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<br />Stockpile Stability Evaluation <br />Surface Rock Pit <br />-1- <br /> <br />Permit <br />order to further demonstrate stability and allow the Division to approve a revision to allot <br />remain, the nature and configuration of the stockpiled material and its foundation must be <br />investigation and stability analysis should be geared towards the typical causative factors <br />failures, which are: <br />1) related to the character of the stockpile material, <br /> a) grain size, <br /> b) grain size distribution, <br /> c) grain shape (degree of angulazity or roundness), <br /> d) material hardness (durable or friable), <br /> e) plasticity, <br /> f) density and relative density, <br /> g) Moisture content, seepage, areas of saturation; <br />2) slope angle and slope height, <br /> a) including identification of the critical cross section, i. e., that slope cross section <br /> potential failure surface with the lowest safety factor, <br /> b) slope angle of the stockpile foundation; <br />3) storm water and snowmelt, <br /> a) runoff directions controls and velocities, <br /> b) storm water and snowmelt infiltration of the stockpile, <br /> c) potential for erosion of the stockpile -assuming that the stockpile is a non-cohe <br /> most likely to initiate in response to erosion rather than loss of shear strength, <br /> d) potential for undercutting of the stockpile during a large, e.g. one hundred year <br /> flood, <br />4) exi sting indications of instability or slope movement, <br /> a) tension cracks, <br /> b) bulging, slumping, or settlement <br /> c) seepage or saturation, <br /> d) erosion or undercutting; <br />5) Improper fill placement, <br /> a) poor compaction, <br /> b) lack of keyway and benches, <br /> c) slope over steepened or too high; <br />6) Fill foundation condition, <br /> a) nature of the foundation material (see item (1) above), <br /> b) ability to pass subdrainage, <br /> c) see also item (2)(b) above. <br />It is recommended that a number of test pits or borings be used to evaluate to consistency <br />consistency of the stockpiled materials and to obtain representative samples for physical t <br />Division will not specify the number or location of test pits or borings as this is best left tt <br />the person conducting the geotechnical investigation. A homogeneous stockpile on a dry, <br />foundation requires a less intensive investigation than a heterogeneous stockpile in a comb <br />The types of physical testing to be completed should include, at a minimum, grain size di: <br />M-1984-001 <br />Ober 6, 1000 <br />+the stockpile to <br />investigated. The <br />in most slope <br />contains the <br />fill a failure is <br />interval <br />or lack of <br />:sting. The <br />the discretion of <br />consistent <br />dex configuration. <br />ttibution and <br />