CCP 01-31-1994 - Laserfiche WebLink

Home Browse Search

I ~ evaluation prior to subcutting deeper than the proposed 18-inches. The subgrade will then be replaced with granular borrow material to the same elevation as the existing subgrade. A granular equivalency of 14 inches of gravel is required for the existing native material in order to meet the 9-ton design standard. This would require approximately six inches of class five aggregate base and three inches of bituminous material. I The typical street cross-section is presented on Exhibit 6. The cross-section would meet the MnDOT design standard for an urban residential street, specifically a 9-ton roadway, 32-feet I in width. In addition to the street improvements, B6l8 concrete curb and gutter would be installed along all of these streets and four-inch perforated drain tile would be installed either I along the length of the streets in flat sections, or transversely on sloped sections to provide additional sub grade drainage. These drains would then be connected to the existing storm sewer catch basins to remove moisture from the street sections. I Concrete driveway aprons would be provided to match the new street grade and boulevards would be restored with topsoil and sod upon completion of the street construction. Utility I structures would also be adjusted to match the existing pavement surface upon completion of paving operations. I The costs associated with the reconstruction of these streets are presented in the cost tabulation section of this report. Approximate costs for the construction of each individual street are provided for the purpose of comparison. . Keithson Drive I The most feasible method of rehabilitating Keithson Drive would be the cold in-place recycling method. This method consists of the milling and pulverizing of the existing pavement which is then placed back on the roadway as additional base material. This base is I then graded and compacted, then overlaid with two inches of bituminous material. This would restore the street to its original design strength. The concrete curb and gutter would remain in place and driveways and boulevards would not be disturbed; therefore, reducing I construction costs. Sections of concrete curb and gutter totalling approximately l5D-200 linear feet will require replacement or adjustment due to settlement as well. A typical street cross-section is presented on Exhibit 6. I Ramsey County continues to utilize this method of roadway rehabilitation as it provides more I benefit than an overlay at a cost lower than that of reconstruction. The County has been very aggressive in this type of construction and continues to be encouraged with the results. The cost of cold in-place recycling of Keithson Drive is presented in the cost tabulation section of I this report. I I' 13 I