Title
Resolution for Approval of Amendment No. 1 to the Professional Services Agreement with Tetra Tech of Michigan, PC for the Steere Farm Engine Replacement Project ($119,931.00)
Memorandum
This memorandum and resolution requests approval of Amendment No.1 to the Professional Services Agreement with Tetra Tech of Michigan, PC for the Steere Farm Engine Replacement Project.
The Steere Farm Well Field is located on the Ann Arbor Airport property. The three active wells, each with a capacity of 2,500 gallons per minute, are critical infrastructure providing 20% of the City's raw water firm capacity to the Water Treatment Plant (WTP). The wells are currently powered by natural gas-driven engine drives, two of which were installed in 1965 and the third in 1974. They have exceeded their service life, exhibiting performance and maintenance issues, and require replacement. In March 2015, a Resolution for design services with Tetra Tech of Michigan, PC was approved by Council to evaluate alternatives for replacing the 1965 and 1974 engines. Tetra Tech's evaluation of the existing infrastructure determined that replacement of the existing natural gas engines with electric motors would improve reliability and control. In addition, they recommended adding a natural gas back-up generator to ensure the City's ability to obtain water from its well field in the event of a power outage. These recommendations are incorporated into the construction contract for this project. Also included in the design is a duct bank for the new electrical supply, a new pre-engineered building at Well House 25W, as well as electrical, mechanical, and architectural improvements to other well house buildings. This project is included in the Council-approved Capital Improvement Plan for FY17.
Tetra Tech's original scope of work included study, design, bidding, and construction phase services. Tetra Tech's study phase resulted in recommendations that differed from the assumptions made du...
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