_REVISION - M1980244 ‎(30)‎

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Name: Appendix E
• From: Cripple Creek & Victor Gold
• To: DMG
• Type & Sequence: AM8
• Media Type: D
• Archive: No

MANAGER and CERTIFYING ENGINEER may require CONTRACTOR to test up to as much as
twenty percent (20%) of factory fusion welds (non-destructive air pressure test) in the field to verify
factory test results. Additional testing at CONTRACTOR'S expense will be required if failed tests aze
obtained in the field.
3.07 FIELD SEAMS:
A. Seam Layout
Seams shall be oriented parallel to the line of maximum slope, i.e., oriented down,
not across the slope. In corners and odd-shaped geometric tocations, the number of
field seams shall be minimized.
2. No horizontal or base T-seam or tie-in seams shall be closer than five (5) feet from
the toe of the slope. Seams shall be aligned to prevent wrinkles and "fishmouths". [f
a 5shmouth or wrinkle is found, it shall be relieved and capped.
3. Panels of geomembrane will have sufficient overlap provided to allow peel tests to be
performed on the seam.
B. Seaming Method
The procedure used to temporarily bond adjacent panels together shall not damage
the geomembrane; in particular, the temperature of hot air at the nozzle of any spot
welding appazatus shall be controlled such that the geomembrane is not damaged.
2. CONTRACTOR shall use double fusion welding as primary method of seaming
adjacent field panels.
• a. For cross seam tees associated with fusion welding, CONTRACTOR shall
patch panel intersections consisting of 3 or more panels and extrusion weld
to a minimum distance of 4 inches on each side of patch. The edge of the
sheet shall be ground to a 45° angle prior to welding.
b. Place a protective layer, e.g., insulting plate or fabric, beneath hot welding
apparatus after usage.
c. When subgrade conditions dictate, use a moveable protective layer directly
below each overlap of geomembrane that is to be seamed to prevent buildup
of moisture between sheets and prevent debris from collecting around
pressure rollers.
d. Remove seaming sheets and excess geomembrane trimmed to provide
required overlap.
3. Use conventional extrusion welding as a secondary method for seaming between
adjacent panels and as a primary method of welding for detail and repair work.
a. Purge heat-degraded extrudate from barrel of extruder under the following
conditions:
Prior to beginning a seam.
2. Whenever extruder has been inactive.
Section 02776 Page 14 of 20 October 25, 2000
Geomembrane Golder Associates Revision 8
D9PHASEw PSSA CERTe1PPENDICIE541PPENDIX E TECHNICAL SPECIFICATIONS\99)-l°9902]161RB.DOC