There is a risk that wastewater or fats and oils will
flow out, via a rainwater channel, into areas outside
of corporate premises. Therefore, [1] that portion of
the rainwater channel which ranges from the final
water discharge point to a spot 100 m away
therefrom shall be regarded as an environmental
risk range regarding water quality. However,
[2] it shall be assumed that there is no risk that
wastewater or fats and oils will flow out directly into
areas outside of corporate premises.