This field manual is intended for use by responders at an oil spill. It is a collection of "Rules of Thumb" and checklist that provide quick access to the information needed when formulating response strategies. The manual is neither an all-inclusive textbook nor a substitute for training, qualified tecnickal advice or common sense. it addresses response to oil spills that could reach water. Spills on land and chemical spills are not covered. Legal issues and environmental regulations are likewise outside the scope of this manual.