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<br /> �;;�' , The total arca selected for the mound, including that under thc dik�,shall be roughened in on�3er ,
<br /> to thoroughly break up any existing sod laycrs and to provide a suitable transition zone betwecn
<br /> the original soil and sand laycr of the mound. The uea shall be roughened only whon the
<br /> moisture contcnt of the soil 8 inches below the surface is drier than the plastic limit.
<br /> s
<br /> Sutface preparation or roughening may be performed with a mald board plow, a disk plow, or
<br /> ' a back hce using only the teeth. Mold board plow furrows shall be at least 8 inches deep,shall
<br /> '�� be thrown up slope and shall run perpendicular to thc slope. T'hcre shall be no dcad furrow
<br /> under thc mound.
<br /> Disking may be used for surface preparation as a substitute for mold boazd plowing in soils
<br /> having percolation rates faster than 15 minvtes per inch (sandy loam) in the top S—inch depth.
<br /> .x
<br /> Back hce teeth may be used to roughen the soil surface and brcak up the sod layer. Care must
<br /> be taken so as not to compact or puddle deeper soil laycrs. In no case shall any surface soil be
<br /> excavated and removed frcm the area.
<br /> t3
<br /> Mound Construction shall proceed immediately after surface preparation is complcted. Every
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<br /> effort should be taken to prevcnt rain from falting on thc prepared soil surface.
<br /> CONSTRL'CI'fON MATERIALS AND PROCEDURES; DISTRIBUTION OF EFFLUENT:
<br /> A minimum of 12" of soil defined as sand shall be placed where the filter material is to be
<br /> locatcd. �crawler tractor with a blade or buckct shall be uscd to move the sand into place. At
<br /> least 6 inches of sand shall be kcpt under the tracks to minimize compacting of the plowed layer.
<br /> The sand layer upon which the filter material is placcd sha{l be Icvel.
<br /> Sand is defined a5 a soil texture composed by weight of a least
<br /> ,ri 25 percent of very eoarse, and medium sand varying in sizc from 2.0 to 0.25 mm, Iess than 50
<br /> percent of fine or very fine sand ranging in size betwccn 0.25 and 0.05 mm, and no more that
<br /> 10 percent of particles smaller that 0.05 mm.
<br /> ;� A minimum depth of 9 inchcs of filtcr material (rock) shall be placed on thc sand laycr prior to
<br /> :,�.
<br /> installing the distribution pipe.
<br /> Filter material is dcfinc�� as clean rock, crushed ignoous rock or similar insoluble, durable and
<br /> '`� decay—resistant material free from dust, sand, silt or clay. The siu shal[ range from 3/4 inch
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<br /> diameter to 2 12 inc}+ diamcter.
<br /> 'r PAGE 3
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