2020-06-08_REVISION - C1982057 (31)

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Table 5. 2018 and 2019 Data and Sample Adequacy Summary for Background and Concentrated Area Woody Plant Density, II-W BRB-5 Phase III Bond Release Area. Woody Density Area Woody Density s N N►„in t and Sampling Year (stems/100m2) Background Density BRB-5 Phase III Bond Release 20.3 28.6 32 152 1.3095 Area 2018 Volunteer Concentrated Area Density 53.5 73.6 75 141 1.293 BRB-5 Phase III Bond Release Area 20181 Background Density BRB-3 Phase III Bond 16.8 24.6 32 164 1.3095 Release Area 2019 Volunteer Concentrated Area Density 32.0 35.9 75 94 1.293 BRB-3 Phase III Bond Release Area 20191 2018 Woody Plant Density Success Evaluation In 2018, the 814.4 stems per acre observed in the Background area exceeds 180 stems per acre (90 percent of the 200 stems per acre mandatory performance standard 1). The average woody plant density data in the Volunteer Concentration area of 2,165.1 stems per acre exceeds 900 stems per acre (90 percent of the 1,000 stems per acre mandatory performance standard 2). Sample adequacy based on woody plant density was not achieved in the"Background" areas of the Phase III BRB-5 in 2018. The mean"Background" woody plant density exceeded 90% of the mandatory performance standard I (Figure D-3, Table C-1)in 2018. Thus, reclamation success under Phase III for woody plant density is demonstrated by passing a one sample t-test of the "reverse null" hypothesis (CDMG 2005 revised rule, 4.15.11 (2)(c)). The BRB-5 "Background"woody plant density data were first evaluated for normality using the Shapiro-Francia test. Based on the raw stems per acre density data; the normality test was not passed in 2018. Consequently, a square root transformation was performed and the normality test was passed in 2018 (Tables 3 and 5 above). Hypothesis testing calculations went forward using square root transformed data for both the"Background" density data and the technical standard. 12