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2011-01-19_REVISION - C1981019 (7)
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2011-01-19_REVISION - C1981019 (7)
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Last modified
8/24/2016 4:29:09 PM
Creation date
1/20/2011 1:57:25 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
REVISION
Doc Date
1/19/2011
Doc Name
Updated 2011 2009 Phase III Bond Release Evaluation - Year 2
From
Colowyo Coal Company
To
DRMS
Type & Sequence
SL5
Email Name
JRS
SB1
Media Type
D
Archive
No
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2.0 METHODOLOGY FOR VEGETATION SAMPLING/ COMPARISON METHODS <br />2.1 Sample Site Selection / Location <br />The sample layout protocol for revegetation evaluations in 2008 and 2009 largely followed Colorado <br />Division of Reclamation, Mining, and Safety (CDRMS) approved procedures developed by Cedar Creek to <br />provide unbiased, representative, and cost-effective data for evaluation of revegetation. These <br />procedures are designed to better account for the heterogeneous expression of vegetation within the <br />various reclaimed areas while precluding bias in the sample site selection process. By design, the <br />procedure is initiated randomly, and thereafter, samples are located in a systematic manner, along grid <br />coordinates spaced at fixed distances (e.g., 200 ft. x 200 ft. as demonstrated in Figure I and Maps I <br />through 6). In this manner, representation from across the entire reclaimed area is forced rather than <br />risking the chance that significant pockets (or seedings) are entirely missed, or overemphasized as often <br />happens with simple random sampling. <br />The systematic procedure for sample location in the revegetated units occurred in the following <br />stepwise manner. First, a fixed point of reference was selected for the unit to facilitate location of the <br />systematic grid in the field. Second, a systematic grid of appropriate dimensions was selected to provide <br />a reasonable number of coordinate intersections (e.g., 20 or 30) that could then be used for the set of <br />sample sites. Third, a scaled representation of the grid was overlain on a computer-generated map of <br />the target unit extending along north/south and east/west lines. Fourth, the initial placement of this grid <br />was implemented by selection of two random numbers (an X and Y distance) used for locating the first <br />coordinate from the fixed point of reference, thereby making the effort unbiased. Fifth, where an excess <br />number of potential sample points (grid intersections) was indicated by overlain maps, the excess points <br />were randomly chosen for elimination. (If later determined that additional samples would be needed, the <br />eliminated potential sample sites would be added back in reverse order until enough samples could be <br />collected.) Sixth, utilizing a GPS or handheld compass and pacing techniques (or a hip-chain), the <br />sample points were located in the field. <br />Once a selected grid point was located in the field, ground cover sampling transects were always <br />oriented in the direction of the next site to be physically sampled to further limit any potential bias while <br />facilitating sampling efficiency. This orientation protocol is indicated on Figure I. Depending on logistics, <br />timing, and access points to the target sampling area, the field crew would occasionally layout a set of <br />points along coordinates in one direction and then sample them in reverse order. However, orientation <br />protocol was always maintained (i.e., in the direction of the next point to be physically sampled). If the <br />boundary of an area was encountered before reaching the full length of a transect, the orientation of the <br />CEDAR CREEK ASSOCIATES, Inc. Page 4 Colowyo Coal Company <br />2009 Phase III Bond Release Evaluation
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