A. Determination Of Hydraulic Loading Rate And SSTS Sizing: Table IX from Minnesota rules 7080.2150, subpart 3(E) entitled "loading rates for determining bottom absorption area for trenches and seepage beds for effluent treatment level C and absorption ratios for determining mound absorption areas using detail soil descriptions" and table IXa from Minnesota rules chapter 7080.2150, subpart 3(E) entitled "loading rates for determining bottom absorption area for trenches and seepage beds for effluent treatment level C and absorption ratios for determining mound absorption areas using percolation tests" are hereby adopted by reference as if fully set forth herein and shall both be used to size SSTS infiltration areas using the larger sizing factor of the two (2) for SSTS design.
B. Holding Tanks: Holding tanks may be used for the following applications only after it can be shown conclusively by the property owner that an SSTS permitted under this chapter cannot be feasibly installed:
1. As a replacement for an existing failing SSTS;
2. For an SSTS that poses an imminent threat to public health or safety;
3. For use with buildings with limited water use;
4. For collection of secondary discharge not suitable for on site treatment; or
5. For use with marina sanitary pump out facilities installed pursuant to subsection 10-13C-12B8b of this code.
C. Effluent Screens: When provided pursuant to Minnesota rules, part 7080.1930, subparts 2 or 3, effluent screens must be sized and utilized in accordance with the screen manufacturer's recommendations. The effluent screens must be of the nonbypass type and have certified documentation that shows at least three (3) years successful field testing and operation or that the screen meets the design standard for effluent screens in ANSI/NSF standard 46. The documentation must show the effluent screen has continuously lowered the total suspended solids by a minimum of thirty percent (30%) and that under normal use the screen is capable of obtaining a minimum of three (3) years between maintenance intervals.
The effluent screens must be placed within or following the last sewage tank or sewage tank compartment before distribution to the drainfield and be installed in accordance with the screen manufacturer's installation instructions. Effluent screens shall be properly cleaned, at the time of each tank pump out, by washing the screen waste into the septic tank or, if rinse water is not available, exchanged with a clean effluent screen. (Ord. 1219, 10-25-2010)