Laserfiche WebLink
<br /> <br />39 <br /> <br /> b. There must be at least 12 inches of original soil with a <br />percolation rate faster than 120 minutes per inch. <br /> <br /> c. Where the original soil has a depth of at least 12 inches <br />to the water table as the limiting soil characteristic, but <br />has a percolation rate of 5 minutes per inch or faster, a <br />layer of at least 12 inches of loamy sand textured soil <br />with a percolation rate between 6 and 15 minutes per <br />inch at the original site must be placed before placing <br />the sand layer of mound. The required absorption <br />width must be determined for a soil having a <br />percolation rate between 16 and 30 minutes per inch. <br /> <br />d. The allowable absorption area loading rate must be <br />determined according to Table VI by the percolation <br />rate of the 12 inches of original or fill soil immediately <br />under the sand layer. <br /> <br />TABLE VI <br />Percolation <br />Rate of <br />Allowable Absorption Area <br />Loading Rate <br />Original soil <br />under sand <br />layer, minutes <br />per inch <br />Gallons per <br />day per square <br />foot <br />Square feet <br />per gallon per <br />day <br />6 to 15 0.79 1.50 <br />16 to 30 0.60 2.00 <br />31 to 45 0.50 2.40 <br />46 to 60 0.45 2.67 <br />61 to 120 0.24 5.00 <br /> <br /> <br /> e. The required absorption width of mounds constructed <br />on ground sloping from zero to 2.9% must include the <br />width of the rock layer plus a distance measured <br />between the outer edges of the upslope and the down- <br />slope banks. The require absorption width for mounds <br />constructed on ground sloping between 3% and 12%