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§ 8~0 Filter mate:ia] for a soil treatment unit using gravity distribution of eft]uent shah not ~ placed in con,ct ~dth oH~n~ soils ha~ng a percolation rate faster than 0.1 ~ute per inch. For coarse so~s ha~ a percola~on rate faster than 0.1 ~nute per inc~, at least 12 ~es of lobby s~d textured so~ ha~g a pergola~on ra~ between 6 ~d 15 ~nutes per inch at ~e oH~n~ site sh~ be placed between the ~lter mateM~ ~ ~e coa~e soft sidew~ls. ~e size of the-Boll freedent system must be based on the req~red treatment ~ea for a soft ha~n~ a percola~on ra~ of 16 ~ 30 Table IL For softs ~ percola~on ra~s between 0.1 ~d 5 minutes per inch, at ]east one of ~e foHo~ treatment tech~ques sh~ be ~d: a) Dis~bu~ ~e sewage ~n~ e~u~t by pressure flow over ~e ~eat~ent ~ea as spewed ~ ~s chapter. b) D~de ~e to~ soft treatment ~ea into at least four eq~ p~ connected c) Pro. de at least 12 inches of lo.my sand text~ed soil ~th a percola~on ra~ between 6 ~d 15 ~uutes per ~ ~ si~ be~een the ~n~eld rock ~d the coarse - Bogs, ~enches m~t be used ~th tMs Hner system. ~e s~ze of the soft ~eatment system must be based on the requ{red treatment area for a soil havin~ a percola~on rate be~een 16 to 30 ~nutes per inch as spewed ~ Table ~. Mounds. 1. Mounds may be constructed on soils having the site or soil conditions specified in §8.30;04 Subd. 7. The soil percolation rate in all layers of the natural or fill soil to a depth of at least 24 inches below the ssnd shall be faster than 120 minutes per inch. The allowable absorption area loading rate must be determ{ned according to Table III by the percolation rate of the 12 inches of original or fill soil immediately under the sand layer. Printed lO_728/90 Page 255