NC0036269_Spill Report_20221002

Strickland, Bev
From: Sims, James <[e-mail]>
Sent: Thursday, October 6, 2022 9:47 AM
To: Scheller, Roberto
Subject: [External] 5-Day Follow up Bypass report
Attachments: RRRWWTP Step-1 WAS Line break Bypass Report 10-02-22.pdf
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Mr. Scheller,
Please see the attached for the 5-Day follow up of the bypass event from Sunday 10/02/2022.
Let me know if you have any questions or concerns.
Thank you.
4me4 S
Wastewater Operations Manager
Water & Sewer Authority of Cabarrus County
6400 Breezy Lane Concord, NC 28025
Office — 704-788-4164 ext. 114
Fax — 704-786-1967
Cell — 704-200-8068
i

North Carolina Department of Environment and Natural Resources
DWR
Division of Water Resources
VVWTP Upset , Spill, or Bypass 5-Day Reporting Form
(Please Print or Type Use Attachments if Needed)
Permittee: Water and Sewer Authority of Cabarrus County
NC0036269
Permit Number:
Facility Name: Rocky River Regional WWTP County: Cabarrus
Incident Started: Date: 10/02/2022 Time: 1030 am
Incident Ended: Date: 10/02/2022 Time: 1111 am
Level of Treatment:
None Primary Treatment X Secondary Treatment Chlorination/Disinfection Only
Estimated Volume of Spill/Bypass: 10,045 gallons (must be given even if it is a rough estimate)
Did the Spill/Bypass reach the Surface Waters? _Yes X No
If yes, please list the following:
Volume Reaching Surface Waters: Surface Water Name:
Did the Spill/Bypass result in a Fish Kill? Yes No
Was WWTP compliant with permit requirements? X Yes No
Were samples taken during event? Yes X No
Source of the Upset/Spill/Bypass (Location or Treatment Unit):
10" waste activated sludge cast iron pipe failure.
Cause or Reason for the Upset/Spill/Bypass:
Aeration basin 6 excavation for plant expansion was in close proximity to the waste activated sludge line that
failed. After the heavy rains from tropical storm Ian, the cast iron pipe and the sloped wall for the excavation
failed (unsure if one failure caused the other). Both failures led to waste activated sludge leaking into the
excavation area.
Spill/Bypass Reporting Form (August 2014)

WWTP Upset , Spill, or Bypass 5-Day Reporting Form
Page 2
Describe the Repairs Made or Actions Taken:
All waste activated flow was cut off. Cleaning and camera work identified that the leak was due to failure
of the step-1 WAS line. The step-1 WAS line was then isolated and all WAS flow from step-1 and step-2
was directed down the step-2 WAS line.
Action Taken to Contain Spill, Clean Up and Remediate the Site (if applicable):
All bypass flow was isolated to the excavation. Sump pumps were then used to pump contents of the
excavation to the plant drain.
Action Taken or Proposed to be Taken to Prevent Occurrences:
The waste activated line that failed will be plugged and abandoned.
Additional Comments About the Event:
24-Hour Report Made To: Division of Water Resources x Emergency Management
Contact Name: Roberto Scheller Date: 10/03/2022 Time: 09:15am
Other Agencies Notified (Health Dept, etc):
Person Reporting Event: James Sims Phone Number: 704-788-4164 ext.114
Did DWR Request an Additional Written Report? _Yes X No
If Yes, What Additional Information is Needed:
Spill/Bypass Reporting Form (August 2014)