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Z <br />(5) The drop box shall have a removable cover <br />either flush or above finished grade or <br />covered by no more than six inches of soil. <br />B. By <br />Pressure Flow Over The Soil Treatment Area <br />-1. <br />Distribution pipe laterals used in trenches or beds for <br />pressure flow distribution shall be 1-1/4 inch diameter <br />pipe. <br />2. <br />A row of holes 3/16 to 1/4 inch in diameter shall be <br />C <br />spaced 36 inches apart in a straight line along the <br />axis of the pipe and laid to discharge downward. <br />[ <br />3.., <br />Laterals shall be spaced no further than 20 inches <br />from a trench or bed wall. <br />4. <br />Laterals shall be spaced no further than 40 inches <br />li <br />ap art . <br />[- <br />5. <br />Laterals shall be no longer than 50 feet. <br />6.• <br />*Laterals shall be connected to a header pipe which <br />[ <br />is at least 1-1/2 inch and no more than 3 inches <br />• <br />diameter. <br />