4.4. SR 03-20-2017 - Laserfiche WebLink

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Page 4 Permit MN0020788 There are no known bypass points in the disposal system. The Facility has a continuous discharge (SD -401) to the Mississippi River (Class 1C, 213d, 36, 3C, 4A, 413, 5, 6 Water) and is designed to treat an average wet -weather (flow) (AWW) of 2.2 mgd and an average dry - weather flow of 1.97 mgd. The Facility has a five-day carbonaceous biochemical oxygen demand (CBOD5) strength of 200 milligrams per Liter (mg/Q based on the average wet -weather design flow. The Facility was constructed in 1977 and upgraded in 1995. The reach of the Mississippi River where the discharge from the Facility is located (between St. Cloud to Anoka) was classified as an Outstanding Resource Value Water (ORVW) on November 5, 1984. The design AWW of this Facility on the date of QRVW designation was 1.04 mgd. In order to comply with Minn. R. 7050.0180, the mass effluent limits in the National Pollutant Discharge Elimination System {NPDES}/State Disposal System (SDS) permit for CBOD5 and total suspended solids (TSS) were frozen at the level of mass limits in existence on the date of QRVW designation. To restrict or "freeze" the mass of pollutants entering the QRVW reach, the Facility cannot increase the mass of pollutants in the effluent over that allowed by the permit on November 5, 1984. In accordance with MPCA rules regarding nondegradation for ORVWs, nondegradation review is required for any new or expanded discharge (Minn. R. 7050.0180). A new discharge is a discharge that was not in existence on the effective date the QRVW was designated as described in Minn. R. 7050.0460 and 7054.0470. An expanded discharge is a discharge that changes in volume, quality, location, or any other manner after the effective date the outstanding resource value water was designated as described in Minn. R. 7450.0460 and 7054.0470, such that an increased loading of one or more pollutants results. Any change that results in an increased mass loading of one or mare pollutants is subject to nondegradation review in accordance with Minn, R. 7050.0180. This permit also complies with Minn. R. 7453.0275 regarding anti -backsliding. Any point source discharger of sewage, industrial, or other wastes for which an NPDES/SDS permit has been issued by the MPCA that contains effluent limits more stringent than those that would be established by parts 7453.0215 to 7053.0255 shall continue to meet the effluent limits established by the permit, unless the permittee establishes that less stringent effluent limits are allowable pursuant to federal law, under section 402(o) of the Clean Water Act, United States Code, title 33, section 1342. The location of designated monitoring stations is specified on the attached "Summary of Stations" report. The location of the Facility is shown on the attached topographic map.