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June 30, 1983 Job #i 1962 <br />Specifications, h300 Tayside Page 2 of 1t <br />TREATWIT AFEA: <br />A mound system treatment area will be constructed in the general location <br />shown on the attached location plan. The natural slope in this area is <br />approximately 6%. The mound configuration is indicated on the attached <br />General Mound Configuration sketch. Pertinent details are as follows$ <br />- ROCK BED. The rock bed shall be 61-8" wide by 60, long, placed on top <br />of the sand fill. 9" of rock shall be placed under the perforated <br />laterals and 2" of rock shall be placed on top of the perforated <br />laterals. The rock bed material shall be a clean rock, crushed igneous <br />rock, or similar insoluable, durable and decay resistant material, <br />free from dust, sand, silt, or clay. The size shall ran-e from 3A <br />inch diameter to 2 1/2 inch diameter. The rock bed shall be level. <br />- PERFORATED IA TERAL. The perforated laterals shall be 1 3A inch pipe <br />with 3/16 inch holes spaced 36 inches on center at the invert. Two <br />laterals will be installed, h0 inches on center and each 20 inches from <br />the edge of the rock bed. The perforated laterals shall be connected <br />by a 2" manifold pipe and shall be capped at the ends. The manifold <br />shall connect the perforated laterals either at one end or in the <br />center. The purpose of the manifold pipe is to distribute effluent <br />from the pumping chamber equally to the perforated laterals. Details <br />showing the manifold connection and can is sho:•m on the attached sketch, <br />"Tee to Tee Lateral - 'Manifold Construction". <br />S _ITD FILL. After preparation of the natural ground, a sand fill will be <br />placed as the base of the mound. The sand fill will extend at least <br />12 inches thick under the rock bed at its uphill location, and shall <br />be level with the top of tre rock bed, extending 18" beyond the rock bed, t <br />down on a 3:1 slope. The sand s;iall be composed by weight of at least <br />25% of very coarse, coarse, and medium sand varying in size from 2.0 <br />to 0.25 mni, less than 505, of fine or very fine sang ranging in size <br />between 0.25 and 0.05 mm, and no more than 10% of particles smaller than <br />0.05 mm. <br />RUITOFF DIVERSI)N. The mound shall be protected from surface runoff by <br />constructing a diversion dranage urhdli of the mound systen. The diversion <br />shall consist of cohesive fill extending 7 feet beyond the uphill side <br />of the mound at the center, uniformly extending, at the base, to the <br />corners of the mound as indicated on the attached General }'ound Config- <br />uration sketch. This diversion fill shall be compacted to 95% of the <br />standard proctor density according to ASV.: D-698, and shall form a <br />smooth surface to the top of the mound. <br />S10TY LOf�11 COVER. The sand fill and rock bed shall be covered vrith a <br />mound of loosly placed sandy loan fill, 12 inches deep at the center of <br />the rock bed and 6 inches deep at the edge of the rock bed, tapering <br />outvrard at a 3:1 slope. <br />TOPSOIL COVER. The entire mound and runoff diversion shall be covered <br />with 2 inches of topsoil suitable for growing grass. <br />?SOL COi,'�TRUCTION: <br />CO::.; C; ICI: A rubber -tired tractor nay be used for plok-ing or <br />disking, to prepare the soil surface but in no case shall a rubber -tired <br />tractor be used after the :,;;,rf ce preparation is co:�pleted. A cratitilcr or <br />track -type tractor shall be used for mound construction <br />TOM SMITH ASSOCIATES Inc <br />