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controls,media, and the chlorine feed system will be evaluated. Modifications to the <br /> chlorine feed system shall include an inline chlorine analyzer to protect against over <br /> chlorination. <br /> It is proposed that the City reevaluate the filter capacity in the future,when the peak <br /> hourly flows to the facility reach 90 percent of the capacity of the existing filters. <br /> 4.2.2.9. Disinfection <br /> Capacity of the existing UV system at PHWW flow is 3.0 MGD which is 4.27 MGD <br /> short in capacity for Design Option No. 2. An existing channel is available for <br /> installation of new UV equipment to double the current capacity. However, this addition <br /> will not meet the future demands for Design Option No. 2. In order to meet the future <br /> demands new UV units would need to be installed in both channels. The new UV units <br /> would need to provide a higher intensity than the existing unit in order to increase the <br /> total capacity to meet design requirements. Additional improvements would include <br /> replacing the effluent weir on the existing UV channel with a fixed depth finger weir. <br /> 4.2.2.10. Electrical/Controls <br /> The existing control system does not include a central control system for the entire <br /> wastewater treatment facility. Upgrades to the control system will include a new control <br /> building with a centralized control system that will allow the operators to monitor and <br /> control all units of the treatment process from one location. A new control building and <br /> garage area is needed since the activated sludge process will require removal of the <br /> existing control building and garage space. The new control building will house the <br /> upgraded control system and will also include laboratory and garage areas. <br /> 4.3 Biosolids Treatment Process <br /> This section discusses four alternatives for biosolids handling which are pumping biosolids to <br /> Great River Energy (GRE), expansion of the existing anaerobic treatment system,heat drying, <br /> and regionalization. <br /> City of Elk River—T12.104758 Page 24 <br /> Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. <br />