4.4. SR 03-20-2017 - Laserfiche WebLink

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Table ES.2 - Summary of Municipal WWTF Receiving Leachate from WM Landfills Conveyance Options The Leachate Study addresses two alternate forcemain routes from the Waste Management facility to the Elk River Collection System. Option 1 is approximately 4.0 miles and follows Highway 169 while Option 2 is approximately 5.0 miles and follows a route along the Great Northern Trail Corridor. Estimate of probable construction costs range from $1.9 to $2.2 million for a 4 -in unlined forcemain. Recommendations Recommendations following the preliminary evaluation are consistent with the project plan outlined in the Memorandum of Understanding. The projected impacts on allocated treatment capacity and the uncertainty regarding the reduction of color and improved UVT through the biological treatment process should be tested with a pilot scale operation or via truck delivery and metered feed to the facility when the full scale activated sludge process is on-line. The pilot operations are scheduled for November 2015 following completion and start-up of the activated sludge treatment facilities at the Elk River Wastewater Treatment Facility. City of Elk River, Minnesota —121.109643 Page 4 Elk River/Waste Management Leachate Study Prepared by Bolton & Menk, Inc. Elk River, Fergus Falls, Watertown, Fort Atkinson, Port Washington, Parameter MN MN W1 W1 W1 Design Flow 4.54 5.20 2.70 3.10 (MGD) Current Average 1.30 1.80 2.5-3.0 1.7-2.0 1.22 Flow (MGD) Typical Leachate 100,000-200,000 Summer: Flow (gpd) 35,000 12,000 gallon/month 5,700 gpd gallons/day gallons/day 3,500-6,500 Winter: 6,000-12000 gpd gallon/day much lower Percent Leachate 2.7 0.67 0.14-0.21 0.34 0.50-1.00 Treatment Activated Activated Sludge Activated Sludge Activated Sludge Activated Sludge Sludge Bio -P Chem -P Bio -P Chem -P Disinfection Uy Chlorine Uy Chlorine Uy Leachate Color observed. Indicates that color No significant color Color has not been noted. No significant color. Slight Appearance and COD = 5,000- diminished through impact. BOD=240 mg/L hint of color. other 15,000 mg/L the activated sludge COD = not avail. TSS=95 mg/L BOD = not available Characteristics TKN = 1,100- treatment process NH4 = 1,300-1,400 TKN=1,440 mgtL NH4 = 1,400 mg/L 1,200 mg/L mgtL P=8 mg/L P = 9-10 mg/L COD:CBOD5 not known Conveyance Options The Leachate Study addresses two alternate forcemain routes from the Waste Management facility to the Elk River Collection System. Option 1 is approximately 4.0 miles and follows Highway 169 while Option 2 is approximately 5.0 miles and follows a route along the Great Northern Trail Corridor. Estimate of probable construction costs range from $1.9 to $2.2 million for a 4 -in unlined forcemain. Recommendations Recommendations following the preliminary evaluation are consistent with the project plan outlined in the Memorandum of Understanding. The projected impacts on allocated treatment capacity and the uncertainty regarding the reduction of color and improved UVT through the biological treatment process should be tested with a pilot scale operation or via truck delivery and metered feed to the facility when the full scale activated sludge process is on-line. The pilot operations are scheduled for November 2015 following completion and start-up of the activated sludge treatment facilities at the Elk River Wastewater Treatment Facility. City of Elk River, Minnesota —121.109643 Page 4 Elk River/Waste Management Leachate Study Prepared by Bolton & Menk, Inc.