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6. Is groundwater expected or presently known to exist at the depths of the potash bed (in which the diesel - <br />based mud will be used)? Will there be any ingredient in the mud to help break down the hydrocarbons to <br />mitigate contamination? <br />7. It appears likely that some amount of diesel -based mud will become a permanent residue in the borehole. <br />Please explain how the use of diesel -based mud will not adversely impact groundwater aquifers. <br />8. Reclamation plan: The reclamation plan includes a revegetation plan. The seed mix provided appears <br />adequate for the rangeland in those areas, but the Division must defer to the BLM for the seeding <br />requirements. Please verify whether this seed mix recommendation was provided to you by the BLM, or that <br />you will forward a copy of such to the Division. For now, this seed mix will be used to estimate the bond <br />amount. <br />9. The seed bed preparation should include ripping, chiseling or discing to loosen the compaction prior to <br />topsoil replacement and seeding. After topsoil replacement the seedbed should be firm but not overly re- <br />compacted. If seed are broadcast, the surface should be lightly dragged to incorporate the seed to a shallow <br />depth. <br />10. The Division recommends that all woody brush that was stripped prior to drill pad construction should be <br />scattered on the disturbed area after seeding. <br />These are the deficient items that require more information at this time. The adequacy responses should be clear and <br />complete enough to be technically adequate and to allow estimate of the bond amount, as appropriate. Please provide <br />your responses within 60 days. Once all deficiencies in the NOI have been addressed and the bond amount has been <br />set, you will need to provide a bond on one of the financial warranty forms found on our website. Please go to: <br />www.mining.state.co.us / then click on "Forms, Policies & Guidelines." From that page, click on "Mineral <br />Exploration and Prospecting Forms," and choose a pdf bond form. Make sure you use one that is for "prospecting on <br />BLM land," which will be among the last eight forms listed at the bottom of that page. <br />If you have questions you may reach me at the Division's Durango Field Office: 691 CR 233, Room A -2, Durango, <br />CO 81301; telephone: 970 - 247 -5193. <br />Sincerely, <br />F'd <br />of how much will be used, how much is expected to be recovered (if any), and what type of handling and <br />disposal is required. Will the diesel -based mud include any constituent to help allow better recovery or <br />flushing? <br />Bob Oswald <br />Environmental Protection Specialist <br />Ec: Steve Shuey, DBMS Grand Junction <br />James Blair, BLM Dolores (via electronic copy) <br />(c: \11 -06 docs \Colo Potash NOI adg01 /rco) <br />