4.7. SR 10-02-2017 - Laserfiche WebLink

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1�Hakanson 111Anderson August 29, 2017 Justin Femrite, City Engineer City of Elk River 13065 Orono Parkway Elk River, MN 55330 RE: 2017 Street Improvements Dear Mr. Femrite: Main Office: 3601 Thurston Avenue, Anoka, MN 55303 Phone: 763/427-5860 Fax: 763/427-0520 www.haa-inc.com r SENT VIA EMAIL: JFemrite(cr�,ElkRiverMN.gov We are pleased to continue to provide quality engineering, construction observation and construction staking services related to the 2017 Street Improvement Project for the City of Elk River. As discussed verbally, there have been a few items that have increased in scope making it necessary to request this consideration for an increase in the maximum not -to -exceed cost of our services. The most significant change to the scope of this project is the construction timeframe and resulting costs of construction observation and construction administration. At the time of our proposal, it was estimated that the construction timeframe would be 16 weeks total. We are now entering week 20 of construction and the project is projected to take approximately 5 additional weeks, for a total construction timeframe of 25 weeks. There were other smaller adjustments in scope as well, discussed in greater detail by project area as follows: Business Center Drive / Joplin Street / Orono Parkway Project Area At the time of our proposal, the construction method of this area was assumed to be a full depth reclamation and re -paving project with some curb replacement. Construction was anticipated to have a relatively quick timeframe (4 weeks). The construction process involved replacing the failed curb and gutter, removing the excess full depth reclamation material, and re -paving the bituminous courses. Instead, this project area increased in scope to a partial reconstruction. During the design phase, it was determined that the existing thickness of the pavement and aggregate base was not sufficient to meet pavement design thicknesses as required by Mn/DOT design standards based on the projected traffic over the next 20 years. Therefore, after reclaiming the bituminous pavement it was necessary to remove the entire thickness (9" - 10") of full depth reclamation material, then subcut the existing subgrade (4"- 6") then replace the full depth reclamation material to prepare for the bituminous pavement. This construction process increased the construction timeframe by approximately 6 weeks and slightly increased the design effort. It is estimated that this change in scope resulted in an increase in cost of approximately $32,000. At the time of the proposal reclaiming and paving of the bituminous trail on Joplin Street and Orono Parkway was not anticipated. While we agree that it was logical to include the trails in the project, the addition slightly increased the design effort as well as the construction timeframe. It is estimated that the addition of the trail resulted in an increase in cost of approximately $4,500. At the time of the proposal, drainage improvements were not anticipated on Orono Parkway. However, during the design phase it was discovered that improvements could be made to improve the safety and ride. Storm sewer was added at strategic locations which slightly increased the design effort as well as the construction timeframe. It is estimated that the addition of the drainage improvements resulted in an increase in cost of approximately $6,500.