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Dispersion Model Results

QUEST Consultants

Release From Tanker

Hole Size

Atmospheric Conditions

Pasquill-Gifford* Atmospheric stability

Liquid Impoundment

Distance to Lower Flammability Limit (LFL)

5 meters

1.5m/s

5 meters

5 m/s

F

No

2.5 miles

D

No

0.6 miles

1 meter

1.5m/s

1 meter

5 m/s

F

No

2.3 miles

D

No

0.5 miles

  • *

    Stability D is characterized by fully overcast or partial cloud cover during both daytime and nighttime. The atmospheric

turbulence is not as great during D conditions as during A conditions; thus, the gas will not mix as quickly with the surrounding atmosphere.

Stability F corresponds to the most “stable” atmospheric conditions. Stability F generally occurs during the early morning hours before sunrise (thus, no solar radiation) and under low winds. The combination of low winds and lack of solar heating allows for an atmosphere which appears calm or still and thus restricts the ability to actively mix with the released gas.

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