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CERTIFIED MAIL RECEIPT 7014 2870 0000 8513 <br />RETURN RECEIPT NO. 9590 9403 0111 5077 4306 15 <br />August 28, 2015 <br />Mr. Tyler O'Donnell <br />Division of Reclamation Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Permit Number M-1977-436 — Brighton Mine <br />Surety Reduction Request <br />Dear Tyler: <br />RECEIVED <br />AUG 31 2015 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />I;6L <br />AGGREGATE <br />INDUSTRIES <br />The Division concluded in its report of the June 2, 2015 monitoring inspection that Aggregate <br />Industries (AI) could request a surety reduction for reclamation of the Brighton Mine. Enclosed <br />is the completed form request for the reduction. <br />The current financial warranty held by the Division is $1,579,215. As the slurry walls have been <br />completed and approved by the Division of Water Resources, and much of the site has been <br />graded and seeded, Aggregate Industries requests a reduction of the financial warranty for <br />remaining grading, seeding and site maintenance to $150,000. It is estimated that there is <br />approximately 70 acres of the site require some degree of grading and/or seeding and post- <br />revegetation site maintenance. Al has estimated a maximum of $2,000 per acre for those <br />activities, or $140,000. Additionally, Al estimates approximately one more year of weed control <br />in previously reclaimed areas at a cost of $10,000. <br />City of Thornton is the owner of the <br />information is included on the request <br />additional Thornton representatives as <br />referenced e-mail addresses. <br />Thank you for your consideration. <br />Very <br />truly yours, <br />Connie N. Davis <br />Land Advisor <br />Enclosure <br />reservoir portions of the site. Their official contact <br />form. Copies of this request are being provided to <br />listed below and they may also be contacted at their <br />cc: Emily Hunt, City of Thornton (Emily.hunt@cityofthornton.net) <br />Eduardo Moreno, City of Thornton(Eduardo.moreno@cityofthomton.net) <br />Aggregate Industries <br />West Central Region, Inc. <br />1687 Cole Boulevard, Suite 300 <br />Golden, CO 80401 <br />Telephone: 303-985-1070 An Equal Opportunity Employer <br />