All trenches and other excavations shall be properly sheeted and braced to furnish working conditions which are safe and acceptable to the Engineer and to prevent damage and delay to the work. Side slopes shall be such that material will not slide into the bottom. Where masonry is built directly against the sides or bottom of the excavations, the final trimming shall be done just before the concrete is placed.
To secure the protection of the work, the contractor must furnish and put in place, at his or her own expense, braces, timber, sheeting, steel sheeting, etc., as may be necessary for the safety of the work, the public or adjacent property.
The sheeting and bracing shall be removed as the work progresses in such a manner as to prevent the caving in of the sides of the excavation or any damage to the masonry. While being drawn, all vacancies left by the sheeting and bracing shall be carefully filled with fine sand and rammed by special tools, or puddled as directed by the Engineer.
The owner may order the sheeting and bracing left in place when, in its opinion, it is necessary for the protection of the work, the public or adjacent property.
Lumber used for permanent sheeting may consist of any species which will satisfactorily stand driving. It shall be sawn or hewn with square corners and shall be free from worm holes, loose knots, wind shakes, decayed or unsound portions or other defects which might impair its strength or tightness. Minimum thickness shall be two-inch nominal. Lumber for bracing shall be No. 2 common yard lumber on timber in less than six-inch sizes and common structural grade on timbers six inches and over in thickness. Temporary supports must in all cases be removed by the contractor at his or her own expense after, or concurrently with, the completion of the permanent structure.
(Ord. 352. Passed 10-22-62.)