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-fps, ~d,~ <br />L <br />>'Yf -~~O In - Ol ~ <br />GLISTAVSON ASSOCIATES <br />GEOLOGISTS ENGINEERS APPRAISERS <br />September 8, 2006 <br />Mr. Tom Schreiner <br />Environmental Protection Specialist <br />Department of Natural Resources <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE ~PUED <br />P i i ?OOfi <br />IW619R 01 RCGlamation, <br />M(fllflg ORd Safety <br />Re: 11~~oorth Bank Pit -Regular 112 Permit Application Lass: Permi~ <br />i/bMG Response to 2nd Adequacy Letter dated May 25, 2006 <br />Dear Tom: <br />Lafazge has composed the following response to your list of adequacy review comments in your <br />letter dated May 25, 2006 and entitled " 2"d Adequacy Review Comments -North bank Pit <br />Regulaz 112 Application". We have answered the questions in the same order as you posed <br />them. Our responses aze as follows: <br />6.4.4 EXHIBIT D -Mining Plan <br />3. Water will be dischazged from the property into the Colorado River through structures <br />similaz to those at Lafarge's Mamm Creek operation. Pictures of these structures were submitted <br />previously to show the general design. Attached.~is+a<cross section of the discharge channel used <br />at Mamm Creek, which will be similaz to the one used at North Bank. Rip-rap will be used to <br />avoid scouring and erosion. The maximum velocity of dischazge to the river will be 750 gpm. <br />4a. Attached is a revised Exhibit C-Sheet 2, which shows that all planned disturbance will be <br />outside the 100-year floodplain and floodway. Lafarge shall coordinate with the US Anny Corps <br />of Engineers to verify the top of bank prior to initiating excavation activities. <br />4b. Attached is Figure Exhibit C-Sheet 3, 4, 5, and 6 showing a profile of the mining azea <br />running east to west and two cross-sections for each cell depicting the following elevations and <br />features: <br />5757 Central Avenue ~ Phone 303-443-2209 <br />Boulder, Colorado 80301 GUSTAVSON ASSOCIATES Fax; 303-443-3156 <br />