Agenda - Council - 03/24/2015 - Laserfiche WebLink

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Construction on this project began in August of 2014. During construction it was discovered that the common excavation plan quantity was roughly 46% less than what was required, that multiple work items identified in the plans did not have associated pay items, and that several pay items related to the adopted Memorandum of Understanding needed to be added to the project or needed to be significantly reduced or increased in the case of existing pay items. The resulting change order items are discussed in detail below and can be categorized under the following three categories; Common Excavation Over -nm, Added Pay Items, and Memorandum of Understanding Related Pay Items. In aggregate, these items form the basis for Change Order #2 which is attached for reference, and are included in the attached partial payment request. Common Excavation Over -run During construction it was discovered that the Common Excavation bid quantity was significantly less than what was needed to complete the project per plan. And to complicate matters, the common excavation quantity is a Plan Quantity (P) which does not allow for quantity increases at the bid unit price. The common excavation plan quantity is 52,276 cubic yards, whereas the actual final quantity upon project completion is estimated to be 97,297 cubic yards. The final estimated quantity was generated using survey data gathered after most of the grading work was completed, together with plan quantity information based on unfinished work to date. It is therefore estimated that the final common excavation quantity will over -run by 45,021 cubic yards. The contractor has agreed to complete this work at their unit bid price of $4.49 per cubic yard. The total amount of this category of change order items is $202,144.29. Added Pay Items During construction it was discovered that numerous pay items were missing from the plans but were necessary to pay for associated work as directed by the plans. The list of pay items that need to be added to the project to pay for this completed work include numbers 1 — 4, 5, 6 — 8, 11, 12, 14, 17, 20 — 22, and 24 — 30 as shown in the Change Order #2 section of attached Partial Pay Estimate #4. The total amount of this category of change order items is $100,580.70. Memorandum of Understanding Related Pay Items On May 13th, 2013, the City adopted a Memorandum of Understanding with the two Limited Liability Corporations (LLC's) that own the two large undeveloped parcels south of Riverdale Drive between Alpaca and Traprock Streets. A copy of the executed MOU is attached for reference. The MOU addresses numerous conditions and obligations of both the City and the LLC's as related to this project. The MOU also provides for required roadway right of way, trail, drainage and utility easements as needed to extend Riverdale Drive through the Outlot A Tooth Acres and Lot 1, Block 1 Diamonds parcels. During construction it was discovered that numerous conditions and requirements outlined within the MOU were never addressed therefore changes needed to be made in the field to allow construction to continue without costly delays. Among the necessary changes were several storm sewer revisions required to meet certain conditions of the MOU to ultimately allow the north end of the Anoka County owned Outlot B Tooth Acres parcel to be filled in for development, denoted as "A" in the attached figure showing the MOU related storm sewer and ponding improvements. The benefits of this work include the additional taxes that will be generated by returning this 1.5 acre parcel to the tax rolls, providing for cross -access between the two large parcels so upon development traffic will not need to access Riverdale Drive for short trips between the two parcels, and allowing the City to maintain only two regional stormwater ponds in perpetuity rather than three, saving the City significant maintenance costs over time. City staff is working with the LLC's to execute a cost -share agreement to cover the LLC's share of all MOU related project costs which total $166,422.70. Staff is also working with the LLC's to execute the required permanent drainage and utility easements over the pond on the south end of the Lot 1, Block 1 Diamonds site as required to mitigate the ponding lost due to the extension of Riverdale Drive, and to accommodate the additional required ponding needed due to the extension of Riverdale Drive. Anoka County will also be party to this easement.