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DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT <br /> Page 3 <br /> Permit MN0020788 <br /> Facility Description <br /> The Elk River WWTP facility(Facility)is located at NE 1/4 of Section 3;Township 32 North,Range 26 <br /> West,Elk River, Sherburne County,Minnesota. This is a Class B facility. Major components of the <br /> ,Facility include: <br /> Collection with gravity and/or Pressure Sewer. <br /> 2 Bar Screen-mechanical <br /> Influent Flow Meter <br /> 1 Grit Removal <br /> 2 Primary Clarifier <br /> 2 Trickling Filter - <br /> I Activated Sludge-contact stabilization,conventional,step feed <br /> Phosphorus Removal-chemical <br /> 3 Secondary Clarifier <br /> Filter-sand with backwash(Proposed) <br /> Ultraviolet Light <br /> 2 Anaerobic Digester-complete mixed,heated-mesophilic <br /> 2 Storage Tank <br /> Land Application <br /> The existing Class B wastewater treatment facility consists of two mechanically cleaned bar screens, <br /> screenings wash press,influent Parshall flume,vortex-type grit removal system,two primary clarifiers, <br /> two trickling filters(currently run in series mode),aeration basin(no diffusers or blowers were <br /> provided/installed),three secondary clarifiers,ultraviolet(UV)disinfection and a chemical feed system. <br /> Biosolids treatment consists of anaerobic sludge digestion using one primary and one secondary <br /> anaerobic sludge digester. Biosolids are stored in two sludge storage tanks and eventually land applied. <br /> There are no known bypass points in the disposal system. <br /> The Facility has a continuous discharge(SD-001)to the Mississippi River(Class IB,2Bd,3B,3C,3C, <br /> 4A,4B, 5,6 water)and is designed to treat an average wet weather flow of 2.2 million gallons per day <br /> (mgd)and an average dry weather flow of 1.97 mgd. The Facility has a five day carbonaceous <br /> biochemical oxygen demand(CBOD5)strength of 200 milligrams per liter(mg11)based on the average <br /> wet weather design flow. The Facility was constructed in 1977 and upgraded in 1995_ <br /> In accordance with MPCA rules regarding nonde.gradation for outstanding resource value water <br /> (ORVW),the design average wet weather flaw of the Facility as of November 5, 1984,and associated <br /> mass loading are the baseline design flow and mass loading. This baseline flow and mass loading will be <br /> used to determine whether nondegradation review is required for any change in the discharge. Any <br /> change that results in an increased mass loading of one or more pollutants is subject to nondegradation <br /> review in accordance with Minn.R.7050.0180. <br /> The reach of the Mississippi River where the discharge from the Facility is located(between St. Cloud to <br /> Anoka)was classified as an ORVW on November 5, 1984. The design average wet weather flow of this <br /> Facility on the date of ORVW designation was 1.04 mgd. The Facility was upgraded in 1995. In order <br /> to comply with Minn.R. 7050,0180,the mass effluent limits in the NPDES/SDS permit for CBODS and <br /> total suspended solids(TSS)were frozen at the level of mass limits in existence on the date of ORVW. <br />