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• <br />__ <br />-_ <br />iii iiiiiiiiniuiii <br />7tittleApplegate,lnc. <br />Consultants for Land, Mineral and Water <br />Mazch 2, 2000 <br />Christina L. Kamnikar <br />Division of Minerals and Geology <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />RE: Second Technical Adequacy Review of Slope Stability Analysis, Riverview Resources <br />#M-99-098 <br />Deaz Christina: <br />The following information is being provided based on telephone conversations with you and <br />Jason Murray of our office with reference to your review of the Slope Stability.Analysis, dated <br />Mazch 1, 2000. <br />We believe that the modeling techniques used in our analysis aze reasonable and <br />appropriate for the conditions [hat will exist during mining. The location of the phreatic <br />line through the face of the model for all practical purposes does put water at the toe of <br />the slope. We believe this is a reasonable analysis. Please see attached data. <br />2. While you do not cleazly state what you believe would be appropriate setbacks, for the <br />highwalls nor are the soil properties shown in the table appropriate representations for <br />modeling, we will commit to working with you to determine a set of safety factors and <br />setbacks. <br />A fence adds no structural loading to the model and only needs to be graphically <br />represented. We will commit to submitting the model with the fence drawn in. As we <br />discussed, this will not effect the analysis. <br />4. In our discussion, it was determined that that our initial water table delineation and that <br />assumed effects on the phreatic surfaces was five feet shallower than the information in <br />the Terrecon report. We believe, that this does represent a worst case scenario. <br />Although a drop might not be uniform, it will occur and be lower than water table levels <br />found when the property was drilled with no dewatering occurring. The DMG has <br />observed this in all gravel pits [hat they inspect where dewatering and high groundwater <br />table exist. <br />11990 Grant St. • Suite 304 • Denver, CO 80233 5441 Boeing Drive. • Suite 200 • Loveland, CO 80536-8855 <br />(303) 452-6611 • Fax (303) 452-2759 (970) 461-9884 • Fax (970) 613-1177 <br />