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Project Name 02730 - 1 of 3 Sanitary Sewer Collection Systems SPECIAL PROVISIONS SECTION 02730 SANITARY SEWER COLLECTION SYSTEMS This special provision modifies the corresponding Montana Public Works Standard Specifications, Seventh Edition – April 2021. All provisions that are not amended or supplemented remain in full force. Part 1.4 – STANDARD DRAWINGS – delete subsection A of the standard in its entirety and replace with the following: A. Standard drawings from Appendix A and the City of Kalispell Standards for Design and Construction applicable to this section are as follows: 1. SA.1 Sewer System Construction Notes 2. SA.2 Typical Manhole Channel Detail 3. SA.3 Sanitary Sewer Manhole Detail 4. SA.4 Typical Sanitary Sewer Service to Existing Main 5. SA.5 Typical Sanitary Sewer Service Stub-Out 6. SA.6 Typical Sanitary Sewer Manhole Marker Post 7. SA.7 Typical Forcemain Valve Section Detail 8. SA.8 Forcemain Discharge Manhole Detail 9. SA.9 Sanitary Manhole Cover 10. SA.10 Typical Exterior Grease Interceptor 11. SA.11 Interior Grease Interceptor 12. SA.12 Exterior Sample Port Design & Materials 13. Standard Drawing No. 02660-2 Water and Sewer Main Separation 14. Standard Drawing No. 02720-6 Precast Manhole Bases 15. Standard Drawing No. 02730-1 Nomograph for Air Testing Gravity Sewer Mains Part 2.2.A.2 – Gravity Sewer Pipe - delete subsection a.3) of the standard in its entirety. Part 2.2.A.3 – Pressure Sewer Pipe – delete subsections a & b in their entirety and replace with the following: a. Pressure sewer pipe shall be either DR11 HDPE or DR18 PVC. b. Use a nominal laying length of 20 feet (6.1 meters), except shorter may be used adjacent to bends or other appurtenances. Assure each pipe length is marked, as a minimum, with size, SDR, pressure rating or both, ASTM designation and manufacturer’s name and code. ---PAGE BREAK--- Project Name 02730 - 2 of 3 Sanitary Sewer Collection Systems c. Directionally drilled HDPE shall incorporate engineered expansion and contraction restraints, approved by the Owner. d. Service taps shall not be made on pressure sewer pipe. e. Private pressure sewer mains shall be connected to the sewer collection system at a manhole as shown in SA.8. Private pressure sewer services shall be connected to gravity sewer services at the public right-of-way or easement. f. Toner wire shall meet the same requirements as for water main, except pressure sewer main burst through existing mains or installed without continuous trench access shall be installed with 8-gauge, hard-drawn, high-carbon 1055 grade steel core, extra high- strength copper clad conductor (EHS-CCS), and insulated with 45 mil, high-density polyethylene (HDPE). The wire shall have a conductivity rating greater than 21 percent and a break load of greater than 2,500 pounds. Part 2.2 – PIPE MATERIALS - delete subsection B, C, and D of the standard in their entirety. Part 2.3 – MANHOLES – add the following subsection directly following subsection E: F. Joint Seal 1. Furnish nine inch minimum width exterior rubberized joint seals: a. Infi-Shield Gator Wrap b. Press-Seal EZ-WRAP c. MacWrap d. Riser-WrapTM e. Equal product as approved by Owner. G. Chimney Seal: 1. Furnish one of the following acceptable chimney seals: a. Whirly Gig b. Cretex External Chimney Seal c. Cretex Internal Chimney Seal d. WrapidSealTM Manhole Encapsulation System e. Mr. Manhole System f. Equal system as approved by Owner. H. Flexible Gasketed Joint 1. Furnish flexible gasketed joints for all pipe connections. ---PAGE BREAK--- Project Name 02730 - 3 of 3 Sanitary Sewer Collection Systems Part 3.4.G – T.V. Inspections - delete subsections 1, 2, and 3 in their entirety and replace with the following: 1. All sanitary sewer mains shall be inspected using a television camera before final acceptance. 2. A sanitary sewer main is defective and unacceptable if: a. the alignment is outside the specified limits; b. Gravel, sediment, or other construction debris is visible in the pipe; c. water ponding in any section is equal to or greater than 2 times the grade tolerance specified herein under Section 02730.3.1.E.1; or d. the pipe has visible defects such as open joints, pinched gaskets, cracked barrels or bells or similar defects. 3. Perform the T.V. Inspection within 30-minutes of flushing the main. When flushing the main, add water at the upstream end of the main and do not stop adding water until water begins to flow out of the end of the main. 4. Equip the camera with a visual measuring device capable of measuring ponding in the pipe to the level specified in part 2.b above. 5. 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. 6. All main deemed by the Engineer as defective or unacceptable shall have repeated T.V. inspections completed by the Contractor until accepted by the Engineer. Part 4 – MEASUREMENT AND PAYMENT – Delete sections 4.1 – 4.5 in their entirety and replace with the following: 4.1 MEASUREMENT AND PAYMENT A. See Section 01150. END OF SECTION