_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

b. Place a smooth insulating plate or fabric beneath hot welding apparatus after
usage.
• c. Use clean and dry welding rods or extrudate pellets.
d. Complete grinding process without damaging geomembrane according to
MANUFACTURER'S instructions no more than one (1) hour prior to
seaming operations.
e. Prevent exposed grinding mazks adjacent to an extrusion weld. Do not
extend exposed grinding marks more than one-quarter (1/4) inch from seam
area. CERTIFYING ENGINEER may request that any and all abraded
areas be covered with extrudate.
f Extrusion weld all cross seam tees to a minimum distance of four (4) inches
on each side of the tee.
g. For extrusion welds, the edge of the top sheet shall be beveled by grinding
the edge of [he sheet to approximately a 45 degree angle. Extrusion welds
can not be placed on previous extrusion welds.
C. Seaming Procedures
General Seaming Procedures
a. Areas to be seamed shall be cleaned and free of moisture, debris, or any
marking on the geomembrane.
• b. Use a flat board, a conveyor belt, or similar hard surface directly under the
seam overlap [o achieve proper support if required.
c. Cut fishmouths or wrinkles at the seam overlap along [he ridge of the
wrinkle in order to achieve a flat overlap. The cu[ fishmouths or wrinkles
shall be seamed and any portion where the overlap is inadequate shall then
be patched with an oval or round patch of the same geomembrane extending
a minimum of six (6) inches beyond the cut in all directions.
d. Extend seaming to the outside edge of panels placed in the anchor trench.
e. Do not field seam without the Seaming Supervisor present.
D. Field Trial Seams
Trial seams shall be conducted at the beginning of each seaming period and within
thirty (30) minutes of commencement of seaming, at the CERTIFYING
ENGINEER'S discretion, and immediately following any work stoppage (i.e., lunch,
weather conditions, etc.) of thirty (i0) minutes or more for each seaming apparatus
used that day. Each Seamer shall make at least one trial seam each day.
2. Testing shall include visual observation of a trial seam on the geomembrane material.
The INSTALLER will mark [he trial seam with date, ambient air temperature,
welding machine number, welding technician identification, and machine temperature
and speed. For extrusion welding, the INSTALLER will include the nozzle and
extrusion settings and welding technician identification. The remainder of trial seam
• should be cut in Iwo pieces; one [o be retained in CC&V's archive; and one to be
retained by the INSTALLER.
Section 02776 Page 15 of 20 October 25, 2000
Geomembrane GOldef A$$oclate$ Revision 8
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