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Mr. Patrick Siglin Page 2 <br />April 18, 2012 <br />hydraulic conductivity, total and effective formation porosities, drilling fluid circulation rate and <br />loss, attenuation, dilution, dispersion, and chemical reactions. Also, please provide a map <br />showing the line of cross-section. <br />3. Please provide an evaluation of the potential for the under -reaming process to cause iron sulfides <br />to contaminate groundwater and domestic water supply wells. Please note expected pH values of <br />groundwater in the vicinity of the borehole before and after drilling. Also, please note the <br />expected change in groundwater quality due to oxidation of iron sulfides. <br />4. Please describe expected degradation to groundwater quality, if any, resulting from inter - <br />formational flow of ground water in a wellbore. <br />5. Please either describe the groundwater monitoring plan for the proposed project, or direct us to a <br />description that you have previously provided. <br />6. Please submit additional bond in the amount of $10,551 to cover the sealing the additional <br />borehole volumes (see attached reclamation cost estimate). <br />If you have any questions, please contact me. <br />Sincerely, <br />- ot'vt ICS. <br />Tom Kaldenbach <br />Senior Environmental Protection Specialist <br />cc: Tim Cazier, DRMS (via email) <br />