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inch greater than outside diameter of casing itself. This may be accomplished as follows: a) Overboring - Use of a cutting head with an overall diameter of no more than 3/4 inch greater than the casing diameter. Maximum diameter includes wing cutters which must be securely blocked to limit the overall diameter in order to meet this requirement. b) Use of bands, couplings, collars or welds will be allowed, providing the casing diameter is increased by no more than 3/4 inch. Any such device or method used shall be rigidly affixed and shall in no way weaken the leading edge of the casing. Collars and couplings used to reduce skin friction on steel pipe must be welded in place when cutting heads are used, eliminating the possibility of the cutting head unscrewing or dislodging the collar or coupling during the operation. c) Use of lubricating materials on the outer surface of the casing to reduce skin friction is also acceptable, subject to the requirements of the Department of Environmental Regulation. jFlaring of the casing end will be allowed provided that the original casing diameter is exceeded by no more than 3/4 inch. Any cuts, tears or cracks made to facilitate flaring shall be repaired and reinforced by welding to ensure that the strength of the flared section is equal to or greater than the original section. The use of a misaligned, undersized auger to cut an oversized hole is prohibited. 4) Relationship between auger or cutting head to leading end of first casing section. The leading end of the first casing section shall be straight cut ninety degrees to the centerline of the casing and the distance between the back of the cutting head or leading edge of the first bare auger section, to the leading end of the casing shall be as follows under the appropriate soil condition. a) Rock - On crossings made through solid rock, where the cutting head must precede the casing, the space between 09/03 16200-11 03- 1438.A -R