Maximum Ground Level Impact

• 2.3 PPB in 4 grid cells.

• 1.0 PPB or above in 30 grid cells.

• Negligible in all other cells.

• 1 PPB impact in Northern Virginia.

• Negligible impact in Richmond and Hampton Roads maintenance areas.

• Well below what is considered significant for this type of model; i.e. 10 ppb

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