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proper chain of custody via FedEx to ELI. Soft tissue was analyzed for uranium and the bone <br />was analyzed for Ra 226. <br />2.12 Cultural Resource Inventory <br />A Class III cultural resources inventory was performed to identify any cultural resources within <br />the proposed project areas of potential effect (APE), and to assist the National Register of <br />Historic Places (NRHP) in the evaluation and management of cultural resources which may be <br />affected by the proposed undertakings (i.e., those that lie within the defined APE). The work <br />was performed consistent with Colorado Historical Society Office of Archaeology and Historic <br />Preservation guidelines for conducting cultural resource inventories in Colorado. Discovered <br />cultural resources were (and will be) evaluated using the criteria established for NRHP eligibility <br />(36 CFR §60.4 a-d). <br />The proposed APE was inventoried by walking a series of parallel transects spaced no more than <br />twenty meters apart. Special attention was given to areas of enhanced subsurface visibility, such <br />as erosion cuts, road ditches, anthills, and the back-dirt of animal burrows. Discovered cultural <br />materials were classified as sites or isolated findsg, documented on appropriate Colorado <br />cultural resource survey forms, and plotted on the appropriate 7.5-minute USGS topographic <br />quadrangle maps. The full extent of each site was delineated, a site sketch map created, and <br />digital photographs taken of the site area and any distinctive features. Diagnostic artifacts also <br />were photographed. Global Positioning System (GPS) readings were taken, as appropriate, to <br />assist in locating and mapping sites. GPS readings were differentially corrected and post- <br />processed for accuracy. No cultural materials were collected during the inventory. No <br />laboratory analyses were performed as part of the program. <br />2.13 Noise Survey <br />A noise survey was performed to establish baseline noise levels at key locations of the proposed <br />Centennial project site. The focus of study is Centennial North as it is the least populated (and <br />thus likely to have the lowest noise levels). It is the zone where the majority of construction <br />would take place, where the proposed central processing facility would be located (in the NE <br />For documentation purposes, a cultural resource a site is defined as a location of past human activity that took place <br />over 50 years ago and which left physical traces of that activity in the form of (1) an intact cultural feature, (2) five or more <br />artifacts found within about 60 m of each other, and/or (3) an intact subsurface cultural deposit regardless of the number of <br />artifacts. <br />s An isolated find is a location with four or fewer artifacts or one that is identified by the archeologist(s) as <br />representing an area of very limited past activity. Isolated finds are considered not eligible for nomination to the NRHP due to <br />their limited potential for providing further important archaeological data. <br />April 2009 15 Site Characterization Plan