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Helen Migchelbrink, PE <br />1505 Teakwood Court <br />Fort Collins, CO 80525 <br />April 10, 2008 <br />Mr. Carl Mount <br />Colorado Division of Reclamation Mining and Safety <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />~~~oi1. <br />~~~~~~~® <br />APR 15 2000 <br />Division °iand Sa ety n, <br />Mining <br />Re: Technical Revision for Permit No. M-2006-018 -North Bank Resources <br />Dear Mr. Mount: <br />On behalf of Lafarge, this letter shall serve as formal request for a Technical Revision to <br />the Reclamation Permit No. M-2006-018 for the North Bank Gravel Mine in Garfield <br />County. Enclosed please find the TR permit fee of $216 and proposed mining phasing <br />plan. <br />The purpose of this Technical Revision is to alter the mining sequence and phasing plan <br />as it was originally described in the application materials. Originally, the mining <br />sequence was intended to be done in fifteen to twenty acre internal phases, starting with <br />Cell A and finishing with Cell B, and was written as shown below: <br />Exhibit D-Mining Plan (from the DRMS application dated January 20, 2005) <br />Material will be processed from two distinct pits; Cell A and Cell B. Cell A occupies <br />approximately 47 acres and Cell B 31 acres, respectively. The proposed operation will <br />start with the western Cell A, and completely mine it out prior to mining of Cell B: <br />Each of the cells will be stripped in internal phases of approximately 15 to 20 acres <br />each in order to allow for efficient removal of the resources, minimal "double- <br />handling"and stockpiling of overburden, and concurrent reclamation. <br />Proposed phasin sequence change <br />Lafarge is requesting the following change to the sequence (mine Cell B first and then <br />Cell A last) and to the sub-phasing (rather than 15 to 20 acre sub phases, complete the <br />operation in sub phases of approximately 10 acres each) <br />Material will be processed from two distinct pits; Cell A and Cell B. Cell A occupies <br />approximately 47 acres and Cell B 31 acres, respectively. Construction will start with <br />the western portion of Cell B. Then the mining of Cell B, which will occupy 31 acres, <br />L_ <br />