Agenda - Council - 09/14/2010 - Laserfiche WebLink

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Rum River Water Management Organization regarding the existing mitigation permit, in favor of RTC LLC, for all wetland impacts within the Town Center development. Due to this, the wetland component located at the cast end of the Park, and all associated infrastructure, which included a 60' pedestrian bridge and two observation platforms, were not awarded at that time. In June, Council approved a change order to add these structural elements back into the park contract ($207,291). Mr. Himmer explained that it has been determined that soil corrections would be required to implement this portion of the contract in this wetland area. The area around the footings for those proposed structures will require a ten -foot sub cut and correction with clean sand. The unit prices for this work are already contained within the contract, and are estimated at approximately $20,000. Due to the depth of these required conditions, additional dewatering will also be necessary. Gohman submitted a change order request for $67,398; however, staff did not agree with that amount. Staff did not have a problem with the numbers for the soil going out and coming in. The problem is now we will be down below the water table and they want us to pay for a month of dewatering. Staff received a quote from Blake Drilling Company in the amount of $15,248 for one week, and $4,233 per week thereafter. After meeting with the contractor on site, it was determined that dewatering, depending upon the weather conditions, would likely be performed in less than two weeks. Mr. Himmer went on to explain that the City /contractor is also responsible for fuel and maintenance of the pumping equipment during the duration of the dewatering activities at an estimated cost of $750 per week. A temporary road would also be required to get the equipment in to execute the drilling for the well points at a cost of $3,000. W. Gohman is also requesting $5,000 for site supervision since they are the ones that need to warranty the work. In summary, the total change order would then be $51,450. Mr. Himmer explained that there is the potential to offset correction costs. Consistent with staffs original recommendation at the time the contract was awarded, we would request that Council consider removing observation platform A from the project. Staffs recommendation for this wetland area at the time initially was to build two overlooks and a bridge — Council had said to build it all - now there is the opportunity to review this. Mayor Ramsey asked about removing which observation point. Director of Public Works Olson recommended eliminating one on the south side closest to the PACT Charter School and to keep the one closest to the townhouses. Mayor Ramsey asked if there would be any reason to flip them. Mr. Himmer replied this way seemed to make the most sense. Discussion ensued relating to the dewatering and the noise, etc. It was noted that the neighborhood would be notified. Motion by Mayor Ramsey and seconded by Councilmember Jeffrey to eliminate one observation platform and approve the net change order in the amount of $6,828. Motion carried. Voting Yes: Mayor Ramsey, Councilmembers Jeffrey, Look, McGlone and Wise. Voting No: None. Absent: Councilmembers Dehen and Elvig. Special City Council — August 3, 2010 Page 2 of 3