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CITY OF EVERETT SPECIAL PROVISIONS <br /> <br />3rd Ave Water Quality Facility Division 7 – STORM, SEWER, WATER September 12, 2024 <br />WO No. – UP 3775 SP – 188 <br />7-09.3 Construction Requirements <br />7-09.3(5) Grade and Alignment <br />Revise the first sentence of the third paragraph in 7-09.3(5) to read as follows: <br />Provide minimum cover from the final surface grade to the top of the pipe of 36- <br />inches for water mains less than 12-inches in diameter and 48-inches for water <br />mains 12-inches or greater in diameter. Provide 60-inches as the maximum depth <br />from the final surface grade to the top of all water main pipes. Adhere to both <br />minimum and maximum depths from finish grades unless Plans indicate otherwise. <br />7-09.3(7) Trench Excavation <br />Revise the second paragraph in 7-09.3(7) to read as follows: <br />Excavate bell holes to the extent necessary to permit accurate Work in making and <br />inspecting the joints. Keep the banks of the trenches as nearly vertical as soil <br />conditions will permit, and where required to control trench width or to protect <br />adjacent Structures, sheet and brace the trench. Provide trench widths to 1 foot <br />above the top of the pipe in accordance with COE Standard Drawing No. 614. <br />Standard excavating equipment shall be adjusted so as to excavate the narrowest <br />trench possible. <br />7-09.3(7)A Dewatering of Trench <br />Supplement 7-09.3(7)A by adding the following: <br />Furnish, install, and operate necessary machinery, appliances, and equipment <br />to keep excavations free from water during construction. <br />Trench dewatering shall be included with the Work with no direct compensation <br />made. <br />7-09.3(8) Removal and Replacement of Unsuitable Materials <br />Delete all three paragraphs of 7-09.3(8) and substitute the following: <br />Remove Engineer classified unsuitable material at the trench bottom and replace <br />with "Foundation Material Class A or B", or other Engineer approved imported or <br />native material. <br />Replace, at Contractor’s expense, unauthorized over-excavation with Gravel <br />Borrow. Compact Gravel Borrow to minimum 90-percent maximum density. <br />7-09.3(9) Bedding the Pipe <br />Revise the first paragraph in 7-09.3(9) to read as follows: <br />Place sand backfill for pipe zone bedding to the depths shown in COE Standard <br />Drawing No. 615. Compact sand backfill for pipe zone bedding around the pipe to <br />90-percent of maximum density by approved hand-held tools, so as to provide firm <br />and uniform support for the full length of the pipe, valves, and fittings. Determine <br />maximum in place density using nuclear method (ASTM 2922-17). Determine <br />laboratory maximum dry density and optimum moisture content using the Modified <br />Proctor Method in accordance with ASTM D-1557. Take care to prevent damage to <br />the pipe and its protective coating. <br />7-09.3(10) Backfilling Trenches <br />Revise the last paragraph in 7-09.3(10) to read as follows: <br />Place a minimum 12-inch sand cushion between the water main and existing <br />pipelines or other conduits when encountered during construction. <br />Supplement 7-09.3(10) by adding the following: <br />Backfill trenches in accordance with COE Standard Drawings No. 614, 615 and 620.