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<br />IkrL Lt. o. <br /> <br />_ / f ~ ~ ~ ~ CONSUITING ENGINEERS <br />· -~ ~_I Maier Stewart & Associates Inc. <br /> <br />February 3, 1993 <br /> <br />File: 230-151-80 <br /> <br />Mr. Pat Klaers <br />City Administrator <br />City of Elk River <br />700 Dodge Avenue NW <br />Elk River, MN 55330 <br /> <br />RE: ELK RIVER WWTP IMPROVEMENT <br />PROPOSED DESIGN FLOW AND NEW EFFLUENT DISCHARGE STANDARDS <br /> <br />Dear Mr. Klaers: <br /> <br />. <br /> <br />The meeting with the City Council on January 25, 1993, has suggested a higher wastewater <br />treatment capacity than 2.2 million gallons per day (MGD) that was previously proposed for <br />the current plant expansion. We have extended the service area, as advised by the Council, <br />toward the east and south regions shown in Figure 1. The U. S. Census Bureau and State <br />Demographer's Office predicted the population for the Year 2000 to be 15,000-18,000. This <br />means about 3-5 percent of annual growth from the population 11,700 of the Year 1991. <br />Using the 5 percent annual growth rate, population for the Year 2012 is projected to be 32,600 <br />in the City. <br /> <br />Based on the projected population, the sewage flow at the Year 2012 is projected as follows: <br /> <br />Year 1991 - Total Population <br />Serviced Population <br />Average Wet Weather Flow (MGD) <br /> <br />11 ,700 <br />5,414 <br />0.67 <br /> <br />. <br /> <br />Year 2012 - Total Population <br />Population Increase Since 1991 <br />Existing Unsewered Becomes Sewered (Estimated) <br />Serviced Population Increase <br />Sewage Flow (gallons per day per capita, <br />including Industrial and Commercial) <br />Sewage Flow Increased (MGD) <br />Infiltration/Inflow Increased (MGD) <br />Average Wet Weather Flow (MGD) (0.67 + 2.19 + 0.13) <br />Design Flow (MGD) <br /> <br />32,600 <br />20,900 <br />1,000 <br />21,900 <br /> <br />100 <br />2.19 <br />0.13 <br />2.99 <br />3.00 <br /> <br />1959 SLOAN PLACE, SUITE 200, ST. PAUL, MINNESOTA 55117 612.774-6021 <br />9800 SHELARD PARKWAY, SUITE 102, MINNEAPOLIS, MINNESOTA 55441 612-546-0432 · Equal Opportunity Employer <br />