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• and a maximum height of 40~. Dimensions are given in 1•fass Balance Demon- <br />stration, Kind Coal biine, La Plata Countv, Colorado (M.L.R.B. Stipulation), <br />dated Afay 29, 1982. <br />Stability was detern~ir~ d from Terzaghi~s formula: <br />Stability (G) equals resisting force <br />driving force <br />G less than 1, unstable slope <br />G greater than 1, stable slope <br />G equal to 1, slope in equilibrium <br />Driving force was determined fmm Rankine~s formula: <br />P equals zwh2 1 minus Sin <br />1 plus Sin <br />Where: P equals driving force, pressure/ ft. of length <br />w equals weight of fill/ cu. ft. <br />• h equals height of fill <br />equals angle of repose <br />Resisting force is equal to weight per lineal foot x coefficient of <br />friction: <br />R equals h 2 1 x w x coefficient of friction <br />Where: R equals resisting force, resistance/ ft. of length <br />h equals vertical height of resisting force <br />1 equals length to toe of fill <br />w equlas weight of fill/ cu. ft. <br />See diagram pg. 5 <br />(4) <br />• <br />