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amec <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 8 OF 8 <br /> Dawson Gold Project SEC. NO.: <br /> Dawson Filtered Tailings Storage Facility SPECIFICATION 02777.0 <br /> Pre-feasibility Study <br /> TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL) <br /> Fremont County, Colorado GEOTEXTILE 20-October-16 <br /> PROJECT NO.: 74201633 REVISION: A <br /> DATE: 20-Oct-16 <br /> Following the installation of all geotextile, an examination of the entire surface shall be conducted to detect <br /> potentially harmful foreign objects. Any such foreign objects found shall be removed or the panel shall be <br /> replaced by the CONTRACTOR. <br /> Geotextile panels shall not be deployed over frozen ground, unless approved by CQA MONITOR. <br /> Geotextile panels shall be either welded or overlapped as approved by ENGINEER. Where overlaps are <br /> approved,the overlap must be in accordance with MANUFACTURER'S recommendations or DRAWINGS, <br /> whichever is more stringent. <br /> 4.2 JOINTS <br /> All geotextile overlaps shall be continuously field seamed using light weight hand-held wedge welders or <br /> similar thermal equipment suitable for geosynthetic welding (i.e., hot air spot welding and flame bonding <br /> are not allowed). Geotextiles shall be overlapped a minimum 4 inches prior to welding. No horizontal <br /> seams shall be allowed on slopes steeper than 5HA V (horizontal:vertical) (i.e., seams shall be along, not <br /> across, the slopes), except as part of a patch, unless approved by the CQA MONITOR or ENGINEER. <br /> No horizontal seam shall be closer than 5 feet to the toe of the slope or other areas of potential stress <br /> concentrations. <br /> Areas to be seamed shall be clean and free of foreign material. <br /> 4.3 PLACING PRODUCTS OVER GEOTEXTILE <br /> Before placing material over geotextile, notify CQA MONITOR. Do not cover installed geotextile prior to <br /> receiving authorization from the CQA MONITOR to proceed. <br /> If tears, punctures, or other damage occurs to the geotextile during placement of overlying materials, <br /> remove overlying materials as necessary to expose the damaged geotextile. Repair damage as indicated <br /> below. <br /> 4.4 REPAIRING GEOTEXTILE <br /> Repair or replace torn, punctured, flawed, deteriorated, or otherwise damaged geotextile. Repair damaged <br /> geotextile by placing patch of undamaged geotextile over damaged area plus at least 12 inches in all <br /> directions beyond damaged area. Remove interfering material as necessary to expose damaged geotextile <br /> for repair. Heat weld patches or secure them as indicated above, or by other means approved by the CQA <br /> MONITOR. <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02777-GEOTEXTILE.DOCX <br />