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widened in the near future when proposal of such widening is <br />supported by a design study. <br />7) Joints and Couplings <br />a) Steel Pipe <br />i) Couplings - Couplings shall be tight, tack welded if <br />necessary and sufficiently rigid (no noticeably <br />movement in joint) to prevent misalignment during <br />driving or pushing operation. Tack welding of <br />couplings is only required where necessary to ensure <br />the integrity of the joint. <br />ii) Welded Joints - Joint welds shall be made in a neat <br />workmanlike manner, shall be air tight and <br />continuous over the entire circumference of the pipe <br />and shall increase the outside diameter by nor more <br />than 3/4 total. <br />b) Coupling thickness shall be such that the overall casing <br />diameter is increased by no more than 3/4 total. All <br />couplings shall be leakproof. <br />1 8) Drilling Fluids - If drilling fluids are used to lubricate the auger and <br />facilitate the removal of cuttings, they shall consist of a mixture of <br />water and gel- forming colloidal material such as bentonite, or a <br />I� <br />1 <br />1 07/03 <br />I� <br />polymer surfactant mixture producing a slurry of custard -like <br />consistency. <br />Plain water may be used if appropriate under the conditions <br />outlined in this exhibit. <br />9) Shoring and Bracing Materials - Materials used for sheeting, sheet <br />piling, cribbing, bracing, shoring and underpinning shall be in good <br />serviceable condition and timbers shall be sound, free from large or <br />loose knots and of proper dimensions, as required by OSHA <br />regulations. <br />10) Steel Shelving - Steel shelving welded inside the casing at the <br />leading end to prevent undue flowback of spoil material must be <br />approved by the local Maintenance Engineer prior to use. <br />16200 -15 03- 1438.A <br />