2013-10-01_REVISION - M1980244

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 10/1/2013
• Doc Name: Response to Adequacy
• From: CC&V
• To: DRMS
• Type & Sequence: TR68
• Email Name: TC1
• Media Type: D
• Archive: No

TECHNICAL SPECIFICATIONS
2.2 SEAMING AND TESTING EQUIPMENT
A. Seaming
1. Approved field seaming processes are hot shoe double fusion welding and extrusion welding,
when approved by CERTIFYING ENGINEER. Use double fusion welding as primary method
of seaming adjacent field panels.
2. CONTRACTOR shall maintain on -site a minimum of two spare operable seaming apparatuses.
3. Seaming equipment shall not damage the geomembrane.
4. CONTRACTOR may use a hot air device ( "Leister ") to temporarily bond geomembrane panels
that are to be extrusion welded.
5. CONTRACTOR shall use extrusion welding apparatus equipped with gauges giving temperature
of preheat and extrudate at nozzle of apparatus.
6. Welding rods or beads used for extrusion welding shall have the same physical properties as that
used for the resin used in the manufacture of the type of geomembrane that is being installed at the
PSES Pipe Rack Liner Extension Project.
7. CONTRACTOR shall use fusion welding apparatus which are self - propelled devices equipped
with a gauge indicating temperature of heating element, and a gauge indicating the speed of the
welding apparatus.
B. Vacuum testing (for extrusion seam only) the equipment shall consist of the following:
1. Vacuum box assembly consisting of: rigid housing, transparent viewing window, soft neoprene
gasket attached to bottom of housing or porthole and valve assembly, and vacuum gauge.
2. Pump assembly equipped with pressure controller and pipe connections.
3. Rubber pressure /vacuum hose with fittings and connections.
4. Bucket of soapy solution.
5. Wide paint brush, or other means of applying soapy solution.
C. Air pressure testing (for double fusion seam only) the equipment shall consist of the following:
1. Air pump (manual or motor driven), equipped with a pressure gauge, capable of generating,
sustaining, and measuring pressure between 25 and 30 psi and mounted on a cushion to protect
geomembrane.
2. Rubber hose with fittings and connections.
3. Sharp hollow needle, or other approved pressure feed device.
4. An air pressure- monitoring device.
PART 3 - EXECUTION
U41A11INIM\135
A. CONTRACTOR, on a daily basis, shall certify in writing that the surface on which the geomembrane
will be installed is acceptable. It will be the CONTRACTOR'S responsibility to maintain, protect, and
if required return, the subgrade in the condition that was originally accepted, prior to geosynthetic
deployment until accepted by CC &V, under criteria identified in Section 02200 as per the
SPECIFICATIONS.
Geomembrane August 28, 2013
02776.1 -8 Revision 0
S \Projects \1550 - CC &V Field Spt CQA PSES Bldg \8 0 Project Engineering and Design \8 2 Specfications\PSES Pipe Rack Liner Extension Specifications \02776 1 Geomembrane docx