Composite mortality tables means mortality tables with rates of mortality that do not distinguish between smokers and nonsmokers.
Semi-annual (2/Year) sampling frequency means the sampling shall be done during the months of June and December, unless specifically identified otherwise.
Water table means the upper surface of a zone of saturation, where the body of ground water is not confined by an overlying impermeable zone.
Yearly (1/Year) sampling frequency means the sampling shall be done in the month of September, unless specifically identified otherwise in the effluent limitations and monitoring requirements table.
Nominal tomographic section thickness means the full width at half-maximum of the sensitivity profile taken at the center of the cross-sectional volume over which x-ray transmission data are collected.