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Ralston Quarry Slope Stability <br /> An exposure of the native colluvial soils in Zone 5 is shown in the recent photograph <br /> below. <br /> i ^4 <br /> r 4 � <br /> r <br /> k <br /> Colluvial Soils Exposed in Trail Cut in Zone 5 <br /> No retention pond was constructed at the toe of slope in this zone and no slope failures <br /> have developed on this reach, based on reports from Asphalt Paving Company <br /> personnel and review of historic aerial photographs as old as 1999. <br /> Remedial Measures Because of the apparent stability, historically, of this zone of the <br /> slope and because it remains nearly in its undisturbed configuration, we do not consider <br /> remedial earthwork or other remedial measures necessary for this zone. The slope <br /> should be observed periodically for indications of instability or excessive erosion, <br /> particularly after heavy precipitation events. <br /> Job No. 18-3046 GROUND Engineering Consultants, Inc. Page 24 <br />