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III IIIIIIIIIIIII III <br />999 <br />C c~RUs <br />~ Yampa Valley <br />June 30, 1992 <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879800 <br />~{ M <br /> <br />Dan Matthews <br />Reclamation Specialist <br />Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />iv,iua~ t_anry <br />Reclamation nr,,;si,Jn <br />Dear Mr. Matthews; <br />Re: Woody Plant Density Data. Block C 1991: Permit C-81-071. Mines 1. 2, and <br />Eckman Park <br />Per our discussion of June 12, CYCC has enclosed the transact location sheet, final transact <br />density summaries, and disk with total transact density values in a Lotus format for your use in <br />the statistics application evaluation. Please note that the decimal mean values correspond to the <br />number of woody plants per meter squared, and that the data summaries only address the 2x50 <br />meter belt transacts. As discussed, 4x50 meter transacts were also evaluated for statistical <br />impacts, as were longer transacts. However, neither of these modifications yielded any <br />significant gain, and were subsequently discontinued due to their additional manpower <br />requirements. As you can see, the extreme variability both within and between parcels <br />contributed to the high sample adequacey values obtained. Please note that this group of parcels <br />was treated as a single parcel for the purposes of sampling and bond release calculation. <br />I hope that this data will aid you in your evaluation of the sample adequacey equations, and we <br />look forward to receiving an update on your thoughts concerning the new package. <br />Should you have any questions or comments, please contact me at your convenience. <br />Sincerely, <br />C~.O.~ ~ ~ <br />Marcus A: Middleton <br />Environmental Specialist <br />MAM: m m:pe: dg <br />