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In the United States, pre-approval for dispersant use exists only in conservatively defined circumstances of water depth and/or distance off shore. Historical records suggest that most opportunities for dispersant use will occur closer to shore and in shallower water than defined in existing pre-approval areas. The issue is to determine when it is appropriate to relax these standards in order to protect sensitive nearshore habitats, despite the potential for increased ecological effects in the water column. This paper reviews selected data in the context of Ecological Risk Assessment (ERA) protocols. In some cases onshore impacts are clearly decreased by dispersant use without adversely affecting the water column. This is especially true for small- or moderate-sized spills, often not viewed as a high priority for dispersant use. In other cases, however, trade-off decisions must be made, and when the ERA approach is properly integrated into oil spill response process, it can improve the likelihood of proper use of dispersants, and assist in the identification of appropriate dispersant response capabilities.

Using Laboratory, Mesocosm, and Field Data In Ecological Risk Assessments for Nearshore Dispersant Use