Section 375.204  Phase III – Detailed Water Quality Evaluation

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.