2008/04/30 Council Agenda Packet

Project: Sewer I, Water J Replacement Change Order No.1 Change Order Effective Date: January 15, 2008 Net contract price increase as a result of adding the above twelve new bid items comes to $296,018.67. Net contract price increase from modify seven existing items and adding twelve new bid items to the contract then comes to a $556,483.67. JUSTIFICATION: Justification for the modification of the existing bid items. Bid Item #4 — Traffic Control Labor. Additional hours of Traffic Control Labor are required beyond the quantities allowed for in the original bid proposal. Bid Item #6 — Street Cleaning & Sweeping. Additional hours of Street Cleaning & Sweeping are required beyond the quantities allowed for in the original bid proposal. Bid Item #15 — Concrete Pavement Patch. Additional square yards of Concrete Pavement Patch are required beyond the quantities allowed for in the original bid proposal. Bid Item #16 — Gravel Borrow. Additional tons of Gravel Borrow are required beyond the quantities allowed for in the original bid proposal. Bid Item #26 — Combined Sewer Pipe, 21 -inch diameter, PVC F679 Type 1. The design called for the use of the pipe bursting method to install 173 linear feet of 24 -inch diameter, HDPE, DR 17, Pipe in 15th Street, from Oakes Avenue to the alleyway between Oakes and Lombard Avenues. After installation the grade of the pipe was not adequate and the bursting method heaved the roadway surface thus requiring this 173 linear foot section of sewer pipe to be reconstructed with Combined Sewer Pipe, 21 -inch diameter, PVC F679 Type 1 pipe under bid item #26. Additionally the designed called for installation of 480 linear feet of Combined Sewer Pipe, 24 -inch diameter, HDPE, DR 17, Pipe by the pipe bursting method in the 1400 block of Oakes Avenue. To avoid a similar experience as what occurred with the failed 15th Street Pipe Bursting incident, new combined Sewer Pipe, 21 -inch diameter, PVC F679 Type 1 Pipe was installed in the 1400 block of Oakes Avenue, in -lieu -of the as designed method. The net result was a 653 linear foot increase in use of the pipe under bid item 926 and a 480 linear foot decrease in the use of pipe under bid item #29. Bid Item #29 — Combined Sewer Pipe, 24 -inch diameter, HDPE, DR 17, Installed by Pipe Bursting. See justification underbid item #26. Bid Item #42- Concrete Sidewalk Restoration, 4 -Inch Thick. Additional square yards of Concrete Sidewalk Restoration, 4 -Inch Thick are required beyond the quantities allowed for in the original pipe proposal. Justification for the Addition of the New Bid Items. New Bid Item #49- Concrete Roadway. New Bid Item #50 — 6 -Inch Curb Machine Cast. New Bid Item #51— 6 -Inch Curb Hand Formed. New Bid Item #52 — Concrete Roadway Removal. Page 5 of 6 -