"The scope of this recommended practice includes the use of vacuum/pressure trucks@ skids@ portable tanks and trailers (herein referred to as vacuum trucks) to remove flammable and combustible liquids from tanks and equipment and to clean up liquid hydrocarbon spills. The scope includes movement of liquid mixtures (such as ""produced water""@ BSW or tank bottoms) that may contain sufficient hydrocarbon material to present comparable hazards. These safe practices also apply to the operation of portable vacuum tanks@ skids and trailers typically used in emergency flammable and combustible liquid spill cleanup activities. While not included in the specific scope of this standard@ Appendix F presents information related to pneumatic (air moving) trucks and hoppers@ typically used in the petroleum industry for removal of noncombustible dry materials such as catalysts@ dusts@ powders or@ residue."