CC RES 98-021 RESOLUTION AUTHORIZING SUBMITTAL OF METROPOLITAN COUNCIL ENVIRONMENTAL SERVICES LOAN APPLICATION FOR AN INFILTRATION/INFLOW REDUCTION PROJECT

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• Ob' tives The objective of the proposed project is to eliminate the sump pump-based infiltration and inflow in the City's waste water collection system. Project Benefits Sump pumps have been documented to contribute significant peak flows and long term quantities of 1/1 during extended wet weather periods. Removal of sump pumps will provide an immediate reduction in peak flows and the long term wet weather.flows. Peak reduction is a benefit to the City by reducing the potential for system backups or the need to increase pipe sizes due to high flow rates. The MCES system would experience similar benefits of reduced demands on interceptor sewers,pumping stations and treatment facilities. Reduction of the long term 1/1 will be a benefit to the City through reduced operation and maintenance costs for lift station and reduced treatment changes paid to the MCES. The MCES will receive similar,benefits in reduced operation and maintenance costs of lift stations and treatment facilities. Metro wide benefit would be realized due to the additional • capacity made available at the treatment facility. A review of the waste water flow records and discussions with local officials suggests that there may be two hundred(200)sump pumps in the city that may be identified and removed through this project. During an extremely wet year like 1996, removal of the sump pump connections may reduce annual 1/1 flows by about 15%or 16 million gallons per year. These estimates are based on several assumptions which will b investigated and documented as part of the project. Upon completion of the survey project it will be possible to more accurately predict 19 reduction potential. Bypasses The City of St. Anthony has not been required to bypass from the waste water collection system. However, during the July 1997 high flow period approximately 50 - 75 homes reported backups of waste water into their basements and many more backups may not have been reported. Description of Proposed Project The proposed project is designed to identify and remove sump pump connections to the sanitary sewer. The project will include public information,physical survey of each home (building) in the City, and follow-up survey to verify removal of sump pump connections. • The first step in the project is the adoption of an ordinance requiring inspection and removal with penalties for noncompliance. The City is currently working on this phase and the ordinance should be adopted in February 1998. A copy of the draft ordinance is attached.