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Mr. Michael Cunningham <br />CDRMS <br />November 26, 2013 <br />• Pre - existing mill disturbance includes, topsoil, and <br />historic ore stockpiles, access roads, tailings pond, mill <br />building, culverts and fences; <br />• Pre - existing easements including Leadville Sanitation <br />District sewer pipeline, Xcel Energy gas pipeline, and <br />Xcel Energy transmission line. <br />• Site Soil Information: Existing soils data for the drainage area <br />within the permit and affected areas are provided through the <br />National Resource Conservation Service Custom Soil <br />Resource Report for the Lake County Area, Colorado. The <br />soils are thin, well drained, well vegetated with the existing <br />rocky slopes ranging from 3 -35 %. The soils are considered to <br />be relatively stable to limit offsite erosion and sedimentation <br />impacts. <br />• Existinq Vegetation: Coniferous trees cover the site, except <br />the area where the Mill building is located. Lodge pole Pine is <br />the predominant tree species. Approximately 1.7ac of trees <br />and underlying vegetation was removed during construction of <br />the TSF. <br />• Potential Pollution Sources: Mill features are shown in <br />Attachment 2. The following provides a general description of <br />each potential source: <br />■ Chemical Storage <br />Frequency <br />Activity <br />Containment <br />Weekly <br />Load 55 gallon drum(s) <br />Diversion berms and a <br />or other suitable <br />containment basin will be <br />container of process ore <br />put in place to prevent <br />concentrate into truck for <br />sediment migration. <br />offsite hauling <br />Monthly <br />Chemical delivery will be <br />Chemicals will be stored <br />delivered to the Mill <br />in the mill. Chemicals will <br />be stored in 55 gallon <br />drums or sacks. 55gallon <br />drums will be placed in <br />secondary containment <br />vessels. Other chemicals <br />to be used on site will <br />include paints, aerosols, <br />lubricant oils, and <br />antifreeze. All chemicals <br />will be stored and locked <br />in the Mill Building. <br />Truck haulage - to control fugitive dust, speed limits of <br />15 miles per hour for haul trucks will be posted to limit <br />road dust; <br />When necessary, roads will be periodically sprayed <br />with water to control fugitive dust; <br />BMPs will be inspected twice a month and after <br />significant precipitation during construction, and <br />monthly thereafter during milling operations from April <br />through November; <br />