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Each repair shall be non-destructively tested using methods identified in Part VI:Non-Destructive <br /> Seam Continuity Testing of the aforementioned manual "Polyethylene Geomembrane Product <br /> Specifications", as appropriate. The appropriate test procedure shall be selected by qualified <br /> field personnel in consultation with (and subject to agreement thereto) an independent Colorado <br /> Registered Professional Engineer (see also Section 3.3: Verification of Repairs, below). <br /> Dependent on the characteristics of the damage/defect area and the subsequent repair, non- <br /> destructive testing of all repair seams shall be carried out over their full length(to ensure continuity <br /> of seams) using a vacuum test unit, air pressure testing, or other approved method, as per the <br /> following: <br /> • Vacuum Box Testing—utilized almost exclusively for evaluating extrusion weld bead quality; <br /> • Air Channel Pressure Testing (ASTM D5820) — applicable only to seam continuity testing of <br /> air channels produced using dual track hot wedge welding equipment; <br /> Repairs that pass the non-destructive test shall be accepted as indicative of proper and adequate <br /> repair. Failed tests shall be indicative that the repair is defective and that said repair shall be <br /> redone and re-tested until a passing result is obtained. <br /> 3.3 Verification of Repairs and Recertification <br /> All repair actions will be carried out by qualified personnel and under the observation of an <br /> independent Colorado Registered Professional Engineer (PE). In addition to daily logs that are <br /> to be prepared by the installation/repair crew, the designated PE shall also maintain a field log <br /> documenting each discrete repair action, referenced by number, and such additional information <br /> as may be deemed appropriate. The PE documentation (and other field data, as appropriate)will <br /> be entered into a final report to be provided to DRMS on completion of the repair effort. <br /> This PE documentation of satisfactory repair of all identified damage areas or defects shall serve <br /> as the basis for recertification of the composite liner system, and the PE shall provide in the final <br /> report a statement to that effect, along with signature and seal,thereby attesting to the completion <br /> of satisfactory repair and recertification of the EPF composite liner system. <br /> 3.4 Post Repair/Recertification Actions <br /> At the conclusion of the removal action, liner system repair, and recertification, VRI will undertake <br /> the following: <br /> (a) Liquids—Either return to the recertified EPF impoundment; or, dispose through other <br /> methods to be determined. In the event`other methods"are employed,VRI will ensure <br /> that disposition is carried out in a manner consistent with applicable laws, regulations, <br /> and ordinances. <br /> 14 <br />