Allied Construction Associates Inc. 4/23/2021

I CITY OF EVERETT SPECIAL PROVISIONS I7-08.3(2)J High Density Polyethylene Pipe (HDPE) for Combined Sewer (******) Provide leak-proof thermal HDPE butt joints, except at field closures and other joint I connections specifically identified or approved by the Engineer. Butt weld HDPE joints in accordance with manufacturer's recommendation and ASTM D 2657. Use tools recommended by the pipe supplier and approved by the Engineer to fuse joints. Use pipe I manufacturer trained and certified operators to operate the joint fusing equipment. Provide fusing machine having hydraulic pressure control for fusing two pipe ends together. Accurately trim ends of pipe to form perpendicular faces prior to fusing. Provide electrically I heated and thermostatically controlled heating plate on the fusing machine with a temperature gauge for monitoring temperature. Subject the heating plate to periodic inspection, using a temperature stick, to assure even heating. Provide a HDPE flange I adapter with a 316 stainless steel follower ring having Class 125 flange bolt pattern where flanged connections are required. Provide joints between pipe sections free from sharp edges, ridges and depressions on the inside. Internal projection beads do not need be removed from each pipe joint, unless I otherwise noted on the Plans. Provide true alignment at the butt-fused joint between the joined pipes with uniform roll back beads resulting from the use of proper temperature and pressure. Allow adequate cooling time before removing pressure from the butt joint. The I fused joint shall be watertight and shall have tensile strength equal to the pipe. All joints shall be subject to inspection and acceptance by the City. Cut out and replace all defective joints at no cost to the City. I City will not permit threaded or solvent-cement joints and connections. City will not allow fabrication of fittings in the field. Sleeve couplings, repair bands, mechanical joints, flanges and other types of pipe connections are not permitted unless I shown on the Plans or authorized in advance by the Engineer or Inspector. Construct trench in accordance with 7-08.3(1)A. Place pipe in the trench in accordance with 7-08.3(2)B and this section. Backfill in accordance with 7-08.3(3) and these Special Provisions. When backfilling and compacting HDPE pipe, ensure pipe is at the same temperature as the surrounding soil. Fill pipe with water and anchor HDPE pipe to counteract buoyancy if flowable CDF is used for bedding or backfill. City will not permit blocking under I the pipe. Provide continuous HDPE pipe entering manholes. City will not allow short PVC closure segments, except where explicitly shown on the Plans or approved by the Engineer. 7-08.3(3) Backfilling I Delete the first paragraph of 7-08.3(3) and substitute the following: Perform trench backfilling only after inspection and approval of the installed pipe bedding I zone backfill. Refer to COE Standard Drawing No. 614, 615, 620 and the Plans for typical trench section backfill and compaction requirements. If the Engineer determines native material is not suitable for use as trench backfill, use I "Gravel Borrow" conforming to 9-03.14(1) of the Standard Specifications. If there is an excess of suitable backfill material obtained from trench excavation at one location on the project, use it at other locations on the project or dispose of at an approved disposal site. The cost of transporting the excess backfill material is considered incidental Ito the Contract with no direct compensation made. Use Controlled Density Fill in lieu of select trench backfill for fill above pipe zone at street crossings and as directed by the Engineer in other areas where in order to prevent pavement I patch settlement requires high density backfill placement or effective backfill compaction is not possible. Delete the first sentence of the third paragraph. I SEI to SRI Intertie,SROB Rehab Division 7-STORM,SEWER WO No.-UP3714 SP-145 I