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Surfaces of the geomembrane which aze to be repaired shall be abraded no more than one hour prior to the repair; All surfaces must be clean and dry at the time of the repair; All seaming equipment used in repairing procedures must be approved; The repair procedures, materials, and techniques shall be approved in advance of the specific repair by the Project Nfanager and ILPI; Patches or caps shall extend at least 6 inches beyond the edge of the defect, and all corriers of patches shall be rounded with a radius of at least 3 inches. 3.4.3.2 Geomembrane Verification of Repairs Each major repair requiring a patch or cap shall be identified on the as-built drawing. Each repair shall be non destructively tested using the methods described in Section 3.3.7 as appropriate. Repairs which pass the non-destructive test shall be taken as an indication of an adequate repair. Failed tests indicate that the repair shall be redone and retested until a passing test result is obtained. Patching used to repair holes and tears to be free of contamination by foreign matter. Patching to be done with a patch that has a 12-inch overlap around the damaged area. The patch is to be tucked into place with excess bentonite poured over the overlap. 3.~ Bacl:filline of Anchor Trench The anchor trench, if any, shall be adequately drained to prevent ponding or otheRVise sofrening of the adjacent soils while the trench is open. The anchor trench shall be backfilled by the Earthwork Contractor or as outlined in the specifications and bid documents. Since backfilling the anchor trench can effect material bridging at toe of slope, consideration should be given to backfill the liner at its most contracted state; preferably during the cool of the morning or extended period of overcast skies. Caze should be taken when backfilling the trenches to prevent any damage to the geosynthetics. 3.6 Lining System Acceptance The geosynthetic lining system shall be accepted when: The installation is finished; 27