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1 the requirements of the Department of Environmental Regulation. Flaring 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 the back of the cutting head and the end of the casing shall be limited to the clearance necessary to allow the cutting ' head to function without coming in contact with the end of the casing. In areas where sand pockets may be encountered the cutting head must be construction so that ' it can be retracted into the casing, to within the limits specified in this section for the particular material encountered. ' b) Hard pan, clay, hard sand -clay and stable cohesive soils - As in rock, the cutting head should normally precede the casing but the type cutting head used must allow no more than two (2) inches between the back of the head and the 1 leading end of the casing. Cutting heads with cylindrical, pointed chippers designed for use in solid rock shall not be used. c) Loose unstable soil - The distance between the leading end of the first auger section and the leading end of the casing shall be as necessary to maintain a solid plug of spoil ' 07/03 16200 -12 03- 1438.A I u