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7. B. 2.
Steve Lawrence, Engineering
Approval of Professional Services Contract Amendment No. 2 with Carollo Engineers Inc for the Arcadia Lake Water Treatment Plant Expansion Project; $4,455,000.
In 2009, Edmond performed a sustainable yield study on Arcadia Lake that indicated substantially more water is sustainably available for use from the lake than anticipated prior to its construction. In February, 2014, the Edmond acquired additional water rights in Arcadia Lake to increase the allowable use from 4.1 billion gallons per year to 6.5 billion gallons per year.
The 2013 Water and Wastewater Master Plan recommended that Edmond immediately expand the capacity of the Arcadia Lake Water Treatment Plant to utilize local water and maximize substantial long-term savings by not purchasing water form Oklahoma City for peak day or base loading. With the increased sustainable yield and water rights in Arcadia Lake, and the recent significant increases in the Oklahoma City wholesale water costs, it is financially advantageous to expand the water treatment plant as soon as possible.
The existing water treatment plant is capable of treating 12 million gallons of water per day (MGD) with a maximum sustainable net production rate of 10.5 MGD. With the current plant capacity, only about 2.3 billion gallons of the 6.5 billion gallon annual allotment of the water permit can be utilized.
The most constricting portion of the original water treatment plant is the lake water intake structure. Owned and operated by the Corps of Engineers, the intake consists of a 10-story structure within the lake with piping and a tunnel underneath the dam which function to release water from the lake. Since 2014, Edmond staff and two different design consultants have sought a solution with the Corps of Engineers to modify the existing structure. However, due to the current intake structure being located within the lake and underneath the dam, options for structural modifications are limited.
The only permittable solution for a path moving forward is the construction of a separate water intake that will be owned and operated by Edmond. The preliminary design has been investigated for the past two years and is nearing permitting completion. The next step is final design of the intake structure which is the majority of this contract amendment. Current construction cost estimates for the intake structure and associated raw water piping to the water treatment plant range from $35-40 million.
In 2014, Carollo Engineers was awarded a contract for the following water system master plan projects:
WTP-01: Increases the treatment capability of the water treatment plant.
ADMIN-01: Administration building at water treatment plant
RES-01: Improves handling and drying of the residuals produced during the treatment process to allow the continued beneficial use of land application.
RHB-01: Targeted rehabilitation of the existing water plant facilities.
MAIN-03: Adds a transmission water line to deliver the increased water production to the I-35 Water Complex.
TANK-02: Construction of a new at-grade water storage tanks at the I-35 Complex.
ACSMP: Automation and control systems master plan for the water and wastewater systems to update and integrate all aspects of the supervisory control and data acquisition (SCADA) system.
After another design consultant was unable to convince the Corps of Engineers of a permittable solution for Edmond's water intake needs, Carollo Engineers was asked to add design concepts and permitting to their scope of services for the intake project (INT-01).
This contract amendment will add $4,455,000 to the contract for the following professional services:
INT-01: $3,105,000 for design and bidding phase services.
WTP-01: $120,000 for additional value engineering concepts to reduce construction costs.
ADMIN-01: $580,000 for construction administration and commissioning services.
MAIN-03: $520,000 for final design.
TANK-02: $50,000 for additional preliminary design to conform to land actually acquired for the project.
ACSMP: $80,000 to update ACSMP to include current projects.
Immediate upon approval.
Professional services are necessary to produce plans and specifications for construction.
Public Works Committee and Staff recommend approval.
Motion to approve.
Budgeted Item Y/N or N/A:
Water Treatment Plant-Waterworks Construction
No file(s) attached.
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