Site work for a civil project in Buxton, North Carolina. Completed plans call for site work for a water / sewer project.

The National Park Service (NPS) Cape Hatteras National Seashore (CAHA) has a requirement to replace the septic tank and drain field at Quarters 326 on Loggerhead Lane in Buxton, NC. The address for the project site is 46214 Loggerhead Lane Buxton, NC 27920. Replace the septic system with a new septic system. New septic system shall be installed by a qualified installer according to North Carolina General Statues, 15A NCAC 18A, and the North Carolina Building Code/Plumbing Code/Electric Code. 1. Submit product data for products to be used during this project. 2. Locate and mark utilities on site within the construction limits. a. Verify that newly installed fiber optic lines have been located via tone device. b. Verify abandoned electrical lines are disconnected and dead. c. Verify the depth of the water table below existing grade at the site of the proposed bed system. d. Verify the exact location of the water line providing water service to the DKQ. e. Hand dig to find the new fiber optic telecommunications line installed to the DKQ. f. Hand dig at any crossing of existing utilities to remain with the demolition work and new work for this project. g. Damage caused to existing utilities which were not located by the Contractor shall be replaced at the Contractor's expense. Replacement material shall be installed to the nearest utility pedestal or node. Patches/repairs shall not be accepted to damaged communications utilities. h. The contractor shall coordinate with each utility provider (including NPS for NPS owned utilities) prior to digging. i. The contractor shall coordinate with the CO/COR prior to digging. The COR shall be notified verbally 24 hours prior to digging. j. The Contractor shall not begin digging without written consent. 3. Protect the existing walkway, new fencing around the PKQ/DKQ, and sodded landscape. Provide protection measures to prevent cracking the edges of the walkway, cause rutting of the soils, or other damages to the project property. 4. Empty existing septic tank from all solids and fluids. 5. Demo existing concrete septic tank and associated piping from the septic tank back to the penetration through the floor of the DKQ, leaving approximately 4" - 12" below the floor to connect new pipe. 6. Demo existing lift station and valve vault. 7. Demo and disconnect all electrical wiring from the lift station back to the electric panel. Install blank breaker plates on the panel. 8. Demo the existing abandoned electrical lines below ground for approximately 60 ft between the DKQ to at least 5 ft past the new septic system. See sketch for details. 9. Provide new schedule 40 PVC white drainpipe connecting to existing septic pipe beneath the floor of the DKQ, turning and elevated, supported by earth and hangers beneath the DKQ. Provide a new short or long sweep elbow for vertical to horizontal fitting meeting NC Plumbing Code 706.3. Provide WYE fitting and extension to the edge of the building for cleanout with PVC cap. New pipe shall be elevated approximately 6 inches - 18 inches above existing grade, exiting the crawl space of the building toward the east as shown in the attached sketches. Cover pipe at least 8 inches outside the footprint of the crawlspace with soil. Reuse of soil from site excavation is acceptable. Grade at 5:1 slope on side slopes. Top 6 inches of cover shall be topsoil. Rake smooth and place sod over the raised area above the pipe. 10. Provide new 1,000-gallon concrete septic tank. Locate new tank on the north side of the DKQ in the location shown in figure 3 below, approximately 10 ft from the DKQ. (See attached sketches of proposed layout of new drainfield). a. Install septic tank with top of tank approximately 8 inches - 12 inches above existing grade. b. Connect new drainpipe to new septic tank with schedule 40 PVC or approved equal material. c. Provide properly sealed joints and connections from the existing drainpipe to new sections of pipe which seal to the new septic tank. d. Cover tank at least 8 inches outside the footprint of the crawlspace with soil. Reuse of soil from site excavation is acceptable. Grade at 4:1 slope on side slopes. Top 6 inches of cover shall be topsoil. Rake smooth and place sod over the raised area above the pipe. 11. The new 1,000-gal septic tank shall include at a minimum: a. Watertight joints b. Concrete baffles c. Effluent filter d. Access opening less than 18 inches from the end of the tank to visually see the inflow pipe. e. Adequate opening less than 12 inches from the effluent filter to be able to visually see and physically reach the effluent filter without entering the tank. f. Access opening to visually see the concrete baffle. g. Provide Concrete lids on the concrete septic tank with type 316 stainless steel handles. Concrete tanks with risers do not require concrete lids with stainless handles if the HDPE risers and riser lids meet State requirements for lids. h. HDPE risers and riser lids which extend a minimum of 12 inches above grade. Plastic riser lids shall be locking, mechanically sealed, or above 65 lbs. weight. 12. Provide new distribution tank and bed system drainfield. Follow 15A NCAC 18E paragraph .0903 BED SYSTEMS. a. Use #5 washed stone with no fines, 12 inches thick. b. Top of stone layer shall have filter fabric on top of stone, filter fabric extending approx 2 ft on all sides of the stone. c. Filter fabric shall be 9 inches below existing grade, and shall have 9 inches - 11 inches of soil placed above the filter fabric. The top 6 inches of soil shall be top soil suitable for placing sod. Top of soil at grade level shall be crowned 2 inches higher at the center of the drainfield sloping away from the center of the drainfield. d. Drainfield shall have 4 rows of 3 inch diameter perforated pipe set at 3 ft on center connected together inside of the washed stone with a minimum of 6 inches of stone below the pipe and minimum 2 inches of stone above the pipe. e. Provide additional fill material to grade site to fill excavations of old tank, lift station, and valve vault, cover over new tank and drainpipe, and crowned drainfield. Top 6 inches of cover material shall be top soil. 13. Provide sod to the disturbed area including pipe from the DKQ to the new tank, above the new tank, and above the drainfield, approximately 500 sf. 14. Re-establish the landscape grade due to rutting caused by vehicles and equipment accessing the site. a. Where vehicles and equipment have driven into the site, through the fenced area, and around the site, causing rutting or soil disturbance, smooth, fill, repair, or otherwise bring the grade back to original grade level. Re-sod ruts of destroyed vegetative grasses to pre-construction condition.