet (0.8 miles). <br /> <br />Altemative 2 -- Shift eastbound Highway 10 lanes 23 feet east within the median area and use an urban <br />road section (ditch is replaced with median barrier and curbs) to reduce impacts. Highway 10 requires <br />full reconstruction to accommodate urban section. The totallength of constluction along Highway 10 is <br />5400 feet (1.02 miles). <br /> <br />Altcmativc 3 .- Shin all of Highway 10 to the east 41 feet within the existing right-of-way and use an <br />urban section to reduee impacts. The total length of construction along Highway 10 is 6000 feet (1.14 <br />miles). <br /> <br />Altemative 4 - Using the same rural Highway 10 centerline as Alternative I, shift all of Highway 10 east <br />onto TCAAP property 217 feet so that all impaets to the land uses west of Highway 10 would be avoided. <br />The totallcngth ofconstruetion along Highway 10 is 7800 feet (1.48 miles). <br /> <br />An important observation was made when reviewing the altematives, shifting Highway 10 east affects the <br />County Road 96 grade separation project (CR 96 Project) which is antieipated to start design May 2008. <br />Altemative I can be eonstructed independent of the CR 96 Projeet. However. if Alternative 2, 3 or 4 is <br />seleeted, the City will need to coordinate closely with Ramsey County as the location of the grade <br />separation bridges would change depending on the alignment of Highway 10. This would require the two <br />projects to become tied together and occur in conjunction with each other. <br /> <br />Short Elliott Hendrickson Inc., 3535 Vadnais Center Drive. SI. Paul, MN 55110.5196 <br />SEH is an equal opportunity employer I www.sehinc,com ! 651,490.2000 I 800.325.2055 I 651,490.2150 fax <br />