ML20005G500

Forwards Approved Proposed Change to NPDES Permit to Use Halocide Product for Microbiological Control in Smaller Cooling Tower

ML20005G500
Person / Time
Site:	Fort Saint Vrain
Issue date:	01/12/1990
From:	Fuller C PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
P-90018, NUDOCS 9001190249
Download: ML20005G500 (4)

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- 2420 W.' 26th Avenue, Suite:1000, Denver, Colorado 80211 r

Janua ry 12, 1990 Fort St. Vrain Unit No. 1-i P-90018 y

s-J z U. S. Nuclear. Regulatory Commission n'

ATTN:

Document' Control Desk LMail Stop P1-37~

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- Washington, D..C. 20555 Docket No. 50-267 c

SUBJECT:

Change to NPDES Permit-

REFERENCE:

PSC Letter, Fuller to 8

Document Control Desk, dated December 21, 1989 (P-895u3)

Dear Sir:

On December 21, 1989, Public Service Company advised the NRC that a

. proposed change to the NPDES permit for Fort-St. Vrain (FSV) had been 1

submitted to the Colorado Department of Health (see reference).

--A'cceptance of the proposed change has been received from the Colorado Department. of Health.

In accordance with the FSV Technical 1 Specifications Appendix B, Section 3.2 (c), a copy of the approval to

.use a Halocide product for microbiological control in the smaller cooling tower is hereby submitted.

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Ifo you fhave any: questions'concerni'ngJ his submittal, pleasel contact t

1Mr. M.LH Holmes at'(303) 480-6960.-

Sincerely,

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-Manager,: Nuclear Production-n 9-.

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h-Tec:._ Regional Administrator, Region IV VATTN:.- Mr. T;: F' Westerman, Chief F'

Projects Section B:

D' Mr ER. E; Far'rell' 17 JSenior-Resident Inspector Fort?St.-Vrain-n.

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COLORAD.O DEPARTMENT OF HEALTH 4210 East 11th Avenue fetefan Denver, Colo, ado 80220 3716 003) 322 9076 (Main Building / Denver)

Phone (303) 320 8333 003) 3201529 (Ptarmigan Place / Denver)

(303) 245-7196 (Crand Junction Regional oflice)

December. 21, 1989

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Thomas M. Ve,non, M.D.

Mr. Peter J. Cohlmia, Environmental Coortiinator tucutin Dieuw, Public Service Company of Colorado P.O. Box 840-Denver, CO 80201-0840 Re: Use of Halocide Product for Disinfection in the Cooling Tower; Fort St. Vrain Station; CDPS Permit No. O> 0001121, Weld County

Dear Pete:

The Division has reviewed ~your letter dated November 27, 1989 in which you requested to use the Halocide product for microbiological control in the j

f smaller sevice water cooling tower, instead of chlorine gas which has been _

previously used._ This Halocide product contains halogenated dialkylhydantoin' j

derivatives in briquette form, which includes the following active i

-ingredients: 1-bromo-3-chloro-5,5-dimethylhydantoin (CAS No. 126-06-7);

1,3-dichloro-5,5-dimethylhydantoin (CAS No. 118-52-5); and 1

1,3-dichloro-5-ethyl-5-dimethylhydantoin (CAS No. 89415-87-2). The product-releases active bromine and chlorine. As you had indicated in your letter, this product will.be used twice weekly at approximately 12-pounds / application added to the smaller cooling tower. With a discharge of 400,000 gallons per.

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' day of this cooling tower water, this equates to a concentration of 0.0036 l

mg/l of Halocide product on days when it is added.

As you had indicated, the other (larger) coolir.g tower is not in use; thus,-

i this product will not be used for (and has not been approved for use in) the f

larger cooling tower.

I Based upon the information that you provided to the Division, as well as upon available toxicity test data for the three halogenated dialkylhydantoin derivatives and for free chlorine and free bromine, the Division has determined that this product may be used in the cooling tower. However, this approved use is conditional upon performing the following requirements for total residual' chlorine and total bromine. All the limitations and monitoring 3

requirements for total residual chlorine in the permit are still applicable.

In addition, total bromine will need to be monitored on a weekly basis at discharge points 001A and 002. The analyses for total bromine should be reported on the discharge monitoring reports. Eventually, the Fort St. Vrain permit will be amended as a minor modification to include the monitoring for total bromine.

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Mr. Peter J. Cohlmia. Environmental Coordinator, Public-S:;rvica Company

!1 December 21, 1989L

.Page 2

'Ihe Division's decision for approval of this product's use for the smaller -

cooling' tower -is. based upon the following toxicity data:

.Halocide product, mg/l:

(designated as GSD-560 in research tests)

Daphnia:

' O.40-(0.3 - 0.5)

Lc50 (Manufacturer's Acute Toxicity Test) 0.30 No Effect Level i

Trout:.

0.50 (0.3'- 0.9) 1f50 (Acute Toxicity Test) 0.30 No Effect Level' t

u Bluegill:

1.2 (0.9 - 1.7)

Ir50 (Acute Toxicity Test)-

0.9

'No Effect Level i

i Free Bromine:

-Daphnia:

10 mg/l killed Daphnia in scft water. (EPA Blue Book)

Goldfish:

20 mg/l killed Goldfish (EPA Blue Book)

Guppy:

18--.225 mg/l 125-d EC50 (See JWPCF June 1981 issue)

Marine Fish:

10 mg/l caused violent irritant response (EPA Blue Book)

Marine Fish:

1 mg/l No Effect Level

-(EPA Blue Book)

Since the existing limits for total residual chlorine in the permit are based upon the water quality standard of 0.003 mg/1, the existing limits are adequate for protection of aquatic life in the receiving stream segments.

If you should have any comments or questions, please call me at (303)+331-4750.

Sincerely,c a.

Don Holmer Industrial Permits Engineer Pemits and Enforcement Section WATER QUALITY CONTROL DIVISION xo: Victor Sainz, Field Services Section, WQCD Pat Nelson, Permits and Enforcement Section, kED Sandy Marek, Pemits and Enforcement Section, WQCD Bob McConnell, Groundwater and Standards Section, WQCD EPA Region VIII, Water Management Division, Compliance Branch, Pemits Section Weld County Health Department MS-3 File m

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