• Potential leachat incompatibility.
• Anticipated hydraulic gradients and maximum allowable permeability in the completed
control feature.
• Depth, permeability, continuity, and hardness of the aquiclude.
• Wall placement relative to sediment and leachates.
• Cost and time considerations.
Each of these items is summarized in Table 1. Once determined necessary, design of such
systems usually involves either a performance type specification or a materials and methods
specification for contract execution. Table 2 summarizes various technologies for barrier wall
emplacement. The following paragraphs provide additional design guidance specific to the
particular control measure employed.