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Preliminary Report for Data Recovery at Sites MK -1-082317 and MK -2-082317 Colowyo Coal Company <br />3.1.3.3 Feature 3 <br />Feature 3 is a small, shallow, thermal feature measuring approximately 35 cm north to south by <br />30 cm east to west (Figures 9 and 10). Actual top of the feature is unknown; however, the feature <br />appears to be approximately 20 cm below ground surface. The feature size and location <br />immediately south of Feature 1 necessitated one 1 by 1 m unit being established to investigate it. <br />The feature's depth below the mechanically exposed surface is 12 cm below the 119N 200E unit <br />datum. Overall feature shape appears to be roughly circular in planview with a lenticular profile. <br />Minor root action is slightly distorting the overall shape. Feature fill consisted of dark stained <br />sediment (2.5Y2.5/1, Black); sparse charcoal flecking; and unaltered rock. The five pieces of rock <br />do not appear to have been thermally altered; therefore were not analyzed as HAR. The location, <br />size, and content of the feature suggests it may be the remains of cleanout of Feature 1. <br />Figure 9. Site MK -1-082317, Feature 3, Pre -Excavation, facing west. <br />Tetra -,ecn September 29, 2017 10 <br />