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May 31, 2012 <br />Dustin Zapla <br />Division of Reclamation & Mining Safety <br />101 South 3 Street, Suite 301 <br />Grand Junction, CO 81501 <br />Gentlemen, <br />Sincerely, <br />Bob D. Baker, P.E. <br />CO Reg. No. 10755 <br />Bob D. Baker, P.E <br />353 Bonderud Ave. Craig, CO 81625 <br />PE #10755 <br />Subject: Northwest Aggregates Inc. <br />Wand Pit — File No. M -2010 -007 <br />Subsequent to an on -site inspection of the subject project and a review of the mine plans, <br />the following recommendations are suggested regarding mining within 200 feet of the <br />railroad lying adjacent to the mine area. <br />1. No excavation will be done in an area within 40 feet of the toe of the <br />embankment of the railroad. <br />2. The slopes of the pit excavation will be maintained no steeper than three <br />horizontal to one vertical (3:1). <br />If these recommendations are followed, it will result in conditions which will have no <br />adverse effect on the safe operation of the railroad adjacent to the mined area. <br />