2016-00560 - septic replacement - Laserfiche WebLink

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, .. Site Evaluation Reporf-Sharr-att Design &Gompany Page 3 .'' �tto Job No. �5-0490 November 17, 2C?�5 CONSTRUCTI4N MATERIAI�S AND PR�CEDURES: DISTRIBUTIpN t3F EFFLUENT: - A minimum of 12 inahes of soil defined as sand shail be placed where the filter materiai is#o be located: A crawler tractor with a biade or bucket shall be used to move the sand into place. At least 6 inches of sand shall be kept under the tracks ta minimize compacting of the plowed layer. The sand layer upon which the filter mate�ial is placed shall be level. ' Sand �s defined as a'soil texture campased by weight of at (east 25 percent of very`coarse and medium same, vary'rng in size fram 2.Q to Q.25 mm, less than 50 percent of fine c�r very �ne sand ranging in size between Q.25 and Q.05 mm, and na more than:14 percent of particles smaller than 0.05 mm: A minimum depth af 9 inches of filter material (rock) shal!'be placed on the sand layer priar to installing the distribution pipe. Filter material is defined as clean rack, crushed igneous rock or similar insoluble, durable and decay-resistant material free from dust, sand, silt br clay. The size sha11 range from '!. inch diarneter.to 2'/z inch diameter. PRESSURE DISTRIBUTI4N: In each bed, the effluent shall be distributetl aver the �lter materi�l by' three 2 inch diameter perforated pipes under pressure 73#eet long. Perfaration holes shall be %d inch diameter drilled in a straight line along the length of the pipe. Hole spacing shall be 36 inches with 25 perforatians per IateraL Holes shall be drilled straight into the pipe and not at an angle. A sharp drill shall be used antl any burrs in the inside of the pipe shall be removed. The pertarated pipe laterals shall be installed level with the perforatians downward. The perforated pipe laterals shail be connected to a 2 inch diameter manifold pipe and shall haue #heir ends capped; ' The laterals sha0 be spaced 36 inches on center and at 20 inches from#he�dge of the filter materiaL The rnanifold pipe shall be connected to the supply pipe from the pump. The rnanifold shall be s{oped taward the supply pipe firom the pipe. Geo-textile material shalf be placed aver the filtsr rnateriaL ' Constnac#ion vehicles shall not be allowed an the filter material until backfill is placed. Sandy loam soil shall be placed on the filter mate�iaf to a depth af 12 inches in th+�cen#er of the: maund and to a depth of 6 inches at the sides. Six inches of#opsoil sk�all be placed on the fill material over the entire area of the mound: A grass cover shall be established over the entire area of the mound. No shrubs shaH k�e ptanted on the top of the mound. Shrubs may be placed at the foot and sitle slopes of the mound. The side slopes of the mound will be 3 feet horizontal to 1 faot vertical (3:1). The soil ma#erial at the tae of the dike should be slightly iess permeable or somewhat tighter than the na#ural soil belaw#he mound. This can be accomplished by selecting a#iner soil or by compaction. Whenever mounds are lacated on slope�, a diversion shall be constructed immediately up slope from the mound to intereept and divert runaff: 9 West Diyision Street; Bu�falo, MIV 55393 • 763-682-4727 • Fax 763-682-3522 • www.offaassc�ciates.com