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4) An estimate for the amount of cubic yards of overburden and topsoil required to be <br />replaced to reclaim the proposed evaporation pond. <br />For the 500 TPY plant expansion, NS is currently looking into technical alternatives such <br />as water treatment options in order to avoid building another pond. If NS decides that it <br />is necessary to construct another evaporation pond, it will be permitted and bonded <br />under a separate technical revision. <br />5) Please provide an estimate of the proposed asphalt thickness of the paved parking <br />lot. <br />a. The proposed asphalt thickness of the paved parking lot will be 4 inches. <br />b. The proposed asphalt thickness of paved areas with heavy haul truck traffic <br />will be 6 inches. <br />The new design layout will decrease previous disturbance estimates submitted to the DRMS <br />on March 25, 2015. Plant expansion will increase the current disturbance associated with <br />existing manufacturing facilities by approximately 7.0 acres. Access roads (15 feet wide) <br />and top soil piles may add an additional disturbance of approximately 2.0 acres. <br />Natural Soda LLC requests a 30 day extension from the original decision date of <br />May 7, 2015 to allow the DRMS to perform their adequacy review and bond <br />calculations. Should you have any questions or comments, please contact me at <br />(970) 254 -1224 or (970) 216 -1010 (c), or Bob Warneke at (970) 355 -4590. <br />Regards, <br />i'�- 0�/ <br />Gerald J. Daub, PG CPG <br />President <br />Daub & Associates, Inc. <br />Cc: Bob Warneke <br />Projects Director <br />Natural Soda LLC <br />Kirk Daehling <br />Plant Manager <br />Natural Soda LLC <br />Timothy Buchanan <br />Enirgi Group Corporation <br />Paul Daggett <br />Bureau of Land Management (WRFO) <br />Travis Marshall <br />Colorado Division of Reclamation, Mining and Safety <br />Grand Junction Office <br />File <br />SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES <br />