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b. The required soil treatment area shall be determined by the results of <br />the site evaluation and the design flow into the system. <br />The minimum soil treatment area required for any dwelling unit shall <br />be as follows: <br />Perc Rate Primary Field Alternate Field <br />1/2 to 30 MPI 600 Sq. Ft. 600 Sq. Ft <br />30 to 60 MPI d 800 Sq. Ft. 800 Sq. Ft. <br />The minimum soil treatment area required for multiple residential units <br />shall consist of the, sum of the areas required for each individual unit <br />multiplied by the number of units.to provide for primary and alternate <br />site. <br />Trench and bed size based upon flow rates shall be as follows: <br />4- Percolation Rate Per Gallon of Required Soil Treatment <br />(Minutes per Inch) Mlaste Per Day (b) Area Per Bedroom <br />. .... ............. <br />(Square Feet) (a) -(e) <br />Faster than ,1/2 - - <br />1/2 to 5 - 0.83 125 <br />6 to 15 1.27 190 <br />16 to 30 1.67 250 <br />[J 31 to 45 2.00 300 <br />• 46 to 60 2.20 330 <br />[ J (1) Area requirements as determined from table shall be provided in <br />both the primaiy and alternate sites. <br />t (2) When treatment system design -is based on gallons of waste per <br />day, the required treatment area may be reduced for trenches <br />only, by the following percentages: 20 percent for 12 inches <br />of filter material below the distribution pipe; 35 percent for <br />18 inches; and` 40. percent for 24 inches. • The filter material <br />shall completely encase the disposal pipes to a depth of at <br />C least one inch. <br />(3) Soil is unsuitable for a standard system if the percolation rate <br />is faster than 1/2 minute per inch or slower than 60 minutes per <br />inch. See Variance section for alternative systems that may be <br />considered. - <br />' 4. ABSORPTION TRENCH REQUIRDEM: The trench beds shall be not less than 18 inches <br />nor more than 36, inches wide. Trenches and beds shall not be more than 100 feet <br />I in length. The size and minimum, spacing requirement <br />s for treatment trenches is <br />as follows: <br />Width at Bottom <br />iIn Inches <br />Effective Absorption <br />Area in Square Feet <br />`Per Lineal 'Feet <br />1.3 <br />2.0 <br />2.5 <br />3.0 <br />-2 <br />1-inimum Spacing of <br />Lines, Center to <br />Center, In Feet <br />6.0 <br />6.5 <br />7.0 <br />7.5 <br />{ 18 <br />24 <br />I_ <br />30 <br />36 <br />Effective Absorption <br />Area in Square Feet <br />`Per Lineal 'Feet <br />1.3 <br />2.0 <br />2.5 <br />3.0 <br />-2 <br />1-inimum Spacing of <br />Lines, Center to <br />Center, In Feet <br />6.0 <br />6.5 <br />7.0 <br />7.5 <br />