On March 19, 2015, the Board adopted a second notice opinion and order for proposed water quality standards for the Chicago Area Waterway System (CAWS) and Lower Des Plaines River (LDPR) that are necessary to meet the aquatic life uses for those waterways. The proposal is docketed as In the Matter of: Water Quality Standards and Effluent Limitations for the Chicago Area Waterway system and Lower Des Plaines River: Proposed Amendments to 35 Ill. Adm. Code 301, 302, 303, and 304, R08-9(D).
Board Proposes Water Quality Standards in the Chicago Area Waterways System and
Lower Des Plaines River Subdocket DOn March 19, 2015, the Board adopted a second notice opinion and order for proposed waterquality standards for the Chicago Area Waterway System (CAWS) and Lower Des Plaines River(LDPR) that are necessary to meet the aquatic life uses for those waterways.
However, the Board is delaying the effective date of the 500 mg/L chloride standard for
waters other than the Chicago Sanitary and Ship Canal (CSSC) for three years.
The Board proposed that the CSSC will have a sitespecific
numeric standard for chloride of 620 mg/L as an acute water quality standards and 990mg/L as ...
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