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amec <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 7 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 /> TABLE 02777.0-1 <br /> AVERAGE ROLL VALUES FOR 12 oz/yd3 NON-WOVEN GEOTEXTILE <br /> Property Requirement Test Method <br /> Mass Per Unit Area 11.9 ASTM D5261 <br /> Apparent Opening Size (max.) No. 80 to 140 ASTM D4751 <br /> Sieve <br /> Puncture Strength (min.) 130 Ibs ASTM D6241 <br /> 4.0 EXECUTION <br /> 4.1 PLACING GEOTEXTILE <br /> CONTRACTOR shall handle geotextile in a manner to ensure that geotextile is not damaged, and shall <br /> comply with the following: <br /> • Notify the CQA MONITOR whenever geotextile is to be placed. <br /> • Do not place geotextile prior to obtaining CQA MONITOR'S approval of underlying materials. <br /> • No equipment or tools shall damage the geotextile by handling, transporting, or other means. <br /> No personnel working on the geotextile shall smoke, wear damaging shoes or engage in other activities <br /> that could damage the geotextile. <br /> Cross seams between two (2) panels of geotextile shall be staggered by a minimum distance of 5 feet on <br /> slopes greater than ten (10) percent. <br /> In the presence of wind, all geotextile shall be weighted with sandbags or the equivalent. Such sandbags <br /> shall be installed during deployment and shall remain until replaced with cover material. <br /> Geotextile panels shall be deployed in such a manner as to preclude wrinkles and folds. Any wrinkle or <br /> fold that may manifest itself into other geosynthetic layers shall be removed. If necessary, the <br /> CONTRACTOR shall position the geotextile by hand after it is unrolled to eliminate wrinkles. <br /> During placement of geotextile, care shall be taken not to entrap, in or beneath the geotextile, excessive <br /> dust, mud, or moisture that could cause clogging of drains or filters, or hamper subsequent seaming. <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02777-GEOTEXTILE.DOCX <br />