- (a) Handling. The FML must be handled to avoid bridging or stressed conditions in the material.
- (b) Slack allowance. Slack allowance shall be provided to allow for shrinkage during installation.
- (c) Placement. The FML shall be installed in direct and uniform contact with the reconstructed clay liner.
- (d) Temperature. The FML shall be seamed only when the ambient air temperature is between 40o F and 104o F, unless pre-construction weld tests for the seaming demonstrate adequate results at other temperatures.
- (e) Wind and rain. The FML shall not be installed when there is excessive moisture or wind.
- (f) Overlap. Panels shall have a minimum four-inch finished seam overlap, unless the manufacturer specifies a larger overlap.
- (g) Orientation of seams. Seams shall be oriented down the slope, not across it.
(h) Field seam restrictions. In corners and odd-shaped geometric locations, the number of field seams shall be minimized.
- (1) No base T-seam shall be closer than five feet to the toe of the slope.
- (2) Seams shall be aligned with the least possible number of wrinkles and fishmouths.
- (3) If a fishmouth is found, it shall be relieved and cap-stripped.
- (4) Field seaming must be performed by a hot shoe fusion welder, an extrusion welder, or an alternative method approved by the DEQ prior to use in the field.
- (i) Ancillary penetrations. Pipes, gas vents, manholes, sumps or other objects that may penetrate the liner must be connected to the liner material in a way that prevents leakage and unnecessary stresses.
Added at 20 Ok Reg 1151, eff 6-1-03