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Species considered threatened or endangered in Colorado and potentially <br />occurring at the study area were determined by review of the USDA-USDI (1979) <br />publication, An Illustrated Guide to the Proposed Threatened and Endangered <br />Plant Species in the Rocky Mountain Region, the Federal Register listing of <br />Threatened and Endangered Species (USDI 1980) and a query of information <br />contained with the Colorado Natural Heritage Inventory. <br />2.3 STUDY AREA DEFINED <br />The study area for the vegetation inventory was, defined as those lands <br />containing the proposed surface disturbance areas, buffer areas, and <br />adjacent reference areas consisting of approximately 9724.6 acres. Although <br />not required by CMLRD regulations, the entire boundary was included in the <br />vegetation sampling rather than just areas where surface disturbance are <br />contemplated. This study plan allowed for more flexibility in mine plan <br />design, area disturbance and a broader vegetation database from which to draw <br />conclusions. <br />2.3.1 SAMPLING DESIGN <br />Study area and reference area sample sites were randomly selected prior <br />to conducting quantitative studies in the field. The sampling sites were <br />located by establishing a grid on the blue-line photomosaic base maps (scale <br />1" = 400') along north-south and east-west grid lines with spacings of 1/4" <br />(100' ground distance). Grid lines were numbered consecutively along two <br />axes and pairs of random numbers were plotted utilizing a random numbers <br />table. Sampling sites were located in the field as close to the map location <br />as possible. All sampling sites were indicated on the vegetation map 2.D (in <br />pockets). <br />3 <br />Exhibit ]0, Item 5 Revision Date: 03/06/07 <br />8 Revision No.: PR-02 <br /> <br />• <br /> <br />