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San Gorgonio Wilderness


General Information

Image of San Gorgonio Wilderness

State(s): California

County(s): Riverside, San Bernardino

Forest Service Administrative Unit(s):
Pacific Southwest Region (Region 5) -- San Bernardino National Forest

Size: 94664 acres

Elevation Range: 3,116 - 10,911 feet

Image(s): http://www.wilderness.net/images/

Detailed wilderness information: http://www.wilderness.net

GIS Map/Official Boundary: http://www.wilderness.net/NWPS/

Webcam(s): San Gorgonio (Gallery)

Data:

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Documents

Resource Concern Thresholds

AQRV Type: VISIBILITY
Sensitive Receptor Sensitive Receptor Indicator Thresholds
Natural Visibilty In specific Class I areas to maintain consistency with Regional Haze implementation plans or BART, the visibility threshold for concern is not exceeded if the 98th %ile change in light extinction is <5% for each year modeled, when compared to the 20% best natural background values.
Natural Visibilty For sources generally further than 50 km from a Class I area, the visibility threshold for concern is not exceeded if the 98th %ile change in light extinction is <5% for each year modeled, when compared to the annual average natural condition value for that Class I area.
Plume Blight Absolute Contrast For near field sources (within 50 km of a Class I area), no additional analysis will be requested If screening analysis of a new or modified source can demonstrate that its emissions will not cause a plume with hourly estimates of DeltaE (color difference index) greater than or equal to 2.0 or the absolute value of the contrast greater than or equal to 0.05 when modeled against natural conditions.
Plume Blight Absolute Contrast Higher level near-field screening and refined analysis: no further analysis will likely be requested if a new or modified source can show that impacts from a new or modified source will stay with the threshold of DeltaE <1.0 and |C| <0.02 modeled against natural conditions.
Plume Blight Color Difference Index Plume blight near-field refined analysis: no further analysis will likely be requested if a new or modified source can show that impacts from a new or modified source will stay with the threshold of DeltaE <1.0 and |C| <0.02 when modeled against natural conditions.
Plume Blight Color Difference Index For near field sources (within 50 km of a Class I area), no additional analysis will be requested If screening analysis of a new or modified source can demonstrate that its emissions will not cause a plume with hourly estimates of DeltaE (color difference index) greater than or equal to 2.0 or the absolute value of the contrast greater than or equal to 0.05 when modeled against natural conditions.

AQRV Type: WATER
Sensitive Receptor Sensitive Receptor Indicator Thresholds
Lakes with Low Anc Acid Neutralizing Capacity For lakes with low acid neutralizing capacity, a long-term reduction of ANC of less than 10 ueq/l results in the condition class "No Change".
Lakes with Low Anc Acid Neutralizing Capacity For lakes with low acid neutralizing capacity, a long-term reduction of ANC of 5-10 ueq/l results in the condition class "Significant".
Lakes with Low Anc Acid Neutralizing Capacity For lakes with low acid neutralizing capacity, a reduction of ANC to near 0 ueq/l during and immediately following hydrologic events results in the condition class "Severe".
Perennial Streams Acid Neutralizing Capacity For perennial streams with low acid neutralizing capacity, a long-term reduction of ANC of 5-10 ueq/l results in the condition class "Significant".
Perennial Streams Acid Neutralizing Capacity For perennial streams with low acid neutralizing capacity, a long-term reduction of ANC of less than 10 ueq/l results in the condition class "No Change".
Perennial Streams Acid Neutralizing Capacity For perennial streams with low acid neutralizing capacity, a reduction of ANC to near 0 ueq/l during and immediately following hydrologic events results in the condition class "Severe".
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, 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 EXCEEDANCE The Deposition Analysis Threshold for sulfur deposition is 0.005 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: 10 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) 346 228 188 43 257 92
Haze Index (dv) 1.23 5.4 7.3 22.17 4.2 14.44
For more information on these numbers, click here.