NC0024937_staff comments_20150724

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Belnick, Tom
From: Belnick, Tom
Sent: Friday, July 24, 2015 11:29 AM
To: Davis, Timothy B; Belnick, Tom; Berry, Ron; Chernikov, Sergei; Grzyb, Julie; Rodriguez,
Teresa; Song, Yang
Subject: FW: Lower Catawba Basin Nutrient TMDL Development
Attachments: Preliminary Lower Catawba Nutrient TMDLs_Modeling Results_draft to NC.docx; Appendix A
- Map of Catawba-Wateree Impaired Sites 2014 303d.pdf; Appendix B - Lower Catawba
Nutrient TMDLS_Modeling Results Appendix Tables.docx
Just a heads up for next Catawba Basin renewals (in 2019?). SC is currently preparing a TMDL due to impaired chl-a
waterbodies. Once completed, the TMDL might require additional nutrient reductions from the following WWTPs in NC:
• CMUD Sugar Creek WWTP (NC0024937)
• CMUD Irwin WWTP (NC0024945)
• CMUD McAlpine (NC0024970)
• Union County/12 Mile Creek WWTP (NC0085359)
Our TMDL/Modeling Unit (Pam Behm) is NC lead at this time during model evaluation. I'll place a copy of this email in
each Permit File as a reminder of potential future TMDL permitting action.
Tom Belnick
Supervisor, NPDES Complex Permitting Unit
NCDWR/Water Quality Programs
919-807-6390
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties
From: Cantrell, Wade [mailto:[e-mail]]
Sent: Thursday, July 23, 2015 11:30 AM
To: Behm, Pamela; Fransen, Tom; Risgaard, Jon; Templeton, Mike; Belnick, Tom
Cc: Zimmerman, Jay; Carswell, Matthew; Harden, Wayne; Preston, Heather; Montebello, Michael; DeBessonet, Jeff;
Litton, John; Baize, David; Wilson, David
Subject: Lower Catawba Basin Nutrient TMDL Development
Pam and others -
We have been coordinating with our technical counterparts at DENR over the last couple of years during
development of modeling analyses to address nutrient impairments in the reservoirs in the SC portion of the
Catawba basin. Our contractor, Systech, has updated and calibrated the WARMF model, and we have used
the model to start looking at aggregate phosphorus and nitrogen reductions that would be needed to attain
water quality standards in the lakes in preparation for development of nutrient TMDLs. Some might not be
aware of DHEC's Catawba TMDL web page which has some additional information:
http://www.scdhec.gov/HomeAndEnvironment/Pollution/CleanUpPrograms/OngoingProjectsUpdates/Cataw
ba/

We previously provided the updated model and calibration report to DENR and stakeholders
for comments. The final calibration report including comments and responses was distributed via the web
page last year and is available at the above linked site.
At this point, we wanted to share a draft writeup of some initial results from our application of the model to
determine appropriate nutrient Toads in the basin. We are continuing to work with the model and believe it
would be beneficial to engage your modeling group, and then EPA, as we refine the aggregate reduction
scenarios before sharing with stakeholders sometime before the end of the year.
We would appreciate your initial review of the attached documents, and we would like to follow up with your
modeling group with a call next month to hear any initial comments you may have and discuss next
steps before we share the draft results with EPA.
Thanks,
Wade
Wade M. Cantrell, Manager
303d, Modeling & TMDL Section
S.C. DHEC Bureau of Water
[phone]