HomeMy WebLinkAbout8504_Duke_CraigRoad_GeocompositeRepair_DIN26034_201605051
Frost, Larry
From:Frost, Larry
Sent:Thursday, May 05, 2016 9:58 AM
To:'Witt, Kimberlee'; Mckee, Shawn
Cc:Sullivan, Ed M; Martin, Melonie Y; Andrews, Evan; Mussler, Ed (ed.mussler@ncdenr.gov)
Subject:RE: Duke Energy Belews Creek Craig Road Landfill (8504-INDUS)
Kim
Thank you for the email notification.
We concur with your course of action. Once you have assessed the situation and the repairs required please update us.
Our expectation is that an appropriate repair will be made in a safe, thorough, and timely manner.
Larry
From: Witt, Kimberlee [mailto:Kimberlee.Witt@duke‐energy.com]
Sent: Wednesday, May 04, 2016 9:53 AM
To: Mckee, Shawn <shawn.mckee@ncdenr.gov>; Frost, Larry <larry.frost@ncdenr.gov>
Cc: Sullivan, Ed M <Ed.Sullivan@duke‐energy.com>; Martin, Melonie Y <Melonie.Martin@duke‐energy.com>; Andrews,
Evan <Evan.Andrews@duke‐energy.com>
Subject: Duke Energy Belews Creek Craig Road Landfill (8504‐INDUS)
Shawn/Larry‐
On May 1, Belews Creek Steam Station had a 2.5” rainfall event which caused erosion in the Craig Road landfill.
The erosion occurred inside of the limits of waste between cells 1 and 2, no material was lost outside of the
waste boundary.
The velocity of rainwater flow separated panels of the geocomposite drainage layer (ties broke loose allowing
ash to migrate under the geocomposite and movement of the geocomposite in Phase 2)
The area of separation is approximately 100‐feet in length
The underlying geomembrane appears to remain intact
Duke intends to proceed with the following course of action:
1. Given the potential for upcoming storms, and to reduce risk to staff working out in the open, repairs should wait
until the inclement weather has passed. In the meantime, the affected area will be monitored for additional
erosion.
2. Once the site can be safely accessed, the separated geocomposite will be cleaned and CCR material removed
from around and under the geocomposite using hand tools. Vacuum trucks could be mobilized if an excess of
CCR material is discovered.
3. The situation will be assessed once the area is exposed to confirm the plan to repair the geocomposite drainage
layer separation. Recommended options include: re‐connecting existing geocomposite drainage layer if there is
adequate overlap; placing a geotextile or geocomposite drainage layer “patch” of the affected area; or removing
and replacing affected geocomposite drainage layer. This should be followed by replacing the protective cover
layer with bottom ash or soil and verifying the protective cover thickness.
4. Once the geocomposite is repaired, evaluate options for contact water management with the intent of
redirecting water flow from this area or stabilizing the area to better accommodate water flow.
Let me or Melonie know if you need any additional information in regards to the proposed actions at Belews Creek Craig
Road landfill.
2
Kim
Kimberlee Witt, PE
DUKE ENERGY
Sr. Engineer - Environmental Services
3191 Pine Hall Rd.
Walnut Cove, NC 27009
336-215-4576