Phase III – Detailed Water Quality Evaluation

Section 375 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 BOD 5 , 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.