1994-006290 - replace septic - Laserfiche WebLink

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,George Funk October B, 1992 A depth of at 1,_a.st 9 inches of Clean rock 1 1/4 inch diameter to 2 1/2 i6ch s in diameter , shall be placed on the sand layer prior to installing the distribution pipe. Pressure Di.stri.buti -'n E=fflueni shall he d ' stributed over the filter material by a 1 1/2 itch diameter perforated pipe under pressure. Perforation holes sia]. 1 be 1/4 inch in diameter drilled in a straight line al'-'ng the length sof the pipe. Hole spacing shall. be 36 inches. ' H'a'les shall be drilled straight into the pipe and not at an angle. A sharp drill shall be used and any burrs in the inside or outside of the pipe shall be removed. The perforated pipe laterals shall be installed level with the perforations downward. The perforated pipe laterals shall be connected to a inch diameter manifold p .pe and shall have their ends capped. The laterals shall e spaced no further than 4':) inches on center and no furth !r than 20 inches front the edge of the filter material . The manifold pipe shall be connected to the supply pipe from • the pump. The manifold shall be sloped toward the pump for complete drain back ' c'f effluent . Pump and Collection Tank A pump shall be used to deliver effluent to the mound. The pump shall be '::ast . ron or bronze fitted with stainless steel strews or con tructed of other sound, durable and corrosion-resistant materials. Location of pump tank and septic tank can be lvtional due to the use of a pressurized mound. . An alarm device sha 1 be installed to warn of pump failure. The dosing chamber ill be sized fc'r a minimum of •days of restricted use due c amount ':'f daily use. Pump Discharge The pump discharge capacity is based on the perforation spacing and perforation diameter . This system has individual lateral lengths of 5'0 feet ; laterals will be 1 1/2 inch plastic pipe with 1/4 inch perforations spaced 36-inches apart . This size will require 7. 6 GPM per 100 square feet of bed area. A 36 GPM minimum pump discharge capacity is requirec . The pump discharge head shall be at least 5 feet greater than the head required to overcome the pipe friction loss and the elevation difference between the pump and the perforated laterals of the pressure distribution system, which is minimum of (see pump sheet ) i':'- foot head.