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A III IIIIIIIIIIIIIIII 999 ,: STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Dupan mem of Nawral Resources I ~ 1 ] Sherman 51., Roam 215 Denvcr. Colorado N0203 Phnne' 11031 866-3567 FA%' 131131 R:t2 8106 March 7, 1994 Mr. Murari P. shrestha, P.S. Assistant Manager of Engineering Aestern Fuels - Utah 405 DTban St. X305 Lakewood, Colorado 80228 Re: Compaction Testing for Abatement of NOV C-93-156 Dear Mr. shrestha: I~~~~ DEPARTMENT OI NATURAL RESOURCE` RoY Rnmei Guvemo~ ken Salazar E.emo~e Dverhv nLC hacl H. Lund; Di. is inn Dn rcu.. The Division has reviewed your Refuse Pit Pilot Compaction Study and found that the results adequately demonstrate a lack of significant bias for the proposed method (dozer excavation to the desired testing depths). The attached map shows the approximate locations that the Division proposes for the compaction testing. The locations are approximate, and the Division wishes to advise WFU that the testing sites should be on top of the pile and not on the slopes. However, the sites should be located close to the edge of the pile, as these areas are less likely to be heavily trafficked. Therefore, if areas of low compaction do exist in the pile, they would be more likely to be located near the edges than in the more heavily trafficked areas. The data obtained from the pilot study may be used as part of the abatement submittal as requested. However, as the pilot study only went to a depth of 6 feet, the same site should be tested to a depth of 15 feet as originally agreed, unless WFU can provide documentation that compaction testing had been performed in that area to the elevation at which the pilot test was done. In phone conversations with Bill Lepro of the Deserado Mine, Mr. Lepro indicated that the western half of Refuse Pile RP-4 is currently covered with piles of refuse in drying piles. If the piles have made the western half of the pile inaccessible with a dozer, then the testing sites on the western half of the pile will need to be tested in the spring after the piles have been spread. However, the eastern sites will have to be tested by March 15, 1994 in order to meet the abatement deadline for the NOV.