Laserfiche WebLink
IME (Kent Crofts, principal) of Yampa, Colorado was contracted to conduct vegetation sampling <br />under the direct supervision of Trapper Environmental Manager Forrest Luke and is the author of the <br />Attachment 1 reports. Sampling was conducted as approved in Trapper's permit application C-81- <br />010 to ensure that applicable approved post-mining land uses were achieved. <br />2.1. Vegetation Samplinq Summary <br />Table 2.1-1 gives a summary of the vegetation data totals presented in Attachment 1 and compares <br />these totals against bond release success standards outlined in the Trapper permit document. Table <br />2.1-1 data conclusively demonstrate that all vegetation standards were met for all parameters of <br />interest for rangeland post-mining land uses during both 2007 and 2008 sampling years. <br />2.2. Sample Adeguacy <br />Table 2 in Attachment 1 (Crofts' Report) provides a summary of sample adequacy values calculated <br />for all of the vegetation parameters sampled for rangeland with this SL-10 application. <br />Results of the application of the reverse null hypothesis T-Test on mean to demonstrate revegetation <br />success for production and shrub density values are given in Table 2.2-1. Note that for all of the plant <br />production and shrub density sample parameters in question, the calculated T value exceeded the <br />table T value. Thus, in all cases the null hypothesis was rejected and revegetation parameters were <br />deemed successful. <br />A rangeland plant cover value was determined in the subject bond release block using simple random <br />sampling. For this parameter the sample adequacy equation used in Table 2 of Attachment 1 was <br />valid and sample adequacy was achieved. Since in all cases the sampled values exceeded the bond <br />release standards and since an adequate sample was demonstrated, there was no need to subject <br />these parameters to a reverse null evaluation. <br />3.0 Achievement of the Post-Mining Land Use <br />Trapper Mining Inc. has achieved the approved post-mining land uses of rangeland. <br />3.1. Rangelands. <br />The post-mining land uses of rangeland and wildlife habitat have unquestionably been achieved. As <br />documented in Section 2.0 of this report, an erosionally stable and biologically diverse cover of plant <br />2