Screening Evaluations for Upland Confined Disposal Facility Surface Runoff Quality
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
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Section 404 of the Clean Water Act requires evaluation of the potential impacts of dredged material discharges from confined disposal facilities CDFs. A joint U.S. Army Corps of Engineers USACE and U.S. Environmental Protection Agency EPA Technical Framework USEPAUSACE 2004 provides guidance for evaluation of potential contaminant pathways to determine if controls or management actions are required. Guidance for implementation of the Technical Framework is provided in the USACE Upland Testing Manual UTM USACE 2003. The UTM provides a tiered approach for performing pathway evaluations. Tier II of the UTM contains a screening methodology to determine the need for pathway testing. The screens compare screening criteria, such as water quality standards, with predictions based on bulk sediment chemistry and partitioningbioavailability relationships. One potential pathway of contaminant release from CDFs is surface runoff water discharged after CDF filling operations have been completed. The simplified laboratory runoff procedure SLRP and runoff simulatorlysimeter system RSLS tests are available to predict chemical releases in surface runoff for comparison to water quality criteria, and water column bioassays are available to determine potential toxicity of surface runoff USACE 2003. This technical note provides procedures for evaluating CDF surface runoff quality at the screening level of a multi-tiered approach. The screening evaluation is based on equilibrium partitioning principles Hill et al. 1988 and conservative application of design and operating principles for CDFs.
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