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Preliminary Report for Data Recovery at Sites MK -1-082317 and MK -2-082317 Colowyo Coal Compan <br />use of the locality. Vertically, five shovel tests and one non -feature test unit each recovered one <br />piece of debitage between 0 and 30 cm below the scraped surface. The PI determined the <br />encountered subsurface material does not reflect an intact cultural component requiring further <br />investigation. <br />3.1.1 Artifacts <br />The 36 pieces of debitage and one early stage biface found on the ground surface were mapped <br />and collected for further analysis. An additional six pieces of debitage were recovered by STP's <br />and excavation of one test unit. The debitage was all opaque white chert and the biface is a <br />reddish brown chert with dark gray inclusion. No artifacts were recovered from the features; <br />however floatation analysis may yield additional cultural material. The artifacts are currently being <br />processed and analyzed in Tetra Tech's laboratory facilities. Further description and <br />documentation will occur in the laboratory. Interpretations could change depending on the results <br />of subsequent analysis. <br />3.1.2 Shovel Test Probes <br />Four lines of STP (A through D) were completed within the mechanically scraped sediments <br />immediately within the haul road limit of disturbance. The parallel lines were placed to transect <br />roughly north to south through the cultural features identified at the site. The number of shovel <br />probes completed in each line depended on the testing results. STP's A2, A5, B5, A6, and D5 <br />each yielded a single piece of debitage. The cultural material occurred at varying depths from 0- <br />10 to 20-30 cm below scraped surface level. <br />The majority of STP's encountered one stratigraphic unit. The unit is a pale brown (10YR6/3) clay <br />loam lacking gravels averaging between 30 cm in depth below the scraped surface. STP's D6 <br />and D5 encountered a pale brown (10YR6/3) sand loam with sparse rounded gravels at an <br />average depth of 10 cm below the scraped surface. Test Unit 180N 195E was excavated <br />immediately west of the two STP's to determine if the stratum change was potentially cultural in <br />nature. One piece of debitage and one bone fragment were encountered in the 0-10 cm level; <br />however it was associated with the clay loam strata encountered across the site. The lower <br />stratum was determined to likely be an anomalous natural lens with no cultural significance and <br />excavations were halted at 20 cm below datum floor. Due to the lack of intact sediments at the <br />site, it could not be determined if the cultural component occurred entirely within clay loam strata <br />or an upper strata removed during mechanical stripping. <br />3.1.3 Cultural Features <br />The following section summarizes the information gathered from the investigated features (Table <br />1). Features 1 and 2 were defined during site discovery and Features 3, 4, and 5 were defined <br />during data recovery field work. Feature 4 was determined to be natural. Feature 4 investigations <br />were ended in the field and no further discussion of the feature will be 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 />3.1.3.1 Feature 1 <br />Feature 1 is the remaining portions of a roughly circular thermal feature measuring approximately <br />73 cm north to south by 60 cm east to west (Figures 5 and 6). Actual top of the feature is unknown, <br />but it appears to have been approximately 20 cm below ground surface. The size and location of <br />Tetra Tech September 29, 2017 6 <br />