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Minimum Length <br />in Feet of Full <br />Sized Auger from <br />Crossing Conditions Leading End of <br />Casing <br />Rock 0 <br />Hard -pan, clay, hard sand- (dry) 0* <br />clay <br />(wet) 20 <br />Stable cohesive soils (dry) 0 <br />(wet) 20 <br />unstable soils dr) 20 <br />Loose u ( Y <br />' (wet) 40 <br />Crossings requiring dewatering are to be considered as wet in the <br />' above table. <br />* Full sized augers are not required if lateral movement of the <br />cutting head has been otherwise restricted in a satisfactory <br />manner. <br />6) Length - Casings and uncased carrier pipes shall be of sufficient <br />length to extend under all pavements and in no case shall the end <br />' of the casing be closer than four (4) feet (eight (8) feet preferably) <br />from the pavement edge including paved shoulders, or two (2) <br />feet from back of curb plus additional length as necessary to <br />extend to the excavated slopes of the jacking and receiving pits. <br />Slope requirements are detailed in 5.D. of this exhibit. The ends of <br />casings under limited access facilities and all casings for flammable <br />' materials shall be no closer to the pavement edge (including paved <br />shoulders) than the toe of the front slope. Casings may be <br />required to extend to the right -of -way limits or frontage roads to <br />rprovide for maintenance access on limited access facilities where <br />periodic maintenance activities on the utility are expected. <br />' Casings shall also extend beyond pavement areas that are to be <br />' 07/03 16200 -14 03- 1438.A <br />