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MWMC FACILmES PLAN 1.4 Previous Planning Efforts Prior to 1997, no comprehensive evaluation of the regional wastewater treatment facilities had been performed since its startup in 1984. In the mid 1990s MWMC initiated a study to prepare a Master Plan in order to determine how the treatment processes and facilities were performing relative to the original capacity and performance expectations. The Master Plan (CH2M HILL, 1997) was completed in 1997 and recommended further evaluations to assess the facilities' capacity to treat peak wet weather flows, and to adequately process biosolids. The Biosolids Management Plan (described above) was completed in 1997. In late 1997, MWMC initiated a project to develop a comprehensive Wet Weather Flow Management Plan (WWFMP), which was adopted by the MWMC and the two cities in 2001 (CH2M HILL, 2001). In 2000 MWMC initiated a project to develop a feasibility study and management plan for a dedicated biosolids land application site. This report was completed in 2003 (CH2M HILL, 2003). 1.4.1 Master Plan The 1997 Master Plan provided an evaluation of the E-S WPCF based on historical flow, loads, and monitoring report data. Other selected facilities of the regional sewerage system were also evaluated. The purpose of the plan was intended to be twofold: 1) identify low- cost capital improvements that could be implemented in the short term (3 to 5 years) to improve facility operations, and 2) identify facility expansion improvements that would need to be implemented over a longer term to meet increasing regional demands for sewerage service or more stringent regulatory requirements, and to address specific priority issues affecting the WPCF. This plan did not include development of a comprehensive hydraulic and treatment process model. However, key evaluations included a limited flow and load analysis, general strategies to manage peak flows, an assessment of infiltration/inflow (I/I) programs, a preliminary peak flow assessment, a disinfection alternatives evaluation, a U.S. Environmental Protection Agency (EPA) risk management program evaluation, a preliminary biosolids management evaluation that led into the 1997 Biosolids Management Plan, and a plant effluent regulatory assessment. 1.4.2 Wet Weather Flow Management Plan The 2001 WWFMP was developed from recommendations in the 1997 Master Plan and results of preliminary analysis using a hydraulic model developed for the regional wastewater collection system. Developing the plan consisted of evaluating technologies for managing excess wet weather flow relative to performance, frequency of sanitary sewer overflows (SSOs), cost, and political and community acceptance. The overall objective of the plan was to determine the most cost-effective and politically feasible set of solutions for managing excessive wet weather wastewater flow rates both in the collection system and at the WPCF. The WWFMP was guided by a steering committee of approximately 20 Eugene and Springfield public works staff, and involved an extensive public involvement process. Staff from the cities forged a partnership to guide the project and to gather, review, analyze and interpret data as well as perform hydraulic modeling. A data subcommittee to the steering committee performed much of the technical analysis. A Citizens Advisory Committee (CAC) was charged with reflecting community values and concerns, assisting in evaluating 1-4 MWMC 1.0 REV13.DOC