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Preliminary Report for Data Recovery at Sites MK -1-082317 and MK -2-082317 Colowyo Coal Company <br />3.2 Site MK -2-082317 <br />Site MK -2-02317 is six thermal features and 19 pieces of randomly distributed debitage exposed <br />on a mechanically stripped surface ranging from approximately 10 cm to 20 cm below surface <br />within the haul road footprint immediately east of Moffat County Road 51 (Figure 13). The <br />horizontal extent of the site appears to be limited to the features within the disturbance area. The <br />debitage has been significantly disturbed by the mechanical stripping and its distribution does not <br />reflect prehistoric use of the locality. Tetra Tech will monitor any remaining ground stripping at the <br />location once the agencies approve resumption of work. <br />3.2.1 Artifacts <br />The 19 pieces of debitage found on the ground surface were mapped and collected for further <br />analysis. The debitage was all opaque white chert. No artifacts were recovered from the features; <br />however, floatation analysis may yield additional cultural material. The surface debitage is <br />currently being processed and analyzed in Tetra Tech's laboratory facilities. Further description <br />and documentation will occur in the laboratory. Interpretations could change depending on the <br />results of subsequent analysis. <br />3.2.2 Shovel Test Probes <br />A single line of STP's (A1 through A9) was completed within the intact sediments immediately <br />outside the haul road limit of disturbance. No cultural material was recovered from any of the <br />STP's. The shovel tests encountered two stratigraphic units. The upper unit is a sand silt loam <br />lacking gravels averaging between 10 and 30 cm in depth. The lower unit is a compact silt loam <br />lacking gravels. The interface between the two units clear with only minor gradation. The PI <br />determined that the site cultural component likely originated in the upper stratum with the features <br />being dug into the lower stratum. Therefore the STP's were excavated 10 cm into the culturally <br />sterile lower stratum. <br />3.2.3 Cultural Features <br />The following section summarizes the information gathered from the investigated features (Table <br />2). Features 1 through 7 were defined during site discovery and Feature 8 was defined during <br />data recovery field work. Features 3 and 7 were determined to be natural. Investigations into the <br />two features were ended in the field and no further discussion is provided. The data recovery <br />technical report will include more in-depth presentations when laboratory analysis results are <br />completed. Any interpretations presented here could change pending post -field work analysis <br />results. <br />Tetra Tech September 29, 2017 13 <br />