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• Capping - used to repair failed welds or liner seams where welds cannot be non-destructively tested. • Removal - used to replace areas with large defects where the preceding methods are not appropriate. Also used to remove excess material (wrinkles) from the installed VFPE. 6.2.6.3 Seam Test Summary Documentation of all nondestructive and destructive seam testing results, including repairs, shall be summarized by the Geotechnical CQA Officer. 6.2.7 WRINKLES When placing soil or drain materials over the VFPE, temperature changes or creep may cause wrinkles to develop in the VFPE. Any wrinkles that can fold over shall be repaired either by cutting out excess material or, if possible, allowing the VFPE to contract due to temperature reduction. In no case 'hail material be placed over the VFPE that could result in the VFPE folding. All folded VFPE shall be removed. No material shall be placed in areas wbere liner is not in contact with the supporting subgrade. 6.2.8 ANCHOR TRENCH The anchor trench shall be adequately drained to prevent ponding or softening of the adjacent soils while the trench is open. The anchor trench shall be backfilled and compacted as outlined in the Specifications. Fill soils shall consist of on-site granular'soil essentially free of organic and deleterious material and approved by the Geotechnical CQA Monitor and Construction Manager. The material shall have a'maximumparticle size of 1 inch. Care .,shall be taken,.when.backfilling the trenches to prevent any.danaageao .the geosynthetics. The Geotechnical CQA Monitor shall observe the bottom of the trenches prior to fill placement to ensure they are free of loose and disturbed materials. The Geotechnical CQA Monitor shall also observe the backfilling and compaction operation, and shall notify the Geotechnical CQA Officer and the Construction Manager of work performed not in accordance with the Project Specifications. 6.2.9 VFPE ACCEPTANCE The Contractor/Liner Subcontractor shall retain all ownership and responsibility for the VFPE until acceptance by the Owner. The VFPE shall be accepted by the Owner when: • The installation is finished and approved. • All seams have been inspected and approved. -30- C\2001-048TINAL COVER CQA.DOC\08/211/01 Geologic Associates