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sewage until it can be transported to a point of <br />approved disposal. <br />19. "Impermeable ", with regards to soils, is a soil horizon <br />or layer having a vertical permeability less than one <br />(1) inch in twenty -four (24) hours and shall be <br />considered impermeable. <br />20. "Individual Sewage Treatment System" is a sewage <br />treatment system, or part thereof, serving a dwelling or <br />other small living or business unit, or group thereof, <br />which utilizes subsurface soil treatment and disposal. <br />21. "Lawn Area" is the area bounded by the dimensions <br />required for the proper location of the soil treatment <br />area. <br />22. "Mottling" is a zone of chemical oxidation and reduction <br />activity appearing as splotchy patches of red, brown, <br />orange and gray. <br />23. "Mound System" is a system where the soil treatment area <br />is built above the ground to overcome limits imposed by <br />proximity to water table or bedrock, or by rapidly or <br />slowly permeable soils. <br />24. "Percolation Rate" is the time rate of drop of a water <br />surface in a test hole as specified in Section <br />(Final Treatment And Disposal — Standard System) of this <br />chapter. <br />25. "Plastic Limit" is soil moisture content below which the <br />soil may be manipulated for purposes of installing a <br />soil treatment system and above which manipulation will <br />cause compaction and puddling. If a fragment of soil <br />can easily be rolled into a wire one - eighth (1/8) inch <br />in diameter, the moisture content is above the plastic <br />limit. If the soil is dry enough to be friable and <br />falls apart when rolling it into a wire, the moisture <br />content is below the limit and the soil may be <br />manipulated. The standard method of determining the <br />plastic limit is specified in American Association of <br />State Highway Officials (AASHO) Designation #T 90 -61. <br />26. "Sand" is a soil texture composed by <br />, of <br />coarse, twenty - five per cent (25%) of very yo <br />medium sand varying in size from two (2) to 0.25 mm, <br />less than fifty per cent (50%) of fine or very iand <br />ranging in size between 1.25 and 1.05 mm, <br />than ten per cent (10%) of particles smaller than 0.05 <br />mm. <br />27. "Seepage Pit" (or leaching pit or 'dry well) is an under- <br />ground pit into which a sewage tank discharges sewage or <br />