ML20154P270
| ML20154P270 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/25/1988 |
| From: | Brooks R TENNESSEE VALLEY AUTHORITY |
| To: | Stewart P TENNESSEE, STATE OF |
| References | |
| NUDOCS 8806030280 | |
| Download: ML20154P270 (3) | |
Text
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TENNE *SEE VALLEY AUTHORITY KNOXVILLE. TENNESSEE 37902 Mg 251988 Mr. Philip L. Stewart.. Manager Chattanooga. Field Office Division of Water Pollution Control 2501 Milne Avenue Chattanooga, Tennessee 37406-3399
Dear Mr. Stewart:
SEQUOYAH NUCLEAR PLANT (3QN) - NPDES PERMIT NO. TN0026450 - USE OF HERBICIDE TO CONTROL AQUATIC WEED GROWTH IN THE DIFFUSER POND This is notification that TVA intends to use herbicides to control aquatic weed growth in the diffuser pond, yard pond, and low volume waste treatment pond at SQN.
The sudden die-off of mature milfoil plants in the diffuser pond in January 1988 resulted in the partial plugging of the diffusers for several days.
To prevent a similar or possibly worse situation in the future, we are planning to apply herbicidos (2.4 D end/or Endothall) to the diffuser pond during the spring and summor to control the growth of aquatic weeds.
The first treatment is planned for tho week of June 6.
The portinont information on these compounds is enclosed.
All treatments will be performed by employees in TVA's Vector and Aquatic Plant Management Program who have experience with herbicide application in the TVA reservoir system and are State certified applicators.
The herbicido compounds and application techniques will be the same as those used for milfoil control in the reservoir system.
We also anticipate needing to apply these herbicides in the yard pond and low volume waste treatment pond because fairly extensive aquatic weed growth is also occurring in theso impoundments.
If your staff has any questions concerning this matter, please have them call Madonna E. Martin at (615) 632-6695 in Knoxville.
i Sincerely, l/d
/
I Ralph H. Brooks, Director Environmental Quallts t
i Enclosure cc: Soo page 2
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An Equal Opportunity Employer
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-Mr.JPhilip'L. Stewart rty( 2 51988 1
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ec (Enclosure)-
Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects Division U.S. Nuc1 car Regulatory Commission Region II 301 Marietta Street, NW., Suito 2900 Atlanta, Georgia 30323 Mr. Bruce R. Barrett, Director Water Management Division U.S. Environmental Protection Agency, Region IV 345 Courtland Street, NE.
Atlanta, Georgia 30365 U.S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C.
20555 1
Mr. Ralph N. Sinclair, Manager Permits Section Division of Water Pollution Control Tennessec Department of Health and Environment TERRA Building 150 Ninth Avenue, North Nashv111c, Tennessoc 37219-5404 Mr. G. G. Zech, Assistant Director for Projects TVA Projects Division U.S. Nuc] car Regulatory Commission One White Flint, North 31555 Rockville Pike Rockville, Maryland 20852
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ENCLOSURE l
i Description of Herbicides l
2.4-D Dimethyl Amine Salt of 1.
General compoLition:
2,4-D Amine 2,4-Dichlorophonoxy acetic acid or 2,4-D BEE - Butoxyethyl Ester of 2,4-Dichlorophonoxy acetic acid 2.
96-hour median tolerance limit:
Not available.
Not toxic to aquatic animals at labeled use rate.
Some fish mortality at 100 ppm 2,4-D acid.
3.
Quantities to be used:
Maximum concentration of 2.0 ppm in treated water.
Less than 10 percent of the total water volume will be treated.
4.
Frequency of use:
Maximum of three applications per year - May, July, September.
5.
Proposed discharge concentrations:
Less than 0.2 ppm.
6.
EPA registration numbers:
2.4-D Amine EPA Reg. No. 264-2AA EPA Reg. No.- 39511-64 EPA kes. No. 677-296 EPA SLN No. TN81001 SPA Reg. No. 2217-2 2.4-D BEE EPA Reg. No. 264-109AA ENDOTHALL 1.
General composition: Aquathol-K - Dipotassium Salt of Endothall Hydrothol 191-Mono (N.N-dimethyl alkylamine) Salt of Endothall 2.
96-hour median tolerar.ce limit:
Aquathol K - LC50 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />) 0.06-0.4 ppm for bluegill.
3.
Quantities to be used:
Maximum of 1.5 ppm endothall acid in treated water. Less than 10 percent of the total water volume will be treated.
4.
Frequency of use: Maximum three times per year - May, July, September.
5.
Proposed discharge concentrations:
Less than 1.5 ppm.
6.
EPA registration numbers:
EPA Res. No. 4581-204 - Aquathol K EPA Reg. No. 4581-174 - Hydrothol 191 EPA Reg. No. 4581-172 - Hydrothol 191, granular
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