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t 4-37.1-180 = 2.056 <br />talc = (2910.55 <br />53 <br />Since critical ttabte = 0.849 (one -tailed, alpha = 0.2, 53-1 df) and t,at, is greater than this critical <br />value, reclamation success for background woody plant density for Phase III in 2012 is <br />demonstrated. Hence the standard that there would be at least 200 woody stems per acre in the <br />background area and has been met for 2012. <br />The 4318.0 stems per acre observed in the combined two planted concentration areas (one of <br />which is fenced and one of which is not) exceeds both 1000 stem per acre standard (P2) for <br />unfenced areas and the 945 stems per acre performance secondary standard for fenced upland <br />shrubs and trees (S 1). It is of note that in the 2012 background sample area, 11.5 percent of the <br />samples had woody plant density over 900 stems per acre (i.e. 90% of the 1000 stems per acre <br />standard). See Table A-3 in Appendix A, Attachment D — Revegetation Success Supporting <br />Documentation. This would suggest that as required, over 10% of the bond release block <br />exceeded the concentration area standard (as was confinned in 2015 sampling, see below). <br />For informational purposes, data from the 2012 concentration area have been separated into <br />those from the fenced area (Supplemental Table A, Attachment E) and those from the planted <br />area that was unfenced (Supplemental Table B, Attachment E). Please refer to Map 1, 2012 <br />Phase III BRB-1 monitoring areas contained in Attachment D — Revegetation Success <br />Supporting Documentation. For the fenced area (Supplemental Table A, Attachment E), the <br />average total woody plant density of 5662 stems per acre far exceeds the required level of 945 <br />stems per acre under Secondary Standard S1. Even though the samples in the fenced area were <br />26, four short of the requisite 30 for a formal test of the "reverse null hypothesis", the lower 90% <br />confidence limit for the mean is 4611 stems per acre, so far in excess of the standard of 945 that <br />there is functionally no doubt as to the validity of the conclusion that the standard was exceeded. <br />In addition, tall shrubs and trees averaged 308 stems per acre but no standard for this component <br />is required under Secondary Standard S 1. The planted but unfenced area (Supplemental Table B, <br />Attachment E) shows that for that portion of the unfenced concentration area where the mean <br />was 3026 stems per acre, the standard of 1000 stems per acre was far exceeded. The lower 90% <br />SL -6 - 20 <br />