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CITY OF EVERETT SPECIAL PROVISIONS 8-31.3(1)B Certifications Furnish a certified affidavit of compliance of physical and chemical properties for the steel casing pipe specified in this section. 8-31.3(1)C Additional Approvals For Work within the BNSF right of way, a licensed professional engineer in the State of Washington shall prepare the Contractor's shoring and dewatering plans and submit to BNSF for review and approval. Obtain BNSF approval prior to beginning Work within the BNSF right of way. 8-31.3(2) Existing Site Conditions The City of Everett had limited soil borings performed near the location of the boring and jacking work. Soil boring log data performed for this Project, as well as soil information from other projects available to the Contractor are attached in Appendix G. The Contractor may perform additional subsurface investigations at his own expense. 8-31.3(3) Existing Facilities and Utilities Positively locate all utilities within five feet of the alignment. Contact the utility location service and confirm that all known buried utilities are clearly marked and identified prior to commencing excavations or boring and jacking operations in this Project area. 8-31.3(4) Welding Requirements Prequalify all welding procedures used to fabricate steel casings under the provisions of ANSI/AWS D1.1. Perform welding procedures for, but not necessarily limited to, longitudinal and girth or special welds for pipe cylinders, casing joint welds, reinforcing plates and grout coupling connections. Accomplish all welding using skilled welding operators and tackers having had adequate experience in the type of materials being used. Qualify welders used on the Project under the provisions of ANSI/AWS D1.1 by an independent local, approved testing agency not more than 6 months prior to beginning the casing work. Butt weld casing section joints in the field. Prepare each end of the casing for butt welding by providing 1/4-inch by 45-degree chamfer on the outside edges. 8-31.3(5) Installation of Steel Casing 8-31.3(5)A Jacking Head Provide steel jacking head having following requirements: a. Fit to the lead section of the casing in such a manner that it extends around the entire outer surface of the steel casing and projects at least 18 inches beyond the driving end of the casing. b. The jacking head shall not protrude more than 1/2 inch outside of the outer casing surface. c. Securely anchor head to prevent wobble or alignment variation during the boring or jacking operations. d. Carry out excavation entirely within the jacking head and not in advance of the head so as to minimize creation of voids outside the casing. 8-31.3(5)B Jacking Pit Provide heavy guide timber, structural steel, or concrete section of sufficient length to assure accurate control of the boring and jacking alignment. Provide adequate space within the excavation to permit insertion and welding of lengths of casing being bored and jacked. Prepare the rear jacking pit having a vertical surface to allow for tight sheeting or shoring sufficient to transfer the repetitive application of thrust of the jacking machine directly to the bearing soil. Upon completion of boring and jacking operations, prepare the bottom of the jacking pit as a pipe foundation. Remove all Jackson Park Area Stormwater Separation September 2020 WO No. -UP3703 Division 8—MISC CONSTRUCTION SP-180