Agenda - Council - 10/26/2021 - Laserfiche WebLink

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4.0 DISCUSSION AND RECOMMENDATIONS 4.1 Proposed Construction This project will include improving the following streets within the Autumn Height area within the City of Ramsey; 167th Lane NW, 168th Lane NW, Nutria Street NW,168th Avenue NW, Rabbit Street NW and 169th Avenue NW. Based correspondence with the City of Ramsey we understand that street improvements could include completely removing and replacing the existing pavements or a full -depth reclamation. We further understand that no sanitary sewer or watermain utilities will be installed as part of this project. However, culvert and/or storm sewer installation or replacement will likely be included in the project. We anticipate that site grading will consist of earthwork necessary for roadway reconstruction and we do not anticipate any significant changes in the roadway alignment or roadway grades. Cuts or fills involving permanent grade change, if any, are assumed to be less than 1 feet. Invert elevations or pipe burial depths for any storm sewer and/or culvert installation are anticipated to be on the order of 5 feet. We were not provided any information regarding traffic volumes such as Average Annual Daily Traffic (AADT) counts or vehicle distribution for the roadways. We assumed these roadways will be utilized mainly by automobiles, light trucks and school buses with weekly use by heavier vehicles such as garbage trucks and UPS or FedEx type delivery vehicles. Based on the number of homes along the roadways we estimate the pavement will be subjected to less than 50,000 Equivalent Single Axle Loads (EASL's) over a design life of 20 years. The ESAL's estimated above have not been adjusted for any future growth. Changes in the nature, design, or location of all or parts of this project may occur. Likewise, if the proposed traffic volumes exceed these values we should be informed. Additional analyses and revised recommendations may be necessary. 4.2 Discussion Pavements Based on the maintenance history provided it appears that the pavements were initially constructed in the late 1970's thru the late 1980's. A maintenance program including seal coating and bituminous overlays occurred in the 1980's thru to about 2004. The roadways appear to be in excess of 30 years old but given their age they appear to have generally performed as designed and based on an assumed 20-year service life, the pavements have likely significantly exceeded their design life. We observed longitudinal and transvers cracks with some "alligator" or fatigue cracking of the pavement surfaces. The cracking observed could be the result of a combination of factors including; inadequate pavement thickness, pavement age and possibly frost action/frost heave. Longitudinal cracking are cracks parallel to the pavement centerline or laydown direction. These can be caused by poor joint construction, reflective cracking from an underlying layer, fatigue cracking or top -down cracking resulting from the age of the pavement or due to expansion and contraction of the pavement surface or increased loads/traffic on the pavements. Transverse 8