4.4. SR 03-20-2017 - Laserfiche WebLink

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SECTION 3.0 WASTE MANAGEMENT LEACHATE CHARACTERISTICS 3.1 Waste Management Leachate Collection and Storage Facilities Waste Management is located north of the current Elk River urban service area as indicated in Figure 1. The subgrade surface below the landfill cells slopes to allow leachate to be collected in a perforated high density polyethylene (HDPE) pipe and sump. On the west side of the landfill, leachate is pumped to a 30,000 gallon underground storage tank (UST). It is then pumped from this UST to a 225,000 gallon above ground storage tank (AST). On the east side, leachate is pumped to the Cell 10 manhole. From here it is pumped to a 10,000 gallon leachate load -out tank (UST) which pumps to the 225,000 gallon AST. Waste Management currently has truck load -out capabilities at both the 10,000 gallon UST and the 225,000 AST. Waste Management uses all HDPE piping and concrete manholes with stainless steel pumps and plastic or stainless fittings. A Waste Management fact sheet for this facility has been included as Appendix C. 3.2 Typical Landfill Leachate Characteristics Leachate is the liquid that passes through a landfill and results from precipitation and moisture that is present in the landfill contents. Landfill leachate is typically characterized by high values of COD, pH, ammonia and heavy metals as well as a strong yellow to black color and acidic or foul odor. As a landfill ages, the CBODs:COD ratio can be expected to decrease with initial ratios as high as 0.7 which decrease to ratios as low as 0.1. Leachate is often considered difficult to treat due to high ammonia and heavy metal concentrations. Technologies used for leachate treatment include 1) recycling or combined treatment with municipal sewage, 2) aerobic and anaerobic processes, 3) chemical and physical processes, and 4) membrane filtration. 3.3 Elk River Landfill Leachate Characteristics Leachate draining from the Waste Management Elk River landfill is monitored on a quarterly basis for general pollutants including chemical oxygen demand (COD), total suspended solids (TSS) and other general pollutants as well as metals, volatile organic compounds (VOCs), soluble VOCs. Quarterly leachate analysis for 2011-2014 are included in Appendix D. Table 4 City of'Elk River, Minnesota — T21.109643 Page 11 Elk River/Waste Management Leachate Study Prepared by Bolton & Menk, Inc.