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<br />. <br /> <br />. <br /> <br />- 20 - <br /> <br />Due to uncertainties of whether the MWCC will continue to haul <br />the grit and screenings to commercial facilities or to its own <br />facility, it is recommended that the MWCC only pursue an option <br />on 50 acres of land at this time and only exercise that option <br />after the t~CC has shown that it is more economical for them to <br />haul the grit and screenings to their own landfill. <br /> <br />11 . <br /> <br />QUANTI!.!. AND Q!!!gTY Q!: ~~UDGE ANQ ~ <br /> <br />Tables 1 and 2 at the end of this report identify the quantities <br />of screenings, grit and sludge estimated for each plant during <br />1980 and for the next 20 years. Table 3 indicates the quality of <br />the raw slUdge before processing at each of the treatment <br />plants. Table 4 shows the quality characteristics of the <br />processed sludge and/or ash from Seneca, Blue Lake and the Metro <br />treatment plants. This data was calculated or measured based on <br />1978 sampling. Before purchase of land for landspreading the <br />exact quality at that time will be determined. <br /> <br />The quality of the ash generated at the Metro Plant even after <br />industrial pretreatment maybe a hazardous waste in accordance <br />with MPCA regulations. This is still speculative since the <br />existing construction program is not completed and the industrial <br />pretreatment program is not in force. Since the entire sludge <br />processing mode will be different in the future, no one can be <br />sure of 'the exact quality of the ash. Therefore, the quality of <br />the ash is based on the MWCC's best judgment at this time. As <br />currently indicated, if the ash is a hazardous waste by MPCA <br />definition it will be so because of its cadmium, chromium and <br />lead content. It has not been determined if the ash would be <br />hazardou~ in the future under EPA's definition of hazardous waste <br />(toxicity). By either definition ash currently is not classified <br />a hazardous waste. It is recommended that the MWCC and/or the <br />Council undertake the necessary studies to determine if. the ash <br />will be hazardous and if so what measures can be implemented to <br />mitigate its hazardous nature. If the ash is a hazardous waste <br />the siting responsibility can be turned over to the Waste <br />Management Board. However, until the ash is determined a <br />hazardous waste the Council will continue with its siting process. <br /> <br />5. <br /> <br />AMOUN! OF ~AND REQUIRED <br /> <br />The follOWing land areas ar~.required to implement the recommenda- <br />tions contained in this report: <br /> <br />o Me tro <br /> <br />226 acres for ash landfill <br />162 acres optioned for ash landfill <br />20,000 acres of private land for heat-dried <br />s lu dg e <br /> <br />o Seneca <br /> <br />32 acres for ash landfill, 19 acres optioned <br />for ash landfill <br />650 acres of private farmland for sludge <br />disposal <br />