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8 . 9 . MOUNDED SYSTEMS <br /> 8 . 9 . 1 . A mound system is a soil absorption system that is <br /> elevated above the natural soil surface . The purpose <br /> of the design is to overcome site restrictions that <br /> prohibit the use of conventional soil absorption <br /> systems . Such restriction are slowly permeable soils , <br /> slowly permeable soils with high water tables , <br /> permeable soils with high water table . <br /> 8 . 9 . 2 . The mound system consists of a suitable fill material , <br /> an absorption area , a distribution network , a cap or <br /> cover and top soil . The effluent, is pumped or siphoned <br /> or gravity fed into the absorption area through a <br /> distribution network located in the upper part of the <br /> coarse aggregate . It passes through the aggregate an <br /> infiltrates the fill material . Treatment of the <br /> wastewater occurs as it passes through the fill <br /> material and the unsaturated zone of the natural soil . <br /> The cap , usually a finer textured material than the <br /> fill , provides frost protection and retains moisture <br /> for a good vegetative cover . The top soil provides a <br /> growth medium for the vegetation . <br /> 8 . 9 . 3 . Design of a mound system is to c^reform to the EPA <br /> Design Manual for On site Wastewater Treatment. and <br /> Disposal Systems , October 198(1 , except for the <br /> following exceptions <br /> a . Minimum size of the absorption area within the mound <br /> system .. <br /> 1 bedroom 2000 sq ft bed area <br /> 2 bedroom - 3(100 sq ft bed area <br /> 3 bedroom - 4000 sq ft bed area <br /> add 1000 sq ft, bed area for each bedroom <br /> above 3 . <br /> b . All individual homes will be required to install a <br /> minimum of a 19().() gallon tank with 80C► gallon lift <br /> station , (dosing chamber) , if system is under pressure <br /> from a pump . System shall have a back flow device <br /> installed between raised bed and lift station where <br /> applicable ; thus to prevent back flow when system is <br /> nearing total -saturation . Lift station must have an <br /> automatic alarm installed to warn home owner of lift <br /> pump failure . All wiring connections will be made <br /> outside of lift station in a water proof type <br /> electrical junction box . All wiring will be done under <br /> applicable permits from County or State agencies . <br /> 19 <br />