Title
Resolution to Approve the Final Balancing Change Order with Site Development Inc. for the Steere Farm Well Field Raw Water Main Replacement Project ($66,617.00)
Memorandum
Attached for your approval is a resolution to approve a Change Order with Site Development Inc. for the Steere Farm Well Field Raw Water Main Replacement Project. This change order revises the original estimated construction quantities to their final, as-constructed quantities, thereby balancing them. In addition, this change order establishes new contract items for the work that were required to satisfactorily complete the installation of the new water main.
On November 5, 2009, after a competitive bidding process, the City Council awarded the Steere Farm Well Field Raw Water Main Replacement Project to Site Development Inc. (R-09-434). The Steere Farm Well Field Raw Water Main Replacement Project replaced the existing raw water main, which was in poor condition and had experienced several breaks. The project included the construction of new water main from the City of Ann Arbor's Steere Farm Well Field, which supplies approximately 15% of the City’s annual drinking water and is piped to and treated at the Water Treatment Plant. The construction also included the installation of approximately 3,280 lineal feet of 30-inch, 774 lineal feet of 20-inch, and 687 lineal feet of 12-inch ductile iron water main, with polywrap and all appurtenances. The new water main was also constructed with a cathodic protection system to prevent corrosion and lengthen the life of the pipe. The project began in November 2009 and was substantially completed by June of 2010.
During the course of construction, it was discovered that the existing soil conditions were worse than originally anticipated and required that the new water main be placed on top of compacted stone to ensure that it was properly supported. In addition, ground water was encountered in a larger area than what was originally anticip...
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