NCDP Scientific Advisory Council Agenda_Nov2023

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NCDP Scien�fic Advisory Council Agenda – Virtual Mee�ng
1:00 pm – 4:00 pm
November 17, 2023
Microsoft Teams meeting
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Meeting ID: 239 392 574 272
Passcode: 7Bwdwx Download Teams | Join on the web Or call in (audio only) [phone],,617372820# United States, Raleigh
Phone Conference ID: 617 372 820#

Time Topic Speaker(s)
1:00 to 1:15 Convene
• Introduc�ons
• Approve minutes from 7/14/23 and 9/29/23
NCDEQ facilitator
1:15 to 2:00 Clarity assessment parameters and Water Quality
Standard (WQS) approach discussion, consensus vote
Cam McNutt, NCDEQ

2:00 to 2:30 U�lizing satellite imaging technology to visualize algal
blooms
Mark Vander Borgh,
NCDEQ
2:30 to 2:40 Break
2:40 to 3:00 EPA’s 2019 Cyanotoxin Recommended Criteria Guidance Joel Hansel, USEPA
Region 4
3:00 to 4:00 Guided discussion of algal blooms and cyanotoxins SAC Co-Chairs Jud
Kenworthy and Hans
Pearl
4:00 Adjourn NCDEQ facilitator

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Questions for SAC resolution:
Satellite imagery
1. What is causing the satellite hot spots?
2. Based on satellite imagery, what defines a bloom of concern? (cell densi�es and/or area?)

EPA approach - prevention
3. What cyanotoxins are appropriate to consider for criteria in NC surface waters? (microcys�n,
cylindrospermopsin, other?)
4. Are there different cyanotoxins of concern for freshwater vs. saltwater?
5. Is the EPA recrea�onal criteria magnitude of 8 µg/L for microcys�n appropriate?
6. Is the EPA recrea�onal criteria magnitude of 15 µg/L for cylindrospermopsin appropriate?

EPA approach - management
7. What criteria levels are appropriate for swimming advisories?

Nutrient relationship
8. What is the correla�on between cyanotoxins and nitrogen and phosphorus?

If these ques�ons can’t be answered, what specific data is needed to answer them?