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1 Ito TETRA TECH <br />October 16, 2009 <br />Mr. Jared Ebert <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: First Response to Adequacy Review #1 Comments for Lafarge West, Ines <br />Greeley 35th Avenue Mine, DRMS File # M-1977-036, Amendment 01 <br />Dear Jared: <br />This letter is in response to your Adequacy Review #1 Comments for Lafarge West, Inc's <br />Greeley 35th Avenue Mine, DRMS File # M-1977-036, Amendment 01. Some of your <br />comments will take us additional time to respond to. However, Lafarge would like to <br />have this application approved no later than the end of this year, consistent with our new <br />Decision Date of December 31, 2009. Therefore, we are submitting responses to the <br />comments that we are able to address now and will be following up with you again when <br />the rest of the comments have been addressed. <br />Below is a listing of each of your comments followed by our responses. To help you <br />track responses to all of the comments, we have even listed those comments that we will <br />respond to later and have just indicated that as our response. <br />6.4.3 EXHIBIT C - Pre-mining and Mining Plan Map(s) of Affected Lands <br />1. Contour lines are provided for the expansion area: however, the way they are labeled <br />is confusing. There are multiple numbers along the contours expressing the elevation. <br />It is unclear which elevation designation goes to which contour. Please clearly label <br />the contours in such a way that the direction and rate of slope can be determined. <br />We have modified the labels on the contours to make the information more clear. <br />2. Also, in order to evaluate the present level of disturbance for the current affected <br />land, please submit a topographic map with contours of sufficient detail to determine <br />the direction and rate of slope for all the current affected land within the permit area. <br />This is necessary in order to evaluate the financial warranty. The division will <br />needed to know the angle of the current pit slopes to determine how much earthwork <br />is needed to reclaim the land at the present time. <br />This information is currently unavailable. We are acquiring it and will follow-up to <br />provide this information to you as soon as possible. <br />1900 S. Sunset Street, Suite I-F Longmont, CO 80501 <br />Tel 303.772.5282 Fax 303.772.7039 www.tetratech.corn