Northwest Construction 1/18/2022

rNovember 23,2021 Provide equipment, labor, tools, materials and miscellaneous parts to perform pavement sawing, pavement removal, excavations, shoring, traffic control and other Work required. Notify City Utility Department a minimum of five business days for each tap made. The Utility Department will determine the date and time to make each tap. Expose the main being tapped, including properly shoring the excavation in accordance with requirements of WISHA, RCW 49.17 including WAC 296-155. Where shown on the Plans, adjust existing valve boxes and covers to the grade as staked or otherwise designated by the Engineer. Using riser rings to adjust the valve box to grade is not allowed. Conduct removal operations conducted to prevent damage to the valve boxes. Replace parts or materials damaged due to the Contractor's operations at his expense. Conduct valve box adjustments so the final adjusted valve box allows full operation of the valve. Remove debris from the adjusted valve boxes to ensure full valve operation. ' Delete the third sentence of the first paragraph in 7-12.3(1) and substitute the following: Where shown on the Plans, provide valve marker post with the exposed portion having the letter "V" and the distance in feet to the valve stenciled in black paint on the post. Provide a two-inch-high stencil to produce the letters and numerals. Under Section 7-20 Sanitary Sewer Forcemains: Add the following to Section 7-20.2 Materials: Swing Check Valve (Wastewater) 9-30.3(2) Special Provisions Valve Boxes 9-30.3(4) Special Provisions Valve Stem Extensions 9-30.3(6) Special Provisions Combination Air Release/Vacuum Valve 9-30.3(7) Special Provisions All forcemain pipe, covers, casting, boxes, structures, and associated items shall be 200 KIP proof test load rated per AASHTO M306 and shall be designed to accommodate the Taylor "Big Red" THDC-978 Container Handler loading as shown on Plan Sheet C10. The Standard Plan references for underground utility structures including frames, rings, castings, an associated items are intended to provide interior geometry and intent only. The Contractor shall increase required reinforcing and wall thickness and change these items as required to accommodate loading criteria requirements. Under Section 7-20.3 Construction Requirements, add the following to Section 7-20.3(1): Forcemain valves, boxes, and assemblies shall be as shown on the plans, per City standard plans, and per section 7-12(3). DIVISION 9 — MATERIALS Under Section 9-30 Water Distribution Materials: i POE Combined Sewer Main Imp. Addendum No. 1 Work Order#UP3768 Page 9 of 12 I