ML102660023

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

ML102660023
Person / Time
Site:	Sequoyah
Issue date:	09/21/2010
From:	Church C Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation, State of TN, Dept of Environment & Conservation, Div of Water Pollution Control
References
TNR050015
Download: ML102660023 (2)

Text

Tennessee Valley Authority, Post Office Box 2000. Soddy Daisy, Tennessee 37384-2000 September 21, 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.

TNRO50015 SECTOR 0 EXCEEDANCE OF THE BENCHMARK MONITORING REQUIREMENT.

Please find enclosed the thirty day notification and the lab analysis 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 8/30/2010 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 8/17/2010 8/30/2010 10 5.0 The Tennessee Storm Water Multi-Sector General Permit for Industrial Activities requires

.informing the division's local Environmental Field Office (EFO) within 30 days from the time storm water monitoring results were received, describing the likely cause of the exceedance(s).

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Likely Cause of the Exceedance(s)

The likely cause of the exceedances(s) of the benchmark monitoring requirement for total recoverable iron is elevated background iron concentration in the soil around the storm water outfalls (based on historical sampling). The placement of gravel, booms, and/or hay bales, in addition to general housekeeping occurred earlier in the year. However, a walk down of the outfalls revealed the need for additional ground cover such as gravel and rip rap on exposed soil.

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

Sincerely,~

Christopher R. Church Site Vide President Sequoyah Nuclear Plant Enclosures cc (Enclosures):

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555