Agenda - Council - 06/26/1984 - Laserfiche WebLink

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I I I I '1 I I I I I I I I I I I I I Pamsey Second Interceptor ~CC 83-62 EAW - May, 1984 21a. 21c. 22. Substantial ~ewatering will be necessary ~ue to the ~epth of excavations and shallow ground water. This dewatering will almost certainly require a permit from the DNR for ground water appropr~ation. ~t will consist of uncontam- ' inated clear water and no treatment will be necessary o= required prior to its fntended discharge to the Rum R~ver. A National Pollutant Discharge Elim/nation System (NPDES) perm/t is not normally required for the discharge of dewatering water. The dewatering operations may /mpact neighboring residential wells. The contractor will be required to provide water to any water users so impacted. This will be a provision of contract language. Champlin-Anoka-Brooklyn Park Interceptor. The Anoka phase-out will not be implemented until the improvements in the Minneapolis East interceptor axe completed (See the April 1983 EAW prepared for the Champlin-Anoka-Brooklyn Park interceptor), which is tentatively scheduled for April, 1987. The Ramsey Comprehensive Sewer Plan was amended in February, 1983 to include the following flow projections, in thousand gallons ~er day: 1985 1986 1987 1988 1989 1990 Mississippi Watershed 47 98 136 168 203 242 Rum Watershed 48 78 142 203 274 328 Total 95 176 278 371 477 570 The Anoka wastewater treatment plant'design flow is 2.46 MGD. Monthly flows at Anoka in 1983 ranged between 2.48 and 2.07 MGD. The plant has been meeting discharge limitations. It is reasonable to expect that it will continue to do so even with the addition of flows from the Ramsey 2nd interceptor. The Metropolitan Council's Development Guide/Policy Plan indicates that the Anoka facility will reach capacity by 1987. The Ramsey 2nd interceptor is sufficiently sized to provide transport for a flow of 3.95 MGD. It is clear, in any event, that future sewer extensions tributary to the Anoka plant will be predicated upon adequate remaining cap, acity at Anoka, in the short term, and successful completion of the Minneapolis ,East inter- cept'or renovation and extension of the Champlin-Anoka-Brook~yn Park interceptor to the Anoka plant in the long term. 3~