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C-1981-008 - SL-12 Adequacy Review No. 4 5 May 2011 Page 8 of 10 terms. However, since TR-58 was not approved until May 13, 2009, and the sampling was conducted in 2007 and 2008, the management activities following TR-58 approval are not relevant to this bond release application. With the approval of TR-58, the following items will be necessary for future bond release applications. a) With the approval of TR-58, WFC committed to apply irrigation water to the reclaimed areas and the reference area at the same time and to release water to both areas at the same time. WFC must provide the dates irrigation water was applied to both the reference area and the reclaimed areas. b) WFC also commits to use 10 shares of water to irrigate the reference area which is applied through the CCC ditch. The approved plan says, "the reclaimed area will receive approximately I share per acre if a side roll is used. If flood irrigation is used, the same application rate as the reference area is used, which is 1.64 shares per acre. " The application rates on both the reference and the reclaimed areas must be documented. c) Plans for Grazing. The approved plan says the "reference areas will be grazed by cows in late June, after any vegetation studies are completed. The livestock will be removed by the end of June, and the reference area will not be further grazed by livestock during the growing season. The reclaimed area will be hayed in late June after any vegetation studies are completed. Winter grazing by cows, deer and elk occur on all areas ". For both the reference area and the reclaimed area, the number and type of grazing animals is needed as well as the specific dates of grazing. d) Plans for Haying. The approved plan says, "The reclaimed area is hayed in late June after any vegetation studies are completed. The reference area is too small to hay, therefore, it is grazed to simulate the haying. The contractor will be instructed to graze the reference area to this same degree. " Future bond release applications must address any haying activities or explain that haying was not conducted. 10. Please provide cover summary tables, to supplement the spreadsheet Tables Al and A2, in the data section of the Vegetation Report (refer to Item 3, above, for detailed explanation of the request). Summary tables were included with the Aug. 2010 response. Item resolved. 11. 2007 IP production success demonstration is presented on pages 11 and 12 of the Phase 3 Vegetation Report. Summary information including statistics is presented in Table 2, page 11. Sample Data is presented in Table A3 (reference area) and Table A4 (reclaimed area). The reclaimed area production sample mean exceeded the reference area sample mean by a wide margin, and because sample adequacy was not demonstrated in the reference area, a 2-sample reverse null t-test was properly selected to demonstrate that the difference was statistically significant (i.e. that the reclaimed area true mean exceeds the reference area true mean). The various formulas associated with the t-test demonstration are presented in their correct and proper form in equations 4, 5, and 6, on pages 8 and 9 of the report. In the calculations however, there were a couple errors, one minor, and one more significant. a) In Table 2, the Table t-statistic used for comparison to the calculated t-statistic is the t value for an alpha error probability of 0.1. This value is more stringent than the alpha error probability level of 0.2 allowed by Rule 4.15.11(2)(c), and specified in Equation 6, on page 9 of the Vegetation Report. This is a minor error, which would work to the disadvantage of the operator. b) The more significant error is that, apparently, a parenthesis was inadvertently omitted from the t-test formula of Equation 6 when it was entered into Excel as a formula. This resulted in an erroneously high value for the calculated t-statistic (3,705.304), as reported in Table 2. The Division independently entered the data and ran the statistical tests for the 2007 IP production data in Excel, with the spreadsheet data . Our results are presented in Attachment 2 to this memorandum. The calculated t- statistic we obtained was 4.7. Since 4.7 is greater than the table t-statistic of 0.847 (for alpha error