Agenda - Council - 10/14/1997 - Laserfiche WebLink

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§ 8.30 Co Drainfield rock must not be placed in contact with original soll having a percolation rate slower than 60 minutes per inch. Subd. 7. Where the percolation rate of the original soft is slower them 60 rn~nutes per inch, at least 12 inches of fill m~terial having a texture defined as sand must be placed between the drainfield rock and the original soil along the excavation bottom. 5. Construction eqtdpment wheels or tracks must not be placed in contact with the bottom of the excavation during the con:_,truction of a soil treatment system in soils having a percolation rate slower than 15 minutes per inch. 6. The size of the soft treatment system must be based on an acceptance rate of 0,24 gallons per. square~ foot, which is equivsdent to a sizing factor of 4.2 square feet per gallons per day. Final treatment and d~.~posal - alternative sys~m~. General The conten~s of this section apply to the final treatment and disposal of the e/~luent of a system constructed in accordance with §8.30.4. The intent of this section is to provide sewage treatment solutions for those site or soil con~tions where a standard system cannot be installed or is not the most suitable t)-pe of sewage treatment system. Fluctua/ing gro,mdwa~er. 1. V~nere natural drainage veil] not provide 4 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 seasonal high water table, except v~th shore]~ds ~f-public waters. There shall be at least 10 feet of undisturbed soil between the sidewall of the soil treatment -c~t smd the agricultural drain tile. 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 2 feet per 100 feet toward the public water, and provided the drain tile are installed upslope of the soil treatment systenm. There shall be at ]east 20 feet of undisturbed soil between the sidewall of the soil treatment unit and the agricultural drain tile. In ali cases, the greatest practicable vertical separation distance from the watar table shall be proxdded. Rapidly permeable soii~. I I I I I I I I I I I I I I I I I Page 254 Printed 12/28/90