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3. Construction Inspection. At a minimum, inspection of the PD trench system <br /> installation should include the items listed below. This is in addition to inspection <br /> work required for a supplemental treatment system, if used. Joint inspection by the <br /> designer, contractor, and CCEH may be required. <br /> • Pre-construction inspection where the construction staking or marking of the <br /> various system components is provided and construction procedures <br /> discussed; <br /> • Water tightness of septic tank and dosing (pump) tank; <br /> • Layout and excavation of dispersal trenches and piping; <br /> • Drain rock material and placement; <br /> • Piping installation and hydraulic ("squirt") test of the distribution system; <br /> • Functioning and setting of all control devices; and <br /> • Final Inspection to verify that all construction elements are in conformance <br /> with the approved plans and specifications, erosion control has been <br /> completed and operation and maintenance guidelines are provided for owner. <br /> F. MANAGEMENT REQUIREMENTS <br /> Recommended minimum procedures and frequency for inspection, maintenance, <br /> monitoring and reporting activities for pressure distribution trench systems are outlined in <br /> Table 1. <br /> 4 <br />