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Mount Baldy Wilderness

Home > PSD Limits > Map, List > Mount Baldy Wilderness

General Information

Image of Mount Baldy Wilderness

State(s): Arizona

County(s): Apache

Forest Service Administrative Unit(s):
Southwest Region (Region 3) -- Apache-Sitgreaves National Forest

Size: 7079 acres

Elevation Range: 9,210 - 11,400 feet

Data:

Documents

Resource Concern Thresholds

AQRV Type: VISIBILITY
Sensitive Receptor Sensitive Receptor Indicator Thresholds
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 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 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 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
Perennial Streams Acid Neutralizing Capacity For perennial streams that have a baseline Acid Neutralizing Capacity of 200-400 ueq/l, an ANC no lower than 200 ueq/l is acceptable.
Perennial Streams Acid Neutralizing Capacity For perennial streams that have a baseline Acid Neutralizing Capacity of <200 ueq/l, no decrease in ANC is acceptable.
Perennial Streams Acid Neutralizing Capacity For perennial streams that have a baseline Acid Neutralizing Capacity of 200-400 ueq/l, no more than a 10% decrease in ANC is acceptable.
Perennial Streams Aluminum, Extractable No more than an increase of 40 parts per billion in extractable aluminum is acceptable in perennial streams.
Perennial Streams Base Cations For perennial streams, the equivalence ration for base cations should be no lower than 1.
Perennial Streams Trace Metals For perennial streams that are in violation of state water quality standards for trace metal levels, no increase in trace metals is acceptable.
Perennial Streams pH For perennial streams that are in violation of state water quality standards for pH levels, no decrease in pH is acceptable.
Pollutant Exposure Concern Thresholds
Pollutant Exposures Level Name Thresholds
N EXCEEDANCE The Deposition Analysis Threshold for nitrogen deposition is 0.005 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 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: 9 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) 340 270 199 116 268 184
Haze Index (dv) 0.51 2.98 6.24 11.85 3.09 7.06
For more information on these numbers, click here.