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aJ�* <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 7 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 /> 3.4 GEOMEMBRANE CUSHION MATERIAL <br /> Geomembrane Cushion Material shall consist of fine-grained soil placed as geomembrane bedding layer <br /> for the construction of the contact water pond as designated on the DRAWINGS. It is anticipated that the <br /> Geomembrane Cushion Material may be sourced from on-site alluvia l/colluvial soils. The CONTRACTOR <br /> will be responsible for processing, loading, transporting, placing, moisture conditioning and compacting <br /> Geomembrane Cushion Material. The Geomembrane Cushion Material shall conform to the following <br /> gradation and plasticity requirements: <br /> Sieve Size Percent Passing <br /> 3/ inch 100 <br /> No. 4 (4.75 mm) 60- 100 <br /> No. 200 (0.075 mm) 25 - 80 <br /> Plasticity Index(PI) > 10 <br /> 3.5 UNDERDRAIN MATERIAL <br /> Underdrain Material shall consist of processed material conforming to these SPECIFICATIONS and is to <br /> be used in construction of the underdrains. The CONTRACTOR will be responsible for manufacturing, <br /> loading, transporting, placing, processing and compacting Underdrain Material. The Underdrain Material <br /> shall be angular, durable, crushed, processed and screened, and shall conform to the following gradation <br /> and plasticity requirements: <br /> Sieve Size Percent Passing <br /> 3/ inch 95- 100 <br /> No. 4 (4.75 mm) 70— 100 <br /> No. 10 (2.00 mm) 50—80 <br /> No. 40 (0.425 mm) 10—50 <br /> No. 200 (0.075 mm) 0-5 <br /> Plasticity Index: Fines shall be non-plastic <br /> Underdrain Material shall conform with ASTM C33 requirements for Abrasion and Magnesium Sulfate <br /> Soundness. <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX <br />