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Exhibit A <br /> 2.3—EWPS Upstream Piping Evaluation (City) <br /> • Evaluate condition of suction piping for EWPS. City staff will provide piping <br /> age and verify piping configuration. <br /> • Identify suction piping capacity using hydraulic analysis. Update the City's <br /> existing hydraulic analysis model with detailed suction piping information <br /> provided by the City. <br /> • Hydraulic transient analyses are not included in work activities identified <br /> under Phase 1. If required, hydraulic transient analyses will be performed as <br /> part of final design activities, after final station capacities and piping <br /> configurations have been identified. <br /> 2.4—EWPS Upgrade Alternatives (City) <br /> Work activities associated with Task 2.4 are focused on identifying and evaluating <br /> alternatives for providing required future capacity at the existing EWPS. Three <br /> alternatives will be evaluated: <br /> • Construct a new pump station within the confines of the existing Evergreen <br /> Way site. This alternative would optimize number and capacity of future <br /> pumps and motors, electrical components and appurtenant valves and piping. <br /> • Upgrade the existing EWPS to provide future capacity needs focusing on the <br /> following components: <br /> • Pumps—required capacities and staging for optimal efficiency <br /> • Motors <br /> • Impellers/Cans (determine if these need to be replaced or if the existing <br /> ones can be modified). <br /> • Identify required structural, mechanical (including in-station valving <br /> and piping), and electrical improvements/expansion associated with <br /> each alternative. <br /> • Identify valve and related equipment maintenance, repair and <br /> operations issues. <br /> • Expand the existing structure to provide additional room for new pumps, <br /> motors and electrical switchgear. This alternative would evaluate: <br /> • Optimal number and configuration of new pumps, motors and electrical <br /> switchgear. <br /> • Identification of required valving,piping and mechanical equipment. <br /> • Evaluation of comparative capital and 0 & M costs, operations issues <br /> and permitting considerations associated with use of diesel or natural <br /> gas drives on new pumps in lieu of electric motors. <br /> • Evaluation of rehabilitation requirements of existing aged pumps, <br /> motors and mechanical equipment. <br /> Db <br /> Phase I Scope(2/28/03) 3 <br />