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FINAL GROUND SURFACE <br />J, J, <br />L'A A-V : <br />O O O O O <br />C . �<<. c • t. <br />MINIMUM ROCK <br />C. �� DEPTH I <br />� S 6" <br />6" OF SOIL COVER <br />ct N <br />O O O O O • <br />C. <br />.� .f�2" <br />C•C4• OF ROCK <br />c' <br />C f�• � <br />c�c c: ` C'c• C• <br />BOTTOM OF TRENCH -� <br />MINIMUM <br />DISTANCE <br />TO FINISH GRADE IS <br />4.5 FEET <br />( THIS COULD <br />BE 3.0 FEET OF <br />ORIGINAL <br />SOIL AND 1.5 <br />FEET OF <br />FILL) <br />MINIMUM DISTANCE IS <br />3.0 FEET OF SOIL <br />SUITABLE FOR TREATMENT <br />OF SEWAGE TANK <br />EFFLUENT . <br />SEASONALLY SATURATED SOIL <br />OR IMPERVIOUS LAYER <br />MINIMUM DEPTH AND SEPARATION REQUIREMENTS FOR <br />DRAINF'IELD TRENCHES OR SEEPAGE BED <br />DETAIL 17 <br />