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If a drilling fluid is used to lubricate the outside of the casing, or <br />the auger and cuttings, it shall not be pumped under pressure <br />great enough to cause any jetting action whatsoever, or to <br />otherwise saturate the soil ahead of the casing. External drilling <br />fluid carriers shall be no larger than 3/4 O.D. and must be <br />Lpermanently and securely fastened to the casing with the leading <br />end shielded from damage. <br />In soils with a high clay content only, plain water may be used to <br />clean the augers as necessary to prevent binding. When plain <br />water is used, it must be hand pumped or gravity fed through a <br />carrier pipe permanently and securely fastened to the casing. <br />G. Equipment Breakdowns or Other Unforeseen Stoppages <br />If forward motion of the casing is halted at any time other than for <br />reasons planned for in advance (addition of casing and auger sections, <br />etc.) and prevention of voids under paved areas cannot be assured, the <br />casing must be filled with concrete by pressure grouting as soon as <br />' possible and abandoned. If removal of the augers from a casing to be <br />abandoned will allow voids to form under paved areas at the casing head, <br />' the augers must be abandoned also. <br />When an obstruction is encountered that cannot be passed or an existing <br />utility is damaged, cutting of the pavement for inspection will be <br />approved by the local Maintenance Engineer or his representative, when <br />consideration of all pertinent facts indicate that such action would offer <br />' the most practical solution to the problem for all parties concerned. Any <br />such authorized pavement opening shall be repaired according to the <br />appropriate specifications in the Utility Accommodation Guide. No <br />' cutting of the pavement will be allowed on Interstate of other limited <br />access facilities. <br />PART 6 - TESTING <br />6.01 GENERAL <br />A. In air pressure test for leaks shall be conducted in the presence of the <br />local Engineer or his representative immediately upon completion of each <br />crossing at a minimum test pressure of 20 psig. The test shall be <br />abandoned, if in the opinion of the engineer, the leaks are potentially <br />damaging to the roadway. <br />1 07/03 16200 -17 03- 1438.A <br />