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Preliminary Report for Data Recovery at Sites MK -1-082317 and MK -2-082317 Colowyo Coal Company <br />2.2 Feature Data Recovery and 1 by 1 m Units <br />An electronic 1 by 1 m site grid with a primary datum was established over each site. Individual <br />units, surface artifacts, and features were point plotted using a GeoExplorer 6000 series GeoXH <br />using UTM coordinates recorded in NAD83, Zone 13 North. Within each unit, provenience was <br />recorded using a sub -datum (usually southwest corner of the unit), string, line level, and tape. <br />For each feature, the appropriate number of 1 by 1 m units were established around their <br />horizontal extent to maintain horizontal and vertical control during data recovery. Only the features <br />were excavated within each units. One non -feature 1 by 1 m unit was excavated at Site MK -1- <br />082317. The unit was placed adjacent to two shovel test probes (probe numbers D5 and D6) that <br />encountered a sedimentary profile the PI determined needed additional investigation as a <br />possible buried horizon. The test unit excavation results are summarized in Section 3.1. The PI <br />determined that no non -feature 1 by 1 test units were needed at Site MK -2-082317. <br />At both sites, features identified by the monitor during initial discovery and any additional features <br />identified during data recovery field work were subjected to the methods outlined in the HPTP <br />with one exception. Due to the small size of each feature, all feature fill was collected as bulk <br />feature fill samples for flotation analysis. None of the fill was screened through 1/8 inch screen. <br />Field findings and observations at each feature are detailed in Section 3.2. <br />2.3 Artifact and Sample Collection <br />Artifacts found on the surface, STP's, and test units were documented and collected as outlined <br />in the HPTP. The collected artifacts at Site MK -1-082317 includes 36 pieces of debitage collected <br />from the mechanically stripped surface and an additional five pieces of debitage from shovel tests. <br />The test unit yielded one piece of debitage and one piece of undetermined mammal bone. The <br />collected artifacts at Site MK -2-082317 includes 19 pieces of debitage collected from the <br />mechanically stripped surface. No additional artifacts were observed during feature or shovel <br />probe testing. Further information regarding the collected artifacts will be provided in the final Data <br />Recovery Technical Report after laboratory analysis is completed. <br />All feature fill was collected as bulk feature fill samples for flotation analysis. Radiocarbon samples <br />were collected from each feature. Heat altered rock (HAR) recovered within the features was <br />sorted by size class, counted, and weighed per feature in the field as outlined in the HPTP. <br />3.0 HPTP FIELD WORK RESULTS <br />The following is an investigated artifact and feature summary for cultural manifestations <br />excavated during field work efforts at each site. Descriptions and interpretations presented here <br />are considered preliminary pending further laboratory and post -field work analysis of the collected <br />data. <br />3.1 Site MK -1-082317 <br />Site MK -1-082317 is three thermal features and 36 pieces of randomly distributed debitage <br />exposed on a mechanically stripped surface approximately 20 cm below surface within the haul <br />road footprint immediately west of Moffat County Road 51 (Figure 4). No other cultural material <br />or intact sediments were defined during field work at the location. The horizontal extent of the site <br />appears to be limited to the features within the disturbance area. The debitage has been <br />significantly disturbed by the mechanical stripping and its distribution does not reflect prehistoric <br />Tetra Tech September 29, 2017 <br />