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7 <br /> OVERVIEW OF DESIGN WORK <br /> The design work will be conducted with participation by the City. Follow notice to proceed,City staff will be <br /> assumed to participate in six regularly scheduled meetings during the course of design to provide input to the <br /> design process. Decisions,discussions,and information to be transferred will be documented This overview <br /> will be expanded using electronically drafted sketches and AutoCAD models during three weekly,early phase <br /> design development meetings with City staff. The Consultant will document the final design concept in a <br /> design intent memo <br /> This scope of work is based on Alternative 2 and Appendices E and K of the City of Everett Disinfection <br /> Facilities Investigation for Replacement of the Existing Chlorine System and Building at the Everett Water <br /> Filtration Plant (January 2004) and on minutes from an initial scoping meeting with E\VFP operators <br /> (24 March 2004). Table 1 lists the improvements,which are discussed in more detail below. <br /> Table 1. Disinfection System Improvements <br /> Element <br /> Sodium Hypochlorite Disinfection Facility including: <br /> Storage Building and Utilities <br /> Truck Access Road and Unloading Station <br /> Storage Tanks and Transfer and Metering Pumps or Liquid V-Notch Feeders <br /> Site Piping and Tie In to Existing Metering Points <br /> Sodium Hypochlorite Disinfection System <br /> A new system will be designed to provide disinfection to multiple feeds points (including a future second <br /> clearwell) at the EWFP using sodium hypochlorite. The new system will be designed to support 246 MGD <br /> maximum-day treatment capacity. The initial construction will include components to support 167 MGD <br /> maximum-day capacity with space allotted for eventual build-out and expansion to 246 MGD. The system <br /> will be designed to provide 30 days storage for average treatment flows or 7 days storage for peak flows, <br /> whichever is greater. The system will be designed to completely replace all components of the existing <br /> chlorine system with no tie-ins or cross-connects. All piping, equipment and structures will be designed for <br /> compatibility with process chemicals or evolved chemicals or vapors. Safety features such as tank ventilation <br /> and eye wash will be provided. <br /> Storage Building and Utilities <br /> A new building will be built to house the sodium hypochlorite storage and pumping system.The building will <br /> have architectural features similar to the E\VFP finished water pump station and will consist of a concrete <br /> slab-on-grade foundation with piles, cast-in-place concrete or masonry block walls and a pre-engineered <br /> metal roof. The building will house all components of the disinfection system described below with the <br /> exception of site utilities and yard piping routed to the existing chlorine metering points and from sampling <br /> points to the chlorine analyzers. <br /> The building will be approximately 50' x 100' and include a tank area with three adjacent rooms to contain <br /> the metering pump/V-notch system, electrical equipment and a maintenance and chemical shop. An unload <br /> station for delivery trucks will be aligned along the long dimension of the building, likely to the east for <br /> viewing from the Operations Building. Development of the floor plan will take into consideration possible <br /> future conversion of the building to support a chlorine disinfection system. The effects of layout <br /> Page 2 <br /> 5:1JMcC1ell1UP-3193-WFP Chlorine Bldg1EWFP NaOCI Scope of Worl: R_.doc <br /> 43 <br />