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diversity, or woody plant density). For monitoring efforts, comparisons shall be made <br />directly with either the reference area parameters or the permitted standards to facilitate a <br />determination of the progress of revegetation. In the case of ground cover and <br />production, comparisons shall be made against reference area data of the same year. <br />Diversity and woody plant density variables shall be compared against the standards <br />defined above. <br />For bond release efforts, direct comparisons are made when the revegetated area <br />mean value for a given variable is greater than either 90% of the standard or the reference <br />area mean assuming that a statistically adequate sample has been collected. If a <br />statistically adequate sample cannot be obtained, a "reverse-null" hypothesis test may be <br />employed as detailed in C.R.S. Rule 4.15.11 (2) (c). If an adequate sample is obtained <br />for a particular variable, but the mean is less than 90% of the reference area mean or <br />standard, a "standard-null" hypothesis t-test may be employed as detailed in C.R.S. Rule <br />4.15.11 (2) (b). <br />For the typically problematic variable of woody plant density, Colorado has <br />implemented three alternate adequacy / success evaluation methods under C.R.S. Rule <br />4.15.11 (3) that may be utilized in lieu of those detailed under 4.15.11 (2). Until <br />experience dictates which procedure is best (because these are relatively new metrics to <br />the science), it would be prudent to collect a minimum of 75 belt transects (at least 100 <br />m2 in size) as indicated in 4.15.11 (3)(b)(i). These data can then be used for the various <br />analyses / comparisons. <br />4.15-35 Revision Date: 12/22/09 <br />Revision No.: TR-84