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• Conduct field investigation of existing system to observe vibration and other issues; interview <br /> operations and maintenance staff on performance of existing system;take photographs for use <br /> in developing demolition drawings. <br /> • Review hypochlorite facility record drawings to determine the mechanical and electrical utilities <br /> and space available for the upgraded chemical metering system. <br /> • Review historic chemical metering rates and forecasted production to determine current and <br /> future chemical dosing rates. <br /> • Conduct a hydraulic evaluation to determine the design criteria and operating conditions (head, <br /> flow, and turndown)for the chemical metering pumps. <br /> • Contact chemical metering pump suppliers for preliminary metering pump selections . <br /> • Contact vacuum chemical feed suppliers for preliminary selections. <br /> • Gather equipment costs from suppliers and develop relative cost estimates for the replacement <br /> of the hypochlorite eductors and feeders. Relative cost estimates will not be full construction <br /> cost estimates;they will be focused on the relative equipment costs. <br /> • Compare the replacement alternatives based on performance characteristics, representative <br /> cost estimates, and operation and maintenance criteria. <br /> • Develop a recommendation for the system replacement. Review recommendations with BC <br /> senior technical staff. <br /> • Conduct workshop with Plant Staff to review alternatives and recommendation. <br /> • Develop a technical memo summarizing alternatives and recommendation. (10 pages <br /> maximum) <br /> Everett Responsibilities <br /> • Provide input on evaluation criteria. <br /> • Participate in workshop and site visit/staff interviews. <br /> • Supply ten years of historic sodium hypochlorite metering rates. <br /> • Supply record drawings,specifications, and relevant existing asset information from the 2006 <br /> construction of the sodium hypochlorite facility. <br /> • Participate in BC's field inspection of existing hypochlorite metering system. <br /> Work Products <br /> • Sodium Hypochlorite Dosing System Replacement Evaluation and Alternatives technical <br /> memorandum, draft and final. <br /> Meetings <br /> • Site visit to field inspect the existing system and field verify site conditions. Assume conducted <br /> by two BC staff with a duration of 4 hours on-site. <br /> Task 114 WFP Operations and Maintenance Manual Update Support(future work) <br /> Activities/Approach: Brown and Caldwell will provide review of the updated WFP Operations and <br /> Maintenance (O&M) Manual. Specific responsibilities include: <br /> • Review DOH guidelines related to water treatment plant operations manuals. <br /> • Review existing WFP O&M Manual and identify possible regulatory deficiencies and/or <br /> technical changes that need to be addressed. <br /> • Review WFP O&M Manual text that the City has revised based on initial comments and <br /> provide technical editorial assistance. <br /> Page 6 of 8 <br />