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18
Wind
Direction
Fence
Configuration
Fence
Height
10 µm
Escape
(%)
10 µm
Reduction
(%)
50 µm
Escape
(%)
50 µm
Reduction
(%)
SW
No Fence
(Baseline)
—
94.7
—
87.7
—
SW
½-Wrap
80 ft
10
89.4
28
68.1
SW
½-Wrap
100 ft
55
41.9
26
70.4
SW
¾-Wrap
80 ft
26
72.5
29
66.9
SW
¾-Wrap
100 ft
29
69.4
26
70.4
SW
Full-Wrap
80 ft
62
34.5
28
68.1
SW
Full-Wrap
100 ft
65
31.3
29
66.9
SSE
No Fence
(Baseline)
—
99.1
—
89.6
—
SSE
½-Wrap
80 ft
38
61.7
13
85.5
SSE
½-Wrap
100 ft
43
56.6
12
86.6
SSE
¾-Wrap
80 ft
36
63.7
17
81.0
SSE
¾-Wrap
100 ft
39
60.6
17
81.0
SSE
Full-Wrap
80 ft
33
66.7
12
86.6
SSE
Full-Wrap
100 ft
33
66.7
12
86.6
WNW
No Fence
(Baseline)
—
99.2
—
95.4
—
WNW
½-Wrap
80 ft
50
49.6
44
53.9
WNW
½-Wrap
100 ft
80
19.4
42
55.9
WNW
¾-Wrap
80 ft
77
22.4
44
53.9
WNW
¾-Wrap
100 ft
82
17.3
50
47.6
WNW
Full-Wrap
80 ft
57
42.5
30
68.6
WNW
Full-Wrap
100 ft
75
24.4
26
72.7
— SW Wind Direction
direction at 15 mph to assess the behavior of the finest respirable dust fraction. PM2.5 particles are of
particular regulatory and health concern due to their ability to remain airborne for extended periods and
penetrate deep into the respiratory system. The table below summarizes the percentage of modeled
PM2.5 particles escaping the terminal boundary. Dispersion images for each SW scenario are provided in
Appendix F.
Wind Direction
Fence Configuration
Fence Height
SW
No Fence
—
96%
SW
¾-Wrap
80'
61%
SW
¾-Wrap
100'
61%
SSE / WNW
All configurations
—
Not modeled*
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