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Mr. Jim Stark <br />September 23, 2005 <br />Page 6 of 6 <br />2) Many of these valley fill deposits contain significant fractions of colluvium and sheetwash <br />deposits originating from steep slopes paralleling the valley bottoms (canyon walls); <br />3) Based on well monitoring reports and infra-red imagery collected in 2005, sub-irrigation within <br />these valley bottoms is very limited; <br />4) Active erosion naturally occurring in the channels of both Jubb Creek, Collom Gulch, and Little <br />Collom Gulch is affecting the surface and groundwater hydrology of the valley bottoms, resulting <br />in less frequent flooding and lower water tables, and would also hinder tillage efforts. These <br />conditions effectively reduce the ability of these drainage bottoms to support agricultural use <br />other than grazing; <br />5) Local and regional agricultural economics are prohibitive to developing the infrastructure <br />(ditches, diversions, dikes, etc.) required to manage these drainage bottoms as irrigated fields, and <br />observed trends over the last 30 years indicate a local decline in such practices, particularly on <br />such a small scale as would apply to this study area. <br />Based on these preliminary findings, Maxim offers the conclusion that no valley bottoms within the area <br />to be affected by mining meet the AVF criteria de5ned in Section 2.06.8. Final conclusions will be <br />presented following our review of the data remaining to be collected. We look forward to discussing this <br />review and the available data with you during our on-site meeting and review October 4, 2005. We hope <br />that you or another appropriate member of your staff would be available for a site tour on October 5, 2005 <br />to discuss these findings and review these valley bottoms first-hand. <br />If you have any questions, regarding this transmittal, please feel free to contact me at (970) 304-0140 or <br />(307)259-7824. <br />Respectfully Submitted, <br />Maxim Technologies <br />A D1VIS[ON OF TETRA TECH, INC. <br />Keith Thompson <br />Project Manger <br />JS/CC/KT <br />Enclosure <br />"Scientists and Engineers CommBted to Client Satis/action" <br />