The high frequency range consist of two filters – a peaking filter with adjustable band width (usually set to Boost) and a shelf filter (usually set to Attenuate).
Attenuation block means a block or stack, having dimensions 20 centimeters by 20 centimeters by 3.8 centimeters, of type 1100 aluminum alloy or other materials having equivalent attenuation.
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.
Disinfect means to eliminate virtually all germs from inanimate surfaces through the use of chemicals or physical agents (e.g., heat). In the child care environment, a solution of ¼ cup household liquid chlorine bleach added to one gallon of water (or one tablespoon bleach to one quart of water) and prepared fresh daily is an effective disinfectant for environmental surfaces and other objects. A weaker solution of 1 tablespoon bleach to 1 gallon of cool water is effective for use on toys, eating utensils, etc. Commercial products may also be used.
Stroke means a cerebrovascular accident or infarction (death) of brain tissue, as diagnosed by a Physician, which is caused by hemorrhage, embolism, or thrombosis producing measurable, neurological deficit persisting for at least one hundred eighty (180) days following the occurrence of the Stroke. Stroke does not include Transient Ischemic Attack (TIA) or other cerebral vascular events.
Nematode means invertebrate animals of the phylum nemathelminthes, and class nematoda, i.e., unsegmented round worms with elongated, fusiform, or saclike bodies covered with cuticle, and inhabiting soil, water, plants, or plant parts, may also be called nemas or eelworms.