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t <br />trench width at the top of the pipe shall not exceed the allowable as <br />determined by the depth of cut and indicated on the Drawings. <br />' B. Remove vegetation, debris, unsatisfactory soil materials, obstructions, <br />and deleterious materials from ground surface prior to placement of fills. <br />Plow strip, or break -up sloped surfaces steeper than 1 vertical to 4 <br />horizontal so that fill material will bond with existing surface. <br />C. Rock shall be removed to a minimum 8- inches clearance around the <br />bottom and sides of all the pipe or ducts being laid. <br />' <br />D. <br />Where pipe is to be laid in limerock bedding or encased in concrete, the <br />be paid on basis of contract conditions relative to changes in work. <br />trench may be excavated by machinery to or just below the designated <br />' 07/06 <br />02221 -7 05 -5564 <br />subgrade provided that the material remaining in the bottom of the trench <br />remains undisturbed. <br />E. <br />Where the pipes or ducts are to be laid directly on the trench bottom the <br />lower part of the trenches shall not be excavated to the trench bottom by <br />machinery. The last of the material being excavated shall be done <br />manually in such a manner that will give a flat bottom true to grade so that <br />pipe can evenly and uniformly supported along its entire length on <br />undisturbed material or bedding rock. Bell holes shall be made as <br />required manually so that there is no bearing surface on the bells and <br />' <br />pipes are supported along the barrel only. <br />F. <br />The bottom of the excavations shall be firm and dry and in all respects <br />acceptable to the Engineer. Excavate any organic soil material from the <br />bottom of the trench and replace with rock bedding, at least 4 inches thick. <br />G. <br />Excavation is Unclassified, and includes excavation to subgrade <br />elevations indicated, regardless of character of materials and obstructions <br />encountered. <br />H. <br />Unauthorized Excavation: Removal of materials beyond indicated <br />subgrade elevations or dimensions without specific direction. <br />' <br />Unauthorized excavation, as well as remedial work directed by Engineer, <br />shall be at Contractor's expense. <br />' <br />I. <br />Additional Excavation: <br />1. When unsuitable bearing materials are encountered at required <br />subgrade elevations, carry excavations deeper and replace <br />excavated material as directed by Engineer. <br />2. Removal of unsuitable material and its replacement as directed will <br />be paid on basis of contract conditions relative to changes in work. <br />' 07/06 <br />02221 -7 05 -5564 <br />