ARCHIVED REPORTS_2001_2 - Laserfiche WebLink

Home Browse Search

Two opposite specimens, each 1 -inch wide, shall be cut from the trial seam sample by the Contractor and/or Liner Subcontractor. Under the observation of a Geotechnical CQA Monitor, the specimens shall be tested by the Liner Subcontractor in shear and peel using a field tensiometer to verify that seams satisfy peel and tensile strength requirements. If a specimen fails, the seaming equipment and seamer shall not be accepted and shall not be used for seaming until the deficiencies are corrected and two consecutive successful full trial welds are achieved. After completing a successful trial/nondestructive sample, the Contractor and/or Liner Subcontractor shall cut a 2'x 2' remnant from the sample and mark the welder number, date, time, ambient temperature, welder temperature, and speed and submit it to the Geotechnical CQA Monitor -who -will assign an identification number and enter the information on the non-destructive sample form. The results of field tests carried out on trial seams shall be documented by the Geotechnical CQA Monitors. General Seaming Procedure Unless otherwise specified, the general seaming procedure to be used by the Contractor and/or Liner Subcontractor shall be as follows: All VFPE seams shall be overlapped a minimum of four (4) inches. "Fishmouths" or wrinkles at the seam overlaps shall be cut along the ridge of 'the wrinkle in older to achieve a flat overlap. The cut "fishmouths" or wrinkles shall be seamed and any portion where the overlap is inadequate °shah then be -patched with -an oval orround-patchof the same VFPE trxtentting a minimum of 6 inches beyond the cut in all directions. All corners of the pat�ch-•shai-1,be r-ounded with -a 1 -inch mini rn-radius. • Adjacent to anchor trenches, seaming shall extend up the panels a minimum of 12-inches.,pastAhe crest -of the anchor.trench. • All cross seams shall be offset at least two feet from the cross seam of the adjacent panel and be extrusion or wedge welded where they intersect. The Geotechnical CQA Monitors shall observe that the above seaming procedures are followed, and shall inform the Construction Manager if they are not. 6.2.5 CONSTRUCTION TESTING 6.2.5.1 Nondestructive Seam Testing The Contractor and/or Liner Subcontractor shall non-destructively test all field seams over their full length using a vacuum test unit, spark detector, or an air pressure test (for double wedge fusion seams only), as described below. The purpose of nondestructive tests is to check the continuity of seams. It does not -24- CA2001-048\FINAL COVER_CQA.DOC\08/20/01 Geologic Associates