15-16 (D) Testing
Vacuum test all manholes before grouting and backfilling. Test a ccording to ASTM C1244. 1525 -4 MEASUREMENT AND PAYMENT The height of the manhole will be measured and paid to the nearest tenth of a foot from the inside bottom (invert) of the manhole to the final finished top of the manhole ring. __' Dia Utility Manhole and Utility Manhole Wall __' Dia will be measured and paid by appropriate diameter per each for manholes of 0 to 6 feet height and per linear foot of height over 6 feet. Adjustment or reconstruction of existing manholes will be measured and paid in accordance with Article 858 -4. Drop assemblies will be incidental to the work being performed . Payment will be made under: Pay Item Pay Unit __' Dia Utility Manhole Each Utility Manhole Wall __' Dia Linear Foot 1530 -1 DESCRIPTION Abandon or remove utility facilities. 1530 -2 MATERIALS Refer to Division 10. Item Section Flowable Fill 1000 -7 Portland Cement Concrete 1000 Select Materials 1016 1530 -3 CONSTRUCTION METHODS Apply Section 1505 for excavation, trenching, pipe laying and backfill.
A.Abandoning Pipe Abandon utility pipes shown in the plans or designated by the Engineer by emptying the pipeline contents and plugging the ends with grout or flowable fill. Prepare grout or flowable fill to a consistency that will flow and be vibrated in order for the mix to flow uniformly into the pipe to be filled. Use the constructio n methods in Article 340 -3. Fill or remove the following abandoned utility pipes:
1.Pipe larger than 24 inches .
2.Pipe located within the roadway typical section or the project slope stake line and one of the following:
a.Pipe 12 inches to 24 inches diameter located less than 20 f eet below finished grade.
b.Pipe 6 inches to 12 inches diameter located less than 12 feet below finished grade and not made of cast iron, ductile iron , HDPE or PVC.
c.Located below groundwater table that could become a conduit for water movement.
15-17 Excavate, remove and dispose of properly any abandoned pipe to be removed. Backfill
the resulting trench and properly compact using local excavated material or select backfill as required. Fill abandoned pipe wit h grout or flowable fill to at least 90% full or completely when on railroad right of way. Remove any abandoned utility pipe exposed by grading operations to a minimum depth of 12 inches below subgrade elevation of the proposed roadbed or completed grading template. Plug all abandoned utility pipes. Use grout to plug all abandoned utility pipes at the entrance to all manholes whether the manhole is to be abandoned or not. Use grout or flowable fill to plug all abandoned water mains after new mains are pla ced in service. Abandon valves by removing valve box and backfilling with approved material.
B.Abandoning Manholes Abandon utility manholes in the construction limits by removing the top of the manhole to the manhole spring line or to an elevation of 2 f eet below the roadway subgrade, whichever is greater and filling the manhole barrel with approved material. Plug connecting utility pipes before filling or removing the manhole. Remove the manhole taper, wall and base on all manholes to be removed. Removed f rames and covers become the property of the Contractor for proper disposal.
C.Remove Water Meter Remove water meters by disconnecting and plugging the water service piping at the source main and plugging the piping at the right -of-way line. Return the meter to the utility owner. Dispose of all other parts, piping and boxes.
D.Remove Fire Hydrant Remove fire hydrants by disconnecting and plugging the hydrant leg piping as close to the water main as possible. If the hydrant valve is within 4 f eet of the main, close the valve, plug the outlet side of the valve and remove the valve box. Removed hydrants become the property of the Contractor for proper disposal. 1530 -4 MEASUREMEN T AND PAYMENT Utility pipe that is abandoned by filling or removal will be measured and paid by the linear foot for the size of pipe. Utility pipe that is abandoned by plugging the ends only and leaving in place will not be measured or paid. Abandoned valves will not be measured and paid. Grout or flowable fill used for plugging of abandoned utility pipe is incidental to the work being performed. Utility pipe that is removed by other work of the contract will be incidental to the other work. Material u sed to fill the a bandon utility pipes is incidental to the work being performed. Abandon Utility Manhole will be measured and paid per each. Remove Utility Manhole will be measured and paid per each. Remove Water Meter and Remove Fire Hydrant will be mea sured and paid per each.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 742–743 of 857.