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~ <br />Fadeal Register / Vol. 54. No. <br />MAX <br />/ Tueeday. October 31. 1989 / Rclea aad <br />TABI: 8-1 . <br />UM ALLOWABLE SLOPES_ <br />45985 <br />SO[L OR ROCK TYPE <br />MAXIMUH ALlONABLE SLOPES(H:V)Cll <br />FOR EXCAYATIOHS LESS THAN 20 FEET <br />S7ABLE ROCK <br />YERTICAL(90) <br />TYPE A 121 <br />3/41 (53) <br />1:1 (45') <br />TYPE B <br />112:1 (34) - <br />TYPE C <br />N07ES: <br />1. Numbers shoxn in parentheses next <br />degrees fro m the horizontal. Angle <br />2. A short-term maximum allovable <br />excavations in Type A soil [ha <br />Short-cerm maximum alluvable s <br />feec (3.67 m) in depch shall b <br />3. Sloping or benching for excavations <br />prnfessional engineer. <br />to maximum ailodable sloaes are angles expressed in <br />; have been rounded off. <br />slope of 1/2H:lV (63°) is alloved in <br />are 12 teet (3.67 m) or less in deQth. <br />opes For excavations greacer than 12 , <br />3/4H:tV (53°). <br />ireater than 20 feet deep shaTl be designed by a registered <br />Figurr B-t <br />Slopa ConRyueations <br />(AQ slopss itatsd belar an Ia the horizonlal b ntlo) . <br />' B-LS E:mrvtlonr made in ryPe Awit <br />L AII Nmple dap+ acuvatloa 70 feet or kss fa dep shaD h+re a mudmum aDow■ble dopa ot'/.:L <br />?0' Max. <br />A1 <br />si!, <br />I S(mpk Slope--Gaaca! <br />pxwptlam SlmPla doye axuvgtlam whtr3 an apla 24 houra or lesa (short term] wd Mhic3 us u feat or las tn depth shall have a <br />maalmum atlmvablc dapa ot Y.:t. • <br />~ <br />V4 <br />