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The desiccant absorber-contacting process must be scaled up from its relatively small commercial basis to the very large volumetric flow rates of power plant flue gases to result in economically acceptable equipment . The question is not whether a hypothetical future risk , which is to be avoided by a particular norm in a legal instrument , justifies adding an additional legal basis to that legal instrument . The program may be taken on a full-or part-time basis to serve the participant 's individual needs . Explaining the above theoretical basis to students would neither be easy nor a convincing argument that it is worthwhile for them to teach the class . First , EPA effluent limitations regulations require that discharges from coal mining operations be limited on a uniform national basis to not greater than 70 miligrams per liter daily maximum and 35 miligrams per liter daily average for total suspended solids and to an allowable pH range of between 6.0 to 9.0 .