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Project Name 02720 - 1 Storm Drain Systems SPECIAL PROVISIONS SECTION 02720 STORM DRAIN SYSTEMS This special provision modifies the corresponding Montana Public Works Standard Specifications, Sixth Addition – April, 2010. All provisions that are not amended or supplemented remain in full force. Amend Part 2 of the Standard by ADDING the following: 2.2 PIPE MATERIALS E. Polypropylene Pipe 1. Furnish Polypropylene Pipe produced as a twin wall pipe with smooth interior bore and corrugated outside wall formed with co-extrusion techniques. Assure that the material meets or exceeds ASTM F2736 and AASHTO M330 for pipes 12 inches through 30 inches and ASTM F2881 and AASHTO M330 for pipes 36 inches through 60 inches in diameter. 2. The normal laying length is a maximum of 20 feet except shorter runs are permitted adjacent to manholes, catch basins or other appurtenances. Assure each pipe length is marked with the size and code number. Assure that each pipe has a bell and spigot with rubber gasket. Make the rubber gasket joint using a rubber gasket compressed between the outer surface of the spigot and the inner surface of the bell. Make any field fabricated corrugated connections with corrugated coupling having split collar engaging at least two full corrugations. Assure all joints are watertight connections under all service conditions including, expansion, contraction, settlement and pipe deformation. 3. Furnish fittings as required of the same material, construction and joint design as the main sewer pipe. Amend Part 3 of the Standard by REMOVING SECTION 3.4 STORM DRAIN SERVICE LINE in its entirety: ---PAGE BREAK--- Project Name 02720 - 2 Storm Drain Systems Amend Part 3 of the Standard by AMENDING the following: 3.5 TESTS A. Light Test(Visual) 1. Once the trench is backfilled, perform a light test between manholes to check alignment and grade of the pipe for displacement. The completed pipeline must permit a true circle of light to be seen from manhole to manhole. B. Leakage Test 1. Unless specified a leakage test will not be required. Any potential obvious and concentrated leaks, such as open joints, pinched gaskets, cracked barrels or bells will not be allowed. A leakage test pursuant to SECTION 02730 SANITARY SEWER COLLECTION SYSTEM, may requested by the ENGINEER upon questionable results from T.V. Inspection. Amend Part 3 of the Standard by ADDING the following: 3.5 TESTS D. T.V. Inspection 1. All storm drain mains shall be inspected using a television camera before final acceptance. A storm drain line is defective and unacceptable if the alignment is outside the specified limits water ponds in any section are equal to or greater than 2 times the grade tolerance specified herein under Section 02720.3.1.E.1 or the pipe has visible defects such as open joints, pinched gaskets, cracked barrels or bells or similar defects. 2. Pay all costs incurred in repeat television inspections or television inspections performed solely for Contractor benefit. 3. Record all television inspections in a format acceptable to the Owner. Pull the camera through the sewer at 30 feet per minute maximum. If the camera is pulled by attaching to the hose of a hydraulic sewer cleaner, assure the hose is not active during the pulling process. END OF SECTION