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Occupational Safety and Health Administration (OSHA) Standards, 29 CFR, Part 1926 , ' Subpart P- Excavations, Trenching, and Shoring. 1906 PROJECT CONDITIONS A. Coordination : Coordinate this work with the work of other Sections to avoid any delay or interference with other work. ' PART 2 = PRODUCTS ' 2 . 01 MATERIALS A. Timber: Timber for trench sheeting shall be hardwood, a minimum of two inches in thickness, solid and sound, and free from weakening defects such as loose knots and splits. B . Steel Sheet Piling : Steel sheet piling shall conform to one of the following specifications : ASTM A328 , ASTM A572 Grade 50, or ASTM A690 . C . Stringers and Cross Bracing : Steel for stringers and cross bracing shall conform to ASTM A588 . D . Portable Trench Boxes : Portable trench boxes shall be constructed of steel conforming to ASTM Specification A36 . Connecting bolts used shall conform to ASTM A307 . All ' welds and welding shall conform to AWS D1 . 1 . PART 3 - EXECUTION ' 3 . 01 EXAMINATION ' A. Examine areas in which work is to be performed . Report in writing to Owner ' s Representative all prevailing conditions that will adversely affect satisfactory execution of the work . Do not proceed with work until unsatisfactory conditions have been corrected . B . Starting work constitutes acceptance of the existing conditions and this Contractor shall ' then, at his expense, be responsible for correcting all unsatisfactory and defective work encountered . ' 3 . 02 GENERAL A . The trench safety system shall be constructed, installed , and maintained in accordance ' with the plans and/or to the design prepared by the Contractor ' s Registered Professional Engineer, to prevent death or injury to personnel or damage to structures in or near these trench excavations . Materials excavated from the trench shall be stored no closer to the edge of the trench than one-half the depth of the trench. ' 02015 - 2