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� �24Q58.4 Manhole Steps: Manhole sceps shall be of ch� type as specified in the "Special Provisions". Spacing shall be as shown on the detailed manhole plans. 24058,5 Placing Manhole Rings and Cove.rs: The frame or• ring casting shall be set to the � desi.gnated elevation in a full mortar bed, but adjusting rings of the numbe� show�n on the plans shall be provided, unless specifically shown to be omitted< � 24059. BACR;FILLING, CLEANING UP, AND r�INTAIrfZNG SURFACES: � 2405901 Backfill Proceduxe at Pipe Zone: SelE�ted backfill material free fro� rock or boulders - or other unsuitable substances - sha11 be deposite�l in the trench simultaneously on both sides of the pipe for the full width of the trench and to an elevation of at least 6 inc.hes s�bove the t�p of the barrels of pipe 8 , inches or less in diameter, and not LE:SS than 6 inches above the horizontal centerline of pipes with diameter 12 i.nches or larger. � The backfill material shall be moistei�ed if necessary, tamped in thin (about 4 inc11) layers, and thoroughly compacteci under and on each side of the pipe to provide solid backing against the extE�rnal surface of the pipea � � � !�J � � , � L�_J 24059a2 Backfill Procedure Above Yipe Zone: (Type "a") Procedure whers settlement is unimp�ortant. Succeeding layers of backfill may contain coarser materials and shall be free from pieces of rocic, concrete or clay lump more than one cubic foot in volume, roats, stumps, tin cans, rubbish, frozen mat�rials and other similar articles whose presence in the bac�fill would cause excessive settlemento This type of backfilZing may be accomplished above the pipe zone by any mechanical means or �therwise, at the option of the Contractor. On traveled s�treets, c.ompleted backfill shal.l be rolled by whee� tyge or crawler type equipinent weighing not less than 6 ton. Service shall be mainta�.ned in gassable condition for traffic until date of final iz�spe�ti�n. 24059,3 (Type "b") Succeeding l�yers of backfill may contain coarser materials and shall be fr�e from piEc.e� of ro=k, foncrete, or clay lump more than one cubic foot in volume, roots, stumps, tin cans, rubbish, frozen material.s and other similar articles whose pzesence in the b3ckfill would cause exc�ssive settlement� This type of backfilling may �e compacted by puddling with hose and long pipe nozzle, or by flooding the trench, as the backfilling is accomplished above the pipe zone by any mechanical means or atharwise, at the option of the Contractor. It is important thac prop�r precautions be taken to prev�nt flooding of the pipe �ahen flooding the trench, an�i the Contractor shall be wholly r.esponsible for neglect of these p��cautions. 24059.4 Procadure [,rhere Settlement is Impror_ant: (Type "c") Succeeding layers of back- fi11 may contain :oarser materials and shall be free from pieces of rock, concrete, or clay lumg more than one-third cudic foot in volume, roots, stumps, tin cans, rubbish, Frozen ma[erials and �ther similar articles whose presence in the back- fi11 would cause excessive setklement. This type of backfilling shall be placed in uniform lay�rs, beEore compaction, of appro�imately 6 inches, tamped by mechanical mean�. 24059.5 Procedure j�lhere S�ttle��ent ic 1mPottant: (Type "d") Succeedi.ng .l.ayers of back- fill. shall be made ot sel��ted materials meeting requirements as set fort.h in the "Special Pr�ti�1S10i1S��. This type ot backfilling sha11 be pla�ed in uniform layers, before c�mp�ction, of appro�cimately 6 inches, tamped by mechanical means. It shall be che du�y of the. C�ntr3:tor to remove ��cavated materials not used in bar_ktillir.g to a?ocar.i�n as designated in the "Special Pro�isions". 24000 - 10