2013-07-23_REVISION - M2012032 (10)

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Geotextile Product Data Sheet PROPERTY 8oz Mechanical Mass /Unit Area (Typical) ASTM D -5261 8.0 oz /yd2 Tensile Strength (Grab) ASTM D-4632 2051bs Elongation ASTM D-4632 50% Puncture ASTM D-4833 110 Ibs CBR Puncture ASTM D-6241 525 lbs Mullen Burst ASTM D -3786 350 psi Trapezoidal Tear ASTM D -4533 80 Ibs Endurance UV Resistance% Retained at 500 hrs ASTM D-4355 70% nrul aunt Apparent Opening Size Permittivity Water Flow Rate Roll Sizes C) Mine Water Pond Design ASTM D -4751 ASTM D-4491 ASTM D-4491 80 US Std. Sieve 1.50 sec i 110 gpm/ftz 12.5ftx360ft 15ftx300ft The two 8" diameter gathering pipes will each have a valve at their end in the mine water pond, to allow for maintenance of the pond. The pipe invert elevation will be a minimum of 1.0 feet above the pond bottom. The pond will be excavated to the dimensions as shown on Map G -10, and will hold a volume of approximately 14,500 cubic feet. A 4" diameter Schedule 40 PVC pipe will be placed in the pond bottom and will discharge to Sneffels Creek only if maintenance is needed to the pond and it would need to be fully drained. A valve on the inlet will be closed during normal operation. Map G -11 also shows the cross section of the pond and the spillway detail. The pond will be lined with one layer of 36" thick felt at the bottom followed by a 45 mil Polypropylene liner. This is used in place of an EPDM liner since it is much stronger in tension on the slope. The pond slopes are excavated to a maximum of 1.5H:1V slope on the inside and will be excavated from existing waste rock on site. The Polypropylene liner will be anchored in a trench at the top of the pond. This trench will be 2 feet deep, and the fabric will then extend one foot horizontally in the trench. Waste rock 4