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Ralston Quarry Slope Stability <br /> Remedial Measures Any additions to the stockpile also should be placed so that a <br /> maximum slope angle of 3:1 (horizontal : vertical) is maintained. The stockpile slopes <br /> should be protected from erosion. Minor raveling or surficial sloughing should be <br /> anticipated on the slopes until vegetation is well re-established. <br /> The final configuration of the stockpile should be designed to direct surface water away <br /> from the taller northern and western slope faces and into appropriate drainage <br /> pathways. Periodic maintenance of the stockpile should be performed to correct ponded <br /> areas and re-establish effective surface drainage as well as repair sloughed or eroded <br /> areas on the slopes. <br /> Zone 2 — The Southern Slope The extent of this zone is shown below on a May 31, <br /> 2018, Google Earth® image. Tailings were placed on this portion of the original, west- <br /> facing slope over the same general time frame as the portions of the slope farther north. <br /> t <br /> e # ✓fit ' <br /> d_ <br /> Zone 2 and Section A—A' <br /> Job No. 18-3046 GROUND Engineering Consultants, Inc. Page 12 <br />