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	USDA Forest Service 1400 Independence Avenue SW Washington, D.C. 20250-0003 (202) 205-8333

Rainbow Lake Wilderness

General Information

State(s): Wisconsin

County(s): Bayfield

Forest Service Administrative Unit(s):
Eastern Region (Region 9) -- Chequamegon-Nicolet National Forest

Size: 6583 acres

Elevation Range: 1,100 - 1,325 feet

Data:

Documents

AQRV Type: WATER
Sensitive Receptor	Sensitive Receptor Indicator	Thresholds
Aquatic Organisms	Chemistry	Total sulfur plus 20% of nitrogen deposition at levels exceeding 9.0 kg/ha-yr may cause ANC loss that would impact aquatic organisms. Levels below 4.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
Aquatic Organisms	Chemistry	Sulfur deposition may significantly impact aquatic organisms at levels above 7.5 kg/ha/yr. Levels below 3.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
Perennial Lakes and Streams	Chronic Acid Neutralizing Capacity	To maintain healthy biological functioning in perennial lakes and streams, the chronic acid neutralizing capacity must be >= 25 ueq/l. ANC's below 10 ueq/L (the red line) are expected to cause adverse effects.
Perennial Lakes and Streams	Episodic Acid Neutralizing Capacity	To maintain healthy biological functioning in perennial lakes and streams, the episodic acid neutralizing capacity must be >= 0 ueq/l.
Perennial Lakes and Streams	Metals (Hg) Concentration	In perennial lakes and streams, the concern threshold for mercury in fish tissue is .05 parts per million mercury in wet weight, skin-on filet.

Pollutant Exposure Concern Thresholds

Pollutant Exposures	Level Name	Thresholds
N	EXCEEDANCE	The Deposition Analysis Threshold for nitrogen deposition is 0.010 kg/ha/yr. Below this, estimated impacts from a source greater than 50km from a FLM Class I Area are considered negligible.
Q	QOverD	For new or modified sources locating greater than 50 km from a Class I area, its impacts will be considered negligible with respect to Class I AQRVs if its total SO2, NOx, PM25, PM10, and H2SO4 annual emissions in tons/yr, based on 24-hr maximum allowable emissions, divided by the distance (km ) from the Class I area (Q/D) is 10 or less. For sources operating less than a year, the emissions must be adjusted to reflect what the emissions would be if the source operated year-round.
S	DEPOSITION	Sulfur deposition may significantly impact aquatic organisms at levels above 7.5 kg/ha/yr. Levels below 3.5 kg/ha-yr are not expected to significantly impact aquatic organisms.
S	EXCEEDANCE	The Deposition Analysis Threshold for sulfur deposition is 0.01 kg/ha/yr. Below this, estimated impacts from a source greater than 50km from a FLM Class I Area are considered negligible.
S20PctN	DEPOSITION	Total sulfur plus 20% of nitrogen deposition at levels exceeding 9.0 kg/ha-yr may cause ANC loss that would impact aquatic organisms. Levels below 4.5 kg/ha-yr are not expected to significantly impact aquatic organisms.

Site Specific Rayleigh scattering coefficient:	Clearest 20% Natural	Clearest 20% 2000-2004 Baseline	Haziest 20% Natural	Haziest 20% 2000-2004 Baseline	Average Annual Natural	Annual Average 2000-2004 Baseline
Standard Visual Range (km)
Haze Index (dv)
For more information on these numbers, click here.