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aJ�* <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 10 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 /> non-noxious, quick-growing, annual and perennial plants, approved by MANAGER, which shall be <br /> seeded or planted during the first appropriate growing season after removal. <br /> 4.3 SUBGRADE PREPARATION AND FOUNDATION ACCEPTANCE <br /> Rockfill and structural fill shall not be placed until the foundation has been inspected and accepted by the <br /> CQA MONITOR(S). The CONTRACTOR shall remove unsuitable materials, roads, slope wash, and all <br /> other deposits that have accumulated within the area after excavation and foundation clearing have been <br /> competed in accordance with the ENGINEER'S recommendations. <br /> The CQA MONITOR(S) will inspect and approve the exposed subgrade prior to any fill or geosynthetics <br /> being placed to confirm that the surface of the subgrade is smooth and free of debris, grade stakes, large <br /> rocks, roots, branches, vegetation, mud, or cracks larger than one-quarter inch (0.25 in) in width. The <br /> subgrade shall have no sudden sharp or abrupt changes in grade. Protrusions extending more than 0.5 <br /> inches from the surface shall be either removed, crushed, or pushed into the surface with a smooth-drum <br /> compactor. <br /> Prior to placement of fill materials, CONTRACTOR shall scarify all in-situ materials to a depth of 6 inches, <br /> moisture condition, and recompact the subgrade. Compactive effort shall be adequate to obtain a minimum <br /> of ninety-five (95) percent of maximum dry density as determined by the Standard Proctor test (ASTM <br /> D698)for the particular fill material. Moisture conditioning shall be adequate to achieve a uniform moisture <br /> and density. If rock is encountered, the CONTRACTOR shall prepare the subgrade by removing loose <br /> rock fragments until competent foundation material is encountered as approved by ENGINEER. <br /> 4.4 CQA TESTING <br /> The CQA MONITOR(S) will take samples of materials and perform testing in the borrow areas, stockpile <br /> areas, and the embankments as a quality assurance check on quality control testing done by the <br /> CONTRACTOR. Testing by the CQA MONITOR(S)will not relieve the CONTRACTOR of responsibility for <br /> quality control testing by the CONTACTOR to ensure compliance with the SPECIFICATIONS. The results <br /> of field and laboratory testing will be made available to the OWNER, MANAGER and CONTRACTOR. <br /> 4.5 FILL PLACEMENT AND COMPACTION <br /> 4.5.1 GENERAL GUIDELINES <br /> No fill materials shall be placed until the foundation and subgrade preparations have been completed. No <br /> organic soil, brush, roots, sod, or other deleterious or unsuitable materials shall be incorporated in the fills. <br /> The distribution of materials shall be such that the fill is free from voids, lenses, pockets, streaks, or layers <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX <br />