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Both the Settling Tank and Polish Tank have inside dimensions of 8 feet by 26.75 feet by <br />4.75 feet with a total capacity of 1,000 cubic feet or 7,500 gallons. The tanks are double <br />lined with leak detection in the same manner as the Untreated Water Tank. <br />The projected reagent consumption and resulting sludge volumes can be found in Tables <br />3.1 and 3.2 below, for the maximum flow rate of 20GPM. If the formed precipitate does <br />not settle sufficiently within the Settling Tank, flocculent can be added to aid in the <br />settling process. Flocculent has been included in the sludge volume calculation, although <br />its use will probably not be required. The trailer has sufficient space to add this <br />additional reagent if deemed necessary. <br />Table 3.1 -Reagent additions and Precipitates formed <br /> <br /> <br />Rea ent or Metal Grams of <br />PPT per <br />da <br />Design dose <br />m /L <br /> <br />Assumptions <br /> <br />FeSo4 477.6 4.8750 Assume 90% Precipitation <br />BaCI 2,939.3 30 Assume 90% Precipitation <br />Floc 392.0 4 Assume 90% Precipitation <br />TDS 87.1 8 Assume 10% Removal <br />All metals 2.0 Assumed for safety factor <br />Total 3,898.1 g/day 8.6 #/day <br />During exploration activities, the water treatment plant will likely operate 7 days per <br />week, 24 hours per day for the first few months. After the mine is dewatered, treatment <br />plant operating times are expected to decrease to 60 hours per week or less. The sludge <br />tank capacity has been sized conservatively by assuming plant operation of 5 days per <br />week 24 hours per day. This is a much higher rate that the historical data indicates and <br />should result in a sufficient safety factor in the event of extended mine life or if additional <br />treatment requirements are imposed. <br />The mine has an anticipated life of 10 years of operation. The formed precipitate or <br />sludge will have a bulk density of approximately 44 Lb./CuFt. Assuming 8.6 Lb./day of <br />PPT, the volume of sludge generated over the life of the mine can be calculated as shown <br />in Table 3.2. <br />Table 3.2 -Sludge Generated <br />Plant Operations 5 days/week <br />24 Hr/ operating day <br />260 Total days of sludge production/year <br />Sludge Produced <br />2,234.3 Total #'s of Sludge per year <br />50.8 CuFt/ Year <br />Sludge production life of mine <br />22,343.4 Total #'s of Sludge <br />507.8 Total CuFt of sludge storage <br />10 <br />