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CONCLUSIONS The perc test results for Lots 1, 2, 3 and 4 show acceptable percolation for the management of r"'septic effluent flows that can be expected at the maximum and typical leachline depth of 42 inches. There was evidence from the perc tests that percolative capacity decreases slightly with soil saturation within the soils of the subject lots. The EHD requires that there be sufficient distance for"treatment' of septic effluent before it encounters the groundwater table. This distance is normally regarded to be five feet. Therefore, sufficient distance exists between the bottom of a typical leachline depth of 42 inches and the current groundwater depth of 25 feet. It is recommended that r f ltrat rm ('hamherc,ciLn „sidered fir insWlation for the new septic systems on each lot to keep the soil/effluent interface as high in elevation as possible and to take advantage of the evaporative and e. evapotranspiration capacity during favorable weather conditions throughout the year. The actual c number of auu..Chambors or.eonventionaU d se tic tank sizes are unknown at 1 is time since the number of bedrooms for each structure is unknown, a ong ��_ P or a second unit dwelling. Each new system must have at least a 50% standby replacement area incorporated into the design and all related septic system structures and the new domestic wells must comply with the published "distance" requirements from property borders, roads, irrigation fields and irrigation #4 ditches, etc. It is recommended that a larger replacement area be designated since it appears from 1 the Repairs/Addition permit data tha septic systems ave a e mte r espan in this locale. is &_e' important to note t at all septic systems ave a i espan,which is dependant on several factors and is therefore difficult to determine. Septic system leachline failure would primarily result from the advanced formation of a"biomat" or"clogging mat' on the wetted soil/effluent interface. This mat is composed mostly of aerobic and anaerobic bacteria and bacterial products consisting of a slime of polyuronides and polysaccharides. If the soil/effluent interface is well aerated, a variety of soil microfauna such as nematodes and protozoa may digest the clogging mat bacteria. Since the shallow subsurface soils consist of a sandier grained soil material, aerobic conditions may prevail over time which may extend the life of the leachfield. If the Infiltrator leachlines are installed high in elevation, there will be a greater opportunity for oxygen intrusion from the atmosphere, thus theoretically assisting in biomat degradation. n7:7ho he nitrate concentration ultimately tested for in each of the new domestic wells, uld always be used for drinking and cooking purposes. Chesney Consaking