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Vantage to Pomona Heights Chapter 4
<br />230 kV Transmission Line Project FEIS Environmental Consequences
<br /> PAGE 4-126
<br />TABLE 4.3-10 SUMMARY OF IMPACTS TO SAGE-GROUSE BY ACTION ALTERNATIVE
<br />ACTION ALTERNATIVES MILES WITHIN PAC DISTURBANCE TO SAGE-GROUSE HABITAT (ACRES)1
<br />ESTIMATED NUMBER OF NEW TRANSMISSION LINE
<br />STRUCTURES
<br />SAGE-GROUSE POPULATION RANGE ACTIVE OR INACTIVE LEKS (NUMBER) PHS HISTORIC LEKS (NUMBER)
<br />OVERALL IMPACT LEVELS
<br />(MILES)2 Suitable Marginal Unsuitable Total Disturbance Total Disturbance Within the PAC Total
<br />Number of New
<br />Structures
<br />Total Number of New Structures
<br />Greater Than 0.25 Mile From An
<br />Existing
<br />Transmission Line
<br />Miles of Centerline Within
<br />Sage-Grouse Population Range
<br />Acres of Population Range
<br />Within 4 Miles Within 0-0.6 Mile Within 0-2 Miles Within 0-3 Miles Within 0-4 Miles (SDEIS Only) Wi Thin 0-0.6 Mile Within 0-2 Miles Within 0-3 Miles Within 0-4 Miles (SDEIS Only) High Moderate Low 80% Core Population Range
<br />95% Population Range
<br />80% Core Population Range
<br />95% Population Range
<br />Alternative A
<br />1a, 1b, 2a, 2b, 2d, 3a, 3c
<br />64.7 miles
<br />41.5 187.7 94.7 54.5 336.9 225.0 482 391 10.2 25.1 51,534 100,284 0 2 3 4 0 8 9 15 0 45.9 18.8
<br />Alternative B
<br />1a, 1b, 2a, 2b, 2d, 3a, 3b
<br />61.2 miles
<br />56.7 162.0 74.0 87.0 323.0 299.0 477 432 10.2 25.1 56,807 109,563 0 2 3 5 0 10 13 21 0 39.4 21.8
<br />Alternative C
<br />1a, 1b, 2a, 2c, 2d, 3a, 3b
<br />63.0 miles
<br />58.5 119.2 84.0 113.2 316.4 292.4 485 376 7.9 22.1 44,737 95,824 0 1 3 5 0 7 12 21 0 36.1 26.9
<br />Alternative D
<br />1a, 1b, 2a, 2c, 2d, 3a, 3c
<br />66.5 miles
<br />43.3 144.9 104.8 80.7 330.3 218.4 490 335 7.9 22.1 39,304 86,385 0 1 3 4 0 5 8 15 0 42.6 23.9
<br />Alternative E
<br />1a, 1c, 2a, 2b, 2d, 3a, 3b
<br />61.6 miles
<br />57.1 151.2 97.9 86.9 336.0 311.9 480 435 9.7 25.4 56,386 108,886 0 2 2 5 0 10 13 21 0 38.4 23.2
<br />Alternative F
<br />1a, 1c, 2a, 2b, 2d, 3a, 3c
<br />65.1 miles
<br />41.9 176.9 118.6 54.3 349.9 238.0 485 394 9.7 25.4 51,113 99,607 0 2 2 4 0 8 9 15 0 44.9 20.2
<br />Alternative G
<br />1a, 1c, 2a, 2c, 2d, 3a, 3b
<br />63.4 miles
<br />58.9 108.4 107.9 113.1 329.4 305.4 488 379 7.4 22.4 44,286 95,117 0 1 2 5 0 7 12 21 0 35.1 28.3
<br />Alternative H
<br />1a, 1c, 2a, 2c, 2d, 3a, 3c
<br />66.8 miles
<br />43.7 134.2 128.7 80.5 343.3 231.4 493 338 7.4 22.4 38,852 85,677 0 1 2 4 0 5 8 15 0 41.6 25.2
<br />NNR Alternative - Overhead Design Option*
<br />NNR-1, NNR-2, NNR-3, NNR-4o, NNR-5, NNR-
<br />6o, NNR-7, NNR-8
<br />40.5 miles
<br />38.7 144.0 48.1 11.8 204.0 193.3 328 50 0 0 0 15,424 0 0 0 2 2 5 7 10 0 23.9 16.6
<br />NNR Alternative - Underground Design Option
<br />NNR-1, NNR-2, NNR-3, NNR-4u, NNR-5, NNR-
<br />6u, NNR-7, NNR-8
<br />40.5 miles
<br />38.7 180.2 62.5 11.8 254.5 243.9 383 50 0 0 0 15,424 0 0 0 2 2 5 7 10 0 23.9 16.6
<br />NNR Alternative MR Subroute
<br />NNR-1, NNR-2, NNR-3, NNR-5, NNR-6o, NNR-
<br />7, NNR-8, MR-1
<br />47.8 miles
<br />46 161.3 68.5 30.3 260.2 249.5 383 135 0 0 0 15,264 0 0 0 2 1 4 7 10 0 24.3 23.5
<br />1 Habitat Suitability is derived from land cover types. Land cover types are a composite of GAP vegetation data, JBLM YTC vegetation data, and POWER field survey vegetation data. Suitable habitat includes sagebrush/perennial grassland. Marginal habitat includes sagebrush/annual grassland, riparian, intermittent stream, and
<br />bitterbrush/perennial grassland. Unsuitable habitat includes forb, perennial grassland, rabbitbrush/annual grassland, annual grassland and noxious weeds, basalt cliffs/rock, trees, and other (includes agriculture, developed/residential areas and open water).
<br />2 Impact levels are presented in linear miles. Impacts may be reduced further through site specific engineering and design in conjunction with mitigation.
<br />* Agency Preferred Alternative
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