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Mountain Region AGGREGATE 1687 Cole Boulevard Phone:303-985-1070 <br /> INDUSTRIES Suite 300 Fax:303-716-5299 <br /> Golden,CO 80401 www.aggregate-us.com <br /> June 25,2018 <br /> Mr. Amy Eschberger <br /> Environmental Protection Specialist <br /> Division of Reclamation,Mining and Safety <br /> 1313 Sherman Street,Room 215 <br /> Denver, CO 80203 <br /> Re: Notice of Material Imported for Backfill, Permit No. M-1977-141 —Lyons Quarry <br /> Dear Ms. Eschberger: <br /> In accordance with Construction Material Rule 3.1.5(9),the following is provided in support of this Notice: <br /> (a) Inert fill material was/will be obtained,primarily from the Resilient St. Vrain Restoration Project <br /> downstream of the Lyons Quarry. This material is riverbed material excavated to increase the ability of the <br /> floodplain to handle flood events without causing damage to nearby properties. The off-site material is <br /> accepted in accordance with Aggregate Industry's "Inert Material Acceptance Policy" a copy of which is <br /> enclosed. This material will be incorporated into the reclamation of the quarry operated under MLRB I I2c <br /> Permit No. M-1977-141, located at 1605 Old St.Vrain Rd, Lyons, Colorado in Boulder County. RMC <br /> Consultants completed the initial work for Boulder County. <br /> (b) The volume of inert material imported and backfilled as set forth in (a) above was a total 29,405 cubic <br /> yards. This included 27,522 cubic yards of material from Resilient St Vrain Project placed Aug-Oct 2017 <br /> and 1,883 cubic yards of material from access road to quarry placed May 2018. An additional 200,000 cy <br /> may be imported as further reaches of the St Vrain project are completed. <br /> (c) Enclosed is the agreement (Exhibit 2)between Aggregate Industries and Boulder County including an <br /> affidavit certifying that the material imported was clean and inert, as defined in Rule 1.1(20). Additional <br /> affidavits will be submitted as needed. <br /> (d) Importing of fill material started in August 2017 and may continue into 2019. <br /> (e) The imported material was placed in the West Fill Area of the quarry as shown in Exhibit 1.Future fill <br /> material, if any,will be placed in the East Fill Area of the quarry. <br /> (f) The material was placed and stabilized in accordance with the approved reclamation plan. In general <br /> material was dumped, spread out in lifts that did not exceed three feet and run over with tracked vehicle to <br /> eliminate void spaces. Compaction testing was completed by Cesare, Inc. in Centennial, Colorado. <br /> Records available upon request. <br /> If you have any questions regarding this notice please contact me at(719) 239-0974. <br /> Very truly yours, <br /> I Bolduc <br /> Regional Land and Environment Manager <br /> Encl: <br /> Exhibit 1 <br /> Exhibit 2 <br /> Delivering Value A member of the Holcim Group <br />