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1 <br />.. <br />West Elk Coal Company, Inc. ~ III I II I II I II IIII III f~ <br />Post Office Box 591 999 <br />Somerset, Colorado 81434 ~ <br />Telephone 303 929 5015 " <br />July 9, 1984 <br />RECE6b'ED <br />Mr. Robert Liddle <br />Mr. Phillip Salleta <br />State of Colorado <br />Dept. of Natural Resources <br />Mine Land Reclamation Division <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80203 <br />Gentlemen: <br />JUL 161984 <br />pIIINED LAND RECLAMATION DIVISION <br />Colo. Dept. of Natural Resources <br />As you requested, please find attached a plan to repair <br />the slide area and the affected drainage system. This <br />plan is for the April, 1984 "landslide" (slump) which <br />is located between the portal bench and the upper di- <br />version ditches #2 and #4. The plan consists of <br />"Guidelines and Specifications", Drawings A, B, C and <br />D. <br />Since the slide was caused by water leakage from a break <br />in the existing buried 30 inch corrugated metal pipe (CMP), <br />the scarped area will be graded and resloped. The exist- <br />ing 30 inch CMP is broken in several places and we feel <br />it would not be wise to repair the pipe in its present <br />location since it cannot be easily monitored and any <br />subsequent movement of the old slide would cause a new <br />break. Placing the culvert on the surface will make it <br />easier to monitor, maintain, and correct any future <br />problems (see Figure A on Drawing A). The new 36 inch <br />half CMP will be set 16 inches in the surface. The <br />full 36 inch CMP will be used on the corners and by <br />the manhole (see Figure A on Drawing A). The new 36 <br />inch CMP will connect into the manhole at the same <br />location as the existing 30 inch CMP. <br />Ditches #2 and #4 empty into an area which was con- <br />structed of rip-rap to prevent erosion but was not <br />sealed with concrete to prevent leakage. This area <br />will be graded so the discharge from ditches #2 and #4 <br />will empty into the 36 inch half CMP. The headwall <br />will be installed with a 15' x 26' collection area <br />and will be sealed with shotcrete so no leakage can <br />occur (Figure B on Drawing A). <br />AMCO-6204 <br />