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<br />APPENDIX A <br /> <br />. System Component Definitions <br /> <br />The below facility process components were selected because they represent existing <br />distinct processesj components, as well as new processesj components anticipated in the <br />future (e.g., tertiary filters and effluent reuse). These facility components also relate <br />differently to system capacity parameters (discussed in Methodology Element Two), so the <br />initial allocation of project costs to facility components facilitates the next step of allocating <br />costs to capacity parameters, and ultimately to user type. As regulatory requirements <br />change in the future, MWMC should re:view the facility component categories, and update <br />as appropriate. <br /> <br />Collection System Pipeline - The pipelines owned and operated by MWMC that collect <br />sewage from. individual customers and deliver it to the treatment plant. <br /> <br />Collection System Pump Stations - MWMC pump stations that impart energy into the <br />wastewater so that it flows through the collection system pipes or is lifted to a higher <br />elevation. The influent screw pumps at the EugenejSpringfield Water Pollution Control <br />Facility (WPCF) are included in this component. <br /> <br />Preliminary Treatment - Screenings and grit removal facilities. Preliminary treatment <br />facilities are sometimes referred to as headworks facilities because they are located at the <br />front or head end of treatment plants. <br /> <br />Primary Treatment - The sedimentation process intended to remove suspended solids from <br />the wastewater. This component includes the primary sedimentation settling tanks and <br />associated pumping systems for material that is removed ftom the top (scum/ skimmings) <br />and bottom (primary sludge) of the settling tanks. <br /> <br />Secondary Treatment - A biological process to remove the soluble and colloidal organic <br />matter that remains after primary treatment. Facilities typically include aeration basins and <br />the associated blowers that provide air to the basins, and secondary clarification settling <br />tanks and the associated pumping facilities that transport the settled biological sludge to <br />subsequent biosolids processing facilities. <br /> <br />DisinfectionjOutfall- Process elements at the downstream end of the treatment process. <br />Disinfection kills or inactivates remaining pathogens contained in the treated wastewater, <br />and the outfall conveys the treated wastewater to the Willamette River where it can be <br />distributed through a diffuser in an environmentally sound m.anrler. <br /> <br />Biosolids - Management and disposal of the organic and inorganic suspended solids that <br />have been removed from the wastewater through the treatment processes. This facility <br />component is divided into three subcomponents because of differences in available and <br />future required capacity. The three subcomponents are as follows: <br /> <br />· General- The general subcomponent consists of biosolids thickening and anaerobic <br />digestion at the WPCF; the biosolids pump stationj force main system that conveys <br />