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Colowyo Coal Company <br />2014 Annual Reclamation and Hydrology Report <br />SECTION 8 - REGRADED OVERBURDEN SAMPLING <br />RULE REOUIREMENT <br />Sampling of regraded overburden is performed at a density of one sample per five acres <br />of regraded area (PAP Exhibit 6, Item #4, Colowyo letter of January 4, 1983). Colowyo <br />recognizes the potential for elevated SAR values. Threshold SAR values for special <br />handling are identified as "suspect levels ". The SAR "suspect level" at Colowyo is 15 <br />(PAP, Exhibit 6, Item #4, Colowyo letter of January 4, 1983). Remedial measures <br />consist of additional samples to determine the extent of the suspect material (PAP, <br />Exhibit 6, Item #4, Colowyo letter of January 4, 1983). If the aerial extent is greater than <br />one acre, it is to be covered with at least five feet of acceptable material. See Figure 8 -1 <br />for permit commitment documentation. <br />GENERAL DISCUSSION <br />2014 Sampling and Laboratory Analysis - Colowyo sampled 9 locations of regraded <br />overburden during 2014 (See Figure 8 -3 for location of tracking sheet). Specific <br />overburden sample suspect levels can be referenced in Figure 8 -2. <br />During 2014, no sample results exceeded parameter thresholds. <br />Page 8 -1 <br />