Stacking GCL rolls

Q: I have a question regarding the storage and handling of geosynthetic clay liner (GCL) rolls. The manufacturer allows stacking up to five GCL rolls. Is this okay?

A: The answer depends on the subgrade under the stacked GCL rolls and the equipment you are using to handle the rolls. In a manufacturing plant, with a stinger on a concrete floor, you could possibly stack nine GCL rolls high. In the field on a smooth, prepared, firm subgrade that cannot be inundated with water, using a lull or forklift with slings to lift the rolls, I would recommend no greater than three to four stacked GCL rolls. There is some guidance in this regard in Daniel and Koerner (1993).

Daniel, D. E., and Koerner, R. M. (1993). “U.S. EPA technical guidance document: Quality assurance and quality control for waste containment facilities.” EPA/600/R93/182. U.S. Environmental Protection Agency, Office of Research and Development, Washington, D.C.