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<br />Biosolids facilities at the WPCF and the BMF are both sized and function to treat the BOD <br />and TSS removed during the treatment process; therefore, their allocation is split equally' <br />between BOD and TSS. <br /> <br />. BOO'- 1/2 <br />. 'TSS - 1/2 <br /> <br />Tertiary Filters <br /> <br />The existing WPCF does not have tertiary filters. The'20-year project list recommends that <br />te~ary filters be installed to enable the wP~F to consistently meet the NPDES permit <br />discharge requirements. The permit includ~s mass limits for BOD and TSS. As influent <br />flows to the .WPCF increase in the future, the effluent concentration required to mee~ the <br />mass limits decreases. Addi~on of the filters will assist with meeting these more stringent <br />effluent concentrations. From a fn!lctional basis, the main purpose of the filters is to remove <br />TSS, and-toa lesser degree BOD. From a design criteria siZing basis, average flow is used to <br />determine the size of the facilities. In the wet weather season, a portion of the peak flow . <br />may be routed to the filters for ~dditianal treatment. HoweveJ;, the .ass~ted peak flow <br />, loadirig rate onto the filters will not be the lliriiting factor interms of design criteria sizing~ <br />Following is the .allocation for the tertiary filter treatment category: ' <br /> <br />. Average Flow -1/4 <br />.' BOD -1/4 <br />. ,TSS-1/2' <br /> <br />Reuse Facilities <br /> <br />'Reuse facilities maybe constrUcted to comply with more stringent regulatory requirements <br />related to temperature andlor thermal load restrictions of Willalnette ,River discharges. <br />. Reuse facilities would allow flow to be diverted from the river by reusing plant effluent for <br />irrigation. The basic design criterion used ~o size reuse facilities is average flow; so this <br />parameter receives 100 percent of the all~ation. ' <br /> <br />. Average Flow -100percent <br /> <br />QdQr Control <br /> <br />Odor control facilities function by collecting odorous air from preliminary I primary liquids <br />treatment processes and biosolids treatment/'handlingprocesses and treating the air to <br />remove the ,odors. Odor generation is dependent on the influent loading levels and, <br />therefore; the allocatio~ is split equally between BOD and TSS because both parameters <br />contribute ~o the slzingand function of the odor control systems. <br /> <br />. BOD - 1/2 <br />. TSS-1/2 <br /> <br />Peak Flow Management <br /> <br />There are a number of future capital improvement projects that specifically function to <br />convey, treat, and.discharge the wet season peak flow. For example, the parallel <br />primary I secondary peak flow management approach is proposed solely to address peak <br /> <br />A-25 <br />