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1 � <br /> F ' <br /> � k <br /> 7 <br /> TYPICAL TRENCH SYSTEM <br /> 3 <br /> Backfill <br /> if K <br /> (A�r ee i e1 <br /> Barrier Material <br /> - <br /> o e e e e ••. ,. . .rr <br /> i e e it s'�` _ � ? 3 1 .� 2 1/2 in. Rock <br /> 1 f t Mi n: e e e a e a >� <br /> 'c e e I � f� �•_ <br /> �: � ♦ t •--��?,7=jun ,s"� <br /> k <br /> :. 5 ft. Mien. 2 in'. Min. <br /> -- Perforated Pi e <br /> 24 in.. Min, Y <br /> Water Table or <br /> n Creviced Bedrock <br /> 12 in. Min. <br /> ' *� The percolation rate in the disposal area shall not be slower than P <br /> 60 minutes per inch. The percolation rate shall not be faster than <br /> 5 minutes per inch unless it can be shown that a sufficient distance <br /> of soil is available to assure proper filtration. <br /> * The import backfill material shall be similar to the natural seil and <br /> no more permeable. It should be mounded above natural grade to allow, <br /> settling and to channel runoff away from the system. <br /> t <br /> k , <br />