A large chemical plant had to be surveyed for asbestos. In a typical survey for asbestos in a building or a school, one would simply identify the suspect materials and note the location and condition and take samples of homogeneous areas to develop an asbestos survey and management plan. A chemical manufacturing plant is something quite different. A plant with a long history has gone through continuous development. The asbestos and non-asbestos materials in many cases are very similar in texture and color. We therefore, using the drawings and dates of the installation of the equipment and collected samples of each homogeneous area. Once the samples were analyzed, we went back and only assessed the materials that came back positive for asbestos.