Agenda - Council - 05/27/1997 - Laserfiche WebLink

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I I I '1 I I I I I I I I I I I I I I I 24. 25. 26. 27. 28. 29. 30. 31. Limited inorganic water quality data are available for private wells. From the available water quality data, it appears that the private wells sampled, whether bedrock, lower sand, or unknown screened position, are free of any impact from landfill operations (Remedial Investigation). Currently, no public health hazard exists and that limited potential exists for the occurrence of future hazards to public health. The results of the investigation have also indicated that site conditions are such that, through the application of available technology, water quality impacts in the vicinity of the Anoka Regional Sanitary Landfill can be effectively managed (Remedial Investigation). This facility is currently rated as a Iow priority on the PCA landfill rating list. Five surface water bodies located near the landfill have been sampled. These include an upgradient pond near well next MW-6 (SW-1), an upgradient Wetland near well nest MW-15 (8W-2), a downgradient wetland near well MW-20B (SW-3), a downgradient wetland location near well MW-35BB (SW-5); and Sunfish Lake east of well nest OViW- 18) (SW-4). No adverse water quality impacts have been detected in the surface water bodies (Remedial Investigation). The remedial objective is to reduce the concentrations of total VOCs, 1,2-dichloroethane, tetrachloroethylene, nickel, and zinc in the unconsolidated aquifer downgradient of the landfill. These parameters were selected, with the concurrence of MPCA, as indicator parameters, and are representative of the contaminants that will be encountered in the plume. The premise for this plan is that control of key selected parameters will assure control of their parameters as well (RAP - February, 1990). During the initial ten years of pumping when both flow barrier and groundwater recovery wells are operating, groundwater drawdown beneath Sunfish Lake is predicted to be between 1.5 and 4.5 feet. ARerwards, when only the flow barrier wells are operating, the drawdown beneath Sunfish Lake is predicted to be between 0.5 and 1.0 foot. In order to maintain the average elevation in the lake under both pumping situations, 11.4 and 2.8 gpm of replacement water would be required, respectively (RAP - February, 1990). That the Applicant has permits for groundwater appropriation and discharge to surface waters fi.om the State Department of Natural Resources and it was reviewed by the Department of Health, Anoka County, and the Lower Rum River Management Organization. That the use does not substantially, adversely impair the use, enjoyment or market value of any surrounding property. That the use is not unduly dangerous or otherwise detrimental to persons residing or working in the vicinity of the use or to the public welfare.