Label
DPU021522AMENDINGCONTRACTFORUPDATEDCURVESYSTEM
Water Treatment
Jacob Goetz x2399
Revised
Title
Authorizing the mayor to execute an amendment to the water distribution modeling contract with Arcadis US Inc. to include work related to High Service Pumping Station system curve update, adding an additional cost of $33,200; waiving competitive proposals under TMC Ch. 187; and declaring an emergency.
Body
SUMMARY & BACKGROUND:
The City entered into a contract, authorized by Ordinance 303-19, with Arcadis US, Inc. for professional engineering services for the water distributions system Model Update and Master Plan through a competitive proposal bidding process. Work under this contract is continuing.
Simultaneous to the update to the water distribution system model, the rehabilitation of the High Service Pumping Station (HSPS) is also taking place. As a result of the pump work at HSPS, the current system of curves which predict pump performance and indicate which combination of pumps should be used for various operating conditions is obsolete. The scope of the proposed work includes two sequential tasks. The first is using the distribution system model to generate a system curve for the distribution system. The second is using the system curve to develop an operational chart, which will act as the standard operating procedure (SOP) for the High Service Pumping Station. The completed chart SOP will also aid in maximizing the useful life of the new and refurbished pumps as well as minimizing risk of local depressurization within the distribution system as regulated by OEPA.
This work is essential to the implementation of the improvements to the HSPS. The system curve is largely determined by the complex distribution system and is therefore best updated by Arcadis due to their expertise as a result of their work with the distribution system model. Amending the scope of work of the existing Arcadis contract is in the best interest of the city as it ...
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