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. , <br />Federal Re&er / VoL $4. Na. 209 'hueday, Octuber 31: 1989 / Rulee and Aegulatfane 45989 <br />AppeeWiz F m Subp rt P--SoNcUon o} ProMtk* SYatMSs <br />Ttig fonav+Gs; Ll4un+ ~ a yiphie ~umm,ry a! th, dnmmb mntained (n .ubp.rt Y far c=ar.etam m'tei ar leaa In deyth. <br />Protmttve ryrtems [or nse (n exuvatlona mon thm tO ka ia depeh muat be daigned by a tepataad peo[c.aia"l enyineer la &ccrdana <br />v.fth 1 19m.eS2 (E) u+d (cj. . . <br />Is the r.xcava iun mo*e - :han 5 Eee[ i depch? . <br />_Ia-there potential <br />for cave-in'. <br />NO <br />Ls ehe excavatian <br />entirely in scable ruek? <br />Excavation m y be <br />made vith <br />vertical sid s. <br />Excavacion ~usc be <br />slopr.d, sho ed, or <br />shielded. <br />,rhieldinR <br />I seiecuea. <br />Go Ca FiRure ? <br />FtCUR <br />ma•m mot a+a2-r <br />SP <br />Co to Figure 3 <br />I - PRELIMiNMY OECiS10NS <br />10 <br />