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This procedure may be used so long as, in the opinion of the Engineer, the work is <br /> proceeding satisfactorily. The Engineer may revoke permission to use the "trench box" <br /> at any time he feels unsatisfactory or inadequate work is being performed and the <br /> Contractor shall , without appeal, immediately begin using sheeting, bracing and <br /> shoring to maintain the allowable trench widths . <br /> At all times, when soil conditions permit, the bottom edge of the "trench box" shall be <br /> no lower than the springline of the pipe, so as to disturb the trench compaction when <br /> advancing the "trench box" . <br /> 5) Placing of Excavated Material - All excavated materials shall be placed where <br /> indicated by the Engineer in such a manner as not to endanger the work and so that free <br /> access will be maintained at all times to all parts of the trench and to all fire hydrants <br /> and their gate valves in the vicinity. Such material shall be neatly piled so as to <br /> interfere as little as possible with traffic. <br /> 6) Drainage The Contractor shall furnish sufficient pumping or other dewatering <br /> equipment and shall provide at his own expense satisfactory drainage whenever needed <br /> in trenches and other excavations during the progress of the work and its completion <br /> for inspection. Water shall not be allowed to flow over or raise upon any concrete, <br /> masonry or pipe until work has been inspected and the mortar or concrete has properly <br /> set. <br /> Unless otherwise permitted by the Engineer, the water table shall be lowered by the use <br /> of a well point system. Open trench pumping may be permitted only upon approval by <br /> the Engineer of the method of pumping and drainage to be used. If open trench <br /> pumping is approved, the water must be conveyed entirely through approved coarse <br /> material placed below the bottom of the foundation. The depth of this coarse material <br /> shall be determined by the Contractor and approved by the Engineer. <br /> Materials and workmanship used for the well point system shall be in keeping with the <br /> approved standard practice. The well point system shall function so as to enable pipe, <br /> concrete cradle and appurtenances to be installed without interference from running or <br /> standing water at the bottom of the trench. The Engineer shall make the final decision <br /> as to the acceptability of the well point system or any part thereof. <br /> Where necessary, pea gravel or graded sand shall be used in conjunction with the well <br /> points as they are installed in insure continuous pumping in the dewatering of fine <br /> material . <br /> The cost of dewatering shall be included in the various unit prices bid under the <br /> mainlines. <br /> 7) Disposal of Water from Excavations - All water pumped or bailed from trenches or <br /> other excavations shall be conveyed in a proper manner to a suitable point of discharge <br /> by the Contractor at his own expense . <br /> The Contractor shall provide for the disposal of water removed from excavations in a <br /> manner that will not cause injury to public health, private or public property, any <br /> portion of the work completed or in progress, the surface of the streets, or cause any <br /> impediments to the reasonable use of the site by other Contractors. The Contractor <br /> shall be responsible for complying with all the local regulations and those of the <br /> 02534- Sanitary Sewer Force Mains <br /> 02534 - 6 <br />