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I <br />The casing, auger and cutting head requirements specified for the <br />most restrictive condition to be encountered shall govern the set <br />up procedure for a particular crossing. <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 />1 07/03 16200 -16 03- 1438.A <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 />Crossing operation requirements under the appropriate method used and <br />subsurface conditions are as follows: <br />1) Driving or jacking, without auger - For casings with outside <br />diameters of three (3) inches or less, at the minimum depth of 36 <br />' <br />inches and up to five (5) inches outside diameter for depths of <br />cover exceeding six (6) feet, closed end jacking or driving is <br />permitted. <br />2 Hydraulic or mechanical jacking, with auger - The use of an auger <br />) Y 1 9, 9 9 <br />is required by the Department on all crossings using casings <br />greater than five (5) inches outside diameter (greater than three (3) <br />inches outside diameter if less than six (6) feet deep) and is <br />intended to prevent a rigid plug of spoil material from forming at <br />the head of the casing. <br />1 07/03 16200 -16 03- 1438.A <br />