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• <br />r1 <br />• <br />August 15, 2001 <br />Lorencito Coal Company, LLC <br />clo Greystone <br />5231 South Quebec <br />Greenwood Village, Colorado 80111 <br />Attention: Mr. Mike Kolin <br />Mr. Jerry Koblitz <br />iii iiiiuiiiiiii iii <br />S~~ cC~~ll3~~ /3 /e~,, ~l <br />l <br />Subject: Addendum <br />Slope Analysis of Excess Spoil Fills 1, 2 and 3 <br />Lorencito Surface Mine, Phase I <br />Las Animas County, Colorado <br />Job No. 32,611 <br />CTLlThompson, Inc. previously reported Stability Analysis and Geotechnical <br />Recommendations for six excess spoil fills in Phase I (report dated 4127/01). We <br />understand Fills 1, 2 and 3 need to 6e added to the Phase I analysis. To <br />analyze these fills, we performed the following: <br />1. Visited each fill site to assess soil, bedrock and surface conditions, and <br />Classified the fills with respect to volume and slopes and also geometry, to <br />confirm the previous parametric stability analysis is valid for these fills. <br />Summary <br />Our investigation and analysis indicate the proposed location and <br />configurations of Fills 1, 2 and 3 result in stable fill meeting Colorado Division of <br />Minerals and Geology (CDMG) requirements. Design and construction <br />recommendations in our previous report remain valid. Keyways are not required for <br />these fills. Drains are required as discussed below.: <br />Fill Characteristics <br />The fills are relatively small (<0.2 Mcy). Geometric criteria such as height, <br />proposed outslopes, benches, base slope, etc. are within the limits of our previous <br />stability analysis. Fill characteristics are summarized below. <br />~,~-~ j <br />~#t' n eo~L~ <br />/~7, I~ 5~~;~'-~~ <br />i,,,l i~C~•~~S~kS <br />CTL/THOMPSON, INC. ~/ <br />CONSULTING ENGINEERS z'~/~~[ST <br />1971 WEST 12TH AVENUE ~ DENVER, COLORADO 80204 ~ (303) 825-0777 ~ p S <br />