Brunner Island, LLC

Climate Impact & Sustainability Data (2015, 2016)

Implemented a Fugitive Dust Control Plan to minimize dust emissions from Coal Combustion Residuals (CCR) handling and storage.

Watered roads and dikes as necessary.
Sluiced bottom ash with water to prevent dust during transport.
Dewatered bottom ash to ensure adequate moisture to prevent dusting.
Used pipelines to transport fly ash and scrubber slurry.
Implemented a thickening process to increase solids content in slurry, reducing moisture and minimizing dusting.
Utilized pozzolonic characteristics of fly ash to create a concrete-like material minimizing dusting.

Factors of safety for the critical failure section comply with the requirements of the USEPA rule for the long-term maximum storage pool and seismic load cases for the section analyzed, as well as for the surcharge case using an extrapolated groundwater surface profile.

Shallow slope failures observed previously suggested that the factor of safety for deep-seated failure surfaces may also be critical.
Moisture on the downstream face and toe of the embankment was more pronounced than at other sections of the embankment, with wet soils and ponded water extending up to 5 feet up the slope.
Variation in the fines content of the embankment fill material, especially the higher fine contents at Section 1-1, may also partially explain the higher embankment phreatic level.
Potential for overtopping the embankments.

Slope stability analyses of the critical section of the embankment were performed for the long-term maximum storage (normal) pool, maximum surcharge pool, and seismic load cases.
The potential for liquefaction was determined through a triggering analysis using methods proposed by Idriss and Boulanger (2008) and Youd and Idriss (2001).
Seismic slope stability analyses were performed using the pseudostatic seismic coefficient method.
Deformation analyses were conducted using the Jansen method (1988).

Frameworks Used: USEPA 40 CFR Parts 257 and 261