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raze 4 of 1 r. 'Then the bottom at subgrade is soft and in the o� inlon of the Inspector cannot support the pipe, a further �ecth and/ or width shall be excava`ed sncl refilled to Aire foundation grade, or the pipe shall be placed on piling, or other appro,j_! means P!,isll be adopted as directed by the Inspec- tor t,j assure A firm foundation for the pipe. -he class or type of material --,:'rich is to be used for r?filling up to pipe grade '^e as determine) by the Inspector. If the Inspector considers that clay, plastic, or reinforced concrete pipe, as shown on the plans, 12 not suitable for the subgrade soil condition, he nav order the contractor to install iron pipe or AC piling pipe to be ,:laced on roc',r stabilized subgrade or on piling. Ledge rock, boulders, End large st)ner s'nall be removed to provide clearance of at leart h inches below outside ca pe barrel and a clear width of Q inches on each side of the pipe shall be provided. Vie space between the bottom of the trench and roct- an9 the bottom of the �,Iie shall be bacL-filled with suitable materist thoroughly tamped. loci-- excavation shall include such roc'rs as are not decom- posed, wAA�'�ar�i, or shattered, and wv,ic'n will require blasting, ra-rLna, wedging, or use of air tools for re-,ovAl. :lay and hsrdpan will not be considered as roc h, tut includes will be any concrete or :nasonry structure, except paver:ents, - curbs, gutters anI sidew,l'-s. Any roc'c le:-g than one cubic .yard in volume Shell be classified as regular or eArth exca- vation, and no extrq compensation shall be allowed. •- Blasting the excavation will not proceed until tie co -tractor has notified the Engineer of the r,ecessit:y to '.o so, Fuch noti- fication not being nece4spr,y where onlv occasional tool ems ,re involved. !'his notification rhell in no mprner relieve the contractor of t-e ha: ar' nn,i lint ill*y con' :.fie~`- Or, blasting op!!ratlon. :"ie ^ours of blarting will }e fl-ed i.y the Sn,-7ineer. Any damage caused b:• blastina Snall be rer-a!re. ^fit `he con- tractor at his expense. The contract-or's .-et',ols of :.roce- dure relntive to blistinJ shell conf-rm "" local a-' stgte laws and municipal orlln,4nces. All ev,-^votes-Aterlal shall be piled in s manner that Ai:l not en!anxer the wor'r -inl that will avoll obstructing side- wal',s v^:' iriv-tiwys, 98 fgr as prsctieaL Cutters s"all be key: clear or other smtisfactory provislons :jade fir rtreet Iri%inewe at R11 timer. we