5.5. SR 06-07-1993 - Laserfiche WebLink

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June , 1993 Honorable Mayor and City Council Otsego City Hall 13474 NE 95th Street Otsego, MN 55330 RE: JOINT SEWAGE TREATMENT PLAN Dear Council Members: The City of Elk River has recently conducted a feasibility study for the expansion of the City 1 S wastewater treatment plant (WWTP). I would like to take this opportunity to share the results of this study with you. Since the City of Otsego has been interested in the concept of joint sewage treatment with Elk River, it is important for us to inform you of the high construction cost we are facing for the proposed expansion as a result of more stringent effluent limitations. OUf feasibility study has suggested that the existing WWTP be expanded to a 2.2 million gallon per day (MGD) capacity to handle the City's sewage flow in the next 20 years. A Trickling Filter/Solids Contact process is proposed for the new treatment system. Currently, Elk River WWTP effluent is discharging into the reach of the Mississippi River classified as an "Outstanding Resource Value Water1l (ORVW). The upgraded facilities have to provide sewage treatment to nearly tertiary effluent quality. Construction cost for an expansion project of this capacity would probably be about six million dollars. If the joint sewage treatment plan is implemented, the plant's capacity \\'ould be increased to 2.55 MGD and the construction would cost an additional one million dollars. Other costs include the sharing of existing facilities, metering and sampling of Otsego' s sewage, and redesign and administration fees as shown in the attached Exhibit. Total construction cost for Otsego would probably be $1,500,000 without taking into account the collection system and lift stations for sewage conveyance. The subsequent sewage treatment charge would probably be $2.00/1,000 gallons for the first year (1995) and would be subject to adjustment each year. Design of the WWTP expansion has begun due to the fact that the existing facilities appeared to reach the critical operational capacity earlier this year. All of our treatment units had to be operated in order to control the effluent quality. The joint plan will inevitably delay the project schedule and may potentially cause the existing plant to violate effluent standards.