CC - Agendas - City Council - REGULAR - 7/10/2012

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4311<6 COUNCIL AGENDA MEMO - July 10, 2012 DEPARTMENT: Public Works AGENDA ITEM: Approval of a professional services agreement with Carollo Engineers Inc., for the 2012 City Potable Water System Model Update in an amount not to exceed $230,000.00. Approved By: Date: Department Head: Mark Nietupski, Public Works Director Finance Director: Mark Woodfill City Manager: Craig McConnell 7'Z-/2- Item Summary Approval of this item will award a contract to Carollo Engineers Inc., for the 2012 City Potable Water System Model Update. The update will integrate new private development water infrastructure and capital improvement upgrades since the adoption of the current Water Model report of 2005. It will also anticipate future needs of the system through the development of a 5, 10, 15, and 20 year Capital Improvement Plan (CIP), identify system inefficiencies, make recommendations for improvements, integrate additional water resources into the primary distribution system, and graphically identify new service benefit areas (zones) associated with specific projects as required under new legislation for the collection of impact fees related to growth. Background The current Water System Model was developed in 2005 using Geographical Information System (GIS) software and computer hydraulic modeling as the platform. The model serves as a virtual representation of the water system which can be manipulated to test system modification scenarios to understand potential effects on performance (flow, pressure, volume) for effective management of operations and improvement planning. Updating the Water System Model periodically is necessary to assure it accurately represents existing system conditions. The validity of outcomes generated through scenario assessments will be based on the accuracy of the Model. The City potable water system is technically complex and includes 30 storage tanks, 40 pump stations, and over 90 pressure zones. The system currently serves customers in Prescott, portions of Yavapai County, Yavapai Prescott Indian Tribe, and portions of Chino Valley. Through utilization of the Water System Model capital improvement needs are prioritized in relation to identified deficiencies (low pressure, inadequate capacity, fire flows etc.) to provide first class water utility service to the community in conformance with regulatory requirements. These recommendations support future year budget considerations for improvements and upgrades to the system. The City brought Airport Well #2 on-line in January of 2011. This well provides an additional water production source to the system and supplies water solely to the Airport