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Epvi*roi)n)et)t,C. <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />FOUNDER ARVADA, COLORADO 80003 <br />STEVAN L. O'BRIAN 303- 423 -7297 <br />PRESIDENT FAX 303 - 423 -7599 <br />January 14, 2015 <br />r. Tyler O'Donnell <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Suite 215 <br />Denver, CO 80215 <br />Dear Tyler; <br />RE Albert Frei and Sons, Inc. <br />Worthing Pit -"'M- 1978 -526 <br />Technical Revision 04 - Adequacy Response <br />R E C 77: <br />JAN 21 2015 <br />DIVISION OF RECLAMATION <br />MININGAND SAFETY <br />On behalf of my client Albert Frei and Sons, Inc., I am responding to your adequacy <br />review letter dated January 7, 2015. I have included your review points that need to be <br />addressed in the order presented so the questions and answers will be in the same <br />document for easy reference. <br />1) DRMS would prefer to have a reclamation seed mix using native species /non- aggressive <br />species. DRMS would request that the applicant remove Crested Wheatgrass from the <br />proposed reclamation seed mix due to its aggressive nature. DRMS would propose that the <br />Applicant /Operator consider using Western Wheatgrass in the place of Crested <br />Wheatgrass. <br />We agree with the substitution of the Western Wheatgrass for the Crested Wheatgrass. <br />Attached is the revised seed mix with that change made. <br />2) Comment: In review of groundwater monitoring data from the Stagecoach Pit (DRMS File <br />No. M- 1983 -067) and information from the surrounding area, DRMS believes that <br />pre- mining groundwater elevation ranged from 5,003 to 5,004 feet above mean sea level. <br />We agree. If that is the case, then when construction of the return flow ditch is finished <br />and the system has equalized, the ground water elevation as it enters the site will be at or <br />below the historic elevation. <br />