Item 4 - PH on MWMC Reg. SDCs - Laserfiche WebLink

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APPENDIX A System Component Definitions The below facility process components were selected because they represent existing distinct processes/components, as well as new processes/components anticipated in the future (e.g., tertiary filters and effluent reuse). These facility components also relate differently to system capacity parameters (discussed in Methodology Element Two), so the initial allocation of project costs to facility components facilitates the next step of allocating costs to capacity parameters, and ultimately to user type. As regulatory requirements change in the future, MWMC should review the facility component categories, and update as appropriate. Collection System Pipeline--The pipelines owned and operated by MWMC that collect sewage from individual customers and deliver it to the treatment plant. Collection System Pump Stations-MWMC pump stations that impart energy into the wastewater so that it flows through the collection system pipes or is lifted to a higher elevation. The influent screw pumps at the Eugene/Springfield Water Pollution Control Facility (WPCF) are included in this component. Preliminary Treatment--Screenings and grit removal facilities. Preliminary treatment facilities are sometimes referred to as headworks facilities because they are located at the front or head end of treatment plants. Primary Treatment-The sedimentation process intended to remove suspended solids from the wastewater. This component includes the primary sedimentation settling tanks and associated pumping systems for material that is removed from the top (scum/skimmings) and bottom (primary sludge) of the settling tanks. Secondary Treatment--A biological process to remove the soluble and colloidal organic matter that remains after primary treatment. Facilities typically include aeration basins and the associated blowers that provide air to the basins, and secondary clarification settling tanks and the associated pumping facilities that transport the settled biological sludge to subsequent biosolids processing facilities. Disinfection/Outfall- Process elements at the downstream end of the treatment process. Disinfection kills or inactivates remaining pathogens contained in the treated wastewater, and the ouffall conveys the treated wastewater to the Willamette River where it can be distributed through a diffuser in an environmentally sound manner. Biosolids- Management and disposal of the organic and inorganic suspended solids that have been removed from the wastewater through the treatment processes. This facility component is divided into three subcomponents because of differences in available and future required capacity. The three subcomponents are as follows: · General--The general subcomponent consists of biosolids thickening and anaerobic digestion at the WPCF; the biosolids pump station/force main system that conveys SEA31003271388(DG). DO C/041040034