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• These parameters were taken off of a standardized sewage strength chart for an <br />industrial facility. The BOD and strength will probably be lower due to the fact that a <br />majority of the employees will be working in the underground mine and will not have <br />access to the sanitary facilities except for showering. <br />Using the calculated hydraulic and organic loading rates, the plant was sized. As <br />can be seen on the plant component table in the Sanitary Design Calculations section, the <br />actual plant will be sized substantially larger than the calculated plant size. This is to <br />allow for possible surges in the system. The plant will consist of four main components; <br />an aeration chamber, clarifying tank, sludge holding tank, and chlorine contact tank. Two <br />(2) blowers will supply air to the aeration chamber. Both blowers are capable of producing <br />a total of 200 cfm .with one blower acting as a backup to the main blower. A mechanical <br />type sludge removal rake will be installed in the clarifier tank. The rake will scrape <br />sludge off of the tank walls and deposit it on the bottom of the tank. The sludge will then <br />be pumped to a holding tank at the inlet side of the plant. The chlorine contact tank is at <br />the effluent end of the plant. Chlorination tablets will be used to treat clarified water <br />prior to discharging into the stream. <br />• The plant which WFC plans to use is manufactured by Hydro-Aerobics, inc. of <br />Milford, Ohio. The plant has been sized so that there should be no problem meeting <br />secondary treatment limits which have been set by the Denver Planning and Standards <br />Section of the Colorado Department of Health. Figure 5 shows a typical H-200 plant <br />which WFC will purchase once the Colorado Department of Health approval is received. <br />The actual purchased plant, however, will have a circular clarifying tank with a rake arm. <br />Sewerlines were sized for the peak flow from the industrial building. Eight inch <br />PVC pipe is to be used for influent and effluent lines. A 6 inch line will be used for piping <br />to the polishing pond. it is WFC's plan to use New Elk Pond Uo. 6 as a polishing pond. The <br />pond is used for make-up water for the nearby coal preparation facility, therefore, there <br />will be no discharge from this pond into the Purgatoire River during normal operations. <br />Piping to the pond is shown on Figure 4. <br />• <br />-2- <br />