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<br /> ARDEN HILLS CITY COUNCIL - NOVEMBER 9, 1998 14 <br /> . Mr. Post stated the Council is being requested to consider three alternatives with large <br /> variations. Alternative A would essentially rebllild the existing two lane road with a curb and <br /> gutter at a cost of$1.2 million dollars. Alternative B wOllld build a two lane divided road with a <br /> raised median and turn lanes at a cost of almost $2 million dollars. Alternative D would build a <br /> two lane, llndivided road with a cenler turn lane at a cost ofSl.5 million dollars. A central issue <br /> in Council's consideration of Alternative B is a costlbenefit discussion regarding the $428,375 <br /> incremental cost of Alternative B over Alternative D. <br /> Mr. Post advised Ihe City Engineer recommends that Council opt for Alternative D. Staff <br /> concurs with this recommendation. <br /> Mr. Brown presented overhead slides of the three alternatives and gave a detailed description of <br /> each. <br /> With regard to the soil testing and cost differential, Mr. Brown stated Staff had directed him to <br /> review Alternative B to ensure, with the new soil information, Ihe numbers are still accurate. <br /> The original Alternative B had a cost differential of approximately $400,000. Based on the soil <br /> information received last week, the soil is not bad enough to warrant removal. Sand and rock <br /> may need to be added to provide 10 required roadway. With this new infonnation, the cost <br /> differential will be closer to $300,000. <br /> Mr. Brown slaled, based on the public request, the sidewalk was added back into Alternative B <br /> . and added to Alternative D. The cost of the sidewalk would be approximately $40,000. Mayor <br /> Probst asked if the sidewalk alternative is less expensive than a bituminous trail. Mr. Brown <br /> explained that the bituminous trail would be approximately $] 0,000 less expensive. However, <br /> the residents had expressed a preference for a sidewalk due to aesthetic issues. <br /> Mr. Brown stated, with regard to the road geometry of Alternative D, there are] 4 foot lanes <br /> going north and south with a 16 foot center lane. The center lane could be 14 feet however, a 16 <br /> foot center lane will allow for large truck turning and Staff believes the extra two feet would be <br /> appropriate. In addition to the road improvements, a trunk water main and storm sewer will be <br /> constructed. <br /> Mr. Brown indicated Ihat the proj ect will be built in two, possibly three phases, working east to <br /> west to provide the mosl continuous access for the businesses along the road. Having three <br /> phases will allow the work zone and traffic to be spread apart for safety purposes. <br /> Mayor Probst asked what the lane width is for Alternative B. Mr. Brown explained the lane <br /> width is 16 feet with 13 feet of black top and one and one-hal f foot of gutter. Although it is <br /> considered adequate, Staff proposes that the width may be adjusted since it is on the tight side for <br /> truck traffic. Proposed with this alternative is a 18 foot center median. <br /> Mayor Probst indicated that the reason he asked the question is he is having a difficult time <br /> understanding the cost difference between Alternatives Band D. Mr. Brown explained that two <br /> . items went up in the cost estimate, the common excavation of the hill with the five-foot raise in <br /> elevation, and the relaining wall. With Alternative B there is more overall pavement at the <br /> intersections because of the wider widlh. Although the base of the road would be excavated, the <br /> final blacktop number is a little under Alternative D. For Alternative D the blacktop is estimated <br /> at 1500 tons per course and 1300 tons per course for Alternative B. There is some savings on the <br />