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CASE #2 CHANGE ORDER NO.1 FOR IMPROVEMENT PROJECT #98-13 CASING PIPES FOR C.R. #116 CROSSING By: Steve Jankowski, City Engineer Background: Improvement Project #98-13 involves the fitting of Well No.4 with a pump and transmission main. The project has 2,000 feet of lO-inch transmission pipe from Well No.4 to the well house containing Well #3. This ten-inch transmission main crosses the future C.R. #116 extension. Although the County does not require casing pipe under its roadway (the State of Minnesota, MnDOT does), casing the crossing has significant advantages should it be necessary to repair the main at some point in the future. (1) It greatly reduces the cost of excavating the roadway for repair, (2) avoids patching of a major county arterial roadway. (3) eliminates inconvenience caused by traffic control associated with detouring of the highway during repair, and (4) greatly increases the safety of the workers by making the repair outside of traffic. Attached is a proposal for the installation of casing pipe associated with the Well No.4 transmission main and other future crossings of watennain beneath the roadway. Item #1 is a cost of $8,700 for casing the 10-inch transmission main. Because the contractor has already started installation, I have authorized this work to be done to avoid delay damages. Item #2 calls for the extension of a 12-inch watermain and casing on the west side of C.R. #56. This work has not been authorized. Finally, item #3 presents prices for installing a casing pipe of various sizes for future use in installing sewer and water casing pipes to avoid boring and jacking costs which will cost up to $16,000 per crossing. I have included a sketch illustrating where future watennain crossing of the highway would be located consistent with our current comprehensive water system plan. Recommendation: Staff recommends that a change order be authorized in the amount of $24,380, to install the following casing pipes for watennain crossings of C.R. # 116. Item #1 As per proposal $8,700 $9,800 $3,120 $2,460 $ 300 $5,880 Item #2 As per proposal Item #3 80 ft. of20" steel pipe @ $39.00/ft. 80 ft. of 12" steel pipe @ $31.00/ft. Bulkhead steel pipe @both ends - 2 ea. @ $150.00/ea. Total Committee Action: Motion to recommend that City Council authorize C.O. #1 in the amount of$24,380 for existing and future casing pipes. Reviewed by: City Administrator City Engineer Director of Public Works Acting Finance Officer ParkslUtilities Supervisor R&B: 05/06/98 It