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e. Shut-off Valves. The distribution lateral for each trench shall be fitted <br /> with a shut-off valve to adjust or terminate the flow to individual trenches. <br /> This valve may be either a ball or gate valve, and shall be located in a <br /> utility/valve box. <br /> f. Lateral End Riser. The end of each lateral shall be fitted with a 900 long <br /> sweep to facilitate line cleaning and hydraulic testing. The end riser pipe <br /> shall also be fitted with a ball valve and/or threaded end cap or plug, <br /> housed in a valve box. <br /> 6. Pump System. The pump system shall be: (a) appropriate for sewage <br /> applications; (b) of the size and type to meet the hydraulic design requirements; <br /> and (c) designed and constructed in accordance with pump system requirements <br /> provided in this Manual. <br /> 7. Trench Sizing. PD trench sizing shall conform to the same sizing requirements as <br /> standard trenches, as applicable, per Part 2 of this Manual. <br /> E. ENGINEERING PLANS AND CONSTRUCTION <br /> 1. Reference Guidelines. In addition to the requirements set forth herein, design and <br /> construction of PD trench systems shall utilize applicable guidelines contained in the <br /> following references: <br /> a. "Onsite Wastewater Treatment Systems Manual", U.S. Environmental <br /> Protection Agency, February 2002 and as amended. <br /> b. "Design Manual — Onsite Wastewater Treatment and Disposal Systems", U.S. <br /> Environmental Protection Agency, October 1980. <br /> 2. Engineering Plans. Engineering plans for PD trench systems shall include: <br /> a. All relevant elevation data and hydraulic calculations; <br /> b. Specific step-by-step construction guidelines and notes for use by the <br /> installer; <br /> c. Erosion control plans for any site over 20% slope; <br /> d. Recommended make and model of all components; <br /> e. Recommended pump system components, with cut-sheet depicting float <br /> settings; <br /> f. Control panel programming; <br /> g. An inspection schedule listing critical control points; and <br /> h. Operation and maintenance guidelines. <br /> 3 <br />