 the Porox (Hydrogen Peroxide) Pro- cess," in Proceedings of the Sixth National Conference on Individual Onsite Wastewater Systems (1980). National Sanitation Foundation, Ann Arbor, MI. Hill, W.F. "Rehabilitation of Onsite Systems," in Proceedings of the Eighth National Conference on Individual Onsite Wastewater Systems. National Sanitation Foundation, Ann Arbor, MI. Mellan, W.L. "The Need for Improving Septic System Repair Prac- tices," in Proceedings of the Third National Conference on Individual ONSITE WASTEWATER DISPOSAL Onsite Wastewater Systems (1977). National Sanitation Foundation, Ann Arbor, MI. Moreau, E.M. "Subsurface Wastewater Disposal Systems- Remedies and Prevention of Failures," in Proceedings of the Eighth National Conference on Individual Onsite Wastewater Systems (1982). National Sanitation Foundation, Ann Arbor, MI. Index Absorption capacity of soil. See Contact time, disinfectant, soil percolation 212-213 Actual effluent flow rate, 137 Clogging, 8, 99, 224 Alarm, 54-55, 163, 195 Cross connection, 207 Aerobic treatment unit, 10, 11, Chlorine 16, 135 forms, 212, 216 Additives to septic tank, 49-51 concentration, 213, 215-216 Age of system, 12, 224, 227 Design effluent flow, 16, 44, 108, Anaerobic digestion, 9 142, 143 Antisiphon hole, 54, 61 Disease, 2, 10 Appliances, watersaving, 232-234 Distribution box, 74, 99-100 Aquifer, See Ground water Diversion box, 10, 165 Bacteria removal, 10, 12, 13, 65, Dosing frequency, 56, 150, 166 Barrier material, 71, 73, 79-80, 94, siphon, 53-56 volume, 56, 150, 165 Bedrock clearance, 17, 32 Drip irrigation. See Trickle Baffles, 46-47 irrigation Behavior, watersaving, 232, 233 Drop box, 75 Biochemical Oxygen Demand, 10 Drainage. See Slope, land Biological mat, 1, 13, 66, 70, 155 Effective size, 158 Black water, 203-204 Efficiency Bottom area irrigation, 138 reduction, 83, 84 pump, 62 utility, 67-70 Effluent quality, 10, 11 Capillary action, 26-27, 176, Elevated sand filter, 155, 162-164, 179-180 170-171, 172-173 Check valve, 63 Emitter, 141-142 Clay, 20, 21, 83