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16. Lafarge does not expect any impacts to surface or groundwater and resulting feature from <br />mining activities because other than the two wells on the property, the property is separated from <br />neighboring properties to the east and west respectively by natural drainages that will remain. <br />Lafazge will not be mining and/or disturbing these drainages. Therefore no "negative gradient" <br />will be created on the east and west property boundaries. Since the Colorado River forms the <br />south boundary and is the ultimate destination of all of the groundwater in the area, there are no <br />neighbors to impact and the volume of the river is sufficiently lazge as to not be negatively <br />impacted. With regazd to the two wells, one is owned by the property owners and the other a <br />neighbor. Since they are up-gradient, and there is a significant hydrologic gradient towazd the <br />river, Lafazge's Mamm Creek experience indicates that no impacts should occur. <br />18. A weed management plan for Mamm Creek was submitted previously only as an <br />example. A fmal plan including management of Tamarisk and Russian Olive will be submitted <br />to the DMG once we have conditions and recommended seed mixes. Lafarge commits to <br />supplying the weed management plan within 90 days of application approval. <br />20. A wetland delineation has been completed for the site and was submitted to the US Army <br />Cops of Engineers for a jurisdictional determination on June 2Q 2006. The delineation identified <br />2.50 acres of jurisdictional wetlands and 0.07 acres of jurisdictional waters within the permit <br />azea. A copy of the delineation is attached. Lafarge is still awaiting a decision from the <br />USACE. <br />21. Lafazge understands that the Division reserves the right to determine whether a permit <br />modification will be processed as an amendment or a technical revision. <br />22. As we discussed during our meeting with you on August 4, 2006, the Geotechnicai <br />Stability Report submitted previously included North Bank (formerly called McBride) as well as <br />the Marnm Creek side of the Colorado River. The property owners of both sites entered into an <br />oil and gas lease with an oil company, which completed a geotechnical stability report for both <br />properties, as part of the lease agreement. The stability report was submitted with the original <br />application. It incorporated all of the oil well pads, pipelines, roads, etc. for the two properties. <br />For the North Bank property, please refer to the report Figures 9-12 and 16. Additionally, <br />Lafarge submitted a letter dated May 11, 2006, signed by K. M. Kolin, addressing the slope <br />stability analysis for the house just outside the mining azea, as a response to the First Adequacy <br />Letter. <br />Please contact Mark Vigil at 303-657-4336 or me at 303-443-2209 if you have any other <br />questions regarding this submittal. <br />Sincere <br />John W. Rozel e, P.G. <br />Principal Geologist <br />5757 Central Avenue ~ Phone 303-443-2209 <br />Boulder, Colorado 80301 cusrnvsoN AssoCinrrs Fax: 303-443-3156 <br />