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least 6 inches of sand shall be kept under tlic tracks to minimize compaction of the scarified <br />layer. The sand layer upon which the filter material is placed shall be level from side to side and <br />end to end. Only clean sand is to be used. A depth of at least 9 inches of clean rock I 1/4 inch <br />diameter to 2 1/2 inches in diameter, shall be placed on the sand layer prior to installing the <br />distribution pipe. <br />Pressure Distribution <br />Effluent shall be distributed over the filter material by a 2 inch diameter perforated pipe under <br />pressure. Perforation holes shall be 1/4 inch in diameter drilled in a straight line along the length <br />of the pipe. Hole spacing shall be 36 inches. 1 loles shall be drilled straight into the pipe and not <br />at an angle. A sharp drill shall be used and any burrs in the inside or outside of the pipe shall be <br />removed. The perforated pipe laterals shall be installed level with the perforations downward. <br />The perforated pipe laterals shall be connected to a 2 inch diameter manifold pipe and shall have <br />their ends capped. The laterals shall be spaced no further than 40 inches on center and no further <br />than 20 inches from the edge of the filter material. <br />The manifold pipe shall be conneeted to the supply pipe from the pump, fhe manifold shall be <br />sloped toward the pump for complete drain back of effluent. <br />Pump and Collection Tank <br />A pump shall be used to deliver eniucnt to the mound. The pump shall be cast iron or bronze <br />fitted with stainless steel screws or constructed of other wound, durable and corrosion-resistant <br />materials. Location of pump tank and septic tank can be optional due to the use of a pressurized <br />mound. <br />An alarm device shall be installed to warn of pump failure. The dosing chamber will be sized for <br />a minimum of 2 days of restricted use due to amount of daily use. <br />Pump Discharge <br />The pump discharge ca|xicity is based on the perforation spacing and (K‘rforation diameter. This <br />system has individual lateral lengths of 73 feet: laterals will be 2 inch plastic pi|x; with 1/4 inch <br />perforations spaced 36-inches apart. This size w ill require 6.2 C !*M |K*r 100 .square feet of bed <br />area. A 56 GPM minimum pump discharge capacity is required, fhe pump diseharge head shall <br />be at least 5 feet greater than the head required to overcome the pi|x: friction loss and the <br />elevation dilTerencc between the pump and the iKiforated laterals of the pressure distribution