344 ALASKA 2020 SECTION 625
625-1.01 DESCRIPTION. Furnish and place pipe handrail with galvanized steel pipe members,
concrete bases, and other required materials in conformance with the Plans.
625-2.01 MATERIALS. Use materials that conform to the f ollowing;
Concrete Section 550, Class W Pipe ASTM A53, Galvanized, Schedule 40
625-3.01 CONSTRUCTIO N REQUIREMENTS. Set posts plumb in concrete base. Weld
galvanized steel pipe members at rail -to-post connections and intermediate rail connections, as shown on the Plans. Erect railing smoothly and continuously so that it is parallel to the sidewalk grade. Repair all welds and damaged galvanizing to conform to AASHTO M 36.
625-4.01 METHOD OF M EASUREMENT. See Section 109.
625-5.01 BASIS OF PA YMENT. Payment w ill be made under:
PAY ITEM Item Number Item Description Unit 625.0001.____ Pipe Hand Rail LF 345 ALASKA 2020 SECTION 626 SANITARY SEWER SYSTEM
626-1.01 DESCRIPTION . Construct or reconstruct sanitary sewers and appurtenances to
conform to the Plans. This Section r efers to conduit used for sanitary sewers as “sewer conduit.”
626-2.01 MATERIALS. Use materials that conform to the following:
Bedding and Backfill Subsection 204- 2.01 PVC Pipe Subsection 706- 2.05 Polypropylene Pipe Subsection 706- 2.09 HDPE Pipe Subsection 706- 2.08 Ductile Iron Pipe Subsection 707- 2.05
626-3.01 CONSTRUCTIO N REQUIREMENTS. Complete the sanitary sewer system and make
sure it operates properly at the time of acceptance of the work. Furnish and install all incidental parts not shown on the Plans or specified in this Section that are necessary to complete the sanitary sewer system. Meet the applicable provisions of Sections 201, 204, and 603 for all clearing and grubbing, excavation, bedding, backfill, conduit, and appurtenances. If sewer condui t is directly connected to or supported by rigid structures such as manholes, it must have a joint or flexible connection located 5 feet or less from the point of connection or support. Lay sewer conduit accurately to the staked line and grade. Install all service connections as indicated on the Plans. Provide suitable fittings and adapters when connecting existing service sewers. Clean all foreign matter from sewer conduit. Keep water out of trenches until joints are completed. Plug or cover open ends of c onduit and fittings when work is not in progress to keep out foreign matter and rodents. Join pipe according to manufacturer’s recommendations, or as detailed on the Plans. When sewer conduit is laid within a 10- foot horizontal radius of an existing or a new water main, and is above or 3 feet below the water main, use cast -iron pipe. Remove trench sheeting and bracing above the elevation of the conduit. Do not pull, remove, or disturb sheeting below the conduit.
626-3.02 TESTING. With the Engineer present, test the sewer for grade, alignment, and leakage.
Grade and alignment must conform to staking with no deviation allowed that would inhibit flow. Test for infiltration if the normal groundwater table lies above the invert of the sewer conduit. Infiltratio n must not exceed 4 gallons per inch of conduit diameter per 1000 feet of pipe per day. Test for exfiltration when no groundwater exists above the conduit invert. Leakage must not exceed 5 gallons per inch of conduit diameter per 1000 feet of pipe per day . Use minimum test pressure of 4 feet of water column above the crown at the upper end of the conduit. Correct all leakage before backfilling. After backfilling, test each run of conduit for obstructions and alignment by placing a light at one end. The l ight must be visible through the sewer conduit at the next manhole.