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Bradwell Bay Wilderness |
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General Information
State(s): Florida
County(s): Wakulla
Forest Service Administrative Unit(s):
Southern Region (Region 8) -- National Forests in Florida
Size: 24602 acres
Elevation Range: 40 - 67 feet
Data:
Documents
Resource Concern Thresholds
| AQRV Type: WATER |
| Sensitive Receptor |
Sensitive Receptor Indicator |
Thresholds |
| Perennial Streams |
Acid Neutralizing Capacity |
In perennial streams, no more than .1 microequivalent/liter measurable decrease in acid neutralizaing capacity is acceptable |
| Perennial Streams |
Chronic Acid Neutralizing Capacity |
To maintain healthy biological functioning in perennial streams, the chronic acid neutralizing capacity must be >= 25 ueq/l. |
| Perennial Streams |
Chronic pH |
To maintain healthy biological functioning, the chronic pH of perennial streams must be >= 6.0. |
| Perennial Streams |
Episodic Acid Neutralizing Capacity |
To maintain healthy biological functioning in perennial streams, the episodic acid neutralizing capacity must be >= 0 ueq/l. |
| Perennial Streams |
Episodic pH |
To maintain healthy biological functioning, the episodic pH of perennial streams must be >= 5.5. |
| Perennial Streams |
pH |
In perennial streams, no more than .01 measurable decrease in pH is acceptable |
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. |
| N |
DEPOSITION |
Nitrogen deposition may be expected to cause cation leaching in soils when N levels are greater than 12 kg/ha/yr. Below 5 kg/ha/yr, negative effects to soil and vegetation are not expected |
| O3 |
W126 |
Biomass reduction of ozone sensitive species may occur when the W126 ozone metric (for April-September) is >= 14.5 ppm-hours. This should be evaluated in conjunction with the N100 value. |
| O3 |
N100 METRIC |
Biomass reduction of ozone sensitive species may occur when the number of hours from APRIL-SEPTEMBER with an ozone concentration greater than or equal to 0.100ppm equals or exceeds 4. This should be evaluated in conjunction with the W126 value. |
| 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 be expected to cause cation leaching and increased aluminum toxicity in soils when levels are greater than 20 kg/ha/yr. At 5 kg/ha/yr or below, sulfur negative effects to soil and vegetation are not expected. |
| 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. |
Natural Background Visibility
| 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) |
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| Haze Index (dv) |
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| For more information on these numbers, click here. |
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