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Nwi,s? 5, W3`Z. <br />DAUB & ASSOCIATES, INC. <br />.r August 20, 2010 <br /> <br />1985'/2 SOUTH BROADWAY <br />GRAND JUNCTION, CO 81507-9649 <br />(970) 254-1224 <br />FAX (970) 242-8438 <br />email: gjdaub@daubandassociates.com <br />www.daubandassociates.com <br />Mr. Travis Marshall <br />Grand Junction Field Office ?u? ? Q. ?jn o? <br />Colorado Division of Reclamation, Mi n afet <br />101 South 3rd, Suite 301 Division ur Keclama <br />Grand Junction, CO 81501 Mining and Safety <br />RECEIVED <br />AUG 0 2010 / <br />GRAND JUNCTION FIELD OFFICE <br />DIVISION OF <br />RECLAMAMN MINING & SAFETY <br />Re: Natural Soda, Inc. Permit No. M-1983-194" chnical Revision No. 30, <br />response to preliminary adequacy review. <br />Dear Mr. Marshall: <br />Thank you for reviewing Technical Revision No. 30 submitted by Natural Soda, Inc. <br />(NSI). This response addresses the issues and requested clarifications which were <br />listed in your August 12, 2010 letter. <br />1) The wells, MMC-IRI-5, 8, 4, 6, and 7 will serve as point of compliance wells. These <br />wells monitor the Perched (IRI-5 & 8), A-groove (IRI-4), B-Groove (IRI-6), and <br />Dissolution Surface (DS) (IRI-7) aquifers. Please see the attached map. <br />2) The statement referenced is in support of Table 1 of the Comprehensive Monitoring <br />Plan July 2010. The 'major' constituents are included in a three bottle sample set, <br />while the five bottle sample set includes both `major' and 'minor' constituent sets. <br />Thus, when the well is scheduled for 'minor', a five bottle set is taken and all of the <br />constituents are analyzed. These constituents were established by the BLM in the <br />ROD. Inclusion of the wording 'major' and 'minor' in a cell (e.g. 90-1 has minor and <br />major scheduled annually) is redundant, since analyzing for minor constituents will <br />include the major constituents, but is stated to illustrate compliance. <br />3) Any spills within the processing building drain to a containment sump and would <br />normally be pumped to the Barren Liquor Tank for reinjection into the operating <br />wells. This containment sump has a 6-inch overflow pipe that drains to the 3 acre <br />Process Pond. Tanks, external to the plant, are surrounded by a concrete <br />containment with a capacity of 90,000 gallons. This containment also drains through <br />a 6-inch drain to the 3 acre Process Pond. The two Cooling Towers are within a <br />concrete containment of 10,500 gallons. This containment drains to the 7 acre <br />Evaporation Pond. Surface drainage at the plant site is channeled and directed <br />toward the 7 acre Evaporation Pond. The 7 and 3 acre ponds are located northeast <br />SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES