15-7 chlorine solution with between 50 parts per million and 100 parts per million in the initial
feed. If the chlorine level drops below 10 parts per million during a 24 hour period, then flush, refill with fresh chlorine solution, and repeat for 24 hours. Provide certified bacteriological and contaminant test results from a state -approved or state -certified laboratory. Operate all valves and controls to assure thorough sterilization. Testing, cleaning and sterilization shall be performed consecutively. Dispose of waste water in accordance with all environmental regulations. For short sections (less than 100 feet) and tie -in sections of water lines perform visual tests for leakage after installation instead of separate pressure and leakage tests. Sterilize according to AWWA C651 Sections 4.6 and 4.7. Provide an electronic copy of the test results to the Engineer and to the water line owner. Provide a hard copy to the water line owner as requested . Flush with clean water until the residual chlorine is reduced to the same level as in the existing water mains. Place new water lines into service after approval of all testin g and flushing and authorization by the Engineer. 1510 -4 MEASUREMENT AND PAYMENT __" Water Line will be measured and paid in actual number of linear feet of water line that has been incorporated into the completed and accepted work. Measurement of water line will be made by counting the number of joints used and multiplying by the length of the joint to obtain the number of linear feet of water line installed and accepted. Measurements of partial joints will be made along the length of the partial joint to the nearest 0.1 foot . The quantity of D uctile Iron Water Pipe Fittings will be measured and paid per pound based on the published weights for ductile iron fittings, exclusive of the weights of any accessories, as listed in the “DI Fittings Weight Chart” located on the Utilities Unit website . If the Contractor elects to use compact ductile iron water pipe fittings, measurement will be based on the weight of standard size ductile iron water pipe fittings. Any fitting not listed will be measured based on the published weights for ductile iron fittings listed in AWWA C110/A21.10. Any fitting not listed in AWWA C110 /A21.10 will be measured based on the published weights for ductile iron compact fittings listed in AWWA C153. This is li mited to pressure pipe 4 inches or larger. If the contract does not include such pay items, measurement will not be made and the work will be incidental to other contract pay items. Payment will be made under: Pay Item Pay Unit __" Water Line Linear Foot Ductile Iron Water Pipe Fittings Pound 1515 -1 DESCRIPTION Provide appropriate control devices, valves, meters, backflow prevention assembly and hydrants on water lines and force main sewers. 1515 -2 MATERIALS Refer to Division 10.
15-8 Item Section
Sanitary Sewer 1034 Water 1036 Deliver only approve d materials to the project. Air release valves and combination air valves shall meet AWWA C512. In addition, air release valves for sanitary sewer force mains shall have long bodies, shall be equipped with back flushing connections and shall have a hood over the outlet. Double check valves (DCV) and Reduced Pressure Zone principal (RPZ) backflow prevention assemb lies shall be listed on the University of Southern California Foundation for Cross - Connection Control and Hydraulic Research list of approved backflow devices . Line stops consist of a sleeve, temporary valve and closure cap. The sleeve and cap shall meet applicable AWWA standards, shall be made of cast iron or stainles s steel, shall be pressure rated at 200 psi and shall be sized for the type pipe to be tapped. The temporary valve shall be suitable for contact with potable water with NSF certification and designed to match the actual field conditions. Line stop bypass pipe shall be pressure rated at 200 psi, shall be NSF certified and shall be adequately restrained. Use screw or slip type valve boxes with a base to fit the valve yoke and a removable plug cap with the word “ Water ” or “Sewer ” cast therein. Install p recast manholes in accordance with Section 1525. 1515 -3 CONSTRUCTION METHODS Apply Section 1505 for excavation, trenching, pipe laying and backfill. Place two 4 inch x 8 inch x 16 inch concrete blocks beneath valves and fire hydrants for support. When necessary , due to project sta ging, install valves, meters and fire hydrants as appropriate for the current grade and make adjustments to finished grade as work progresses. Provide enclosures with positive drainage for utility controls.
A.Valves Install all valves with an approved valve box set flush with the ground or pavement. Place a 24 inch diameter precast concrete ring flush with the ground around all valve boxes not in pavement. Test and sterilize tapping valves before making the tap. Do not allow cuttings to enter the tapped mai n.
B.Meters Install water meters adjacent to the right of way or as shown in the plan s. Place meter boxes with the top of the meter box flush with finished grade of the project.
C.Backflow Prevention Assembly Install backflow prevention assembly off the highway right of way or as shown in the plans. Licensed installers shall test and certify RPZ backflow preventer installations. Enclose RPZ backflow prevention assembly above grade in a hot box. Enclose DCV backflow prevention assembly below grade in a precast concrete vault with positive drainage or above grade in a hot box.
15-9 Install the hot box on a 4 inch thick concrete slab that is 6 inches larger than the box and
2 inches to 4 inches above finished grade.
D.Fire Hydrants Install fire hydrants ou tside of the vehicle recovery area of the roadway, adjacent to the right -of-way line or in protected areas. Connect fire hydrants to the main with a 6 inch valve and branch line having at least as much cover as the distribution main. Set hydrants plumb wi th the pumper nozzle facing the roadway and with the breakaway safety flange between 1 inch and 4 inches above the finished surrounding grade. Except where otherwise approved, place hydrants into service as soon as practicable. Place at least 7 cf of clean crushed stone around the base of the hydrant to insure drainage of the hydrant barrel. Where necessary, remove the hydrant shoe and replace with the appropriate type to connect a relocated hydrant to the new pipe. Furnish and install or remove hydrant extension pieces to provide the proper bury of the pipe and hydrant.
E.Line Stops Provide li ne stop valves to temporarily shut down the flow in pressurized pipes. Provide line stops to temporarily dead end a pipeline when there are no available working valves on the existing piping. Provide line stops with bypass to isolate a section of the exi sting pipeline while maintaining the flow. After line stop valves are removed, permanently cap the tapping sleeve and backfill the entire excavation with compacted select material.
F.Air Release Valves and Combination Air Valves Install air release valves an d combination air valves at the high point of pressurized pipelines. Place a precast manh ole around air release valves and combination air valves .
G.Miscellaneous Controls Install corporation stops with tapping saddles for connecting 2 inches or smaller wat er lines to larger water lines. Install corporation stops at 45 ± 10 degrees from vertical on the larger line. To aid in testing and flushing, install corporation stops at all elevated points along the pipeline to bleed off all entrapped air. 1515 -4 MEASUREMENT AND PAYMENT __" Valves , __" Water Meters, Fire Hydrants, __" Line Stops and other items listed in the pay items will be measured and paid per each for the appropriate size and type. Fire Hydrant Leg will be paid per linear foot. Valve s for the fire hydrant leg will be paid separately as __" Valves . The term Relocate in a pay it em means to physically move the existing item, either vertically or horizontally, using the appropriate materials to place the item into working order. Measurement and payment will be made per each for the appropriate size and type. When relocating a fire hydrant, valves will only be paid for if there is no properly functioning existing valve. No additional compensation will be made for adjustments due to project staging on new or relocated items. Reconnect Water Meter means to transfer or replace the pipi ng from a new water line to an existing water meter that is not relocated. Measurement and payment for meters will be made per each . __" Water Service Line will be paid per linear foot for pipes 2 inches or greater .
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 733–735 of 857.