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General Information
State(s): New Mexico
County(s): Mora, Rio Arriba, San Miguel, Santa Fe, Taos
Forest Service Administrative Unit(s): Southwest Region (Region 3) -- Carson National Forest, Santa Fe National Forest
Size: 223333 acres
Elevation Range: 8,000 - 13,103 feet
Data:
Documents
Resource Concern Thresholds
AQRV Type: VISIBILITY |
Sensitive Receptor |
Sensitive Receptor Indicator |
Thresholds |
Natural Visibilty |
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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. |
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AQRV Type: WATER |
Sensitive Receptor |
Sensitive Receptor Indicator |
Thresholds |
Perennial Waters |
Acid Neutralizing Capacity |
For perennial waters that have a baseline Acid Neutralizing Capacity of <200 ueq/l, no decrease in ANC is acceptable. |
Perennial Waters |
Acid Neutralizing Capacity |
For perennial waters that have a baseline Acid Neutralizing Capacity of 200-400 ueq/l, an ANC no lower than 200 ueq/l is acceptable. |
Perennial Waters |
Acid Neutralizing Capacity |
For perennial waters that have a baseline Acid Neutralizing Capacity of 200-400 ueq/l, no more than a 10% decrease in ANC is acceptable. |
Perennial Waters |
Base Cations |
No decrease in the base cations of perennial waters is acceptable. |
Perennial Waters |
Conductivity |
No change in the conductivity of perennial waters is acceptable. |
Perennial Waters |
Trace Metals |
No increase in trace metals found in perennial waters is acceptable. |
Perennial Waters |
pH |
For perennial waters that have a baseline pH of 6.6-7.0, no more than a 0.1 decrease in pH is acceptable. |
Perennial Waters |
pH |
For perennial waters that have a baseline pH of >7.0, no more than a 0.5 decrease in pH is acceptable. |
Perennial Waters |
pH |
For perennial waters that have a baseline pH of <6.6, 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: 8 |
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) |
342 |
294 |
192 |
129 |
267 |
199 |
Haze Index (dv) |
-0.57 |
1.22 |
6.08 |
10.41 |
2.34 |
5.67 |
For more information on these numbers, click here. |
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