Agenda - Council - 08/08/1989 - Closed Executive Session and Regular Meeting

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Distribute the sewage tank effluent by pressure flow over the treatment area as specified in this chapter. Divide the total soil treatment area into at least four equal parts connected serially; or Ce Provide at least 12 inches of loamy sand textured soil with a percolation rate between six and 15 minutes per inch in situ between the drainfield rock and the coarse soils. Trenches must be used with this liner system. The size of the soil treatment system must be based on the required treatment area for a soil having a percolation rate between 16 to 30 minutes per inch as specified in Table II. Mounds 1. Mounds may be constructed on soils having the site or soil conditions specified in this Chapter. 2. The soil percolation rate in all layers of the natural or fill soil to a depth of at least twenty-four (24) inches below the sand shall be faster than one hundred twenty (120) minutes per inch. 3. The allowable absorption area loading rate must be determined according to Table III by the percolation rate of the 12 inches of original or fill soil immediately under the sand layer. TABLE III Percolation rate of original soil under sand layer, minutes Allowable absorption area loading rate gallons/day square feet per per square foot gallons per day 6 to 15 0.79 1.27 16 to 30 0.60 1.67 31 to 45 0.50 2.00 46 to 60 0.45 2.20 61 to 120 0.24 4.20 4. Below the sand layer, there shall be at least one (1) layer of soil, either natural or fill, at least twelve (12) inches thick, which has a percolation rate slower than five (5) minutes per inch (loamy sand). 5. Wherever possible, mounds shall be located on flat areas or crest of slopes. Mounds shall not be located on natural slopes of more than three per cent (3%) if the percolation rate is slower than sixty (60) minutes per inch to a depth of at least twenty-four (24) inches below the sand layer.