The Board opened this sub-docket A in R20-19 (R20-19(A)) to further explore four issues: (1) historic, unconsolidated fill of coal combustion residual (CCR), also known as “coal ash”; (2) the use of temporary storage piles of coal ash, including time and volume limits; (3) CCR fugitive dust monitoring plans for areas neighboring CCR surface impoundments; and (4) the use of environmental justice screening tools.
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