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Project Name 02660 - 1 Water Distribution SPECIAL PROVISIONS SECTION 02660 WATER DISTRIBUTION This special provision amends or supplements the Montana Public Works Standard Specifications, Sixth Addition – April, 2010. All provisions not amended or supplemented remain in full force and effect. Delete Subsection 2.2.B.4 of the Standard and Replace with the following: 4. Fittings a. Furnish fittings meeting the following; 1) Mechanical Joint Class 350 fittings meeting AWWA C153, latest edition, Ductile Iron Fittings for Water. Delete Subsection 2.2.B.6 of the Standard and Replace with the following: 6. Couplings a. Use pipe couplings meeting the following; 1) Ductile iron, mechanical joint solid sleeves, with a minimum 12 inch length. Delete Subsection 2.2.C of the Standard and Replace with the following: C. Polyvinyl Chloride (PVC) Pressure Pipe 1. Furnish PVC water main pipe meeting AWWA C900 requirements, made to ductile iron O.D.’s for “Push-On” joints. Assure pipe joints are bell and spigot having an elastomeric gasket. Use DR 18 Class 235 pipe. Delete Subsection 2.2.D of the Standard in its entirety: Delete Subsection 2.2.E of the Standard and Replace with the following: E. Water Service Pipe 1. Use polyethylene pipe in water service line construction as specified in the contract documents and meeting the following specifications. a. Furnish service pipe of the size or sizes specified. Service lines are considered 2-inch size and under. Service lines over 2-inch size are considered as water mains and are specified und the applicable sections. ---PAGE BREAK--- Project Name 02660 - 2 Water Distribution b. Furnish and install the service pipe from the main according to the requirements of City of Kalispell Drawing W.2 c. Polyethylene Service Pipe 1) Use pipe meeting AWWA Specification C901, “Polyethylene (PE) Pressure Pipe, Tubing and Fittings, 1/2 inch through 3 inch for Water” and ASTM PE 3406-3408. PE pipe to be pressure tubing meeting Table 6 requirements of said speciation. Use class 200 with DR of 7 Polyethylene pipe. Delete Subsection 2.3 of the Standard and Replace with the following: 2.3 TAPPING SPEEVES AND VALVES A. Use tapping sleeves meeting: 1. Split-body type with circular gasket forming a seal around the circumference of the outlet, being a Romac SST III, bolts shall be Core-Ten or Core-Blue, or equal as approved by the City of Kalispell Public Works Department. Delete Subsection 2.4 of the Standard and Replace with the following: 2.4 CORPORATION STOPS A. Furnish brass corporation stops, Mueller 300 Series ball valves. Delete Subsection 2.5 of the Standard and Replace with the following: 2.5 SERVICE CLAMPS A. Furnish Mueller BR2 Series service clamps. Delete Subsection 2.6 of the Standard and Replace with the following: 2.6 CURB STOPS A. Furnish curb stops, Mueller 300 Series ball valves. Delete Subsection 2.7 of the Standard and Replace with the following: 2.7 CURB BOXES A. Furnish extension type curb boxes having 6 ½ foot extended length, with stationary rod & pentagon brass plug. B. Furnish one of the following: 1. Mueller H-10306 for service lines ¾-inch to 1-inch. ---PAGE BREAK--- Project Name 02660 - 3 Water Distribution 2. Mueller H-10310 for service lines, 1 ¼-inch, 1 ½-inch or 2-inch. Amend Subsection 2.8.A of the Standard by adding the following: 4. Furnish a Mueller Resilient Wedge Gate Valve, or approved equal for all valves 4 - inches through 12 – inches. Amend Subsection 2.8.B of the Standard by adding the following: 4. Furnish a Mueller Lineseal Butterfly Valve, or approved equal for all valves 14 -inches and larger. Delete Subsection 2.10.B of the Standard and Replace with the following: B. Furnish Red Mueller Super Centurion 250 fire hydrants with 5-inch Storz adapter and two, 2 1/2 – inch hose connections. Assure hose nozzle threads meet ASA Specification B26 for National Standard Fire Hose Coupling Screw Threads, 7 ½ threads per inch. Furnish National Standard operating nut. Furnish hydrants opening counter clockwise and having and arrow on the hydrant top designating the opening direction. Delete Subsection 2.10.D of the Standard and Replace with the following: D. Furnish hydrants for 6.5 foot bury. Amend Section 2 of the Standard by adding the following: 2.13 METER PITS A. Furnish Mueller Thermo-coil meter pits for services up to 1 – inch, with dual check valve and composite center locking lid. B. Furnish Mueller EZ Vault or approved equal for services larger than 1 – inch, with dual check valve and composite center locking lid. Delete Subsections 3.4.A.1 & 2 of the Standard and Replace it with the following: 1. Perform hydrostatic and leakage testing in accordance with AWWA C600. Once the pipe is laid and backfilled, test for at least two hours, all newly laid pipe, or any valved section, to a hydrostatic pressure of either, 1.5 times the working pressure or 125 psi, whichever is greater. 2. If tablet disinfection will be used, slowly fill the main with clean water. If continuous feed method will be used for disinfection, slowly fill the main with appropriately chlorinated water. Purge all air, and apply the test pressure using a pump hooked up so that the pressure and leakage can be measured. To purge the pipe of air during the test, it may be necessary to tap the pipe at its highest points if permanent air vents, water services, hydrants, etc. are not located at ---PAGE BREAK--- Project Name 02660 - 4 Water Distribution high points. Use corporation stops for this purpose. Furnish the pump connections, gauges, stops, and all necessary equipment for testing. a. After reaching 20 psi in test section, turn off pump and verify pressure stabilizes. Pressure must stabilize for 30 minutes prior to continuing to the required maximum test pressure. b. Take special care when approaching the working pressure of connecting mains to ensure chlorinated or untreated water does not enter distribution system. A stop in the increase of water pressure, when the line pressure approaches the working pressure, is indicative of a leak through a connecting valve. If water pressure stops increasing once the connecting main working pressure is achieved or if line pressure continues to drop to working pressure once pump is stopped, test water may be entering distribution. Stop pump immediately and do not proceed until approval is given by Engineer. Delete Subsection 3.4.C.3.a of the Standard and Replace it with the following: a. Two methods of chlorination may be used: the tablet method or the continuous feed method. Either method shall maintain a minimum disinfection contact time of 24 hours prior to flushing. Delete Subsection 3.4.C.3.a.3 of the Standard in its entirety. Amend Subsection 3.4.C.4 of the Standard by adding the following: b. Heavily chlorinated water flushed from the mains shall not be placed in storm sewer or sanitary sewer and shall be disposed of per DEQ Standards c. Contractor may flush heavily chlorinated water in two ways: 1. Flush main into a water truck with appropriate back flow prevention air gap and dispose of chlorinated water in environmentally friendly matter. 2. Dechlorinate flushed water to a concentration below 0.1 mg/L, before allowing water to enter storm sewer using methods approved by the Engineer. Dechlorination method must be submitted to Engineer for approval at least three business days prior to flushing. Delete Subsection 3.4.D.1 of the Standard and Replace it with the following: 1. After final flushing and before the water main is placed in service, test a sample, or samples, collected from the main(s) for turbidity and organisms. Collect at least one sample from the new main at a maximum of 500 foot intervals. ---PAGE BREAK--- Project Name 02660 - 5 Water Distribution a. Two sets of tests shall be completed for every sample point: 1. One sample set shall be collected directly following final flushing. i. The Contractor shall provide all sample bottles and appurtenances necessary to take samples. ii. The Contractor shall collect sample(s) and mark the sample bottles. iii. The City shall witness sample collection and deliver sample bottles to a certified testing laboratory of the Contractor’s choice within Kalispell City Limits. iv. The Contractor shall pay for all costs associated with sample tests, including City personnel costs for repeated tests due to test failure or City personnel costs for any tests performed outside normal working hours. Normal working hours are (Mon – Fri 8:00 am – 5:00 pm). 2. After passing results of the first test are received, but no sooner than 24 hours following final flushing, the contractor shall take a second sample from the same location(s) as the first sample set. i. Sample procedure shall be the same as those in Section 3.4.D.1.a.1, above. 3. After passing results have been delivered to and approved by the City, the new water main may be placed in service. END OF SECTION