2005/04/27 Council Agenda Packet

11 7.0 Task 7 — Water Rights and System Reliability (CWP Chapter 6) 7.1 Objective Perform a water rights and system reliability analysis including inventory, comparison with future needs, and interties to meet DOH planning requirements under the 2003 Municipal Water Rights Legislation and to provide an interpretive description. Table 3 and Table 4 of the DOH Water System Planning Handbook (April 1997) are required to be completed as an element of an updated WSP. 7.2 HDR Services 1. Perform a water right inventory and analysis to identify and summarize the status of the City's existing water rights with input from the City. Confirm or modify the summary after a review of City records and Ecology files pertaining to the basic documents of each water right file (permit, certificate, etc.). The depth of this analysis will be sufficient to complete the tabulated Existing Water Right Status required in the DOH Water System Planning Handbook. 2. Prepare future supply water rights analysis to determine the adequacy of the City's existing surface and groundwater water rights to meet the 6 and 20-year demand forecast developed for the WSP update. Service area considerations related to purpose and place of use and service limitations (if any) will be evaluated. The depth of this analysis will be sufficient to complete the tabulated Water System Planning Handbook (Forecasted Water Right Status) as required by DOH. Water rights will also be compared to buildout demand forecasts. 3. Document the status of any existing or proposed interties. 4. Update the 2000 source of supply analysis to determine the adequacy of water quantity to meet future demands. Describe the City's efforts related to maintaining adequate sources of supply and demonstrate that the sources of supply are within the amounts authorized under the City's existing water rights adequacy, and facility reliability. 5. Update the water system reliability analysis describing existing and/or proposed water system supply and distribution of the needed water quantities to meet forecast system demands. 6. Evaluate and discuss the existing watershed control program with City staff and work with City staff to determine additional controls needed within the watershed areas to protect the source area. 7. Update the 2000 watershed yield analysis to account for potential climate change Impacts. HDR will work with Dr. Richard Palmer of the University of Washington to prepare this update. Potential climate change impacts will be evaluated related to the overall long-term yield of the Spada Lake watershed: • Two senior staff will attend up to three meetings with City staff and others as the City coordinates climate change scenarios with Seattle, Tacoma, and the Central Puget Sound Forum. • Organize and host a half-day workshop at HDR between City staff, HDR staff, and Dr. Palmer to discuss Crystal model updating and possible future scenarios related to climate change and their impact on the Spada Reservoir system hydrology. During this Everett Comprehensive Water Plan April 15, 2005 Exhibit A—Scope of Services Page 8 of 21 z