Laserfiche WebLink
iiiiiiiiiiiiiiiiiii <br />999 <br />• January 9. 198Q <br />'fo: La Plata Coal Corporation <br />Ceotechnlcal acd Stability Analysis, Proposed backfill configurations, <br />La Plata #1 Hine, La Plata County, Colorado, <br />INTRODUCTIONS The Mined Lam Reclamation Division has re ueated from <br />La Plata Coal Corporation said study per rule 2,05.4(2)~c) Reclamation <br />and Backfilling, <br />The analysis Sncludes <br />1) Slope Stability,. <br />2) Materials Strength Determination, <br />3) Detailed geotechnlcal knowledge of site. <br />SLOPE STABILITY <br />• The high wall slopes of the La Plata pl MSne were determined and <br />incorporated Sn the slope stability analysis. <br />There Sa one existing high wall at the Ia Plata NS Hine, It 1s <br />29 feet high vlth a length of approximately 300 feet. Slope of the <br />shales ar~d less competent beds was measured to be 4y°, 31ope of the <br />more competent beds xae measured as 62° which is to be expected, <br />MATERIAL <br />111gh wall slopesi Upper Menefee Formation, Mesa Yerde Group, <br />Upper Cretaceous in age. <br />Please find additional information regarding the Upper Menefee in <br />Mr. Fred Johnson's July 29, 1982 Geotechnlcal and Stability Analysts -~ <br />to National Klnp; Coal, Inc. <br />Detailed geologic study indicates no structural instability xi thin <br />the high malls. No shear zones or fractures were found to exist in <br />the high wall. <br />SLOPF, STABILITY OF FILL <br /> <br />See Mr. Fred Johnson's July 29, 1982 report to National King Coal, <br />Inc., as it contains the existing information regarding the material I ' <br />characteristics. <br />~ c1) <br />