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v � <br /> F <br /> eptic system structures and the new domestic well for the Parcel must comply with the <br /> quirements from property borders, roads, and irrigation ditches, etc. As referenced, the <br /> vineyard is drip-irrigated, so there should be no inundation concerns. <br /> t 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 fine sands and silts, aerobic conditions <br /> may prevail over time which may increase the expectant life of the new leachfield. Lifespan will be <br /> dependant upon the efficiency of the leachline trench structures to manage effluent flows. If the <br /> 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, subsurface <br /> soil moisture content will increase,thus decreasing permeability. <br /> The south domestic well is the older of the two domestic wells and probably very shallow, thus <br /> drawing water from the top aquifers. This may be the reason that the nitrate concentration is higher <br /> than in the newer, assumed deeper north well. <br /> In unsewered areas and/or areas that have been, or currently are under agricultural production, it is <br /> highly recommended that bottled water be used for drinking and cooking purposes. It is my <br /> understanding that the Stokes' use bottled water for these purposes. <br /> Page -6 �j <br /> - <br /> Chesney Consulting <br />