Agenda - Council - 09/24/2024 - Laserfiche WebLink

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Building a Better World for All of Us» City of Ramsey OWNER 21-08 OWNER'S PROJECT NO. Water Treatment Plant Trunk Water Main Improvements PROJECT DESCRIPTION The following changes shall be made to the contract documents: Description: This change order consists of two separate items. CHANGE ORDER September 4, 2024 DATE 3 CHANGE ORDER NO, RAM SY 174498 71.50 SEH FILE NO. 1. At the intersection of Bunker Lake Boulevard and 143rd Ave/Azurite St., the plans called for the 20-inch trunk watermain to connect to the existing north -south 16-inch water main via horizontal directional drilling (HDD) methods. A proposed drilling pit was planned at the tee of the two water main pipes. Because the existing 16-inch pipe was fairly deep and the pit was located in the edge of the driving lane for northbound Bunker Lake Boulevard, the work would have resulted in both lanes of Bunker Lake Boulevard to be closed to traffic. Anoka County would not allow these lane closures during normal Monday -Friday traffic but rather they required a 1 day Saturday closure. Additionally, there was no way to install a 20-inch pipe to the existing 16-inch without a wet tap to keep the 16-inch trunk main in service. Based on those factors, it was determined to do this work on a Saturday shut down and install all the 20- inch pipe across Bunker Lake Boulevard via open cut rather than HDD. Anoka County issued a road closure/detour permit and the work was done on Saturday, August 24. Attached is a letter from Northdale outlining the effort it took to complete this work during the 1 day closure. The total cost of this change was $69,595.11. 2. The second change consists of concrete removal under the existing 143rd Ave. pavement, as a "change in conditions." During water main installation on 143rd Ave, they discovered subsurface concrete to a depth of 5-feet below grade. The extent of this concrete was approximately 185 feet long and one 8-foot wide trench was required to install the water main. This work required an additional larger backhoe with a concrete ripper/jack hammer attachment. Attached sis a letter from Northdale outlining the effort it took to remove this concrete. The total change order for their time and materials is $55,170.34. Engineers j Architects I Planners I Scientists Short Elliott Hendrickson Inc., 10650 Red Circle Drive, Suite 500, Minnetonka, MN 55343-9229 952.91 2.2600 I 800.734.6757 I 888.908.81 66 fax I sehinc.com SEH is 100% employee -owned I Affirmative Action —Equal Opportunity Employer