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Also at each major public access to the mine area is an orange sign with black <br /> lettering that warns of blasting operations taking place and that clearly <br /> explains the blasting signals used at the Trapper Mine . Mounted directly below <br /> this is a sign stating "Warning! Explosives in Use" (Figure 3. 1-2) . Addition- <br /> ally, bright orange cones and octagonal signs are used to mark and identify the <br /> immediate blasting area. Signs are located at each mine road within 50 feet of <br /> the blasting area. These signs are rectangular in shape and state "Danger Blast- <br /> ing Area" (Figure 3. 1-2) . <br /> Topsoil markers are used to identify all topsoil storage areas. Two types are <br /> used . However, both are similar in that a large black "T" is displayed to iden- <br /> tify topsoil stockpiles (Figures 3. 1-3) . <br /> Perimeter markers identify the perimeter of the permit area. These markers are <br /> located at corners and on line where needed to clearly identify the permit area. <br /> Again , two types of markers are used . Each is identifiable by a large black "P" <br /> facing towards the permit area ( Figures 3.1-4) . <br /> Both the topsoil and perimeter markers are mounted on the top of steel posts at <br /> an appropriate height to be seen above the surrounding vegetation. <br /> 3-4 <br />