2006-06-13_REVISION - M2004009 - Laserfiche WebLink

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Page 3 to other locations at all other times. The asphalt plant would remain on [he site throughout the year, but is completely portable and is self-contained. • All processing plants at this site would be operated "dry": there are no liquid materials used in any manufacture of the products. Asphaltic oil is maintained in a liquid state only by the addition of heat. If liquid asphaltic oil (asphalt cement) spills onto the ground, it hazdens in approximately one hour. It is completely insoluble and cannot enter the environment. All plant areas aze bermed to contain runoff and any diesel or gasoline tanks used in the operation of the plants (if any plants aze allowed on this site) would be bermed and lined with a geotextile fabric. The stormwater plan would be amended to show the addition of the two processing plants, if any plants aze located on the permit area. Individual spill control plans would be amended to show the location of the plants onto this site. The Colorado Dept. of Environmental Health and the Weld County Health Dept. have jurisdiction in these matters. • No chemicals aze used in the operation of a recycle plant or the gravel plant. The only chemicals, as reported under SARA Title III, used in the production of asphalt are lime, fly ash and asphaltic oil. Diesel fuel would be used to operate the plant burner and this fuel, and information on all other chemicals described above, are contained within the stormwater Plan and MSDS sheets kept at a speciFic plant. • As described above, no chemicals in the operation of any of the plants would enter into the environment. The only possibility would be diesel fuel from the operation of the asphalt plant and any tanks associated with this operation would be located within a bermed and lined containment area, designed large enough to hold the contents of the largest tank, should rupture occur. All this information is contained within our stormwater plans for each operation. The stormwater plan for the Turnpike site would be amended to show the addition of the recycle and asphalt plants. The current stormwater plan shows only the gravel plant operation. 10. The maximum amount of broken concrete and broken asphalt to be recycled and the finished product (crushed concrete roadbase and crushed recycled asphalt to be recycled into asphalt mixes) would not exceed 60,000 tons each. These products aze generally inert, especially asphalt, and cannot enter into the environment. All stockpile locations and the plant sites would be graded and compacted and will have perimeter berms. Exhibit D now includes this information. 11. There is only a stormwater plan required for the current gravel plant operation at the Turnpike site. Should an asphalt plant be located on this permit site, an SPCC plan will be developed. The recycle plant would be powered electrically and so no SPCC plan would be required. 12. The excavated pits are mined to the top of the underlying shale bedrock. This depth, including overburden, averages 16 f[ over the entire site. Naturally occurring alluvial groundwater occurs near the top of the sand and gravel deposit, as noted from past drilling and logging of holes on this property by others. Therefore, without dewatering and any offsite impacts (adjacent dry mining), the top of the alluvial groundwater occurs at an average of 6-7 ft below natural ground surface. All mining Cells that are to be backfilled will be backfilled to achieve an elevation of a minimum of two feet above the naturally occurring water table, i.e., 4 to 5 feet below the former natural ground surface. This information is included in the revised Exhibit G, which is enclosed. Cell 4 will be clay lined at reclamation, enabling it to exist as a dry depression, though mined below normal water [able elevation. The configuration of the clay liner shall be [he same as shown for Cell 1 (see Exhibit F, Sheet 3). 13. See the following