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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />June 18, 2012 <br />Ms. Connie N. Davis <br />Aggregate Industries - WCR, Inc. <br />1707 Cole Blvd., Ste. 100 <br />Golden, CO 80401 <br />Re: 83rd Joint Venture, Permit No. M- 1992 -069, Revision No. TR -08 <br />Technical Revision Approval and Financial Warranty Calculation <br />Dear Ms. Davis: <br />STATE OF COLORADO <br />Technical Revision to allow the Division to recalculate the financial warranty required to <br />backfill the 83 Joint Venture site to prevent the exposure of groundwater. <br />Based on the financial warranty estimate calculated by the Division on June 15, 2012 (see <br />attachment) the financial warranty amounts and due dates would be as follows: <br />COLORADO <br />D I V I S I O N O F <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />John Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta Pifieda <br />Director <br />On June 15, 2012 the Division of Reclamation, Mining and Safety (Division /DRMS) approved the <br />Technical Revision application submitted to the Division on May 23, 2012, addressing the <br />following: <br />The terms of the Technical Revision No. 8 approved by the Division are hereby incorporated into <br />Permit No. M- 1992 -069. All other conditions and requirements of Permit No. M- 1992 -069 remain <br />in full force and effect. <br />The estimated liability amount of $7,828,000.00 exceeds the $71,404.00 financial warranty <br />currently held. Please submit additional bond in the amount of $7,756,596.00. The revision will <br />not be final until the bond is approved by the Division. <br />The Division's exposed ground water letter dated April 30, 2010 stated increased financial <br />warranties may be posted in a phased manner not to exceed three (3) years. The Division <br />proposes a one -third per year financial warranty submittal schedule. The Permittee will be <br />required to submit thirty -three percent (33 %) of the financial warranty amount within 60 days, <br />sixty -six percent (66 %) by the end of the second year and the full warranty (100 %) by the end of <br />the third year from the date of this letter. <br />Office of Office of <br />Mined Land Reclamation <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />