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deposit contains no clay lenses or non-conformities that would <br /> weaken the working face. <br /> The material in the near vertical wall will be in-place sand and <br /> gravel and assumed to be cohesion less and having a friction <br /> angle ((D) of 45 . Using this information we have calculated the <br /> factors shown in the following table using the formula FS = <br /> TanO =TanA, where 0 is the slope angle. <br /> Slope Evaluated Calculated slope Factor of Safety <br /> angle A when (D= 45 <br /> Proposed slope (3:1) 18.43 3.00 <br /> Slope toe to closest 10.72 5.28 <br /> structure <br /> (1) 10.72 angle is calculated from 16 feet slope height and 84.5 feet horizontal from toe to edge of street <br /> As shown above the safety factor for the closest structure is <br /> 5 .28 : 1 so by reason as you move away from the excavated face the <br /> greater the safety factor would be. The final graded slopes of <br /> 3: 1 leave a stable slope that will not affect structures within <br /> 200 feet of the excavated area. <br />