Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 375 - COMBINED SEWER OVERFLOW EXCEPTION CRITERIA AND FIRST FLUSH DETERMINATION
Subpart B - WATER QUALITY INVESTIGATION
Section 375.204 - Phase III - Detailed Water Quality Evaluation

Universal Citation: 35 IL Admin Code ยง 375.204

Current through Register Vol. 48, No. 38, September 20, 2024

Areas to be addressed in a detailed water quality survey shall include, consistent with 35 Ill. Adm. Code 306.361(d):

a) water column chemistry -

1) upstream/downstream and overflow sampling;

2) wet weather/dry weather sampling;

3) diurnal sampling for dissolved oxygen (D.O.);

4) parameters generally will include BOD5, suspended solids, volatile suspended solids, ammonia. Other parameters may become important depending on the nature of the overflow; and

5) other parameters as deemed appropriate relative to 35 Ill. Adm. Code 375.302(a)(8).

b) sediment analysis -

1) sediment oxygen demand;

2) percent volatile matter;

3) particle size distribution; and

4) other parameters as deemed appropriate relative to 35 Ill. Adm. Code 375.302(a)(8).

c) biological survey -

1) benthic macroinvertebrates;

2) fishes; and

3) plant productivity assessment (algal blooms).

d) hydraulic and hydrologic factors including storm hydrographs for receiving stream and overflow.

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