Agenda - Council - 02/28/1984 - Laserfiche WebLink

Home

I I I I I I I i I i I I I i I I I I - 17 - 14. The filter mmterial shall be covered with untreated building paper or a two (2) inch layer of hay or straw or s~m~lar, approved permeable materials. 15. The trenches or beds shall be backfilled with the excavated material and slightly crowned above finished grade to allow for settling. The backfill s~all not be compacted to a density greater than that of the original soil. 16. The minimum depth of cover over the distribution pipes shall be at least eight (8) inches. The ~m~rimum depth of cover over the distribution pipes shall be no more than thirty-six (36) inches and preferably no more than twenty- four (24) inches. 17. A vegetative co~er shall be established over the soil treatment area. 150.014G FINAL TRFA2MENT AND DISPOSAL - ALTERNATIVE SYSTM4S Subd. 1 GENERAL The contents of this chapter apply to the final treatnmnt and disposal of the effluent of a system constructed in accordance with Chapter 150.014. The intent of this chapter is to provide sewage treatment solutions for those site or soil conditions where a st~mdard system cannot be installed or is not the most suitable type of sewage t~eatment system. Subd. 2 FLUCRIJATING GROUNII~kTER 1. Where natural drainage will not provide three (3) feet of separation between the bottom of the soil treatment area and the highest known or calculated level of the water table, agricultural drain tile may be used to intercept or lower the seasor~l high water table, except within shorelands of public waters. There shall be at least ten (10) feet of undisturbed soil between the sidewall of the soil treatment unit and the agricultural drain tile. 2. Within shorelands of public waters, agricultural drain tile may be used to intercept the seasonal high water table, provided the groundwater table has a slope of at least two (2) feet p er one hundred (100) feet toward the public water, and provided tim drain tile are installed upslope of the soil treament system. There shall be at least twenty (20) feet of undisturbed soil between the sidewall of the soil treatment unit and the agricultural drain tile. 3. In all cases, ~he greatest practicable vertical separation distance from the water table shall be provided. SUBD. 3 RAPIDLY PERMEABLE SOILS 1. Filter material for a soil treatment unit using gravity distribution of effluent shall not be placed in contact with original soil having a percolation rate faster than one-half (1/2) m~nute per inch.