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<br />HYDROKINETICS INC. <br />12975 W. 24th Pl. <br />Golden, (Applewood) Colorado 80401 <br />(303) 237-8865 <br />Scott G. Mefford, President <br />Certified Professional Geologist <br />Apri] 22, 1999 <br />Ms. Lori Potter <br />Kelly, Haglund, Garnsey & Kahn <br />1441 18's Street, Suite 300 <br />Denver, Colorado 80202-1255 <br />RE: Review of Battle Mountain Document "TR-26, Water Management in the West Pit <br />Area" <br />Dear Lori: <br />Pursuant to our discussions on Monday, we have prepazed this set of comments on the <br />TR-26 document. These comments focus on the groundwater issues discussed in section 3 and 6 <br />of [he main body of the TR-26 document, and on [he document titled "West Pit Hydrogeologic <br />Characterization Field Program" found in Appendix A. We understand these comments will be <br />reviewed by the District and incorporated into their comprehensive response as appropriate. <br />Comments and Questions on H d}_roloQV Section of TR-26 Document <br />Page 14 .. There are a number of references on this page to Figure 3-4, the water level contour <br />map, and to various wells. There are no well numbers on Figure 3-4, making it difficult to <br />follow the text. It is difficult to determine which wells were used in the preparation of figure 3-4, <br />and which were not. Well numbers are identified on Figure 3-1, titled West Pi[ Monitor System. <br />Adjusting these two maps for the scale differences did not allow us to properly overlay the maps <br />and identify wells. One of the scales appears to be incorrect, probably that on Figure 3-4. It's <br />uncleaz if this scale error has impacted any of the data placement, gradient calculatiions, or <br />conclusions reached using [his map. <br />Page 15 .. What is the basis of the assumption for porosity of the backfill to be 30%. <br />Page 19 .. Paragraph 3.1.4 .. The conclusion is reached that the system is in steady state and that <br />the hydrologic flows that currently exist will probably represent flows in the system over the <br />