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® ® STANDARDS PRESENTATION Pg L� <br /> Lt? of q-5- <br /> TO _ <br /> ® CALIFORNIA OCCUPATIONAL SAFETY AND HEALTH STANDARDS BOARD <br /> ® NTENT <br /> ® A Federal <br /> ® N M PROPOSED STATE STANDARD, Standard <br /> ® E E TITLE 8, CHAPTER 4 Section <br /> ® W D Number <br /> ® TABLE B-1 <br /> ® MAXIMUM ALLOWABLE SLOPES <br /> ® C1 <br /> ® SOIL OR ROCK TYPE MAXIMUM ALLOWABLE SLOPES (H:V) <br /> ® FOR EXCAVATIONS LESS THAN 20 <br /> FEET DEEP [3] <br /> ® STABLE ROCK VERTICAL (900) <br /> TYPE A [2] 3/4:1 (53®) <br /> ® TYPE B 1:1 (450) <br /> ® TYPE C 1�:1 (34') <br /> ® NOTS S: <br /> 1. Numbers shown in parentheses next to maximum <br /> ® allowable slopes are angles expressed in degrees from <br /> ® the horizontal. Angles have been rounded off. <br /> 2. A short-term maximum allowable slope of1/2H• 1V (63 <br /> ® degrees) is allowed in excavations in Type A soil that <br /> ® are 12 feet or less in depth Short-term maximum <br /> allowable slopes for excavations greater than 12 feet <br /> ® in depth shall be 3/4H• 1V (53 degrees) <br /> ® 3 . Sloping or benching for excavations greater than 20 <br /> feet deep shall be designed by a registered <br /> ® professional engineer. <br /> Figure B-1 <br /> ® Slope Configurations <br /> ® _(All slopes stated below are in the horizontal to <br /> vertical ratio) <br /> ® B - 1.1 Excavations made in Type A soil. <br /> ® 1. All simple slope excavation 20 feet or less in depth <br /> ® shall have a maximum allowable slope of 3 /4 . 1 <br /> i <br /> ® TYPE A SOIL <br /> ® 20° Max. <br /> ® 3/4 <br /> ® I <br /> ® Simple Slope-..- General <br /> ® IV-9 <br /> ® OSNSB—9B(t/BA) <br /> :2 a <br />