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Determine the hazardous materials present.
One way of describing a "hazardous materials incident" would be "an accident where hazardous materials are present." However, many people are uncomfortable with the use of the word "accident" which implies an unplanned event that could not have been avoided. That is why the word "incident" is used in the first place. It does not carry any implication of inevitability.
The risks of hazardous materials, and the appropriate controls for those risks, depend on the nature of the hazardous material, how much is present, and the environment in which it is present. It is not possible to be more specific with such a general question. Encyclopedias have been written on this subject.
For a hazardous materials "safety zone," the location should be upwind or uphill and same level
determine the hazardous materials present
How you should deal with hazardous materials depends on what they are and what you need to do with them. It is not possible or answer more specifically unless the particular materials and processes are known. Nonhazardous materials still should be handled with care to prevent physical injury from lifting them improperly, from being cut by them, tripping over them, etc., etc.
Aluminum ingots are hazardous because they are heavy and could injure you if they dropped on your foot or leg. Other than that, they present no particular hazard once they have cooled.
A Hazardous Waste is any material that is subject to the EPA's Hazardous Waste Manifest specified in 40CFR262. A Hazardous Substance - is any material listed as having Reportable Quantities Pursuant to Section 311 of the Clean Water Act (40CFR117.3) A Hazardous Material is any material or object that meets the any of the definitions of Hazard Classes in 49 CFR or that is listed in the Hazardous Materials Table at 49CFR172.101
In the production of solar power, hazardous substances like lead and cadmium are present in some types of solar panels. In nuclear power production, radioactive materials such as uranium and plutonium are used, which can be hazardous if not properly managed.
A hazardous material is a hazardous material because of its physical or chemical properties, not because of the amount that may be present. Smaller quantities, however, may be considered to be insignificant, but the amount depends on the particular material.
Optical drives are drives such as CD readers and writers. Although the CDs are made using some materials that are hazardous, the finished product is not hazardous. The drives themselves incorporate lasers, which are used to read the CD, or write to it. These are fully enclosed and do not present a hazard to the user. However, if one were to disassemble such a drive and then power the laser it is possible that the laser beam could be hazardous under limited circumstances. But the the drive would not work to read or write CDs, and would effectively have been destroyed.
This is mercury (Hg).