Agenda - Public Works Committee - 09/18/2012

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Public Works Committee 5. 8. Meeting Date: 09/18/2012 By: Shane Nelson, Engineering/Public Works Title: Sunwood Drive Project - Supplemental Agreement #1, Change Order #2 and Connexus Relocation Charges Background: Supplemental Agreement #1 The City Council previously approved the construction contract for City Project 12-20. This supplemental agreement addresses two items that were included in the original design, as follows: Trail Width - The original plans included a 8' bituminous trail along the east side of Armstrong Blvd. For maintenance purposes, the City has determined that all trails should be 10' wide. Drainage Along Armstrong - During the construction it was discovered that there is an elevation conflict between the two sets of plans. Essentially, the plans for Armstrong designed the east boulevard to existing ground. The design for Sunwood Drive and the COR TWO retail area depicted mass grading east of Armstrong to prepare the building sites for the COR TWO retail area. This resulted in approximately a 4 to 6 foot conflict in elevations, and created a drainage concern. Due to the mass grading, one catchbasin cannot be used as the depth is incorrect and there is no practical way to direct stormwater to that location when taking into consideration the COR TWO plat. After several design concepts and iterations, it was determined that the most feasible solution is extending the curb to the south 126' to prevent the runoff from Armstrong Blvd from sheet flowing onto the proposed parking area in the COR TWO. The estimated cost increase associated with Supplemental Agreement #1 is $5,001. Change Order #2 This Change Order is associated with the large diameter outlet pipe from the North Commons project area to the newly excavated Lake Ramsey. Currently, the storm sewer is stubbed and is directly below the right turn lane on Bunker Lake Blvd. Extending the pipe will consist of lane closures on Bunker Lake Blvd, dewatering, installing a 108" diameter manhole, installing 210 LF of 73" Arch Pipe, bituminous patching, and other miscellaneous work. It will also be necessary to lower an existing watermain that will conflict with the storm sewer. The estimated cost of Change Order #2 is $184,114. Connexus Relocation Charges We were recently informed by the development manager that the electric cabinet recently installed by Connexus is in a location that will obscure the proposed development signage for the COR TWO and must be relocated. The current location was well communicated by all parties at several weekly construction meetings. However, the attendees at the weekly construction meetings did not have knowledge that this same issue was discussed approximately one year earlier. The Development Manager has provided information showing that approved locations for cabinets had been provided to Connexus in 2011. Connexus has responded indicating that some alignments have changed and there were more recent communications regarding the cabinet locations. The estimated cost provided by Connexus to relocate the cabinet is $10,620. Notification: Tom Keller from Connexus was notified and invited to attend Observations: