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REV91864
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REV91864
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Entry Properties
Last modified
8/25/2016 3:13:22 AM
Creation date
11/21/2007 11:15:49 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981071
IBM Index Class Name
Revision
Doc Date
6/18/1991
Doc Name
MR 91-68 MODIFICATION OF PASTURELAND PRODUCTION SAMPLING COLO YAMPA COAL CO PN C-81-071
From
CYPRUS YAMPA VALLEY COAL CORP
To
MLRD
Type & Sequence
MR68
Media Type
D
Archive
No
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z =mean of trarLSec.-t means <br />n =number of transacts <br />• p = Sampling precision expressed as an acceptable percent error;l0~ = 0.1 <br />x = Average value of all trartsect means. <br />Far reclaimed pasturelard, Dover aryl production will be oo~ared to cover and <br />production on the pastureland reference area. <br />For rangeland a weighted average will be generated far Dover and productivity for <br />all the reclaimed sites in the affected area aryl far all the oorrespording <br />reference areas. Hoch a weighted average and a pooled variance will be cargnnted <br />using the following formulas (Wyoming Department of Errvi_rornnental Quality, Lard <br />Quality Division, Guideline No. 2, March 1979 Revision): <br />X = ~N X <br />a a <br />N <br />S Z = N a S= <br />• a a <br />N na <br />Where: <br />X = Percent cover ar productivity for entire area (Y = symbol for <br />reference areas); <br />xa = peroasit Dover ar productivity in range site; <br />Na = acreage of range site a; <br />N = acreage of entire affected area; <br />SZ = variance far entire affected area; <br />s <br />a = variance in range site a ar in reference area; <br />na = number of samples taken in range site a ar reference area a; <br />Separate values will be calculated for both the reclaimed area aryl the reference <br />areas. 'These values will be utilized in calculating a reclamation suocesss <br />Starrlarr3, <br />• <br />MR 91-68 780-137 (b) Revised 06/11/91 <br />
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