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1 <br />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 />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 />The casing, auger and cutting head requirements specified for the <br />most restrictive condition to be encountered shall govern the set <br />Iup procedure for a particular crossing. <br />1 <br />e <br />F. Crossing Operation - The actual crossing operation shall be accomplished <br />during daylight hours and shall not begin after the hour pre - established as <br />the latest starting time that will allow completion during daylight hours <br />except as allowed below. <br />In emergency situations, or where delay would increase the likelihood of <br />a failure, nighttime work will be allowed to complete a delayed crossing. <br />In addition, where the obvious hazards of nighttime work are carefully <br />considered and determined to be insignificant, nighttime work will be <br />allowed to complete a properly planned crossing if the local Maintenance <br />Engineer agrees that the delay was caused by reasonably unavoidable <br />circumstances, which such nighttime work is necessary to avoid placing <br />an undue economic hardship on the permittee or his contractor. <br />Planned nighttime work is expressly prohibited and will not be allowed <br />except as allowed in the special conditions of the utility permit. <br />Any nighttime work shall be in strict conformance with Section 7 of this <br />document. <br />09/03 16200 -15 03- 1438.A -R <br />