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CONSULTING ENGINEERS <br /> Maier Stewart Associates Inc. <br /> September 3, 1992 <br /> File: 330 -000 -00 <br /> Ms. Susan Hoyt <br /> Administrator <br /> City of Falcon Heights <br /> 2077 Larpenteur Avenue West <br /> Falcon Heights, MN 55113 <br /> RE: CITY ALLEY RECONSTRUCTION <br /> Dear Ms. Hoyt: <br /> As requested, we have reviewed the existing condition of various alleyways located in the <br /> Northome Subdivision in the City of Falcon Heights. Most of the alleys in the area have <br /> extensive alligator cracking and pavement rutting and heaving. Given the existing conditions <br /> of the alleys, options for repair or reconstruction were explored. <br /> Given the existing conditions of the alleys we reviewed, it was determined that an overlay of the <br /> existing bituminous was not an option. An overlay will not repair the pavement heaving and <br /> will most likely result in reflective cracking, since the existing surfacing lacks structural <br /> strength. Since an overlay is not feasible, two other options were explored. <br /> The first option was to utilize cold in -place recycling (C.I.R.) and repaving with new material. <br /> This option was determined to be unsuitable for two reasons. First, the method does not allow <br /> the existing grade and finished elevations to be manipulated easily. Since many of the driveways <br /> adjacent to the alleyways have minimum slope to the alley, the C.I.R. option would result in <br /> drainage problems. Secondly, the C.I.R. option, which has a life expectancy of 10-15 years, <br /> has a higher cost effective annual cost than total reconstruction, which has a higher (20-25 year) <br /> life expectancy. <br /> The second option analyzed is the reconstruction of the alleyways to a 9 -ton section in <br /> accordance with MnDOT design criteria. The 9 -ton design strength is needed due to the heavy <br /> vehicles which need to use the alleys, such as garbage trucks, delivery vehicles, and snow <br /> plows. The section would consist of 8 -10 inches of gravel base with approximately 3 -1/2 inches <br /> of bituminous surfacing. Due to the cost effectiveness of this option and the ability to adjust <br /> grade, this is the recommended alternative. <br /> 1959 SLOAN PLACE, SUITE 200, St PAUL, MINNESOTA 55117 612- 774 -6021 <br /> 9800 SHELARD PARKWAY, SUITE 102, MINNEAPOLIS, MINNESOTA 55441 612- 546-0432 Equal Opportunity Employer <br />