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spray paint depicting the full perimeter. A "Damage Report" will be prepared, and each discrete <br /> area will be assigned an identifying number with the location noted on a sketch map, referencing <br /> distance and direction from a common control point (VRI anticipates utilizing the centroid of the <br /> leachate sump as the control point). Field documentation of these locations (i.e., inspection <br /> notes) will include information as to the type of damage, lateral or areal extent, probable depth <br /> influence or deformation, and other discernible characteristics associated with the damaged grid <br /> area/feature (and/or underlying liner component(s), as may be applicable). <br /> 3.2 Damage and/or Defect Repair <br /> VRI will place greatest emphasis on ensuring integrity of the primary "impermeable" liner <br /> components(i.e., the 60 mil HDPE Geomembrane and the underlying Bentomat DN Geosynthetic <br /> Clay Liner, respectively) as these two components are the essence of the liner system. Inasmuch <br /> as the designated function of the (uppermost) geotextile drainage layer was/is to facilitate drain <br /> down of entrained tailing pore water, damage to the geotextile drainage layer component will be <br /> addressed through visual observation and determination of damage (e.g., HDPE grid rupture or <br /> tear, degraded or missing geotextile material, etc.) and it is anticipated that damaged portions will <br /> be either replaced and/or augmented with overlapping placement of an equivalent geotextile <br /> drainage layer component. Damaged/removed portions of this liner component will be disposed <br /> at an offsite non-hazardous waste facility. <br /> Damage repair relative to the primary liner components will be dependent upon the type, <br /> frequency, and extent of damage noted during the inspection and assessment phase. VRI <br /> anticipates that damage repair methods will include, and be carried out in general accordance <br /> with, the specifications provided in the Colorado Lining International, Inc. geomembrane <br /> installation guideline document (see Attachment IV: Polyethylene Geomembrane Product <br /> Specifications), as per the following: <br /> • Patching — which may be used to repair large holes, tears, and contamination by foreign <br /> matter; <br /> • Grinding and re-welding—which may be used to repair small sections of extruded seams; <br /> • Spot welding or seaming — which may be used to repair pinholes or other minor, localized <br /> defects; and/or <br /> • Capping—which may be used to repair large lengths of damaged or failed seams. <br /> Methods for patching lining system defects shall consist of welding patches or caps over such <br /> areas using the same membrane lining material as previously used on the project. Patches or <br /> caps shall extend at least 6-inches beyond the edge of the defect, and all corners of patches shall <br /> be rounded with a radius of at least 3-inches. <br /> All seaming, preparation, and welding equipment deployment procedures will be consistent with <br /> established procedures employed during initial liner system installation. <br /> 13 <br />