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(§ 6.'n As referenced above,problems and typical lifespan issues may be of a concern due to the <br /> referenced phenomena observed. Engineered septic systems will not have to be installed for this <br /> proposed subdivision unless there is a failure or continual failures. Each new system must have at <br /> least a 50% standby replacement area incorporated into the design of the septic system. All related <br /> septic system structures and the domestic wells must comply with the "distance" requirements from <br /> property borders, roads, irrigation fields and irrigation ditches, etc. <br /> It is important to recognize that all septic systems have a lifespan, which is dependant on several <br /> factors and is therefore difficult to determine. Septic system leachline failure would primarily result <br /> from the advanced formation of a"biomat" or "clogging mat" on the wetted soil/effluent interface. <br /> This mat is composed mostly of aerobic and anaerobic bacteria and bacterial products consisting of <br /> a slime of polyuronides and polysaccharides. If the soil/effluent interface is well aerated, a variety <br /> of soil microfauna such as nematodes and protozoa may digest the clogging mat bacteria. <br /> Since the shallow subsurface soils on the property consist of clays, anaerobic conditions may prevail <br /> over time which may decrease the expectant life of any new leachfield. Lifespan will be dependant <br /> upon the efficiency of the leachline trench and seepage pit structures to manage effluent flows. If <br /> the leachlines are installed high in elevation,there will be a greater opportunity for oxygen intrusion <br /> from the atmosphere,thus theoretically assisting in biomat degradation, along with promoting <br /> evapotranspiration. <br /> In addition, soil moisture content of the subsurface soils will play an important role in septic system <br /> operational capacity. For example, if heavy rains are experienced in any given winter, and if there <br /> is an irrigated crop planted, subsurface soil moisture content will increase, thus decreasing <br /> permeability. <br /> In unsewered areas and/or areas that have been, or currently are near agricultural production, it is <br /> highly recommended that bottled water be used for drinking and cooking purposes. <br /> Page -6- <br /> Chesney Consulting <br />