NC0001422_Data Monitoring Reports_20220504

Bob and I reviewed available instream data for Sutton this morning. This site does not have any seeps, it
discharges wastewater through 2 main outfalls:
• Outfall 001 to Cape Fear River. The flow from this outfall is insignificant, 99% of the time it is less
than 1 MGD, 1% of the time it slightly exceeds 1 MGD.
• Outfall 008 to Sutton Lake. This is the main outfall that typically discharges between 100 MGD
and 200 MGD.
The permit requires for Cape Fear River Outfall 001 to be monitored upstream and downstream, and for
Sutton Lake Outfall 008 to be monitored at Bay 8 downstream of the discharge (there is no upstream
location).
Sampling for all three instream sites indicates that Arsenic, Cadmium, Chloride (Lake Sutton site only),
Chromium, Copper, Hardness, Lead, Mercury, Selenium, and Zinc are below detection level or well
below the standard. There were 3 exceedances of the Chloride state standard at the Cape Fear
downstream monitoring station, the hardness level was also significantly elevated during these sampling
events. This can be attributed to the salt water intrusions because Cape Fear River at this location is
tidally influenced.
The data shows that current operations and legacy impacts of the Sutton Plant do not negatively
influence water quality of Sutton Lake and Cape Fear River. The facility will continue to monitor the
receiving streams.