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aJ�* <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 9 OF 15 <br /> Dawson Gold Project SEC. NO.: <br /> Dawson Filtered Tailings Storage Facility SPECIFICATION 02200.0 <br /> Pre-feasibility Study <br /> TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL) <br /> Fremont County, Colorado EARTHWORKS 20-October-16 <br /> PROJECT NO.: 74201633 REVISION: A <br /> DATE: 20-Oct-16 <br /> Riprap Stone Size Percentage <br /> Passing <br /> 1.5 D50 to 1.7 D50 100 <br /> 1.2 D50 to 1.4 D50 85 <br /> 1.0 D50 to 1.4 D50 50 <br /> 0.4 D50 to 0.6 D50 15 <br /> 4.0 EXECUTION <br /> 4.1 CLEARING AND GRUBBING <br /> Clearing and grubbing shall be done within the footprint of the limits of the construction area, as <br /> delineated on the DRAWINGS. Clearing shall extend a maximum of 30 feet and a minimum of 10 feet <br /> outside of the construction limits or as directed by MANAGER. Areas for clearing shall be released to <br /> CONTRACTOR by MANAGER. No pioneering of roads across undisturbed areas shall be allowed <br /> without prior approval of MANAGER. <br /> Clearing shall consist of cutting brush to the ground level, removing such material, along with wood, <br /> rubbish, tree stumps, and any other vegetation with roots in excess of 1-inch diameter, and other <br /> deleterious materials. Stripped and grubbed vegetation shall be removed and disposed of in stockpiles or <br /> other approved methods in an area designated by MANAGER. <br /> 4.2 TOPSOIL REMOVAL <br /> Topsoil is defined as an acceptable growth medium as approved by MANAGER that has no chemical or <br /> physical characteristics which will exclude its use as such. CONTRACTOR shall excavate and remove <br /> topsoil in a manner that will minimize contamination with other soil horizons, and will take such measures <br /> as are necessary to ensure that the removal of topsoil does not result in erosion or excessive <br /> sedimentation. <br /> CONTRACTOR shall stockpile topsoil at locations designated by MANAGER. Stored topsoil shall not be <br /> disturbed by mining operations or construction activities, and shall be protected from wind and water <br /> erosion, compaction, and contamination. CONTRACTOR shall grade topsoil stockpiles to prevent <br /> erosion and ponding of precipitation in the stockpile areas. The maximum topsoil stockpile height will be <br /> approved by MANAGER. The CONTRACTOR shall protect stockpiled topsoil by an effective cover of <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX <br />