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a <br /> <br />Natural ground surface~~ <br />i ~ `~ , _ g <br />_~ <br />rr, <br />~:,,, ,_ -----------------Y- <br />--o' Min.----T <br />CHANPIEL ON FLAT SLOPE IN NATURAL SOIL <br />(SLOPE < 8~/1000' ) <br />• <br />Naturalground surface~- <br />,. / <br />;^ s. <br />J"3~ Min. ~ ~ <br />i <br />i <br />%~2' Min. <br />y-- ------- --- -- <br />\~~ <br />rc---6 Min.----~7 <br />~-~i _ <br /> <br />-Rock fill zone <br />CHANNEL ON STEEP SLOPE IN NATURAL SOIL <br />(SLOPE _' 8'/1000') <br />• <br />COLOWYO STREETER GULCH COAL MINE <br />STREETER GULCH DITCH <br />