CCP 11-12-2002 - Laserfiche WebLink

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I J!!i_"~,~_ I I I I I I Pavement Section II Discussion I I I I I I I , I , "".... ~ ~,~-,.....~"'~.,.~ -~- __'<I!l: ~ . City Engineer anticipates that the street will deterioratc at a relatively slow pace and should remain serviceable for several years to come, . The neighborhood feedback has been strongly against spending money to reconstmct this street both from the affectcd residents and the neighborhood at large, . The proposed water quality basin located in the Femwood Channel will not require the reeonstmction of Femwood Court however care will need to be taken by the Contractor in order to limit any damage to the street during construction activities, . No existing drainage problems on Fernwood Court, ? The City Engineer requests that the Council direct staff to either reconstruct the street fully, construct new curb and overlay or remove the street from the PMP schedule not to be reconsidered unless petitioned by the property owners, The proposed street pavement sections will be designed in accordance with MnDOT guidelines for flexible pavement design utilizing the soil R values measured from the geotechnical analysis. The geotechnical analysis was completed by American Engineering and Testing in 1999 and recommends that the use of a granular subbase be incorporated into the design of the proposed street pavements, The City standards include a 12 inch granular subbase, The sand subbase will provide enhanced pavement support, pavement subdrainage and frost protection necessary for the soils encountered in this area, The typical pavement cross section will include 4-5 inches of bituminous surfacing, 8-12 inches of Class 5 aggregate base and 12 inches of sand subbase, The sand subbase will be drained with 4 inch diameter PYC pelforated pipes connected to storm sewer catch basins, Final pavement sections will be determined as a part of the final design process based upon the soil borings and analysis of in place soils and traffic and traffic loads, Ingerson Road and Hamline Avenue (south) are designated as Municipal State Aid Streets and will be designed in conformance with State Aid guidelines. During the course of the project development, some residents questioned whether the sand subbase was necessary on the portion of Ingerson Road from Lexington A venue to Fernwood Street due to its slope, Although the significant slope of this section of roadway will shed surface water much more efficiently than the flatter roadways, the sand subbase will still add value to the pavement section through increased strength and frost resistance, Pavement consistency within an area is generally a desirable design attribute since different sections will react differently to weather and traffic thus typically creating a "speed bump" or depression at the location of interface, The cost of the sand subbase is approximately $20,00 per linear foot of roadway, 7