| magnetrometry | A geophysical technology used to detect disruptions that metal objects cause in the earth's localized magnetic field. |
| mass spectroscopy | An analytical process to determine the relative atomic masses of atoms. A sample is ionized and passed through an electromagnetic field. Different ions can be identified by characteristic patterns. It is often used in conjunction with gas chromatography. |
| MCL | Maximum Contaminant Level, established by the Safe Drinking Water Act. |
| medium | A specific environment--air, water, or soil- which is the subject of regulatory concern and activities. |
| methane | A flammable gas created by anaerobic decomposition of organic compounds. |
| mg/kg | Milligram per kilogram. One mg/kg equals to one part per million. |
| mg/L | Milligrams per Liter. One mg/L is loosely equivalent to one part per million. |
| microbes | A minute life form. |
| micrograms(ug)/kg | Micrograms per kilogram. One ug/kg equals to one part per billion. |
| micrograms(ug)/L | Micrograms per Liter. One ug/L is loosely equivalent to one part per billion. |
| migration pathway | A potential path or route of contaminants from the source of contamination to contact with human populations or the environment. |
| mixed waste | A low-level radioactive waste contaminated with hazardous waste. |
| monitoring well | A well drilled for the purpose of sampling groundwater to determine the characteristics of the water and the presence or absence of contaminants. |
| MTBE | Methyl Tertiary Butyl Ether. MTBE is used to add oxygen to gasoline. |
| mutagenic | An agent, as a radioactive element or ultraviolet light, that causes biological mutation. |
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