35 Ill. Adm. Code 373.303
Smaller Facilities
Section 373
Section 373.303 Smaller
Facilities
a) Facilities which meet the following conditions need not
perform the analysis required by Section 373.304:
1) The facility must be designed for a waste load less than 750
P.E., and
2) The critical length of stream below the discharge is not
subject to significant sediment oxygen demand from bottom deposits as described
in Section 373.302(d).
b) After review of the application for smaller facilities the
Agency shall require further stream study if warranted by local conditions
including:
1) the impact of other dischargers on the stream,
2) the stream use designation or stream segment classification,
or
3) other characteristics that would limit the assimilative
capacity of the stream.