(A) Minnesota Rules. Those standards provided in Minnesota Rules, Chapter 7080, except with amendments authorized by this subchapter, shall be the basis for permit applications and issuance of permits, the conduct of inspections of work in progress, the issuance of notices of violation and notices of revocation of permits, except as otherwise provided herein.
(1) There shall be a four-foot thickness of soil separating the bottom of a sewage treatment system from limiting factors such as bedrock or water table. The soil shall have percolation rates ranging between 0.1 and 60 minutes per inch unless an alternative system is installed.
(2) Twelve inches of soil fill material with appropriate percolation rates shall be placed between the filter material and the original soil in the excavation when soil conditions have very fast or very slow percolation rates.
(3) Where Minnesota Rules allow sewage mound systems to be located on slopes, the mound shall be designed and constructed with sufficient base area to prevent seepage out of the mound. The base area shall be designed according to a calculated absorption rate of 0.24 gallons per day per square foot of base area.
(B) Support areas. Sewage treatment systems shall be placed in a designated support area. The least dimension of the support area running with the contour lines shall be a minimum of 50 feet. Support areas shall be located and sized according to the daily sewage flow and the slope as follows.
(1) For every proposed dwelling there shall be identified and preserved at least 5,000 square feet of support area for the soil treatment system if slopes do not exceed 6%. Where slopes exceed 6%, the support area size shall be determined by multiplying the percent slope times 1,000 square feet.
(2) For installations other than single-family dwellings, the appropriate size of support area shall be determined by multiplying the square feet of the soil treatment area times three and adding 10% for every percent slope that is more than 6%.
(C) Soils evaluations and construction designs. Soils evaluations and/or construction designs must be prepared by a Minnesota Licensed Professional Engineer, Hydrologist, Geologist, or Soils Scientist/Classifier, that is trained and experienced in soils evaluation and sewage treatment design and appropriately certified (or provisionally certified) by the Minnesota Pollution Control Agency for individual sewage treatment systems site evaluation and/or design when the following apply.
(1) The Soil Survey of Fillmore County published by the Soil Conservation Service, indicates that soils have severe restrictive features or when slopes exceed 20%.
(2) The sewage system proposed is designed for sewage flows that are apt to exceed 5,000 gallons in any 24-hour period.
(D) Multi-family residential, commercial, or industrial development. Proposed multi-family residential, commercial, or industrial developments that generate sewage wastes shall connect to a public sewage collection system properly operated in accordance with MPCA permits, unless otherwise authorized by the State Board of Health. All other residences and commercial establishments within the city that abut upon easements or streets where city sanitary sewer lines are situated shall likewise connect to the public sewage collection system.
(E) Non-water-carried sewage treatment/disposal methods.
(1) Homes or other establishments requiring sewage treatment facilities may utilize non-water- carried sewage treatment facilities. However, an adequate support area shall be located for future construction of a sewage drain field.
(2) The city shall have the right to review all proposed construction and issue permits for all non-water-carried sewage disposal and/or treatment methods. The wastes from these systems shall be treated and disposed of to protect the quality of surface or groundwaters and not become offensive, odor- producing, or serve as a source or attraction for flies, vermin, or rodents. Unsanitary conditions or nuisances caused by these devices must be corrected.
(F) Use and maintenance of sewage systems. No person shall use, operate, or maintain a noncomplying sewage treatment system. No person shall permit sewage effluent to spill upon or pool on the surface of the ground, or to enter a well, sink hole, fissured rock formation, or stream or river.
(Ord. 207, passed 6-23-1992) Penalty, see § 10.99