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• • CITY COUNCIL AGENDA ITEM 6D STAFF ORIGINATOR: Jason C. Wedel, City Engineer MEETING DATE: May 13, 2012 TOPIC: Consider Resolution No. 13 -61 Approving Change Order No. 1, Otter Lake Road Street and Utility Improvements VOTE REQUIRED: 3/5 Vote Required BACKGROUND At the March 11, 2013 meeting, City Council awarded the Otter Lake Road Street and Utility Improvements to Arnt Construction Company, Inc. Construction is anticipated to start this week. After the Council awarded the contract for this project, City Staff discussed the proposed gate valves that were to be installed on the 16 -inch trunk watermain. The original plans and specifications included using butterfly style valves and boxes. These valves are common because they are the least expensive. However, when it becomes necessary for the utility department to work on the watermain, the butterfly valves can be difficult to close completely. The alternative to the butterfly valve is a traditional gate valve and box. All of the City's smaller valves throughout the City are gate valves and they are more effective at closing completely. Based on past experience, City staff would therefore like to include a change order to revise the valves specified for the Otter Lake Road Street and Utility Improvements. This project has two 16 -inch valves. The cost per butterfly valve bid was $3,050 per valve. The cost to go to a gate valve is an additional $5,390 per valve for a total cost of $8,440. The total change order for modifying the two valves is therefore $10,780. Financing for this project as originally proposed is still sufficient with the proposed change order. A breakdown of the construction cost is as follows: Original Contract Amount Change Order No. 1 Total Construction Cost $326,366.20 $ 10,780.00 $337,146.20 Original Engineer's Estimate $411,057.00 RECOMMENDATION Approve Resolution 13 -61, Approving Change Order No. 1, Otter Lake Road Improvements. ATTACHMENTS 1. Resolution No. 13 -61