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~~ ~ III IIIIIIIIIIIII III STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1317 Sherman St.. Room 215 Denver, Colorado 80203 Phone: (7031 866-1567 FA%:13031 87 2-8106 July 26, 1995 Mr. Matthew S. Hayes Hayes Environmental Services 300 Lafayette Street Denver, Colorado 80218 RE: 1995 Baseline Sampling Methods for Bowie Mine No. 2 Dear Mr. Hayes: ~~~ DEPARTMEN-I' OF NATURAL RESOU2CES Roy Romer covcrnor ~a mes S Lochhead ExttuOVe DireClOr Michael B. Lang Drvivon Uirccror The Division has reviewed your proposed methodology for conducting baseline sampling at the Bowie Mine No. 2 located near the town of Bowie, Colorado. Overall, the proposal is acceptable with the execption of three areas that will require some clarification. Below the major topics are listed with any comments. Expected Number of Communities The two major communities (juniper woodland and mixed shrubland) which will be matched to reference areas are acceptable as proposed. Initially, you were going to qualitatively sample the upper meadow community as it was not large enough to be considered a major community and quantitatively sample the lower meadow community as a major community. However, after you initiated the sampling, the upper and lower meadows were determined to be similar enough that they could be lumped into one disturbed meadow community as we discussed in the field. Since there are no similar areas nearby that could be utilized as a reference area, the proposal to develop technical based success standards for this area is acceptable. Proposed Methods Minimum Sample Numbers- After reviewing the Land Use Guidelines and the Bond Release Guidelines, both documents suggest that a minimum of 15 to 20 samples be taken for baseline and bond release areas and l0 for reference areas even if sample adequacy is reached prior to this. You have proposed a maximum of to samples per community per parameter. This should be adjusted upward for the proposed communities.