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Comprehensive Plan Amendment Submittal Form May 2011 7 Privately Owned / Community Treatment System Local / Municipal Owned Wastewater Treatment Plant Regional Wastewater Treatment 22. Wastewater Flow: Complete the following table to show whether the amendment increases or decreases wastewater flow compared to the currently planned land use and sewer flow projections. Year Total Community Flow Pre-Amendment (mgd) Total Community Flow Post-Amendment (mgd) 2010 1.28 0.86 2020 1.47 1.30 2030 1.47 1.73 mgd = million gallons per day 23. Does the local wastewater system have adequate capacity or staged capacity to accommodate the proposed amendment? Yes. No. Explain response below: Sanitary sewer will need to be extended into the AUAR study area to provide sewer service to the various lots. The use of a small lift station may be required depending on future uses, but the system will primarily be gravity-based. 24. Does the regional wastewater system have adequate capacity or staged capacity to accommodate the proposed amendment? Yes. No. Explain response below: The MCES lift station has a flow capacity of 5.8 million gallons per day (mgd). The average daily flow pumped at this lift station between 2005 and 2010 ranged from 0.47 mgd to 0.57 mgd. The corresponding allowable peak flow, reached during precipitation events, would be a maximum of just under 2.0 mgd. Therefore, the station’s reserve capacity is approximately 3.8 mgd. Based on the MCES Sewer Available Charge (SAC) Program, the estimated peak flows generated by the Maximum Development Scenario is 0.70 mgd. Therefore, in the Maximum Development Scenario approximately 3.1 mgd of capacity would remain at the lift station after the development of the AUAR study area. Both the lift station and the regional interceptors serving the study area and southeast Mounds View have sufficient capacity to accommodate the additional flow required in each Scenario. 25. Has the community and/or Metropolitan Council identified an inflow and infiltration (I/I) problem? Yes. No. If Yes, describe steps taken to address the I/I issue and plans for action below: According the the Arden Hills Comprehensive Plan, the following steps have been outlined to address I/I: 1. Conduct additional investigation to pinpoint I&I sources. 2. Rehabilitation of defects: Serious defects that are identified during the course of the investigation will be rehabilitated to eliminate I&I sources. Since the majority of the defects that are identified will be smaller, they will be compiled and evaluated before developing a rehabilitation project. This list of defects will be regularly reviewed and prioritized to provide the most benefit. A data base of defects and projected rehabilitation methods will be maintained to prepare a priority listing of rehabilitation required to correct the problems. 3. Annual Report: An annual report will be prepared to summarize efforts and costs during the course of the year. It will include a review of flow data and comparison of changes from previous years and MCES allowable flow rates, and recommend work efforts for the following year. 26. Identify regional interceptor(s) that will be impacted by these changes and indicate if flows will be diverted from one interceptor service area to another below.