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<br />Mr. Norm Roche <br />March 7, 2001 <br />Page 3 <br />Inc <br />Structure Approximate Distance <br />From Mine Limits (ft) Approximate Distance <br />From Mine Highwall (ft) <br />Farm and equipment buildings cluster on <br />St. Vrain Road <br />30 (closest) <br />70 (closest) <br />Reginald Golden House on St. Vrain Rd 120 220 <br />Gellar House on Saint Vrain Road 175 420 <br />Bergen House on Saint Vrain Road 30 125 <br />Homestead house and buildings on North <br />75'" Street within site 200 (closest) <br />Sasaki House on west side of N 75'" St 150 230 <br />Walsh House on west side of N 75" St 150 230 <br />North 75'" Sheet and utilities 0 50 <br />West Pella Pond 10 50 <br />East Pella Pond 10 80 <br />Railroad 10 65 <br />Waterline easement on east side of site within site 60 <br />STABILITY ANALYSIS <br />We performed stability analyses in order to evaluate [he potential for damage [o permanent man-made <br />structures. The analyses were performed using the XSTABL slope stability computer program. Stability <br />analyses were run on 100 randomly generated slip circles generated at the structure in question and the <br />base of the mine highwall using the simplified Bishop method. No laboratory soil strength analyses were <br />performed. The soil strength parameters input into the program are typical values for the anticipated soils <br />based on our experience and are listed in the following table: <br />Material Total Unit <br />Weight (pct) Saturated <br />Weight (pci) Effective <br />Cohesion (pcf) Effective <br />Friction Angle <br />(degrees) <br />Overburden 114 126 0 28 <br />Sand and Gravel 130 137 0 35 <br />Claystone 124 134 100 27 <br />The analyses were performed on six different slope geometries based on differing mine depths, differing <br />