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LAFARGE <br />NORTH AMERICA !/ <br />AGGREGATES, CONCRETE <br />& ASPHALT <br />March ] ], 2005 <br />Mr. Gregg R Squire <br />Division of Minerals and Geology <br />~~ 4.- <br />JUL 13 2005 <br />Dinkion of htirarals & Gcolagy <br />1313 Sherman St, Room 215 <br />Denver, CO 80203 <br />RE: Lafarge West, Inc., Permit No. M-2000-016 <br />Riverbend Operation; Adequacy Review Response to Requested Amendment <br />Dear Mr. Squire, <br />Listed below are Lafarge's responses to the Division's adequacy review comments on the Riverbend <br />Operation 1 12c Permit Amendment OI Application, Permit Number M-2000-0] 6. <br />1. Exhibit C -Pre-Mining and Mining Plan Maps <br />a) Since this application is an amendment !o an existing permit, M-2000-016, the <br />Riverbend Operation, and will incorporate a second active pit, M-1985-088, the Fort <br />Lupton Pit, into the amended area, the Division is requesting that the applicant <br />provide a map showing the boundaries of the two currently permitted sites and their <br />correlation with the areas to be incorporated into the Riverbend permit through the <br />amendment process. <br />The existing boundaries for permit M-1985-088 and M-2000-016 have been added to <br />Exhibit Cl Pre-Mine Map. The existing permit areas have been shaded in gray, please <br />see attached Exhibit Cl Pre-Mine Map. <br />b) The legend on Exhibit C3 Mine Plan Map indicates that the purple dashed line with <br />twa dots between each dash represents lateral ditches. In the northeast corner of <br />Phase 3 on this map there are purple dashed lines with only one dot between each <br />dash. What does this symbol represent? <br />The feature in the northeast corner of Phase 3 incorrectly identified with only one dot <br />between each dash is a lateral ditch. Exhibit C3 has been corrected; the lateral ditch is <br />represented by the appropriate line type. <br />c) An examination of the Mine Plan Maps show several locations, especially within <br />Phases 4 and 6, where the topsoil/overburden stockpiles are located within ZO or 30 <br />feet of the South Platte River channel and along the outside edge of a river bend. <br />How will these stockpiles be protected from undercutting at the toe of the stockpiles <br />during high flows, and how will the river be protected in the even that the stockpiles <br />may erode or slump in to the channel?_ <br />LAFARGE NORTH AMERICA INC. -Aggregates, Concrete & Asphalt <br />10170 Church Ranch Way Suite 200, Westminster. Colorado 80021 <br />Telephone: (303) 657-4000 Facsimile: (303) 657-4037 <br />