2005-02-11_REVISION - M2000016 (2)

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Letter to Lafazee West, Inc. 2 February 11 2005 Platte River channel and along the outside edge of a river bend. How will these stockpiles be protected from undercutting at the toe of the stockpiles during high flows, and how will e nver e pro ec e m e event at t e stoc i es may erode or slump into the channel? 2. Exhibit D- Mining Plan a) On page 12 of the Application, in the "Mining Plan section" it is stated that there are concrete and asphalt plants on the site; it is assumed that afueling/lubrication station will also be located on the site. What protection measures will be used to ensure that spills of asphalt and/or concrete materials will not contaminate the surface or ground water? Will concrete trucks bewashed-out at the site? If so, what measures will be utilized to contain the wash water? In the event of a spill what measures will be taken to capture the spilled fuelsJlubricants. Any protective berms should be designed to contain 100% of the volume of stored material. The Division recommends that the storage area(s) be located outside the floodplain. If it is necessary to have storage areas within the floodplain, the applicant must also describe protection measures that will be employed to contain the materials in the event of a flood. b) If any of the concrete batch plant, asphalt plant or fueling lubrication station structures are permanent installations, e.g. on concrete foundations, their location, size and type of - eonstnrcti a ivision can me u e a emo i ion cost in the financial warranty calculation. Please provide this information. 3. Exhibit G Water Information and Additional Hydrologic and Geotechnical Information A copy of a separate review of these issues is enclosed. Please seethe attached memo from Kathleen Sullivan P.E., of the Division. 4. Exhibit H Wildlife Information and Exhibit C Mine Plan Maps a) A review of the mine plan maps shows a 200 foot setback from the mining limits to the South Platte River, but also shows disturbance boundaries which aze much closer to the river, in some azeas possibly as close as 20 to 30 feet, including the location of topsoil overburden stockpiles. In the comment letter from the Colorado Division of Wildlife (DOW), dated January 21, 2005, it is stated, "In order to protect the riparian area and the diversity of lazge and small mammals, birds, and herptiles that inhabit the site, a 200' setback from the western shoreline of the river is recommended. It is also recommended to keep as many of the mature cottonwoods as possible, and leave snags where feasible." Please submit a plan to leave a 200 foot undisturbed riparian corridor between the disturbed area and the riverbank and describe how this area will be protected from any accidental disturbance. Also describe what number (or azeas) of mature