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WMU FU-03,WMU F-West Leachate Impoundment and Desilting Basin February 2004 Forward Landfill Job No.021605.03 5.3.2.2 Field Seaming ® Seam Layout Vector's CQA Monitor documented that the seam numbering system is compatible with the panel numbering system. A seam numbering system was assigned by using both panel numbers separated with a dash (i.e.: as in 3/4 is the seam of panel 3 and panel 4) • Seaming Equipment and Products Vector's CQA Monitor observed that the seaming equipment used by the subcontractor was in accordance with the project specifications. In addition, Vector verified that the extrudate (welding rod) used was compatible with the geomembrane material and was comprised of the same resin as the geomembrane. The liner crews seamed the HDPE geomembrane panels using double wedge and extrusion welding techniques. The majority of seams were joined using double wedge welders, with difficult geometry and repairs made using extrusion welders. Vector's CQA Monitor observed the seaming activities and observed for proper panel overlap, cleanliness of the seams, grinding where required, and speed and temperatures of the equipment used. Documentation of the activities was recorded on the geomembrane seaming log, which include information on the seam number, date, time, welding machine, technician, machine temperature, and wind condition. The geomembrane seaming logs are included in Appendix I. Seam Preparation Vector's CQA Monitor observed that the preparation of the seams was in conformance with the project specifications and the seam area was clean and free of moisture, debris and foreign materials prior to seaming. Vector Engineering, Inc. • 143E Spring Hill Drive •Grass Valley, CA 95945 •(530)272-2448 -26-