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RECOMMENDATIONB: <br /> We recommend a mound system for your site and we have attached <br /> design calculations, a bill of materials and a site plan sketch <br /> of the system. The details of the system layout are as follows: <br /> Protection - Care must be taken to avoid driving on the <br /> mound area. You should rope off the mound area to prevent <br /> construction traffic from traveling over and compacting the <br /> soil which will make the site unusable for a disposal <br /> system. <br /> Piping - A 2" pipe from the pump to the center or end of the <br /> mound will connect to a 2" manifold pipe as shown in <br /> attached detail E12 or E15 and shall be frost proofed as <br /> shown in detail F17 where less than 4 feet of cover is <br /> provided. This pipe shall be the first thing installed. <br /> Preparation - With a tractor backhoe sitting outside the <br /> mound area, the surface of the mound area shall be broken up <br /> using the teeth of the bucket. <br /> Washed sand - Deliver truck loads of washed sand outside of <br /> the mound area leaving the mound area roped off during sand <br /> delivery. The quantity of washed sand required is listed in <br /> the bill of materials. Use a track mounted tractor with <br /> bucket to lay a one foot layer of sand minimum in front of <br /> the tractor to act as a cushion for the tractor to ride on <br /> while spreading the sand over the mound area. The completed <br /> top of the sand shall be level and shall be the minimum sand <br /> layer thickness specified on the design sheet. Outside the <br /> rock bed area, slope the sand downward at a 4 horizontal to <br /> 1 vertical slope from the top of the rock bed to the <br /> existing surface. <br /> Rock bed - The dimensions of the rock bed are listed on the <br /> design sheet and the number of tons of rock are listed in <br /> the bill of materials. The clean, 3/4" to 2 1/2" rock shall <br /> be placed atop the level sand surface. Do not drive on the <br /> sand to deliver the rock. One way of delivering rock is <br /> with a "ready-mix" truck with a long enough chute but the <br /> truck must be thoroughly cleaned before loading rock so that <br /> no cement remains. <br /> Piping - When 8 inches of rock is in place, connect the manifold <br /> to the existing pump line and assemble laterals as shown in <br /> details E12 or E15 and E14 on top of the rock. The size, lengths <br /> and numbers of these laterals and perforation size and spacing <br /> are shown in the attached design and bill of material sheets. <br /> Then complete the rock placement with the remaining 4 inches of <br /> rock. <br />