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<br />• Analysis or design related to permanent surface water control or evaluation of <br />potential acid or toxic properties of the spoil was not within the scope of this <br />investigation. <br />BASIS FOR EVALUATION <br />Our understanding of fill configurations and proposed construction procedures <br />is based upon discussions wkh Greystone. Documents provided by Greystone for our <br />review included: <br />1. A plan of disposal area locations and topography (Fig. 1). <br />2. Geology and Soils Baseline Technical Reports (October 1996, draft <br />copies), and <br />3. Water Resources Map (by Greystone, Map 2.04.7-1). <br />•" We also considered CTUThompson, Inc.'s previous investigations at the <br />Lorencito site, experience at the nearby New Elk/Golden Eagle Mine sites, and other <br />spoil/waste fill designs in sedimentary rock areas along with technical publications to <br />develop our opinions. A list of references is provided at the end of this report. Based <br />upon this we performed a site specific investigation for the proposed fills. <br />FILUEMBANKMENT CHARACTERISTICS <br />Phase I of the Mine Plan includes: <br />1. Surface mining of the ridgetop (Fig. 1). This is referred to as area mining. <br />The spoil will be placed to approximate original contours where possible. <br />2. Six excess spoil fills (No. 4 through 9, Fig. 1) have been identified. <br />3. Six sedimentation pond embankments will be constructed below the <br />excess fills. <br />• LORENCITO COAL COMPANY, LLC <br />LORENCITO SURFACE MINE -PHASE I <br />CTLR 32, 611 <br />2 <br />