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Staff has insufficient information to estimate the level of effort and resources that would be <br /> expected to study these issues for the purposes of evaluating Coburg's request. Therefore, no <br /> associated work activities or costs are identified in Attachment A. <br /> Collection System And Treatment Facility Capacity <br /> The MWMC facilities, and the local wastewater collection systems for Eugene and Springfield, <br /> were planned and constructed to serve the anticipated populations within the Eugene-Springfield <br /> UGB. Therefore, these facilities, and long-range facilities plans have not accounted for the <br /> conveyance and treatment of Coburg's wastewater. [Note however, Coburg's wastewater <br /> contributions would be minor in comparison to the overall system capacity, under the growth <br /> projections presented in Coburg's Facilities Plan.] The following collection and treatment <br /> system capacity issues would need to be addressed. <br /> Collection System Capacity <br /> Under the regional treatment alternative, Coburg's studies show plans to convey wastewater. <br /> through a force main (i.e., a pressurized pipe fed by a pumping station) that would cross the <br /> McKenzie River in the vicinity of Coburg Road, via the old railroad bridge. It would then <br /> connect with the Eugene collection system in one of several possible locations. In 2004, a <br /> reliminary evaluation was made of the viability of connecting Coburg s wastewater discharge to <br /> p <br /> the Eugene collection system. Further study would be needed to determine the optimal location <br /> for the connection and the extent to which capacity enhancements would be needed in the <br /> Eugene local wastewater collection system to handle the increased flows generated from Coburg. <br /> Treatment Facility Capacity <br /> In 2004, MWMC completed a 20-year Facilities Plan, which prescribes capital improvements <br /> needed to upgrade performance and expand capacity in various parts of the treatment. works, <br /> biosolids mana ement facilities, and re Tonal um stations. After over twenty years of <br /> p P <br /> g g <br /> a aci and environmental erformance <br /> operation, the treatment facilities currently experience c p ty p <br /> constraints in certain parts of the facilities under certain seasonal conditions... These capacity <br /> constraints include: 1) insufficient capacity during peak wet weather flow events, which has <br /> <br /> .resulted in unpermitted overflows and bypasses in December, 2003; and 2) inadequate solids <br /> removal capability during rainy "dry season" months, which has resulted in exceedance of <br /> discharge permit limits for solids in May, 2005. Additionally, ammonia limits and temperature <br /> management requirements, which were newly added to the discharge permit, have added <br /> capacity constraints. All. of these issues require construction of improvements to maintain permit <br /> compliance for existing sewer users and to add capacity for future users. <br /> The capital projects specified in the MWMC Facilities Plan will address the capacity and <br /> performance constraints for existing and future users through 2025. If completed in accordance <br /> with the adopted schedule, existing capacity constraints would be resolved prior to the estimated <br /> time frame of a Coburg connection (i.e. 2008). However, several factors have resulted in <br /> significant delays in capital project implementation, putting the MWMC system in greater <br /> jeopardy of failure to meet permit limits and key regulatory deadlines. Further study is needed to <br /> evaluate the adequacy of MWMC's construction progress and whether, any projects in the 20- <br /> -year facilities plan would need to be accelerated to accommodate a Coburg connection without <br /> significant risk of permit violations. <br /> City Council page 442 Page 6 <br /> <br />