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~FARGE <br />NORTH AMERICA <br />AGGREGATES, CONCRETE <br />& ASPHALT <br />No stockpiles will be placed near the South Platte River, at the request of the DOW an <br />undisturbed 200-feet offset from the South Platte River will be maintained. Exhibits C2, <br />C3, and C4 have been revised, see enclosed maps. <br />2. Exhibit D -Mining Plan <br />a) On page 12 of the Application, in the "Mining Plan section " it is stated that there <br />are concrete and asphalt plants on the site; it is assumed that afueling/lubrication <br />station will also be located at the site. What protection measures will be used to <br />ensure spills of asphalt and/or concrete materials will not contaminate the surface or <br />ground water? Will concrete trucks be washed-out at the site? If so, what measures <br />will be utilized to contain the wash water? In the event of a spill what measures will <br />be taken to capture the spilled fuels/lubricants? The Division recommends that the <br />storage area(s) be located outside the floodplain. If it is necessary to have storage <br />areas within the floodplain, the applicant must also describe protection measures <br />that will be employed to contain the materials in the event of a~lood. <br />If storage of petroleum products exceeds the thresholds designated in federal regulations, <br />a Spill Prevention Control and Countermeasures (SPCC) Plan will be developed in <br />accordance with the regulations. Any protective berms required in this plan will be <br />designed as required by federal regulations. At Lafarge concrete plants, concrete wash <br />water is generally contained in a concrete lined settling basin that allows for recycling of <br />the wash water. If storage areas are located in the floodplain, additional protective <br />measures for storage tanks will be utilized as required in the Flood Hazard Development <br />Permit issued by the county. <br />b) If any of the concrete batch plant, asphalt batch plant or fueling lubrication station <br />structures are permanent installations, e.g. on concrete foundations, their location, <br />size, type of construction must be provided in the application so the Division can <br />include a demolition cost in the frnancial warranty calculation. Please provide this <br />information. <br />The location of all structures are identified on Exhibit C enclosed. The typical <br />dimensions of a concrete plant are 60 ft by 30 ft or approximately 1800 sq. ft. The <br />typical dimensions of an asphalt plant are 20 ft by 40 ft or approximately 800 sq. ft. In <br />past permit applications Lafarge has used and the division has accepted $50,000 per <br />structure as a proposed reclamation cost. <br />3. Exhibit G -Water Information and Additional Hydrologic and Geotechnical Information <br />A copy of a separate review of these issues is enclosed. Please see the attached memo from <br />Kathleen Sullivan P.E., of the Division. <br />LAFARGE NORTH AMERICA INC. -Aggregates, Concrete & Asphalt <br />10170 Church Ranch Way Suite 200, Westminster, Colorado 80021 <br />Telephone: (303) 657-4000 Facsimile: (303) 657-4037 <br />