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Cultural Resource Historic Properties Treatment Plan for BK -2-082818 Colowyo Coal Company <br />3.2.2 Site Specific Data Recovery Tasks <br />The following data recovery tasks will be applied to the site in support of the research design. The <br />two site specific tasks are: A) Feature Data Recovery and B) 1 by 1 m Test Unit Excavation. <br />Feature 1 is a possible thermal feature of dark stained sediment with charcoal and five pieces of <br />sandstone heat altered rock. As currently exposed, it measures 25 cm long by 30 cm wide. <br />Feature depth is currently unknown. The feature will be fully excavated as outlined in Section <br />3.2.3.2. The recovered material and samples will be analyized as outlined in Section 3.3. <br />A 1 by 1 m test unit will be excavated within the remaining intact sediments either around or <br />adjacent to Feature 1. The unit will be exacavated using the methods outlined in Section 3.2.3.1. <br />The unit will provide a controled means for investigating the potential of a possible living surface <br />in which the feature was created and utilzied. Sedimentary profiles of the unit walls will be drawn <br />of the remaining intact sediments on site. The profiles will assist in the geoarchaeological and <br />taphonomic assessments of the site. <br />3.2.3 Data Recovery Methodology <br />The following methods are based on current archaeological theory and method. Documentation <br />of on-site work will utilize Tetra Tech's cultural resource electronic and paper based recordation <br />forms. Form types include, but are not limited to, photographic logs, artifact catalogs, excavation <br />unit, feature excavation, and daily progress tracking forms. The Principal Investigator (PI) will be <br />responsible for reviewing all forms and data collected in the field on a nightly basis to ensure the <br />data is correct as well as stored and filed properly. <br />An electronic 1 by 1 m grid with a primary datum will be established over the site using the Trimble <br />GEOXM. The GPS will also be used for artifact point provenance, overall site mapping, and <br />structural feature mapping. UTM coordinates will be recorded in NAD83, Zone 13 North. The 1 <br />by 1 m excavation unit(s) will correlate to the overall gird. Photographs will be taken using a digital <br />camera with at least a seven -mega pixel resolution. Site overview photograph positions will be <br />GPS point located. Project photologs will be maintained and record the date, camera, exposure <br />number, subject, orientation, and GPS derived UTM coordinates for overview photographs. <br />Collected artifacts will be placed in plastic bags with labels detailing the bags content, catalog <br />number, provenience information, name of collector, and date of collection. Collected artifacts will <br />be transported to Tetra Tech's Salt Lake Office laboratory for cleaning and analysis. Collection <br />process for surface artifacts will also be applied to subsurface artifacts. Artifacts recovered from <br />screened matrix will be collected per general class with appropriate provenience information for <br />sorting and analysis in a laboratory setting. <br />3.2.3.1 Unit Excavation <br />At least one excavation unit will be opened as needed to further investigate the potential for further <br />subsurface cultural material and/or to define a potential living surface. The PI will use professional <br />judgement to determine if a signal, multiple, or even blocks of units are excavated. Any <br />encountered subsurface artifacts will be electronically point provenienced, cataloged, then <br />collected. <br />All 1 by 1 m excavations will be completed using manual excavation techniques. A qualified <br />archaeological technician will hand excavate using a flat bladed shovel and trowel as necessary. <br />Tetra Tech June 29, 2018 7 <br />