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i ~ - I <br />iii riiriiiuriiiii <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 51., Room ? I S <br />Denver, Colorado A0203 <br />Phone: 130}1 A66-3567 <br />FA%: 1103)A3?-A106 <br />DATE: June 10, 1996 <br />TO: Joe Dudash <br />FROM: Larry Routten/~L <br />RE: HG Vegetation Sampling <br />~I~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governur <br />lames S Lochhead <br />Eaecwrve Director <br />Michael A. Long <br />Division Director <br />I reviewed the vegetation sampling outline for the HG Mine submitted by TerraMatrix. <br />My review was done with the intent of ensuring that the field studies are done in such a <br />manner that the goals of the Division's bond release guidelines are met. In genera, <br />TerraMatrix.s proposed study meets those goals. However, the proposal is lacking in some <br />details. The guideline should be consulted in conjunction with my comments, if there are <br />any questions. <br />I was not able to determine if topsoil replacement practices (specifically, replacement <br />thickness) was the same over the entire site. If not, TerraMatrix should consider treating <br />areas with different topsoil replacement thicknesses as separate sampling areas. I also did <br />not find any information specifying which seed mix or mixes were used. I presume the seed <br />mix was the same or very similar over the entire site. It would be helpful to locate these <br />two pieces of information prior to field studies. Iran out of time to search because I need <br />to be out of the office next week. <br />The following comments and questions are items TerraMatrix might want to consider and/or <br />discuss with the Division prior to beginning their field work. <br />1. TerraMatrix's proposal to sample the entire mine site is probably adequate; however, <br />they did not give any details about how they intend to stratify their samples in the <br />areas reclaimed during nine different years. I would suggest the proportional <br />allocation or acreage-weighted sampling methods discussed in the bond release <br />guideline. <br />2. TerraMatrix might consider gathering some representative data from small, <br />noncontiguous areas such as topsoil pile C and the explosives storage area, even if <br />randomly placed transects do not fall in those areas. They would at least have some <br />documentation of the success of reclamation in those areas. If data is not collected, <br />a thorough discussion of qualitative observations should be included in the study, at <br />a minimum. <br />~,u../,~.. - /ca/NGr <br />