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Revised 1/4/80 <br />• <br />Section 816.116 (a) Continued. <br />P = Sampling precision expressed as an acceptable percent <br />error; 10% = 0.1, 20% = 0.2; <br />z average value of all transect means. <br />After field sampling has been completed, a weighted average will be <br />generated for cover and productivity for all the range sites in the <br />affected area and for all the reference areas. Both a weighted <br />average and a pooled variance will be computed using the follocring <br />formulas (Wyoming Department of Environmental Quality, Land Quality <br />Division, Guideline No. 2, March 1979 Revision): <br />2 <br />2 <br />Nh za S2 Na Sa <br />X f - <br />N N na <br />Where: X = percent cover or productivity for entire area <br />(Y = symbol for reference areas); <br />• a = percent cover or productivity in range site; <br />N = acreage of range site a; <br />a <br />N = acreage of entire affected area; <br />52 = variance for entire affected area; <br />52 = variance in range site a or in reference area a; <br />a <br />n = number of samples taken in range site a or reference <br />a <br />area a. <br />Separate values will be calculated for both the affected area and <br />the reference areas in the premine study and the reclaimed area <br />and the reference areas in the postmining study. These values will <br />be utilized in calculating a reclamation success standard. 'the <br />reclamation success standard for cover and production will be <br />• determi~~ed using the equation: <br />816-157 (c) <br />