SRV Construction Company 5/1/2018

CITY OF EVERETT SPECIAL PROVISIONS Provide minimum cover from the final surface grade to the top of the pipe of 36- inches for water mains less than 12-inches in diameter and 48-inches for water mains 12-inches or greater in diameter. Provide 60-inches as the maximum depth from the final surface grade to the top of all water main pipes. Adhere to both minimum and maximum depths from finish grades unless Plans indicate otherwise. Supplement 7-09.3(5) by adding the following: Install Earthquake System piping either fully open, fully closed, or midpoint position in accordance with design of the Earthquake System piping manufacturer. 7-09.3(7) Trench Excavation Revise the second paragraph in 7-09.3(7) to read as follows: Excavate bell holes to the extent necessary to permit accurate Work in making and inspecting the joints. Keep the banks of the trenches as nearly vertical as soil conditions will permit, and where required to control trench width or to protect adjacent Structures, sheet and brace the trench. Provide trench widths to 1 foot above the top of the pipe in accordance with COE Standard Drawing No. 614. Standard excavating equipment shall be adjusted so as to excavate the narrowest trench possible. 7-09.3(7)A Dewatering of Trench Supplement 7-09.3(7)A by adding the following: ' Furnish, install, and operate necessary machinery, appliances, and equipment to keep excavations free from water during construction. 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 1 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. 615. 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 Drawings No. 614, 615 and 620. Water Main Replacement"Q" Division 7—STORM, SEWER,WATER February 9, 2018 -Evergreen Way Rebid 1111WO No.—UP3612 SP—151