Thomco Construction Inc. 6/14/2021

r CITY OF EVERETT SPECIAL PROVISIONS Trench dewatering shall be included with the Work with no direct compensation made. 7-09.3(8) Removal and Replacement of Unsuitable Materials Delete all three paragraphs of 7-09.3(8) and substitute the following: Remove Engineer classified unsuitable material at the trench bottom and replace with "Foundation Material Class A or B", or other Engineer approved imported or native material. Replace, at Contractor's expense, unauthorized over-excavation with Gravel Borrow. Compact Gravel Borrow to minimum 90-percent maximum density. 7-09.3(9) Bedding the Pipe Revise the first paragraph in 7-09.3(9) to read as follows: Place sand backfill for pipe zone bedding to the depths shown in COE Standard Drawing No. 614. Compact sand backfill for pipe zone bedding around the pipe to ' 90-percent of maximum density by approved hand-held tools, so as to provide firm and uniform support for the full length of the pipe, valves, and fittings. Determine maximum in place density using nuclear method (ASTM 2922-17). Determine laboratory maximum dry density and optimum moisture content using the Modified Proctor Method in accordance with ASTM D-1557. Take care to prevent damage to the pipe and its protective coating. 7-09.3(10) Backfilling Trenches Revise the last paragraph in 7-09.3(10) to read as follows: Place a minimum 12-inch sand cushion between the water main and existing pipelines or other conduits when encountered during construction. Supplement 7-09.3(10) by adding the following: Backfill trenches in accordance with COE Standard Drawing No. 614. Unless Engineer directs otherwise, provide Controlled Density Fill for fill above the pipe zone for water main construction that is perpendicular to the travel lane in paved street sections. The Engineer may authorize the use of Gravel Borrow or suitable native material in non-paved areas. 7-09.3(13) Handling of Pipe Supplement 7-09.3(13) by adding the following: Supply water main pipe having ends plugged by manufacturer immediately after manufacturing to eliminate debris entrance into the pipe during shipping and storage. Leave plugs in place until installing pipe in trench. Failure to supply the debris plugs or to maintain the debris plugs until pipe installation may be cause for City to reject the pipe or require Contractor to disinfect the pipe in accordance with AWWA C651 and as witnessed by City Water Quality personnel prior to installation. 7-09.3(19) Connections 7-09.3(19)A Connections to Existing Mains Delete the last paragraph in 7-09.3(19)A and substitute the following: Only City Utilities Department personnel may make connections to existing water mains after successful pressure testing, disinfection and flushing. 1 Schedule arrangements with the City Utilities Department a minimum of five business days in advance of making connections to the existing water main. Assemble necessary materials, equipment, and labor necessary to properly complete the Work prior to beginning the connection. Water Main Replacement"V" Division 7—STORM,SEWER,WATER April,2021 ' WO No.—UP3730 SP—173