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i, <br />8.3 0 Sewage disposal. systems <br />20. Sandy loam soil shall be placed on the filter material to a -� <br />depth of 1 foot in the center of the mound and to a depth of 6 ^� <br />inches at the sides. <br />21. A maximum of two 10-foot wide beds may be installed side by <br />side in a single mound if the soil percolation rate is between 5 <br />and 60 minutes per inch to a depth of at least 24 inches below <br />the sandy layer. The beds shall be separated by 4 feet of clean <br />^� <br />sand. <br />22. When two beds are installed side by side, the sandy loam fill <br />at the center of the mound shall be 18 inches deep and 6 <br />inches deep at the sides. <br />23. Six inches shall be placed on the fill material over the entire <br />r� <br />area of the mound. <br />24. A grass cover shall be established over the entire area of the <br />r <br />mound. <br />25. No shrubs shall be planted on the top of the mound. Shrubs <br />may be placed at'the foot and side slopes of the mound. <br />r� <br />! <br />26. The side slopes on the mound shall be no steeper than 3 to 1. <br />.� <br />27. Whenever mounds are located on slopes, a diversion shall be <br />�� 1 <br />constructed immediately upslope from the mound to <br />intercept and direct runoff. <br />28. A vertical inspection pipe at least 1-113 inches in diameter <br />must be installed in each drainfield rock layer of every <br />mound. The inspection pipe must have 3/8 inch or larger <br />perforations spaced vertically no mo: e than 6 inches apart. <br />At least two perforations must be located in the rock layer. <br />The inspection pipe must extend to the _bottom of the rock <br />r <br />layer and roust be capped flush with or above finished grade. <br />30. A pump must be used as specified in this Chapter (Refer to <br />Dosing Devices for Pressure Distributions). <br />r� <br />Subd. 8. 1990 Urban service area alternatives. <br />a. GeneraL Sanitary sewer service is expected to be available to <br />1 <br />portions of the 2000 Urban Service Area by 1990. The 2000 Urban <br />Service Area property owner shall remain responsible for <br />.individual waste disposal until such time that the sewer <br />connection is affected. Urban area lot dimensions tend to be more <br />restrictive for certain_ methods of waste disposal. It is the purpose <br />of this section to pro-,ide the urban service area with alternatives <br />to the longterm approach of individual waste treatment hereto <br />before outlined in this chapter. Such alternatives vrill allow for <br />"temporary" treatment until such time ti7at the property is <br />connected to the municipal sewer. Systems described herein are <br />Page 258 Printed 12/28/90 <br />AMO <br />