The Use of Chemical Countermeasures Product Data for Oil Spill Planning and Response, Volumes I and II Addresses many of the issues related to potential uses of chemical countermeasure products in mitigating the environmental impacts of spilled oil. Volume I summarizes workshop deliberations and presents consensus recommendations from the sessions on en vironmental effects, effectiveness, and decision making. Volume II cont ains 13 background papers for workshop participants on various scie ntific and operational topics, e.g. aquatic toxicity, oil weathering, and decision making