ML090790101

Tennessee Storm Water Multi-Sector General Permit for Industrial Activities Permit No. TNR050000 Sector Exceedance of the Monitoring Cut-Off Concentration

ML090790101
Person / Time
Site:	Sequoyah
Issue date:	03/17/2009
From:	Cleary T Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation, State of TN, Div of Water Pollution Control
References
Download: ML090790101 (3)

Text

9 1 ;ý Tennessee Valley Authority, Post Office Box 2000, Soddy-Daisy, Tennessee 37384-2000 March 17, 2009 Chattanooga Environmental Field Office Division of Water Pollution Control State Office Building, Suite 550 540 McCallie Avenue Chattanooga, Tennessee 37402 TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT - TENNESSEE STORM WATER MULTI-SECTOR GENERAL PERMIT FOR INDUSTRIAL ACTIVITIES PERMIT NO. TNR050000 SECTOR 0 EXCEEDANCE OF THE MONITORING CUT-2 OFF CONCENTRATION This letter provides the sixty day notification of the review of Sequoyah Nuclear Plant's Storm Water Pollution Prevention Plan (SWPPP) and summary of the Best Management Practices (BMPs) modifications and additions concerning the monitoring cut-off concentration for total recoverable iron for Storm Water Outfall Nos. 2, 15, and 17.

Description of Event Tennessee Storm Water Multi-Sector General Permit for Industrial Activities Sector 0 requires annual monitoring of total recoverable iron. Sequoyah Nuclear Plant (SQN) sampled for total recoverable iron on January 10, 2009 and February 2, 2009. The storm water analytical monitoring results were received on January 22, 2009 and February 10, 2009. The cut off concentration for total recoverable iron is 5.0 mg/L, as stated in Table7O-1, Monitoring Requirements for Steam Electric Power Generating Facilities. The analytical monitoring results for Storm Water Outfalls Nos. 2, 15 and 17 were 11.0 mg/L, 6.9 mg/L, and 5.7 mg/L respectively.. See table below:

Storm Sample Date Received Result Result Cut-off Water Concentration Outfall No'.

2 01/10/2009 01/22/2009 11.0 mg/L 5.0 mg/L 15 02/02/2009 02/10/2009 6.9 mg/L 5.0 mg/L 17 02/02/2009 02/10/2009 5.7 mg/L 5.0 mg/L

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Likely Causes of the Exceedance

'The likely causes of the exceedances of the cut-off concentration for total recoverable iron are elevated background iron concentration in the soil around the storm water outfalls (based on historical sampling) and the need for additional BMPs, as discussed in the thirty day notification letter dated February 19, 2009.

Preventative Measures taken to Minimize a Reoccurrence:

Sequoyah Nuclear Plant's SWPPP has been reviewed to determine the modifications and additions to the plan which would assist in reducing the iron.effluent concentration of Storm Water Outfall Nos. 2, 15, and 17.

Storm Water No. 2 Per the SQN SWPPP, there are no paved surfaces in this drainage area. Ground cover consists of crushed stone, gravel, pavement and grass. Drainage ditches are equipped with check dams as BMPs.

The following modifications were made: The roads have been re-graveled. New rip rap has been added to the check dams in the drainage ditch and general housekeeping/cleaning has taken place in the area around Storm Water No. 2. Storm water sampling and analysis will be conducted during 2009 to determine if these modifications and additions have been effective and if additional measures should be taken.

Storm Water No. 15 Per the SQN SWPPP, there are no paved surfaces in this drainage area. Ground cover consists of rip-rap, grass, and hay bales. Rock lined drainage ditches are equipped with check dams as BMPs.

The following modifications were made: New rip rap has been placed around the inlet to the pipe and general housekeeping/cleaning has taken place in the area around Storm Water No. 15. Storm water sampling and analysis will be conducted during 2009 to determine if these modifications and additions have been effective and if additional measures should be taken.

Storm Water No. 17 Per the SQN SWPPP, ground cover and erosion controls consist of pavement, gravel, and rip rap in this drainage area.

The following modifications were made: New rip rap has been added in the drainage ditch and general housekeeping/cleaning has taken place in the area around Storm Water No. 17. Storm water sampling and analysis will be conducted during 2009 to determine if these modifications and additions have been effective and if additional measures should be taken.

If you have any questions or need additional information, please contact Ann Hurt at (423) 843-6714 or Stephanie Howard at (423) 843-6700 of Sequoyah's 'Environmental staff.

I certify under penalty of law that this document and all attachments were prepared under-my direction or supervision in accordance with a system designed to assure that qualified personnel properlygather and evaluate the information submitted. Based on

-my inquiry of the person or persons who manage the system, or those persons directly responsiblefor gathering the information, the information submitted is, to the best of my

'knowledge-andbelief, true, accurate,and complete.' I am aware that there are significantpenalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Sincerely, Timothy P. Cleary Site Vice President Sequoyah Nuclear Plant cc: U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 cc: D. J. Bodine, POB 2A-SQN A. A. Ray, WT 7C-K C. R. Church, POB 2B-SQN B. A. Wetzel, OPS 4A-SQN T. P. Cleary, OPS 4A-SQN G. R. Signer, WT 6A-K D. E. Pittman, BR 4T-C EDMS, WT CA-K

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