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� 603.000 Continued. 600-3 WIDTH OF TRENCH may vary with, and depend upon, the depth of trench and the nature of the excavated material eneounte�ed; but in any case, shall be of ample width to permit the pipe to be laid and jointed properly and the backfill to be placed and compaet��d properly. The minimum width of unsheeted treneh for pipe less }han 10 inehes shall be 18 inehes and for pipe 10 inchea or larger, at ieaet two foot greater than the diameter of the pipe, except by consf.nt af the Engineer. The maximum clear width of the trench at the top of the pipe shall not be more than two feet greater than the ��utside diameter of the pipe. Unless otherwise specified on the plans, all pipe will be placed in a flat bottom trench with tamped backfill. The sides of the treneh shall slope back to provide a stable slope for the particular type of soil in the trench. If the trench is excavated to a greater width than authorized, the Engineer may direet the Contractor to provide a higher elass of bedding, a higher strength pipe or both, than that required by the Contract, without additional compensation therefore, as the Engineer may deem necessary to satisfy the design requirements. FAULTY GRADE of the trench below grade lines shall be correc�ed with � approved material, thoroughly compaeted without additional com en a to the Contractor. P s tion � � � � � � � SOLID ROCK EXCAI�ATIONS shall include such rocks as are not decomposed, Neathered or shattered and whieh Nill require blasting, barring, wedging or use of air tools for removal. Under this classification shall be included tt�e re�noval of any concrete or masonry structure (except concrete pavement, aurb pavement, curb and that cannot be removed by the standard trer�ching equipmentandThedewalk) removal of individual boulders shall be defined as solid roek excavations sheer the size of boulders shall be defined as solid roek excavation where the size of boulders exceeds two cubic yards. LOOSE ROCK EXCAVATION shall include all siratified roek, sandstone, cemented gravel, shal� and boulders not otherwise defined as solfd rock� regardless of how removed. BLASTING for excavation will not proceed until the Contraetor has notified the Engineer of the neeeasity to do so. This notification shall in no matter relieve the Contractor of the hazards and liability continge�t on blasting operations. The hours of blasting will be fi�:ed by the Engineer, Any damage caused by blasting shall he repaired by the Contractor at his expense. The Contractor�s ethod of ro edure re a t i v e tQ b a s t' �----- —�—� 1 ir�g shal con orm � o a and State.laws and municipal ordinances. When excavation is encountered that is unsuitable for backfill, it shall be rec�oved as directed by the Engineer,