Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 303 - WATER USE DESIGNATIONS AND SITE-SPECIFIC WATER QUALITY STANDARDS
Subpart C - SPECIFIC USE DESIGNATIONS AND SITE SPECIFIC WATER QUALITY STANDARDS
Section 303.410 - Chronic Nickel Water Quality Standard for Segment of the Sangamon River

The general use chronic water quality standard for dissolved nickel contained in 35 Ill. Adm. Code 302.208(e) does not apply to the segment of the Sangamon River that receives discharges from the Sanitary District of Decatur's Main Sewage Treatment Plant, from that facility's Outfall 001 located at 39° 49' 56" North Latitude, 89° 0' 7" West Longitude, to the point of the confluence of the Sangamon River with the South Fork of the Sangamon River near Riverton. Instead, waters in this segment of the Sangamon River must meet a chronic water quality standard for dissolved nickel as follows:

Chronic Dissolved Nickel Standard (µg/L) = exp[A+Bln(H)] x 0.997 * x WER

where:

A = -2.286,

B = 0.8460,

ln(H) = natural logarithm of Hardness, and

WER (Water Effect Ratio) = 2.50.

*conversion factor multiplier for dissolved metals