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7. Allow the wastewater treatment plant to operate approximately one hour before <br /> conducting a mixed liquor settleable solids test in the aeration chamber. No <br /> more than 10% of the solids in the aeration chamber should be wasted at a time. <br /> Sludge should not be wasted twice in one day. <br /> 8. Be aware that sludge will eventually become so concentrated in the sludge <br /> holding tank that when the diffusers are turned off, very little clear liquid will <br /> appear over the sludge. When this occurs, the sludge holding tank should be <br /> pumped by a septic tank pumping truck for proper disposal, or the sludge should <br /> be pumped to drying beds. Only during extended periods, when the wastewater <br /> treatment plant is lightly loaded, can the sludge be returned to the aeration <br /> chamber (for example, at the end of the school year or at the end of camping <br /> season), providing complete oxidation of all organic material. After the sludge <br /> has been totally oxidized, the plant is then turned off until the next operation <br /> season. If for any reason the sludge holding tank is pumped, it should be <br /> immediately refilled with water to minimize any uplift pressures from groundwater <br /> in the surrounding soil. <br />