ML102940037

Tennessee Storm Water Multi-Sector General Permit for Industrial Activities Permit No. TNR050015 Sector O Exceedance of the Benchmark Monitoring Requirement

ML102940037
Person / Time
Site:	Sequoyah, NS Savannah
Issue date:	10/19/2010
From:	Church C Tennessee Valley Authority
To:	State of TN, Div of Water Pollution Control, Office of Nuclear Reactor Regulation
References
Download: ML102940037 (2)

Text

Tennessee Valley Authority. Post Office Box 2000. Soddy Daisy. Tennessee 37384-2000 October 19, 2010 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.

TNR050015 SECTOR 0 EXCEEDANCE OF THE BENCHMARK MONITORING REQUIREMENT.

Please find enclosed 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 for the exceedance of the benchmark monitoring requirement for total recoverable iron at Storm Water Outfall Nos. 1, 2, and 15:

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 re-sampled for total recoverable iron on August 17, 2010 based on high iron results earlier in the year (reference thirty day notification dated April 01, 2010). The analytical monitoring results for Storm Water Outfalls Nos. 1, 2, and 15 exceeded the benchmark monitoring requirement for total recoverable iron as stated in Table 0-2, Benchmark Monitoring Requirements for Steam Electric Power Generating Facilities. Storm water 17 has not been re-sampled, to date, due to the lack of a qualifying event and/or no flow conditions.

TABLE 1 Storm Water Sample Received Original Backup Average Benchmark Outfall No. Date Date Sample Sample Sample Monitoring Results Results Results Requirement (mg/L) (mg/L) (mg/L) (mg/L) 1 3/11/2010 3/19/2010 12.0 11.0 11.5 5.0.

resample 1 8/17/2010 8/3012010 8.2 - - 5.0 2 3/02/2010 3/08/2010 6.3, 5.5, 5.2 4.3, 5.2, 5.2 5.3 5.0 resample 2 8/17/2010 8/30/2010 8.6 - - 5.0 15 3/11/2010 3/19/2010 7.4 7.6 7.5 5.0 resample 15 8/1712010 8/3012010 10 - - 5.0 QOLO\

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 at Storm Water Outfall Nos. 1, 2, and 15. A brief summary of the proposed modifications, including a timetable for implementation, follows.

Storm Water No. 1 Per the SQN SWPPP, there are no paved surfaces in this drainage area. Ground cover consists of rip-rap and grass.

The following modifications will be made by 12/31/10: Gravel will be added to the base of the hill prior to the culvert and rip rap will be added to the drainage ditch.

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

The following modifications will be made by 12/31/10: More gravel will be added prior to the inlet of the pipe. Rip rap will be added in the area approaching the guard rail.

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

The following modifications will be made by 12/31/10: Gravel or seed will be added along the fence line in the bare spots. Also, at the north end of the fence line, improvements will be made to increase drainage.

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

I certify under penalty of law that this document and all attachments were preparedunder my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry.of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, 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, Christopher R. Church Site Vice President Sequoyah Nuclear Plant SAH cc: U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555