08/10/1998 Council Packet - Laserfiche WebLink

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AGENDA ITEM 4E STAFF ORIGINATOR: David Ahrens, Public Works DirectorlCity Engineer DATE: August 10, 1998 TOPIC: Resolution No 98 -127, Approve Payment No 4 (final) and Change Orders No 1 & 2, 1997 Wear Course and Trail Paving Project BACKKGROUNC; The Contractor for the 1997 Wear Course and Trail Paving Project is requesting City approval of payment no 4 (final) in the amount of $15,186.04 :including change orders 1 and 2. All necessary lien waivers and Withholding Affidavits have been submitted, to staff thereby meeting the requirements of the Construction Contract. The project included the paving of certain trails throughout the. City and construction of a trail along the north side of Aqua Lane. Also, wear course paving was done in new developments. The final contract amount is summarized as follows: Original Bid Amount $185,665.25 Change Order No 1 $ 15,234.33 Change Order No 2 $ 14.122.50 Final Contract Amount $215,022.08 The attached memorandums from John Powell, TKDA, Inc., discuss the change orders in detail. Change Order No 1 is a compensating change order for quantity overrurfsiunderruns. The trail construction along Aqua Lane resulted in quantity increases as a result of poor subbase materials that were exposed during construction. Change Order No. 2 is a result of the construction observer noting that the existing rubberized seal used on manhole adjustment rings and castings was not sufficient to properly seal the rings and casting. Since the rings and casting are areas where a significant amount of infiltration can occur or sand washing between the rings, staff directed the contractor to install additional rubberized seals to prevent any infiltration of water. In both change order cases, the problems encountered were not anticipated and it was only after work had begun and the materials exposed that the construction observer noted problems that required correction. If the design of the project had anticipated the poor soils and deficient seals, the resulting contract amount would be nearly equal to the final amount noted above.