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s <br /> placed to fill any voids created and the backfill shall again be <br /> compacted to provide uniform side support for the pipe . <br /> W. Unless otherwise approved concrete thrust blocks shall be <br /> installed at all fittings and other locations as directed by the <br /> Engineer. Minimum bearing area shall be as shown on the <br /> Drawings. Concrete shall be placed against undisturbed material <br /> and shall not cover joints , bolts or nuts, or interfere with the <br /> removal of any joint. Wooden side forms shall be provided for <br /> r thrust blocks . <br /> X. Restrained joints shall be installed where shown on the Drawings, <br /> required by IRCDUS Standards, or as directed by the Engineer. <br /> r <br /> 3. 14 MARKING FOR OPEN CUT METHOD <br /> A. Number 10 stranded conductor copper trace wire shall be spiral <br /> wrapped or affixed to the top of the pipe . See trace wire Detail M- <br /> 16 for specifications regarding installation . <br /> B . Trace wire is required over all pipes . <br /> C . A 2" wide magnetic I . D. location tape is required over all pipes. <br /> Tape is to be installed 12" below proposed finished grade. <br /> 3. 15 TRENCHLESS INSTALLATION OF PRESSURE MAINS BY <br /> DIRECTIONAL BORING <br /> A. DESCRIPTION <br /> 1 . Portions of the pressure mains shall be installed by the <br /> directional bore method within the limits indicated of the <br /> contract plans and as specified here in . Generally, as a <br /> minimum , the pressure main is to be located within the road <br /> .. right-of-way and shall be installed by directional boring . <br /> 2 . This section includes material , performance and installation <br /> standards, and the contractor's responsibilities associated with <br /> the furnishing of labor, material , equipment, and identical <br /> required to install , complete , required trenchless installation of <br /> pressure mains, as shown on the Drawings and as specified <br /> _ herein . <br /> B . EXPERIENCE <br /> r <br /> 1 . The Contractor must demonstrate expertise in trenchless <br /> method by providing a list of ten ( 10 ) utility references for <br /> which similar work has been preformed in the last two years . <br /> The references should include a name and phone number <br /> where the contact can be made to verify the contractor's <br /> capability. The contractor must provide documentation <br /> 3 - 9 <br />