Elementary neutralization unit means a device which:
Sterilization means the procedure that kills all microorganisms, including their spores.
Stability (7) means the standard deviation (1 sigma) of the variation of a particular parameter from its calibrated value measured under stable temperature conditions. This can be expressed as a function of time.
mineralization means the concentration of metals and their chemical compounds within a body of rock;
Natural attenuation means a variety of physical, chemical or biological processes that, under favorable conditions, act without hu- man intervention to reduce the mass, toxicity, mobility, volume, or concentration of hazardous substances in the environment. These in situ processes include: Natural biodegradation; dispersion; dilution; sorption; volatilization; and, chemical or biological stabilization, transformation, or destruction of hazardous substances. See WAC 173-340-370(7) for a description of the expected role of natural at- tenuation in site cleanup. A cleanup action that includes natural at- tenuation and conforms to the expectation in WAC 173-340-370(7) can be considered an active remedial measure.