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Ralston Quarry Slope Stability <br /> Zone 4— The Area of the Earliest Failure The boundaries of Zone 4 are shown on the <br /> May 31, 2018, Google Earth' image below. The outline of a previous slope failure is <br /> visible within the zone, indicated by the red arrow. <br /> h •� .. <br /> p <br /> P. <br /> Zone 4 - <br /> (Zone.3) <br /> Zone 4 with Scarp Area of Prior Slope Failure Indicated by the red arrow <br /> In 2010, the area was re-graded by Asphalt Paving Company to construct a buttress and <br /> directing surface water away from the toe area of the failure. The result of this earthwork <br /> can be seen in the June 15, 2010, Google Earth' image on the next page. <br /> Job No. 18-3046 GROUND Engineering Consultants, Inc. Page 18 <br />