Orange County NC Website
Browse       Search
6" branch tee. Unless otherwise specified, the backfill around <br /> hydrants shall be thoroughly compacted to the final grade <br /> immediately after installation in order to put the hydrant into service <br /> as soon as practicable. Not less than seven (7) cubic feet of clean <br /> crushed stone shall be placed around the base of the hydrant to <br /> insure drainage of the hydrant barrel. A cap block shall be set under <br /> the fire hydrant foot for a solid bottom. <br /> 5. Air Relief Valves: Each air relief valve shall be installed at the exact <br /> location shown in a precast concrete manhole as shown in detail on <br /> the plans. Manhole sections shall be set plumb and on a firm <br /> foundation. Each joint between sections and all wall openings shall <br /> be sealed inside and out with a 2:1 sand-cement mortar and made <br /> watertight. When so directed, the Contractor shall install a flat slab <br /> top, precast with a standard frame and cover. Flat slab tops shall be <br /> traffic bearing. <br /> C. Backfilling and Compaction: <br /> 1. Backfill trenches immediately after approval of the pipeline <br /> construction. <br /> 2. Roadways and Road Crossi Use select backfill placed in uniform <br /> layers not exceeding 6" in thickness for full trench depth and width, <br /> thoroughly compacted with mechanical tampers under optimum <br /> moisture conditions to 95% compaction (100% for the top 2'-0" of <br /> subgrade beneath pavements). Replace removed paving and base <br /> course with new material of equal or better quality and of the same <br /> texture and color as the adjacent roadway. <br /> 3. All backfill shall be compacted so as not to damage the pipe and <br /> appurtenances and shall be compacted to 95% of the Standard <br /> Proctor Test (100% for the top 2'-0" of subgrade beneath <br /> pavements) for the various types of backfill material. Methods of <br /> backfilling shall be in strict accordance with the pipe manufacturer's <br /> recommendations. All backfill material shall have been approved by <br /> the Engineer. Select backfill material shall be used when requested <br /> by the Engineer. <br /> 4. Care shall be taken during backfill and compaction operations to <br /> maintain alignment and prevent damage to the joints. The backfill <br /> shall be kept free from stones, frozen lumps, chunks of highly plastic <br /> clay, or other objectionable material. All pipe backfill areas shall be <br /> graded and maintained in such a condition that erosion or saturation <br /> will not damage the pipe bed or backfill. <br /> Rev. 10/22/01 PROJECT#13.01126 02640-Page 12 <br />