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City of Everett Water Treatment Plant Facility Plan Amendment 2 I Scope of Work <br />• 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 (0&M) Manual. Specific responsibilities include: <br />• Review DOH guidelines related to water treatment plant operations manuals. <br />• Review existing WFP 0&M Manual and identify possible regulatory deficiencies and/or <br />technical changes that need to be addressed. <br />• Review WFP 0&M Manual text that the City has revised based on initial comments and <br />provide technical editorial assistance. <br />Page 6 of 8 <br />