Agenda - Council - 01/13/1981 - Laserfiche WebLink

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- 19 - costs provided the basis for plan selection. Lime stabilization was eliminated because it is not a proven technology for large- scale application. Composting was eliminated because of uncertainty in marketing. Finally, incineration was eliminated because of air emissions. Anaerobic stabilization is, therefore, the only viable alternative. The MWCC recommended that the sludge be applied to property that the MWCC currently owns, 590 acres (Scottland Properties), and that an additional 140 acres adjacent to this property be purchased. This recommendation also included using 600 acres of private farmland in addition to the MWCC-owned property. As in the case of Empire, the Council will have to examine whether the Scottland Properties and the adjacent 140 acres meet the criteria before this site can.be selected for sludge disposal. . It is recommended that the MWCC construct anaerobic digestion and dewatering facilities at the Blue Lake plant. The MWCC-owned Scottland Properties and adjacent 140 acres will also be examined for compatibility with the criteria for land spreading of sludge. If these properties do not meet the criteria, a similar amount of land for the MWCC to purchase will be needed. . The reasoning behind the purchase of approximately one-half of the land needed is that there is some uncertainty in the continued use of private farmland because of the metals and PCB content of the sludge. Blue Lake, like Empire, does not have a back up system like Metro and Seneca (incineration). Therefore, to ensure land availability it is recommended that at least one half of the required land be purchased by the MWCC. In addition, there appears to be a demand for sludge from private farmers, therefore, it appears unnecessry at this time to purchase all the land that is needed for the next 20 years. The MWCC also recommended that thickened sludge from the Chaska and unthickened sludge from the Maple Plain plants be transported to interceptors tributary to the Blue Lake plant and unthickened sludge from the Savage plant be transported directly to the Blue Lake plant. This sludge would then be digested and landspread. It is recommended that the MWCC implement its recommended plan for the _Chaska, Maple Plain and. Savage plants after sludge processing facilities are operational at the Blue Lake plant. Grit ~nd Screening~ The MWCC recommends continuing to use commercial hauling and landfilling of grit and screenings. However, the MWCC should be prepared to conduct their own hauling and landfilling if less expensive than hauling and landfilling commercially. A MWCC landfill operation would require 50 acres during the next 20 years.