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2011-12-21_REVISION - C1991078
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2011-12-21_REVISION - C1991078
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Last modified
8/24/2016 4:46:24 PM
Creation date
12/22/2011 10:54:38 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1991078
IBM Index Class Name
REVISION
Doc Date
12/21/2011
Doc Name
Bond Release Application
From
J.E. Stover & Associates, Inc
To
DRMS
Type & Sequence
SL3
Email Name
MLT
SB1
Media Type
D
Archive
No
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2.0 SAMPLING METHODS <br />2.1 Sample Layout <br />The sample layout protocol for revegetation evaluations in 2010 and 2011 followed CDRMS <br />approved procedures developed by Cedar Creek to provide unbiased, representative, and cost - effective <br />data for evaluation of revegetation. This protocol is a procedure designed to better account for the <br />heterogeneous expression of multiple seedings within various reclaimed areas while precluding bias in the <br />sample site selection process. By design, the procedure is initiated randomly, and thereafter, samples <br />are identified in a systematic manner, along grid coordinates spaced at fixed intervals, e.g. 270 ft. (see <br />Figure 1). 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 />occurs with simple random sampling. Sample site selection within the reference areas occurred in a <br />similar manner, although grid distribution was visual and dimensions were reduced accordingly to <br />accommodate the smaller polygons. <br />The actual procedure for sample site location occurred as follows. First, a fixed point of reference <br />locatable from year to year was selected. Second, a systematic grid of appropriate dimensions (e.g., 270' <br />X 270' or 95' X 95'.) was selected to provide approximately 50 coordinate intersections within the <br />revegetated area that could then be used for sample sites. (Cover was collected at every 2" point on <br />reclaimed areas or every 3' point on reference areas). Third, a scaled, computer generated <br />representation of the selected grid was overlain on a computer generated map of the area. This grid was <br />then rotated 20 or 30 counter - clockwise from the cardinal compass directions for revegetated areas * . <br />Initial placement of the grid was controlled by the fourth step, selection of a pair of random numbers <br />(between 0 and 270 or 0 and 95 for mine areas 1 and 3, respectively) used to facilitate location of the <br />initial coordinate points from the fixed reference locations. Fifth, using a hand held GPS all sample points <br />were located in the field and sampled. Locations of all revegetation and reference area sampling sites <br />are indicated on Maps 2 through 13. <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 follows that which is indicated on Figure 1. If <br />the boundary of an area was encountered before reaching the full length of a transect, the orientation of <br />the transect was turned 90 in the appropriate direction so the transect could be completed within the <br />* Prior to sampling in 2010, CDRMS expressed concern that revegetation patterns following N -S and E -W <br />orientations (visible from the air) would bias collected data if the systematic grid were laid out along cardinal <br />compass directions. Therefore, Cedar Creek rotated the systematic grid either 20 or 30 in a counter - dockwise <br />direction to avoid any such bias. However, it should be noted that no patterns are visible in the revegetation from <br />ground level; therefore, any potential bias would be negligible at worst. <br />CEDAR CREEK ASSOCIATES, Inc. <br />Page 5 Hamilton Mine - 2011 <br />Phase III Bond Release Evaluation <br />
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