Council action is recommended to approve a change order to a purchase order between the City and Pullman Power LLC in the amount of $303,300.00 for roof slab repairs to the Van Horn Reservoir for the Water Department.

Council action to approve a change order.

The City issued purchase order 21000780 to Pullman Power LLC (Pullman) for $278,160.00, on March 17, 2021 for potable water storage reservoir improvements for the Van Horn Reservoir. This was for necessary improvements, repairs and maintenance to the Van Horn reservoir. This reservoir augments the supply of potable water produced by the Courtney Bend Water Plant during times of peak water usage and in emergency situations. Through the course of Pullman executing their original contracted scope of services, additional necessary repairs to the Van Horn Reservoir structure have been identified. These repairs shall be incorporated into the existing scope of services being provided by Pullman. Additional work to be performed by Pullman includes installation of a new steel reinforced cast-in-place concrete roof topping slab for the reservoir. The cost of the necessary additional work is Three Hundred and Three Thousand Three Hundred Dollars and Zero Cents ($303,300.00).

The original contracted scope of services to Pullman included removal of an existing multi-layer roof system from the reservoir’s exterior. This existing roof system was installed in the early 1990s, and had reached the end of its effective service life. Pullman’s original scope of work specified complete removal of this old system down to the concrete reservoir structure’s steel reinforced cast-in-place roof slab. Upon removal of the old roof system, and subsequent assessment by Pullman, Water Department staff, and a third party engineering consultant retained by the Water Department for assistance with the project, it was determined the reservoir’s existing cast-in-place concrete roof slab has extensive deterioration and damage. This damage was unforeseen and unable to be determined prior to removal of the old existing roof system. If left un-addressed, the damage to the existing reservoir concrete roof slab could render the reservoir unusable in the near future. Several options for appropriately addressing the damage were taken under consideration, and the proposal presented by Pullman was determined by Water Department staff to be the most appropriate action.

The Van Horn Reservoir is an essential component of the Water Department’s operations. The reservoir was constructed in the 1920’s, and execution of the additional work is anticipated to extend the useful service life of the reservoir for the foreseeable future.

This project is identified as Water Department Capital Improvement project number 70401704. The additional funding for this change order will be provided by the Water Department’s unreserved net assets and included as part of the 1st quarter supplemental appropriation ordinance to Council.

Approval of this item shall authorize change orders up to an additional ten (10) percent of the original authorized amount, provided appropriations are available.

Fiscal Impact is $303,300.00. Since the repairs were unexpected, the budget will need to be amended. This increase in expenditures will be added to the first quarter supplemental appropriation ordinance considered by Council in October, 2021.