2022-02-09_PERMIT FILE - M2021046 (4)

Home Browse Search

I. 1 amec foster wheeler Zephyr Gold USA Ltd. PAGE 14 OF 17 Dawson Gold Project SEC. NO.: Dawson Filtered Tailings Storage Facility SPECIFICATION 02776.0 Pre-feasibility Study TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL) Fremont County, Colorado GEOMEMBRANE 20-October-16 PROJECT NO.: 74201633 REVISION: A DATE: 20-Oct-16 • If loss of pressure exceeds 3 psi, or pressure does not stabilize, locate faulty area, repair and retest. • Puncture opposite end of the seam to release air. If blockage is present, locate and test seam on both sides of blockage. • Remove needle or other approved pressure feed device. • Repair pressure test locations as described in Article 4.8. • Beginning and ending pressures and times, test locations, documentation number, date and tester will be indicated with an indelible marker on the liner at each test interval location. The following procedures shall apply to locations where seams cannot be non-destructively tested, as determined by CONSTRUCTION MANAGER: • If the seam is accessible to testing equipment prior to final installation, the seam shall be non- destructively tested prior to final installation. • If the seam cannot be tested prior to final installation, the seaming operations shall be observed by CQA MONITOR for uniformity and completeness. In the event that seam continuity cannot be demonstrated for a non-destructive test of a fusion seam as outlined above, the CONTRACTOR shall perform the non-destructive testing over smaller areas as a means of defining the questionable area, and shall: • Extrusion weld the outside edge of the questionable seam area and vacuum box test the extrusion weld; or • Cap the questionable area and vacuum test the cap. 4.7 DESTRUCTIVE TESTING INSTALLER shall test a minimum of one (1) destructive test sample per 500 ft of seam length from a location specified by the CQA MONITOR. INSTALLER shall not be informed in advance of the sample location. The samples shall be taken centered over the seam and prioritized as follows: • A minimum of one sample per day; • All areas identified as suspect during seaming, non-destructive testing/monitoring, and in unusual working conditions. • A minimum of one sample for each geomembrane seamer. • A minimum of one sample every 500 ft of seaming. S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02776-GEOMEMBRANE.DOCX