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.Wof <br /> F�and <br /> ffects under the filter bed should be of no concern since the saturated zone is at a <br /> pth to not influence percolation. <br /> d distance requirements as promulgated in the Sewage Standards must be followed, <br /> "as-buil " of the installed septic system should be supplied to the Environmental <br /> Health Department. <br /> It is important to note that all septic systems have a lifespan. This lifespan is dependant on <br /> several factors and is therefore difficult to determine. Therefore,the required secondary 100% <br /> replacement area must remain deemed as such, and should not be built upon, or used as parking. <br /> Several scientific studies have demonstrated that the infiltration capacity of a soil absorption <br /> system is dependant primarily by the formation of the biomat and not by the permeability of the <br /> soil. The biomat is a biological, slimy substance which forms on the soil-effluent interface over <br /> time. Hydraulic loading rates in equilibrium range from a conservative estimate of 0.125 <br /> gal/ft2/day to 0.5 gal/ft2/day. However, considering the apparent hydraulic conductivity of the <br /> indigenous surface soils to be 33.3 gallons/ftZ/day, even if the LTAR did approach 0.5 gal/ftl/day, <br /> there is still sufficient filter bed surface area(795 sq ft)to theoretically accept the ADF of 126 <br /> gals/day. <br /> L....Page -& <br /> Va(Iey Ag Research <br />