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6.0 Development and Evaluation of Alternatives <br /> <br />This chapter documents the identification and screening of viable system improvement <br />alternatives for addressing the various projected requirements of the planning period. It <br />outlines a range of potential unit process solutions and documents the methodology for a <br />preliminary screening evaluation process that advances certain unit process alternatives for <br />further consideration. It further describes a more rigorous unit process alternative selection <br />process. Those selected processes are used in the development of three systemwide <br />alternatives that are evaluated for permit compliance and cost-effectiveness. <br /> <br />Identification of Alternative Unit Process Solutions <br />Regulatory drivers, existing WPCF drivers, and technology drivers can all be combined to <br />form a matrix of treatment facility needs and potential solutions. Table 6.0-1 summarizes the <br />project matrix for the WPCF. The matrix identifies potential unit process solutions for all of <br />the various issues identified at the WPCF. <br /> <br />Preliminary Screening Process <br />Each of the unit process solutions identified in the project matrix were screened to <br />determine their suitability for further consideration. They were evaluated against important <br />criteria developed by MWMC and Eugene-Springfield staff at a chartering workshop. <br />Developed criteria fall into three categories: <br /> <br />· Process Performance <br />· Process O&M <br />· Process Implementation <br /> <br />Process performance criteria included the following: <br /> <br />· Reliability to meet current requirements <br />· Capability to meet future requirements <br />· Multiple applications or benefits <br />· Impact to other processes <br />· Sustainability ( chemical, power, other resource use) <br />· Minimal odor, noise, and other impacts <br /> <br />O&M criteria included the following: <br /> <br />· O&M ease and simplicity <br />· O&M flexibility <br />· O&M environment and safety <br /> <br />Process implementation criteria included the following. <br /> <br />· Capital cost <br />· Annual O&M cost <br />· 20-year present worth <br /> <br />MWMC_6.0_REV11.DOC 6-1 <br /> <br /> <br />