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,Sewage § s.3o of season~] high ground water table or bedrock closer than 3 feet to the ground surface And percolation rates faster than .$ or slower th~n 60 m~nutes per inch. Soil Classification is where soil particle sizes or texture's are specified in this regulation, they refer to the Guide for USDA Soft Textural Classification. Soil Treat~nent Area is sm area where sewage tank effluent is treated and disposed of below the ground surface by filtration and percolation through the soil sod also by evaporation, and includes those systems commonly ]~own as seepage bed, trench drainfield, disposal field, and also includes mounds and seepage pits. Sf~t~r]~rd System is an individual sewage treaknent system employing a sewage lmuk and the soil treatment system commonly tmown as seepage bed or trenches, draiu~eld or ]eachfield. Surface Water Flooding is the 100 year flood plain along rivers and streams as def~ued by'the D1WR or, in the absence of such data, the highest flood level of record; on lakes, high water levels as determined or recorded by the Department of Natural Itesources or, in the case of no DNR record, by local records or experience. Other surface water flooding 'or high water areas should be determined by local information. Valve Box is any device which can stop sewage taulr effluent from flowing to a port, on of the soft treatment area, hud includes but is not l~m~ted to caps or plugs on distribution or drop box outlets, divider boards, butterfly valves, gate valves or other mechanisms. Water Table is the highest elevation in the soil 'where all voids are filled with water, as evidenced by presence of water or soil mottling or other information. Seasonally It~gh Water Table is a perched water table or a saturated soil condition which occurs during wet seasons of the year. Nomal (or OrH~nary) ]Eigh Water Mark is a mark delineating the highest water level wtfich has been mainta~ed for a s~f~cient per~od of time to leave evidence upon the landscape. The normal high water mark is commonly that point where the natural vegetation changes from predominantly aquatic to predominsntly terTestr~al. Watertight is when constructed so that no external water can enter. Water Usage shall be estimated by the best current available data provided by the a~ency if actual measurements are unavailable. $.30.03 Per~ SubdivisionL No person, firm or corporation shall install, alter, repair or extend any inc]/vidual sewage disposal system in the City v~ithout first obtaining a permit therefore from the council or its authorized representative for the specific installation, alteration, repair or extension, and at the time of app].ving Printed 12/28/90 Page 239