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. t The domestic well is on the opposite side of the house from the septic system. The PVC casing extends approximately one foot above grade. At present, there is no cap on this casing. It is r ecommended that a cap be placed over the top of the open casing until the pump is installed and the well completed. It is important to recognize that all septic systems have a lifespan, which is dependant on several factors and is therefore difficult to determine. 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 on the property consist of sand, silts, and some clays, aerobic conditions may prevail over time which may allow biomat formation to remain in equilibrium. Since the leachlines have been installed higher in elevation, there will be a greater opportunity for oxygen intrusion from the atmosphere, thus theoretically assisting in biomat degradation, along with promoting evapotranspiration. However, soil moisture content of the subsurface soils will play an important role in septic system operation and lifespan. For example, if heavy rains are experienced in any given winter, subsurface soil moisture content will increase dramatically, thus decreasing permeability. Heavy rainfall will also influence Old River, which in-turn will influence groundwater conditions, which will influence permeability. In unsewered areas and/or areas that have been, or currently are under agricultural production, it is highly recommended that bottled water be used for drinking and cooking purposes. Page -4- Chesney Consulting