Laserfiche WebLink
§ &30 <br />(b) The invert of the inlet pipe shall be at least 1 inch higher <br />than the invert of the outlet pipe to the next trench. <br />(c) The invert of the outlet pipe to the next trench shall be at <br />least 2 inches higher than the invert of the outlet pipe of <br />the trench in which the box is located. <br />(d) When sewage tank effluent is delivered to the drop box <br />by a pump, the pump discharge shall be directed <br />against a wall or side of the box on which there is no <br />outlet. <br />(f) The drop box shall have a removable cover either flush <br />or above finished grade or covered by no more than 6 <br />inches of soil. <br />b. Pressure Distribution. <br />1. Pressure distribution laterals shall be sized as shown in <br />Table L <br />2. Laterals shall be spaced no further than 20 inches from a <br />trench or bed wall. <br />3. Laterals shall be spaced no further than 40 inches apart. <br />4. Laterals shall be connected to a header pipe which is at least <br />1-V2 and no more than 2 inches in diameter. <br />TABLE I <br />Maximum .Allowable Lateral Lengths In Feet From Header Pipe <br />Perforation Snacino <br />Perf. <br />Dia. <br />2.5Feet <br />Pipe Dia. <br />3.0 Peet <br />Pipe Dia. <br />1" <br />1-V4" <br />1-1/2" <br />1" <br />1-IJ4" <br />1-IJ2" <br />3/16" <br />34" <br />52 <br />70 <br />36 <br />60 <br />75 <br />7/32" <br />30 <br />45 <br />57 <br />33 <br />51 <br />63 <br />1/4" 125 <br />138 <br />150 <br />27 142 <br />154 <br />.. 5. Dosing <br />a. Dosing chamber. <br />1. The dosing chamber shall be watertight and constructed of <br />sound and durable materials not subject to excessive <br />corrosion or decay. <br />2. There shall be one or more manholes, at least 20 inches in <br />dimension, and preferably located directly above the dosing <br />device. The manhole shall extend through the dosing <br />chamber cover to final grade and shall be so constructed as to <br />prevent unauthorized entry. <br />Printed 12/28/90 Page 247 <br />