4.4. SR 03-20-2017 - Laserfiche WebLink

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SECTION 2.0 ELK RIVER WASTEWATER TREATMENT AND CHARACTERISTICS 2.1 Elk River Wastewater Treatment Facilities As indicated previously, the Elk River WWTF is in the construction phase of a facility improvements project designed to provide increased treatment capacity. The improvements are designed for an average wet weather flow of 4.54 MGD, which is 3-4 times greater than current average influent flow and a carbonaceous biochemical oxygen demand (CBODs) load of 7,220 lb/day. When complete, treatment will include mechanical screening, influent flow measurement, grit removal, primary clarification, extended aeration activated sludge, chemical phosphorus removal, final clarification, media filtration, and ultraviolet disinfection. Biosolids management includes anaerobic digestion, storage and land application. 2.2 Service Area The City of Elk River has a land area of approximately 28,000 acres within the city limits which has been delineated into either rural areas or urban service areas. The City provides water and sewer services to residents within the urban service area. Figure 1 is a map of the Elk River boundary and the urban service area. As indicated, Waste Management is located outside the urban service area, but within the Elk River City Limits. 2.3 Flow A summary of monthly average flow to the WWTF for 2006 to 2014 are presented in Table 1. The historical flow variation data is shown in Figure 2. From the observed historical data, the current Average Dry Weather (ADW) flow is approximately 1.1-1.2 MGD and the Average Wet Weather (AWW) flow is typically 1.2-1.5 MGD. The 20 -year projected design AWW flow for the facility is of 4.54 MGD. City of'Elk River, Minnesota — T21.109643 Page 6 Elk River/Waste Management Leachate Study Prepared by Bolton & Menk, Inc.