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BLM and the State Historic Preservation Officer (SHPO). The final determination of site <br />significance is made by the BLM in consultation with the SHPO and the Keeper of the <br />Register. <br />The Code of Federal Regulations was used as a guide for the in -field site evaluations. <br />Titles 36 CFR 50, 36 CFR 800, and 36 CFR 64 are concerned with the concepts of <br />significance and (possible) historic value of cultural resources. Titles 36 CFR 65 and 36 <br />CFR 66 provide standards for the conduct of significant and scientific data recovery <br />activities. Finally, Title 36 CFR 60.4 establishes the measure of significance that is critical to <br />the determination of a site's NRHP eligibility, which is used to assess a site's research <br />potential: <br />The quality of significance in American history, architecture, archaeology, and culture <br />is present in districts, sites, buildings, structures, and objects of State and local <br />importance that possess integrity of location, design, setting, materials, workmanship, <br />feeling, and association, and a) that are associated with events that have made a <br />significant contribution to the broad patterns of history; or b) that are associated with <br />the lives of persons significant in our past; or c) that embody the distinctive <br />characteristics of a type, period, or method of construction, or that represent the work <br />of a master, or that possess high artistic values, or that represent a significant and <br />distinguishable entity whose components may lack individual distinction; or d) that <br />have yielded, or may be likely to yield, information important in prehistory or history. <br />In order for a site to be listed in the NRNP, it must not only be shown to be significant <br />under the National Register criteria, but it also must have integrity. Integrity is the ability of <br />the resource to convey significance. If significance has been established, it is necessary to <br />determine if the resource retains the integrity for which it is significant. Within the concept <br />of integrity, the National Register criteria recognizes seven aspects or qualities that, in <br />various combinations, define integrity. The seven aspects of integrity include: Location, <br />Design, Setting, Materials, Workmanship, Feeling and Association. To retain integrity, a <br />property will always possess several, and usually most, of the aspects. <br />FIELD METHODS <br />A 100 percent intensive (Class III) cultural resource survey of the study area, which <br />encompassed an 860 acre block for lease modification, was conducted by two archaeologists <br />walking transects spaced at 15 meter intervals to cover the block area. The field <br />archaeologists worked from USGS 7.5 minute series maps. A total of approximately 860 <br />acres of private land (fee surface/federal minerals) was subjected to intensive inventory. <br />Cultural resources were sought as surface exposures and were characterized as sites or <br />isolated finds. A site is the locus of previous (50 year minimum) human activity at which the <br />preponderance of the evidence suggests either one-time diagnostically interpretable use or <br />16 <br />