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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />SECTION 4 - REGRADED OVERBURDEN SAMPLING <br />RULE REOUIREMENT <br />Please see Section 2.05.3 in Volume 1 for information on Colowyo's overburden <br />monitoring program. <br />GENERAL DISCUSSION <br />2017 Sampling and Laboratory Analysis - Colowyo sampled 16 locations of regraded <br />overburden during 2017. Specific overburden sample suspect levels can be referenced in <br />Section 2.05.3 in Volume 1. <br />During 2017, no sample results exceeded parameter thresholds. Please see Figure 4-1 for <br />analytical results for all samples taken in 2017. <br />Page 44 <br />