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ACZ ACZ Inc. <br />Englneering and Environmental Services <br />1475 Pine Grove Road, Suite 205 <br />P.O. Box 774018 <br />Steamboat Springs, Colorado 80477 <br />303-879-6260 <br />November 27, 1990 <br />Mr. Brent Anderson <br />Parcel, Mauro, Hultin & Spaanstra, P.C. <br />1801 California Street, Suite 3600 <br />Denver, Colorado 80202 <br />Re: Rockcastle Company -Evaluation of Previously Identified Areas of Surficial <br />Instability <br />Dear Mr. Anderson: <br />On Wednesday, 14 November 1990, I inspected the areas of suficial instability <br />identified in the 23 October 1985 report titled, "Response to Stipulation No. 2, <br />Grassy Gap Mine. The purpose of the inspection was to determine the current <br />status of the subject areas and identify any remedial measures necessary to insure <br />long-term stability. <br />My inspection included all of the potentially unstable slope segments identified in <br />the original report except Segment No. 3 which was reviewed in a previous report <br />(ACZ Inc., 10/1/90) and Segment 10 which was inaccessible due to muddy road <br />conditions. For each slope segment, toe and crest/scarp areas were examined, <br />general configuration and attitude of the slide block(s) was noted, drainage patterns <br />were identified, extent of vegetative reestablishment was determined, and any <br />evidence of recent instability or other factors affecting stability were observed and <br />recorded. Observations from the field inspection are documented by the attached <br />field inspection report. <br />All of the slide areas inspected are currently stable with no evidence of recent or <br />progressive movement. Given that the subject slide areas are currently stable, the <br />primary concern relative to long-term stability becomes any existing conditions or <br />factors which could contribute to destabilization and reactivation of slide masses. <br />Such factors would include existing oversteepened slopes, undercutting of the toe, <br />l and poor drainage. None of these conditions exist for any of the slide areas II~ <br />I I inspected. However, far Slides 1 and 4, the proximity of the existing drainage ditch <br />