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along the opening. Flagmen shall be provided by the <br /> permittee if considered necessary for safety by the Director <br /> of Public Works. <br /> The length, width, and location of the trench, also <br /> the manner in which the work is done, shall be under the <br /> control of the Director of Public Works . Every precaution <br /> shall be taken to safeguard the work, and to inconvenience <br /> the public as little as possible. <br /> Excavated material shall be placed so as not to obstruct <br /> gutters or drains and in such manner as will cause minimum <br /> inconvenience to the public. If necessary, temporary covers <br /> for gutters shall be installed to insure adequate drainage. <br /> In all cases , it will be necessary to haul all of the excavated <br /> material from the street. <br /> Openings shall be properly sheeted and braced where <br /> necessary to prevent caving, slipping, or cracking of sides. <br /> Sheeting and bracing , used to support the sides of the <br /> opening, shall be carefully removed as the backfilling of the <br /> trench progresses , but if considered necessary by the <br /> Director of Pub�.ic Works for the protection of the banks, the <br /> sheeting and bracing shall be cut off two feet below the <br /> surface of the subgrade and left in place. If pavement along <br /> the sides of the openings is, or becomes , undermined and <br /> unsupported, permittee shall, at his own cost and exper.se, <br /> break down and remove such undermined pavement and the <br /> foundation thereof, and shall also remove all loose earth <br /> and replace with sand in the manner provided under "BACKFILLING" . <br /> 4 . TUNNELING <br /> Tunnelinc� is often necessary where pipe or conduit <br /> passes under curbs or underground facilities. The permittee <br /> shall not do any tunneling except by permission of the <br /> Director of Public Works. <br /> Where tunneling has been resorted to, the permittee <br /> sha11 bed the pipe or conduit as specified under "BACKFILLING" . <br /> The remainder of the space from top of this fill to the roof <br /> of the tunnel shall be completely filled with Class X concrete, <br /> thoroughly tamped to fill the entire space, and to afford a <br /> rig�.d support for the tunnel roof for its entire area. The <br /> complete backfilling of a tunnel shall be performed under <br /> the supervision of an inspector assigned by the Director of <br /> Public Works. Permittee shall notify the office of the <br />