08/10/1998 Council Packet - Laserfiche WebLink

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TKDA TOLTZ, KING, DUVALL, ANDERSON AND ASSOCIATES, INCORPORATED ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM 1500 PIPER JAFFRAY PLAZA 444 CEDAR STREET SAINT PAUL, MINNESOTA 55101 -2140 PHONE:612/292 -4400 FAX612/292 -0063 To: David Ahrens Reference: Change Order No. 1 Copies To: 1997 Wearing Course and Trail Paving From: John Powell Lino Lakes, Minnesota Date: June 29, 199 Commission No. 11307 -02 Change Order No. 1 summarizes the quantity changes on the referenced project. It consists of a comparison between the estimated quantities and final pay quantities for each bid item, and the resulting impact on the contract amount. The comparison indicates there was a significant difference in quantities for many bid items on the project, with the magnitude of the differences in excess of what could be expected from a normal variation in the contract quantities. These differences are attributable to the following: 1. After the contract for this project was executed, the City changed many of the trail segments to be improved to respond to new trail priority and budget information received from the Parks Department. These changes included deleting five of the ten trail segments in their entirety, deleting a portion of a sixth segment, and adding six new trail segments to the project. While the contractor agreed to complete the new trail segments at the bid unit prices, the quantities of each bid item changed. A summary of the trail segment changes and the resulting impact on the bid items is attached. 2. The City's contract included the improvement of a trail segment along the north side of Aqua Lane from Stagecoach Trail to the east. This portion of Aqua Lane was improved by Anoka County to provide access to their parks facilities. Based on information received from the County, the City's plans assumed there was an existing aggregate base shoulder on the north side of Aqua Lane which could be re- graded and used as a base for the proposed bituminous trail. When the City's contractor began grading the shoulder area for trail construction, no useable aggregate base was found. The City directed the contractor to excavate the shoulder area and import the aggregate base necessary for supporting the new trail. This resulted in a significant increase in the Common Excavation and Aggregate Base quantities, as well as some additional costs to dispose of the excavated materials off site. Compensation for the material disposal is included in Change Order No. 2 as it did not involve a contract bid item. An Equal Opportunity Employer