| (a) An ultraviolet light (UV) system must be sized
based upon the results of an independent bioassay that meets the following
minimum criteria.
(1) The lamp and ballast in a bioassay test system
must have the same spectral characteristics and 254 nanometers (nm)
wavelength output as the full-scale system.
(2) Spacing of the lamps in a bioassay test unit must
be the same as in the full-scale system.
(3) The arrangement of the lamps must mirror the full-scale
system.
(4) The maximum scale-up factor is 10.
(5) Scale down is prohibited.
(6) The minimum number of lamps in a bioassay is four
lamps per reactor.
(b) If a variable output lamp is used, detailed documentation
from the lamp manufacturer must be provided to document 254 nm ultraviolet
output, operational wattage versus lamp input power (voltage and current),
along with data demonstrating power requirements to the lamp and ballast
to achieve the stated output.
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