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<br />~ra~ er ~ilinin Inc. IIIIIIIIIIIIIIIIIII <br />pp 9 <br />Box 187 <br />Craig, Colorado 81626 <br />(303) 824-4401 ~~ <br />May 23, 1983 <br />i~AY w 5 i~83 <br />Mr. Mike Savage r~l~tD i.nrn, F+. it p~n~flDN <br />Colorado Mined Land Reclamation Division C010. Depi. Ot (\~lurai R2SOUiCe~ <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Dear Atike: <br />As you may recall, during your last inspection visit at Trapper on April 11th, <br />we discussed the need to obtain the Division's approval for the criteria to <br />determine revegetation success in accordance with stipulation number 1 of <br />Trapper's approved permit (C-010-81). At that time, I gave you copies of cor- <br />respondence with Dr. E. F. Redente of Colorado State University re the method- <br />ology currently proposed in Trapper's permit application (attached). I also <br />provided you a copy of a paper I presented at the Reclamation of Lands In the <br />Southwest Symposium in Albuquerque on October 22, 1982 (attached). The paper is <br />currently being published as a part of the proceedings of that symposium. <br />Actual 1980 - 1982 herbaceous plant production data from Trapper, are analyzed <br />in the paper for the validity of using a reference area concept (page 2-4) or <br />the procedure proposed in Trapper's permit application (correlation area <br />concept) (pages 10-11) to establish a revegetation success standard. <br />At this time, we are willing to commit to judge success by either the procedure <br />described in Trapper's permit application (sections 4.4.1.1 and 4.4.1.2) or by <br />the following alternative method, whichever the Division may elect to approve. <br />The proposed alternative is to use the reference area concept and hypothesis <br />testing at a 90Y• statistical confidence level. Since cover data are binomial, a <br />different formula is required for cover than for production. Cover data would <br />therefore be evaluated as follows: <br />Ho: pm > .9 Pr <br />Ha: pm < •9 Pr <br />where pr = the average herbaceous plant cover on the reference <br />areas expressed in decimal form (e. g. .5 which equals <br />50% cover) <br />pm = the average herbaceous plant cover on the revegetated <br />area expressed in decimal form <br />