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j rCBast Tank Capacity(BTC) = 1,200 gals is ADF = 1,350 x 0.225 Soil Factor= 304 lineal t of achline(LFLL)required. e- 40 ft le chlines = 120 ft LFLL + 3 - 2x12 ft sumps 180 ft equivalent LL + 0 ft L 300 LFLL. The underlying soils possess increa ' sture content with increasing depth. High moisture content soils are beneficial for the suppression of nitrification, and the promotion of denitrification of nitrate molecules that may have formed through nitrification in the upper soil environments. 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 for leachlines and ten feet for sumps and seepage pits. The water table is approximately 75-85 feet below existing,grade. A 12-ft sump would provide an approximate 63-73 ft distance between the soil-effluent interface and thFNowat;tadepth. (§ lemicipated with the future septic system for the horse barn, other than conn engineered septic system will not have to be installed for thisprt e are continual failures,which is highly unlikely. It is important to recognize that all septic systems have a lifespan,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. Due to the porous subsurface materials (silts, sands and gravels), aerobic conditions may prevail over time which may increase the expectant life of the new leachfield. By installing the leachlines high in elevation, there will be a greater opportunity for oxygen intrusion from the atmosphere,thus theoretically assisting in biomat degradation, along with promoting evapotranspiration. Lifespan will also be dependant upon the efficiency of the septic system structures to manage effluent flows;/ which should be very small. In addition, soil moisture content of the subsurface soils will play an important role in septic system operational capacity. For example, if heavy rains are experienced in any given winter, subsurface l soil moisture content will increase,thus decreasing permeability. Page-5- Chesney Consulting