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~~LAFARGE <br />NORTH AMERICA <br />AGGREGATES, CONCRETE <br />& ASPHALT <br />6mk, n6~ <br />RECE~V~.C~ <br />vppR12 ~ <br />Mazch 31, 2006 <br />ion of Mina~ab ahd GaolopY <br />Division of Minerals and Geology - <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Bluestone Pit, Permit No. M-1991 035 <br />~ Request for Placement of Inert Fill in an Active Construction Materials Pit <br />To Whom it May Concern: <br />Lafarge is requesting permission from the Division of Minerals and Geology to allow the importation and <br />placement of inert fill into our Bluestone Pit located near Boulder, Colorado. In support of this, Lafarge <br />is pleased to provide the following information concerning Rule 3.1.5(9) on the importation and <br />placement of backfill. <br />a) The attached map details the location of the proposed fill. The fill will be incorporated into <br />reclaimed slopes and silt ponds and covered with native material or topsoil. <br />b) The attached affidavit certifies that the material meets the definition of "clean and inert" fill. <br />Based on this affidavit, Lafarge believes that the groundwater will not be impacted by the placement <br />of this material. <br />c) It is anticipated that the material will start to be incorporated into the reclamation process in 2006 <br />and will continue each year over the life of the mine. <br />d) The placement of the inert fill will not alter the planned reclamation of the Bluestone Pit. Since it <br />will be placed within the slopes and silt pond areas and covered by native material, no changes aze <br />anticipated to the post-mining use. <br />e) Since the material to be placed is overburden, topsoil, milled asphalt rubble and clean concrete <br />rubble, the particle sizes will be sufficiently small as to not result in large or unstable voids. The <br />material will "mimic" the placement of the natural gravels and overburden and therefore not pose <br />any stability risk. <br />Should you have any questions, please do not hesitate to contact me at 303-657-4466. <br />Sincerely, <br />Tamra Stevens, ASP <br />Resource Management Coordinator <br />Attachments: Map detailing fill location <br />Affidavit on Fill Material <br />