Figure C1. Small-scale column test unit for capping effectiveness (Sturgis and Gunnison 1988)

Figure C1. Small-scale column test unit for capping effectiveness (Sturgis and

Gunnison 1988)

column. However, DO depletion can be used as a tracer for determining the

effectiveness of a cap in isolating an underlying contaminated dredged material

having an oxygen demand exceeding that of the capping material. A cap thick-

ness that is effective in preventing or reducing the diffusion of DO into the con-

taminated sediment will also prevent or reduce the diffusion of DO-demanding

species from the contaminated sediment into the overlying water column. Once

Appendix C Capping Effectiveness Tests