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DocuSign Envelope ID:81E05E8E-EED7-43D3-8B8A-08110E72140A <br /> stable surface and secured. There shall be a 2'dam of undisturbed earth before a gravel trench <br /> begins. All other trench types per manufacturer. The pipe shall then be inserted at least 2'into <br /> the corrugated pipe. A cleanout to the ground surface shall be located at the end of the gravity <br /> pipe(the beginning of the drainfield)when the drainfield is over 50' from the tank. <br /> 5. The trench bottoms shall be smoothed and level with loose soil removed. <br /> 6. When necessary to change to a new contour, a step-down shall be constructed of a 2' <br /> undisturbed earth dam,which is raised to an elevation equal to the upstream gravel surface. <br /> However,precautions shall be taken to prevent raising the level of the effluent in the tank. <br /> Schedule 40 pipe (3"minimum) shall be used in crossing dams. Fittings will be needed to make <br /> the turns. The rigid pipe shall extend at least 2 feet into the level portion of the corrugated pipe. <br /> Area taken up by dams and step-downs shall not count as part of the footage required. <br /> 7. The soil cover over the drainfield shall be to a depth of at least 6". Boulders should be <br /> removed from the backfill material to prevent damage to the pipe. The finished grade shall be <br /> smoothed to prevent ponding of surface water over the drainfield. Surface water from upslope, <br /> including foundation and gutter drains, shall be effectively diverted away. <br /> 8. A vegetative cover of grass over the drainfield shall be established after final grading to <br /> prevent erosion. <br /> Installation and Testing Recommendations: <br /> I. A pre-construction conference is recommended to be attended by the installer and health <br /> department prior to beginning construction of the system. <br /> 2. For Accepted trench products use manufacturer's specifications. Installer should be <br /> certified by manufacturer. <br /> 3. The septic tank, dosing tank,risers and pipe penetrations shall be demonstrated to be <br /> watertight by a 24-hour leak test(no measurable leakage in 24 hours). The test shall be <br /> run with riser's inlet/outlet pipes installed. <br /> 4. Care shall be taken during installation to prevent extraneous debris from entering tanks, <br /> supply lines or distribution network. Supply lines and manifold shall be flushed prior to <br /> system start-up. <br /> 5. A pump delivery rate shall be measured and the floats adjusted according to the measured <br /> delivery rate to achieve the design flow at design head. All other mechanical <br /> components,pump(s),pump cycling, filters, etc.,as applicable must be demonstrated to <br /> be fully operable in accordance with their design. <br /> 6. Install water line, electrical lines and other buried utilities around septic and repair areas. <br /> 7. Keep repair areas free of parking and any future construction. Maintain grass cover over <br /> drainfield and repair areas to stabilize soil from eroding. <br /> 8. Proposed Septic Tank,Pump Tank and Pressure Manifold locations are at the discretion <br /> of the Health Department at time of the preconstruction conference. <br /> 9. Call NC 811 to mark any utilities prior to digging. <br /> Project# 320059 <br />