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8 settling takes place under quiescent conditions) so no activated sludge is transferred to the next treatment step. The Bio-Pure 500EFO-1 system clarifier has an operating capacity of 10, 823 gallons, of which 3 , 607 gallons are supernatant volume and 7 , 215 gallons are sludge volume. Because 100% of this sludge volume is recycled back to the aeration chamber 14 times in every 24-hour period, and because of the low food-to-microorganism ratio maintained in the aeration chamber, total sludge digestion is very high and residual sludge production is very low. Sludge wasting of 5% or 361 gallons, of the clarifier sludge volume of 7, 215 gallons is performed whenever the SSV-60 test reaches 500 ml, which, based on systems now in operation, will probably occur during the second year of operation. Should sludge wasting become necessary, any portion greater than 5% of the clarifier sludge volume may be pumped out by a licensed septic-waste hauler and disposed of as required by law, or be placed in a small sludge drying bed or deposited directly around floral vegetation. There is no odor to this activated sludge. The above wasting procedure follows recommendations described by Dr. Kenneth D. Kerri and William Crooks in "Operation of Waste Treatment Plants" published by California State University, Sacramento, Department of Civil Engineering, in cooperation with the California Water Pollution Control Association for the Federal Environmental, Protection Agency, Office - of Water Program Operations. (Dr. Kenneth D. Kerri is professor of Civil Engineering at the above university. William Crooks is Executive Director of the California State Water Quality Control Board. ) Should you have any question, please feel free to call. Sincerely, ROSE'S ENGINEERING EOLOGY & SURVEY INC. Merw' F. Rose y; MFR:j r tj JJJ V