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• <br /> TABLE 3 <br /> Size and Minimum Spacing Requirements for Disposal Trenches <br /> Width at Effective absorption <br /> bottom in area in Minimum spacing of lines <br /> inches Sq. feet per lin. ft. c to c in feet <br /> 18 1. 5 6. 0 <br /> 24 2. 0 6. 5 <br /> 30 2. 5 7. 0 <br /> 36 3. 0 7. 5 <br /> Absorption trenches or beds wider than thirty-six (36) inches shall <br /> be provided with multiple distribution tile lines spaced not more <br /> than thirty-six (36) inches nor less than eighteen (18) inches on <br /> center, and not more than eighteen (18) inches from the side walls <br /> of the trench or bed, except that where tile lines are supported on <br /> a satisfactory under-drain system these spacings may be increased. <br /> (b) Pipe used for the line between the septic tank <br /> and the distribution box and between the <br /> distribution box and tile laterals to the point <br /> where the laterals are separated six (6) feet, <br /> shall be vitrified clay, cement-asbestos, or <br /> cast-iron. Joints in such pipe shall be water- <br /> tight. Pipe used under driveways or other <br /> areas subject to heavy loads shall be bell <br /> and spigot cast-iron with leaded caulked joints. <br /> Such water-tight sections laid in the disposal <br /> field shall not be considered in determining <br /> the effective absorption area. <br /> (c) Clay or concrete tile used in the disposal <br /> field shall be minimum four (4) inch <br /> agricultural drain tile twelve (12) inches <br /> in length and shall be laid with 1/4 <br /> inch open joints. Alternate materials may be <br /> used if equivalent performance is indicated. <br /> -14- <br />