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TETRA TECH <br />Page 2 of 8 <br />Mr. Peter Hays <br />April 29, 2011 <br />6. The Division received comments from the Colorado Division of Water Resources, Colorado Historical <br />Society, the Corps of Engineers and Noble Energy. The letters are attached for review. Please <br />address the comments noted in the letters and make any changes to the application as necessary. <br />Attached please find response letters to the Colorado Division of Water Resources, Colorado <br />Historical Society, and the Corps of Engineers (see Attachment 3). As you know, Noble withdrew <br />their objection to the project because Lafarge and Noble signed a Surface Use Agreement. <br />Therefore, no response to Noble's letter was needed. <br />6.4.3 Exhibit C - Pre-Mining and Mining Plan Maps of Affected Land <br />7. Please depict the proposed mining offsets to permanent man-made structures and the Cache la <br />Poudre River on the Mining Plan Map. <br />We have created a new sheet (Sheet 4) as part of Exhibit C to be able to clearly and legibly show <br />dimensions for the mining offsets to permanent man-made structures. Attached please find a <br />complete, updated version of Exhibit C (Attachment 1). <br />6.4.4 Exhibit D - Mining Plan <br />8. The Applicant states mining will begin in the southeast corner of the mining cell and continue to the <br />center cell, north cell and conclude in the southwest corner of the cell. Please clarify if the Applicant <br />is proposing a phased mining plan or a conceptual mining plan. <br />The applicant is proposing to mine the Iverson Mine in one phase. <br />9. If a phase mining approach is planned, please provide the following information and depict the mining <br />phases on Exhibit C - Mining Plan Map. <br />a. the size of area(s) to be worked at any one time <br />b. a description of the size and location of each area to be worked during each phase <br />c. an estimate of the periods of time which will be required for the various stages or phases of the <br />operation <br />As indicated in response to comment 8, the property will be mined as one phase. The acreage of this <br />single phase is 45.1 acres. A detailed description of how this single phase will be mined is provided <br />in the "Methods of Mining" section of Exhibit D (on pages D1 and D2). The amount of time it will take <br />to mine the site is dependent on market conditions; however, Lafarge anticipates that it will take four <br />to five years to mine the site. As Lafarge mines the site, they will reclaim the property as described in <br />Exhibit D. <br />10. Please commit to providing the Division with an approved NPDES discharge permit from the <br />Colorado Department of Public Health and Environment. <br />Attached is a copy of the approved NPDES permit (Attachment 4). <br />11. Please commit to providing the Division with a copy of the Drainage Report prepared for Weld <br />County. <br />We will provide a copy of the Drainage Report to the DRMS once it is accepted by Weld County. <br />12. The Applicant states stockpiles will be broadcast seeded and incorporated into the weed control <br />program. Please provide the Division with a copy of the weed control plan for the Iverson Mine. The <br />weed control plan must include the following requirements and be prepared in consultation with the <br />appropriate local weed control authority; a list of potential noxious weed species (target species), the <br />control methods and treatment window for each species, monitoring plan and follow-up plan. <br />Attached is a Weed Management Plan for the Iverson Mine (Attachment 5). <br />13. The Applicant states Lafarge is working with the Corps of Engineers regarding the regulatory <br />requirements related to the created wetland area on the east edge of the mining cell. Please commit <br />to providing the Division with a copy of the 404 permit or documentation a 404 permit is not required <br />by the Corps of Engineers. <br />Lafarge will provide the Division with a copy of the required Corps of Engineers permit or <br />documentation that no permit is required, once it is obtained.