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7 <br /> convertibility include locating rollup doors and/or knockout panels for hypochlorite tank replacement or <br /> ton-cylinder delivery, dual-use truck unload station and ceiling space allowances for a mono-rail system_The - <br /> floor of the building will be designed to provide spill containment with sumps to allow pumping the spillage. <br /> To improve operator access and remain dear of the containment volume, all tanks and pumps will be <br /> elevated on equipment pads. Deck grating will be laid out to allow operation of valves and access to <br /> equipment above the spill containment volume. <br /> In addition to the hypochlorite process mechanical and electrical equipment, the design will also include <br /> standard utilities including lighting,potable water,HVAC and a sink. <br /> Truck Access Road and Unloading Station <br /> Access to the new building will be along new asphalt concrete roads designed to spur from existing E\VFP <br /> roads so that trucks can access the unloading station. The station will be covered and spill containment will <br /> be included. The access road will either ramp down into the unload area or pass over a smooth curb. The <br /> station will include a pipe rack and manifold with connection couplings to unload the hypochlorite delivery <br /> trucks. <br /> Storage Tanks and Transfer Pumps and Process Equipment <br /> The hypochlorite storage and pumping system design will include six storage tanks.Two of the storage tanks <br /> will not be installed during the initial facility construction.The storage and pumping facility includes: <br /> • Two tank-to-tank or truck-to-tank transfer pumps <br /> • Four 10,000-gallon useable-volume storage tanks <br /> • Multiple Positive Displacement Pumps or Liquid V-notch Weirs for metering <br /> • Associated instrumentation and controls <br /> • Compressed Air and Air Dryer System <br /> Basic system flow is: truck to storage tank through transfer pump to service tanks through transfer pump <br /> through metering system and yard piping to metering point diffuser. Each of the four storage tanks can be <br /> used to directly supply the metering system.No day tanks will be used. Hypochlorite flow from the metering <br /> system will be enhanced with carrier water.Tank suction piping and the transfer pumps will be piped to allow <br /> tank-to-tank transfer to allow rapid tank emptying in the event of leakage. Sampling water will be pumped to <br /> new analyzers in the hypochlorite building via new piping using the existing sampling pumps. All <br /> hypochlorite components will be designed to minimize the impact of hypochlorite salt precipitation within <br /> piping,valves and equipment. <br /> The metering system will be designed to supply ten disinfection points in existing and future components of <br /> the E\VFP.Because metering is not continuous to each of the disinfection points,the number of primary and <br /> backup metering pumps/weirs requires detailed process development reliant upon E\\'FP input. Metering <br /> and chlorine analyzer process and instrumentation will be evaluated and designed during the first three <br /> meetings between EWFP staff,the City of Everett and the Engineer. <br /> Site Piping and Tie In to Existing Chlorine Lines <br /> Metering pump and carrier water discharge will be routed, in double-containment piping if necessary. <br /> underground from the new hypochlorite building to the existing chlorine metering point except that a new. <br /> low-flow diffuser will be installed. The double-containment piping will include a leak detection system. <br /> Because of concerns of existing glued joints, existing chlorine piping will be abandoned in place and isolated <br /> Page 3 <br /> S:\JMcC1e111UP-3193-WFP Chlorine B1dg1EWFP NaOC1 Scope of Work R3.doc <br /> 44 <br />