Laserfiche WebLink
<br />. <br /> <br />Mr. Pat Klaers <br />January 24, 1994 <br />Page Two <br /> <br />Currently, a 10-foot wide shoulder is in place south of the TH 10 and Oxford Avenue <br />intersection. A portion of this shoulder, approximately 90 feet in length, is concrete. The <br />remainder of the shoulder is bituminous surfaced. According to Mr. Ken Wasnie, the MnDOT <br />District 3 Materials Engineer, the existing shoulder is deficient in both section thickness and <br />width to accommodate a turn lane. Improvements would require removal and reconstruction <br />of the shoulder to facilitate a turn lane. <br /> <br />Proposed Improvements <br /> <br />Design standards for turn lane improvements along State roadways are established by MnDOT. <br />As shown by Exhibit 3, the turn lane requires a 14-foot wide surface measured from the edge <br />of the through lane to the face of curb. A concrete barrier curb is required along the length <br />of the turn lane. The pavement section determined by MnDOT for this turn lane is 3 inches <br />of bituminous surfacing and 4 inches of aggregate base on an acceptable subgrade. The total <br />length of the turn lane is required to be 480 feet, which includes 300 feet of surfacing for <br />vehicles to decelerate and turn, and 180 feet of transition taper to exit from the northbound <br />through lane. <br /> <br />. <br /> <br />According to Mr. Wasnie, MnDOT's preference for these improvements would be to remove <br />the existing concrete and bituminous portions of the shoulder and construct all improvements <br />with bituminous surfacing. A second and less attractive option of widening the existing <br />concrete section was discussed. However, the additional construction costs and difficulties <br />indicate that MnDOT's preferred option is also more cost effective. <br /> <br />Estimated Costs <br /> <br />The estimated construction and project costs for right turn lane improvements at Oxford Avenue <br />are provided below. The overhead costs have been estimated at 28 % of the construction cost <br />as detailed by the City's Assessment Manual. <br /> <br />Estimated Construction Cost <br />Administration, Engineering, Fiscal (28 %) <br />Estimated Total Project Cost <br /> <br />$19,600 <br />5.500 <br />$25,100 <br /> <br />The construction cost includes removal of the existing shoulder, excavation, placement of <br />aggregate base and bituminous surfacing, concrete curb, placement of fill material behind the <br />curb, sodding, striping, and traffic control during construction. <br /> <br />. <br /> <br />202-1004.dec <br />