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STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Deparrmenl of Natural Resource, 13U Sherman 51.. Rnom ?15 Denver, Coluradn 80?03 Phone: (1031 866-3567 FA%~ (303183? 81 U6 DATE: February 7, 1996 TO: David Berry FROM: Jim Pendleton ~-`~ ~~~~~ DEPhRTMENT OF NATURAL RESOURCES Roy Roma Governor lames 5 Uxhhead Ereculive Diretlor h1i<hael l1 Lung Divrsion Dneclor RE: Mountain Co Co any, West Elk Mine, 4th Quart 5, Gob Pile Density Testing and Slope Survey Data Reports (Permit No. C-80-007) . I have reviewed the collection of materials you forwarded to my attention, which included the fourth quarter 1995 compaction monitoring and slope stability monitoring data for the Lower Refuse Pile at the West Elk Mine. That packet included compaction reports and proctor test records conducted at the Lower Refuse Pile during the fourth quarter of 1995. It also included visual inspection report summaries for both the Lower Refuse and the Lone Pine Gulch piles. Apparently insufficient material had been deposited at Lone Pine Gulch to warrant density testing. Proctor and Density Test Reporting In response to my earlier requests, Norm Johnston of Lambert & Associates has amended the proctor test reporting procedures and the field sampling methodology. The changes will solve the earlier recurring reporting problems. Character of the Waete The Proctor results and the field gradation results do demonstrate the character of the waste encountered this test episode. The materials are approximately 40% to 50% coarser than 3/4" by weight. While this does not qualify as durable rock it is an abnormally large proportion of coarse rock. It does explain the variation in density results due to coarse debris within the detection sphere. Slope Stability Monitoring The survey monitoring data demonstrates the monitored slopes to be performing well.