ML20024H840
| ML20024H840 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/20/1993 |
| From: | Fierra D, Schmidt E ENVIRONMENTAL PROTECTION AGENCY, NEW HAMPSHIRE, STATE OF |
| To: | |
| References | |
| NUDOCS 9308250336 | |
| Download: ML20024H840 (100) | |
Text
{{#Wiki_filter:r_____- - s j t NEW HAMPSHIRE DEPARTMENT OF U.S. ENVIRONMENTAL PROTECTION ENVIRONMENTAL SERVICES AGENCY, REGION I WATER SUPPLY & POLLUTION WATER MANAGEMENT DIVISION CONTROL DIVISION WASTEWATER MANAGEMENT BRANCH P.O. BOX 95 JOHN F. KENNEDY FEDERAL BUILDING CONCORD, NEW HAMPSHIRE BOSTON, MASSACHUSET*S 03302-0095 02203-2211 JOINT PUBLIC NOTICE OF A DRAFT OF A NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT TO DISCHARGE INTO THE WATERS OF THE UNITED STATES UNDER SECTIONS 301 AND 402 OF THE CLEAN WATER ACT (THE "ACT"), AS AMENDED; REQUEST FOR STATE CERTIFICATION UNDER SECTION 401 OF THE ACT; ISSUANCE OF A STATE SURFACE WATER PERMIT UNDER NH RSA 485-A:13, I(a) ; AND NOTICE OF A PUBLIC HEARING. DATE OF NOTICE: August 20, 1993 PERMIT NUMBER: NH0020338 PUBLIC NOTICE NUMBER: NH-022-93 NAME AND MAILING ADDRESS OF APPLICANT: North Atlantic Energy Service Corporation P. O. Box 300 Seabrook, New Hampshire 03874 NAME AND ADDRESS OF THE FACILITY WHERE DISCHARGE OCCURS: North Atlantic Energy Service Corporation Seabrook Station Route 1 Seabrook, New Hampshire RECEIVING WATER: Browns River and Atlantic Ocean RECEIVING WATER CLASSIFICATION: Browns River is Class B Atlantic Ocean is Class B The above named applicant has applied to the U. S. Environmental Protection Agency for reissuance of its NPDES permit to discharge wastewater into the designated receiving vaters. The facility is engaged in the generation of electrical power. The discharge is from: storm water, process waste water, treated sanitary waste and once-through cooling water. The permit will expire five years from the date of issuance. PREPARATION OF THE DRAFT PERMIT: The U.S. Environmental Protection Agency (EPA), and New Hampshire Department of Environmental Services have cooperated in the development of a draft permit for the above identified facility. g The effluent limits and permit conditions imposed have been { k F PDRt{f3 J
e drafted to assure that State Water Quality Standards and provisions of the Clean Water Act will be met. EPA has formally requested that the State certify the draft permit pursuant to Section 401 of the Clean Water Act and expects that the draft permit will be certified. 4 INFORMATION ABOUT THE DRAFT PERMIT: The proposed Draft NPDES Permit is based upon the actual cperational plant data presented in the NPDES Permit Application of April 11, 1991. This information reflects the actual operations of the plant since August 19, 1990, and not the design criteria that was used as the basis of the previous NPDES Permit dated July 26, 1985. Ignoring the construction aspects of the 1985 permit, the major I operational differences between the 1985 permit and the draft permit are: (1) only Unit 1 was constructed, (2) the station intake pumps now have a capability of pumping 720 MGD as compared to the original design flow of 594 MGD in the older permit, and (3) all point source discharges (Discharge 002) into the Browns River are proposed to be diverted to the ocean outfall, Discharge 001, in the near future.
- A fact sheet or a statement of basis (describing the type of facility; type and quantity of wastes; a brief summary of the basis for the draft permit conditions; and significant factual, legal and policy questions considered in preparing the draft permit) may be obtained at no cost by writing or calling EPA's contact person named below:
Mr. T. E. Landry l EPA Wastewater Management Section (Mail Code WSM) JFK Federal Building Boston, Massachusetts 02203-2211 Telephone: 617/565-3508 The administrative record containing all documents relating to the draft permit is on file and may be inspected at the EPA Boston office mentioned above between 9:00 a.m. and 5:00 p.m., Monday through Friday, except holidays. PUBLIC HEARING: The Regional Administrator has determined, pursuant to 40 CFR 5124.12, that a significant degree of public interest in the proposed permit exists and that a public hearing should be held to consider the permit. Accordingly, notice would be take that a Public Hearing will be held at the following time and place: Iate: September 20, 1993 Time: 7:00 p.m. - 10:00 p.m. Location: Seabrook Community Center 311 Lafayette Road Seabrook, NH 03874 2
, In accordance with 40 CFR S124.12, the following is a summary of the procedures which shall be followed at the Public Hearing:
- a. The Presiding Officer ~shall have the authority to open '
and conclude the Public Hearing and to maintain order; and
- b. Any persons appearing at such a Public Hearing may submit oral or written statement and data concerning the draft permit.
PUBLIC COMMENT PERIOD ( Au;;ust 20,1993 TO )~ September 20, 1993 l Interested parties may submit comments on the draft permit and the administrative record to the address no later than
. All persons, including applicants, who believe any condition of the draft permit is inappropriate, must raise all issues and submit all available arguments and all supporting material for their arguments in full by
, to the:
U.S. Environmental Protection Agency Region I, Compliance Branch (WCP) JFK Federal Building Boston, Massachusetts 02114 Ms Veronica Harrington I If, during the public comment period, significant new questions are raised concerning the permit, EPA may require a new draft permit or fact sheet or may reopen the public comment period. A Public Notice will be issued for any of these actions. FINAL PERMIT DECISION AND APPEALS: Following the close of the comment period, and after a public hearing, the Regional Administrator will issue a final permit decision and forward a copy of the final decision to the applicant and each person who has submitted written comments, oral comments or requested notice. Within 30 days following the notice of the final permit decision, any interested person may submit a request for a formal hearing to reconsider or contest the final decision. Requests for formal hearings must satisfy the requirements of 40 C.F.R. 5124.74. EDWARD J. SCHMIDT, P.E., Ph.D. DAVID A. FIERRA, DIRECTOR DIRECTOR WATER MANAGEMENT DIVISION WATER SUPPLY & POLLUTION U.S. ENVIRONMENTAL PROTECTION AGENCY CONTROL DIVISION NEW HAMPSHIRE DEPARTMENT OF ENVIRONMENTAL SERVICES 3
. i 7-27-93 DRAFT NH20338.PE1 Permit No. NH0020338 Page 1 of 25 AUTHORIZATION TO DISCHARGE UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of the Federal Clean Water Act, as amended, (33 U.S.C. Sections 1251 et sea.; the " CWA"), North Atlantic Energy Service Corporation P.O. Box 300 Seabrook, NH 03874 is authorized to discharge from a facility located at North Atlantic Energy Service Corporation Seabrook Station Route 1 Seabrook, NH to receiving water named Atlantic Ocean and Browns River in accordance with effluent limitations, monitoring requirements and other conditions set forth herein. This permit shall become effective This permit and the authorization to discharge expire at midniqht, five years from the effective date. This permit supersedes the permit issued on July 26, 1985. This permit consists of 25 pages in Part I including effluent limitations, monitoring requirements, etc., 19 pages in Part II including General Conditions and Definitions, 11 pages in Attachment A and 15 pages in Attachment B. Signed this day of Director Water Management Division Environmental Protection Agency Boston, MA REGION I DRAFT
Page 2 of 25 Permit No. NH0020338
- Part I A. Effluent Limitations and Monitoring Requirements
- 1. Except as specified in Paragraphs 1 through 10 herein, the permittee shall not discharge to the Atlantic Ocean or to the Browns River, a final effluent to which it has added any pollutants.
- a. Chlorine may be used as a biocide. No other biocide shall be used without explicit approval from the Regional Administrator and the Director, Par.I.A.1.f.
- b. Total Residual Oxidant (Chlorine) concentration, unless otherwise specified, shall be measured downstream of the unit or units being chlorinated before that stream mixes with the receiving water.
The total oxidant or chlorine residual of the ; effluent shall not result in any demonstrable harm to aquatic life or violate any water quality standard which has been promulgated.
- c. The discharges shall not jeopardize any Class B use of the receiving waters and sha.'.1 not violate applicable water quality standards for Class B water as defined by the State of New Hampshire.
- d. The permittee shall not at any time, either alone or in conjunction with any person or persons, cause directly or indirectly, the discharge of any waste into the receiving waters except waste that has been treated in such a manner as will not lower the Class B quality or interfere with the uses assigned to said waters by the New Hampshire Legislature (Chapter 311, Laws of 1967).
- e. This permit shall be modified, revoked or reissued to comply with any applicable effluent standard or limitation issued or approved under Sections 301 (b) (2 ) (C) and (D), 304(b) (2), and 307(a) (2) of the CWA, if the effluent standard or limitation so issued or approved:
(1) contains different conditions or is otherwise more stringent than any effluent limitation in this permit; or (2) controls any pollutant not limited by this permit. DgEka b7"
Page 3 of 25 . Permit No. NH0020338 If the permit is modified or reissued, it shall be revised to reflect all currently applicable requirements of the CWA.
- f. The term " Regional Administrator" means the Regional Administrator of Region I of the U.S.
Environmental Protection Agency, or his designee, and the term " Director" means the Director of the Water Supply and Pollution Control Division of the New Hampshire Department of Environmental Services or his designee.
- g. There shall be no discharge of polychlorinated biphenyl compounds such as commonly used for transformer fluid.
- h. The measurable thermal plumes from the Seabrook Station shall: (a) not block zones of fish passage, (b) not interfere with spawning of indigenous populations, (c) not change the balanced indigenous population of the receiving water, and (d) not contact surrounding shorelines.
- i. All existing manufacturing, commercial, mining, and silvicultural dischargers must notify the Regional Administrator as soon as they know or have reason to believe (40 C.F.R. 122.42):
(1) That any activity has occurred or will occur i which would result in the discharge, on a ' routine or frequent basis, of any toxic pollutant which is not limited in the permit, if that discharge will exceed the highest of the following " notification levels:" l (a) One hundred micrograms per liter (100 I ug/1); (b) Two hundred micrograms per liter (200 ug/1) for acrolein and acrylonitrile; five hundred micrograms per liter (500 ug/1) for 2,4-dinitrophenol and for 2-methyl-4,6-dinitrophenol; and one milligram per liter (1 mg/1) for antimony; (c) Five (5) times the maximum concentration ' value reported for that pollutant in the permit application in accordance with 40 C.F.R. Section 122.21(g) (7) ; or (d) Any other notification level established by the Regional Administrator in accordance with 40 C.F.R. Section 122.44(f).
Page 4 of 25 Permit No. NH0020338 . (2) That any activity has occurred or will occur which would result in the discharge, on a non-routine or infrequent basis, of any toxic pollutant which is not limited in the permit, if that discharge will exceed the highest of the following " notification levels:" (a) Five hundred micrograms per liter (500 ug/1) ; (b) One milligrcm per liter (1 mg/1) for antimony; (c) Ten (10) times the maximum concentration value reported for that pollutant in the permit application in accordance with 40 C.F.R. Section 122.21(g) (7); or (d) Any other notification level established by the Director in accordance with 40 C.F.R. Section 122.44(f). (3) That they have begun or expect to begin to use or manufacture as an intermediate-or final product or by product any toxic pollutant which was not reported in the permit application.
- j. The thermal component of the discharge shall in all aspects be in accordance with the discharge described in the permittee's NPDES Permit Application No. NH0020338, dated August 1, 1974, as modified in the reapplication dated April 5, 1991, except as specifically modified below.
(1) The permittee shall perform back-flushing (cooling water flow reversal for bio-fouling control) only during times when hydrological and meteorological conditions are such that the plume flows off-shore and/or temperature increases are minimized at the Outer Sunk Rocks. The permittee shall notify the Regional Administrator and the Director 15 calendar days before each back-flushing operation is initiated. (2) The thermal component of the discharge from the Seabrook Station shall not cause a temperature rise of more than 5.0 F in the "near-field jet mixing region". The 5 F limit shall apply only at the surface of the receiving waters. For the purposes of this paragraph the "near-field jet mixing region"
** ' -, means that portion of the receiving waters r' E i k# Ell'\3',!
F 2 within 300 feet of the submerged diffuser in the direction of discharge. This paragraph
Pago 5 of 25 Permit No. NH0020338 shall apply only to temperature rises to the extent caused by the addition of heat to the . receiving waters by the permittee. This I temperature requirement does not apply during the cooling water flow reversal (thermal backflushing) used for biological control. (3) During operation of Seabrook Station, the permittee shall conduct such additional studies as are determined by the Regional Administrator and the Director to be necessary to evaluate the accuracy of the thermal plume predictions it has submitted to EPA in support of the NPDES Permit Application No. NH0020338 for both normal operation and thermal back-flushing operations. These thermal plume verification submittals shall be in accordance with Paragraph I.A.10.g of this permit. (4) During operation of Seabrook Station, the permittee shall conduct such studies as are determined by the Regional Administrator and the Director to be necessary to continuously monitor and evaluate the effect of the Seabrook Station on the balanced, indigenous population of shellfish, fish and wildlife in and on the body of water into which the discharge is made. The proposed plan submittal shall be in accordance with Paragraph I.A.10 of this permit. (5) NPDES Permits issued from time to time in regard to the discharges from Seabrook Station will contain such further limitations or be modified to contain such further limitations on the thermal component of the discharge as the results of the above studies and other available information indicate to be necessary to assure the protection and propagation of a balanced indigenous population of shellfish, fish and wildlife in and on the receiving waters. (6) The effluent limitations of this permit shall apply to all thermal components of the discharge from the Seabrook Station, including but not limited to discharge during normal station operation and discharge during cooling water flow reversal for bio-fouling control. p,] ' ~? L7. z : . t
Page 6 of 25 Permit No. NH0020338 (7) The permittee has coated the external surfaces of the diffuser with a material approved by the Regional Administrator and the Director that would discourage the growth of marine organisms on the diffuser which might attract browsing fish which would then be susceptible to entrapment during the reversed flow back-flushing operation. The permittee may propose alternate chemicals or methods for minimizing biological growth on the diffuser nozzles to the Regional Administrator and the Director for approval. (8) The permittee shall provide a study that will evaluate the alternatives for thermal backflushing. This analysis shall consider the environmental impact and technical feasability of each alternative including seasonal impacts on fish migration and spawning; endangered species; initial dilution; and plume dispersion. Should the thermal backflushing procedure be selected as the final alternative, then the present thermal backflushing hydrological and meteorological report shall be expanded to include additional data requested the above. This study shall be submitted to EPA, the State and the TAC before the selected alternative is used to control the sessile organisms in the Intake Tunnel or by January 1, 1995, whichever comes first.
- k. The design, construction and capacity of all components of the cooling water System seaward of the inlets to the main condensers or other heat exchangers, as appropriate, of the Seabrook Station (the " Cooling Water Intake Structures")
shall in all respects be in accordance with NPDES Permit Application No. NH0020338, as submitted on August 1, 1974, and the permittee's Application for a Permit to Discharge or Work in Navigable Waters and their Tributaries, submitted to the Corps of Engineers by letter of October 25, 1974 except as Specifically modified below: (1) The Cooling Water Intake Structure shall have three intake ports. (2) The permittee shall use an anti-fouling protective coating on the Cooling Water Intake Structures. The multiport diffuser shall be maintained free of marine fouling organisms. (The objective of this paragraph DRAFT is to discourage the growth of organisms
( i l Page 7 of 25 l Permit No. NH0020338 then be susceptible to entrapment, Par. ( I.A.1.j.7 above).
- l (3) The velocity of water as it enters the l Cooling Water Intake Structures shall at no time exceed which might attract browsing fish
! which would .0 foot per second. l (4) The Cooling Water Intake Structures shall incorporate such behavioral or other i non-structural deterrents and barriers as the l Regional Administrator and/or the Director determines to be appropriate under Section 316(b) of the Clean Water Act after reviewing the results of any permittee conducted studies and any other information available. (5) NPDES Permits issued from time to time in regard to the Cooling Water Intake Structures for the Seabrook Station will contain such , further limitations and requirements or be ! modified to contain such further limitations i and requirements as the results of any l studies by the permittee and other available information indicate to be necessary to minimize adverse environmental impact from the Cooling Water Intake Structures.
- 1. It has been determined that the Cooling Water Intake Structures presently designed employ the best technology available for minimizing adverse environmental impact. No change in the location, design or capacity of the present structures can be made without prior approval of the Regional Administrator and the Director. The present design shall be reviewed for conformity to i regulations pursuant to Section 316(b) when such l are promulgated.
- m. Should the intake tunnel and/or discharge tunnel
! require dewatering during an emergency condition, the permittee shall submit to the Regional l Administrator and the Director an Emergency Dewatering Plan for their approvals as required in Paragraphs II.B.4 and II.B.5 of this permit which define " Bypass" and " Upset" operating conditions.
- n. For this permit, the " Diversion Date" is defined as the date that Discharge 002 to Browns River is terminated and all point sources to the Browns River cease. The combined flow of the treated sanitary wastewater and the plant storm water p ,- .
, runoff, Discharge 002, will be " diverted" from the
+ j '{~~ ,'- *, Browns River to the Circulating Water System into the Discharge Tunnel, Discharge 001, through a new
Page 8 of 25 Permit No. NH0020338 . j manhole. For the purposes of this permit, this I combined stream will continue to be designated as Discharge 002 for reporting purposes. The permittee shall notify the Regional Administrator and the Director at least 30 days prior: (1) to initial introduction of any Sanitarf Wastewater, or storm water into the discharge tunnel and (2) to the " Diversion Date" when all discharges into the Browns River have been terminated. It is understood that these two dates may not be concurrent when decomissioning the basin.
- o. The following chemicals are approved for water ,
discharge. These discharge levels may not be increased nor chemicals substituted without written approval by the Regional Administrator and the Director or their designees. The permittee must demonstrate that the aquatic toxicity of the proposed changes are equal to or less than approved chemicals herein listed. Calculated Maximum Discharae #301 Plant Product Concentration, com Water System Hydrazine 0.5 Secondary Steam System Ammonia 0.5 Secondary Steam System Boron 5 Primary System Lithium Hydroxide 0.5 Primary System Hydrogen Peroxide 0.5 Primary System Ethylene Glycol 50 Exterior Heating / Cooling System Propylene Glycol 50 Same as Ethylene Glycol Bulab 9328 0.4 Corrosion protection for fresh water systems Bulab 6002 20 Biocide in cooling tower Cat Floc TL 0.1 Liquid Radwaste System. To facilitate the removal materials made radio-active by neutron radiation in primary system ! Cat Floc L 0.1 Same as Cat Floc TL Nalcolyte 7134 0.1 Same as Cat Floc TL Sodium Nitrite 0.5 Heating / Cooling Systems Sodium Molybdate 0.5 Heating / Cooling Systems l Sodium Silicate 5 Auxiliary Secondary System Scale Inhibitor Morpholine 0.1 Steam Generators Ethanolamine 0.5 Secondary Steam System l
- __ = _ _ ._ .=_ . - . - - _. __ = ~ - -
7-27-93 DRAPF NII20338.PE2 Page 9 of 25 Permit No. NII0020338 Part I
- 2. During the period beginning the Effective Date and lasting through Expiration Date, the pennittee is
- j. wthorized to discharge from outfall(s) serial number (s) 001, Circulating Water System Discharge ( A combhation of all Seabrook Station waste water streams: condenser Cooling Water, Servim Water System, liquid Waste Distillate, Steam Generator Blowdown, Cooling 7bwer Blowdown, Demineralizer Waste, Seconiary T/lant Leakage, Treated Sanitary Wastes, and Storm Water Runoff) .
- a. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristic Dischame Limitations Monitorim Reauirements Measurement Sanple
- Avri. Monthly K1x. Daily Frecuency Tvoo Flow, MGD Report 720 Continuous
- Estimate i i
C Temperature Rise, (Delta-T), F** 39 41 liourly llourly Avg. m Temperature (Maximum), F Report Report Ifourly liourly Avg. J g Total Residual Oxidants (TRO), ng/l 0.15 0.15 1/ day *** Grab i pII, s.u. 6.5 8.0 1/ day *** Grab i
- The flow rate may be estimated frm pump capacity curves. ,
j ** Tenperature Rise is the difference between the Discharge Temperature (Discharge Transition , Structure) and Intake Temperature (Intake Transition Stricture) . The intake and discharge tenperatures will recorded by instruments or cmputers. The h w ature Rise and Maximum Tenperature shall be calculated as a hourly average based upon at least twelve (12 times) per !. hour.
- *** Sanples to be taken once per day at approximately the same time period. See Subparagraph "e" below for additional Tao requirements.
i l b. The pl{ of the discharge shall not be less than 6.5 standard units nor greater than 8.0 standard units or as naturally occurs in the receiving waters, Par. I.E.1.a. The pit of the marine waters at j the Intake Transition Structure shall be considered as the receiving water pli for this permit. e i
Page 10 of 25 Permit No. NH0020338 -
- c. There shall be no visible discharge of oil sheen, foam, or floating solids in the vicinity of the diffuser ports.
Naturally occurring sea foam in the discharge transition structure is allowed. Except in cases of condenser leak seeking and sealing, use of a reasonable amount of biodegradable and non-toxic material may be used to the extent necessary to locate and/or seal any condenser leak. The permittee shall report in the appropriate monthly DMR the occasions wherp.in this material was used giving the date(s) of the incident, the type of materials used and the amount of materials discharged.
- d. The temperature of the discharge at Discharge Transition Structure shall not exceed an Average Monthly of 39 F or Maximum Daily of 41 F rise over the temperature of the ;
~
intake. The Monthly Average and Maximum Daily temperatures shall be reported without limit. The temperatures shall be , based upon a one-hour average temperature at the intake and discharge.
- e. The Total Residual Oxidant (TRO) concentration shall not ,
exceed 0.15 mg/l at the Discharge Transition Structure. !
- f. Total Residual Oxidant Concentration shall be measured in the Discharge Transition Structure.
Total Residual Oxidants shall be tested using the Amperometric Titration Method, Method 4500-CL D in Standard Methods for the Examination of Water and Wastewater, 17th l Edition dated 1989 or Method 330.1 in the EPA Manual of Methods of Analysis of Water and Wastes. For this permit the Minimum Level (ML) [the minimum practical detection level) for Total Residual Oxidants has been defined as 0.05 mg/l (50 ug/1) and that value may be reduced as more sensitive test methods are approved by the EPA and the State.
- g. Samples taken in compliance with the monitoring requirements above shall be taken at the Discharge Transition Structure prior to the cooling water entering the discharge tunnel. ,
l
- h. The permittee shall submit annually a Chlorine Minimization l Report to the Regional Administrator and the Director as a component of the annual biological and hydrological report, Par. I.A.10 below. The objective of this chlorination report is to continue minimizing the usage of chlorine consistent with maintaining a suitable biofouling control of the intake cooling water system and maintaining a high condenser efficiency. The Chlorine Minimization Report i should include as a minimum:
l i
l Page 11 of 25 Permit No. NH0020338 ( (1) The seasonal chlorination cycle employed during the reporting period: the days the system was chlorinated, > the sodium hypochlorite dosage level, the experimentally determined marine water chlorine demand, the TRO reported in the Discharge Transition Structure, ' the report on the bioloaical monitoring plates in the Intake cooling water system, and the results of any inspections of the Intake Structures by divers or robots. l (2) Annually, the permittee may propose long-term changes in the chlorination seasonal dosage rates. These proposed changes with their justification are to be included in the annual review of the biological and hydrological data by the Technical Advisory Committee ' (TAC), Par. I.A.10.b below. The proposed chlorination plan shall be implemented only after the acceptance by the TAC and approval of the Regional Administrator and the Director. The permittee may propose changes in the approved seasonal chlorination rates to the Regional Administrator and the Director at any time to accommodate sudden changes in the biological activity of the marine waters which may immediately affect plant condenser efficiency or the Cooling Water System biological fouling. At no time shall the concentration of TRO exceed 0.15 mg/l at the Discharge Transition Structure, Par. I.A.2.a. (3) The permittee shall report on the likelihood that the thermal backflushing operation will be needed to compliment the continuous chlorination program in the ensuing year (frequency and reason for the backflushing). (4) The data developed for this report shall be incorporated into the statistical hydrological and , biological data base for future operational data l comparison. ! i. All material removed from the rotating screens in the cooling water intake system shall not be returned to the receiving waters.
- j. The discharge of radioactive materials shall be in accordance with the Nuclear Regulatory Commission requirements (10 CFR 20 and the Seabrook Station Technical Specifications).
- k. The permittee shall conduct a Thermal, Biological, Hydrological and Chlorination Monitoring Program in accordance with Paragraphs I.A.1.j, I.A.2.h, and I.A.10.
Page 12 of 25 l Permit No. NH0020338 , i i 1. The permittee shall perform chronic toxicity tests following l the protocol in Attachment A (dated July 1991) on 24-hour i composite effluent samples collected during January 1994 and July 1994. The species for this test is the Inland , Silverside (Menidia bervilina). Chronic and acute toxicity data shall be reported as required in Attachment A. Results of these toxicity tests are to be submmitted as follows: January sampling results due by June 15th and the July sampling results due by September 15th. This permit shall be modified, or alternatively, revoked and reissued to incorporate additional toxicity testing requirement and to include limits if the results of these toxicity tests indicate this discharge causes an exceedance of any water i quality criteria. ; I s 1 i l l l I l i
. ,- c.
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L Page 13 of 25 Permit No. N110020338 Part I
- 3. During the period beginning the Effective Date and lastiry through the Diversion Date*, the pemittee is authorized to discharge from cutfall(s) serial number (s) 002A, Settlity Basin Discharge ( Cmbined flw j of: stom water runoff ard treated sanitary waste) .
- a. Such discharges shall be limited and monitored by the pemittee as specified below:
4 1 Effluent 01aracteristic Dischame Limitations Monitorim Reauirments i Measurement Sanple ! Aver. Monthly Max. Daily Preauency Tvoe Flw , MGD Report 41.5 Continuous Reconler Total Susperded Solids, mg/l 30 100 Weekly Grab ! Oil aid Grease, mg/l 15 20 Weekly Grab '
% 7btal Residual 011orine, TRC, ng/1** 0.0075 0.013 Weekly Grab pII, s.u . 6.5 8.0 1/ day Grab "T1 q
- The " Diversion Date" is the date that Discharge 002A to the Browns River is terminated ard all
- point sources to the Browns River cease. See Paragraph I.A.1.n. The diverted combined stream
! of treated sanitary wastes and stormwater will be designatcd as Discharge 002B and will be sampled prior to entering the Circulating Water System. 1 ** Note: TRC protocol is presented in Par. I.A.2.f for the prescribed succddre ard Detection Limit. i b. The pil shall not be less than 6.5 standani units nor greater than 8.0 standard units or as naturally i cxxurs in the receiving waters, Par. I.E.1.a. The pli shall be monitored weekly by a grab sanple.
- c. 7here shall be no visible discharge of floating solids or foam.
- d. Samples taken in compliance with the monitoring requirements above shall be taken
- before Diversion
- Date at the point of discharge into the Browns River.
s
- e. Total Residual Oxidants shall be tested using the Amperometric Titration Method, Method 4500-CL E in Standard Methods for the Examination of Water and Wastewater,17th Diltion dated 1989 or Method 330.5 in the EPA Manual of Methods of Analysis of Water and Wastes. Any 7PD value below 0.05 mg/l or 50 ug/l will be reported as a non-detect. For this pemit the Minimum Invel (ML) [the minimum practical detection level] for 7btal Residual Oxidants has been defined as 0.05 ng/l (50 ug/1) and that value may be reduced as more sensitive test methods are approved by the EPA and the State.
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Page 14 of 25 Pemit No. NH0020338 Part I
- 4. During the period beginning the Diversion Date* arxl lasting through the Expiration Date, the permittee is authorized to discharge from outfall(s) serial number (s) 0028, Junction Box Wet Weather Discharge (Combined flow of: storm water runoff during a storm event, treated sanitary waste arri secorriary plant leakage),
- a. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristic Discharrie Limitations Monitorim Rcriuirements Measurunent Sample Avo. Monthly Max. Daily Freauency Two Flow, MGD -- 41.5 2/ Annually ** Estimate (2-year 24-hour storm) Total Suspended Solids, mg/l 30 100 2/ Annually Grab Oil and Grease, mg/l 15 20 2/ Annually Grab
- The " Diversion Date" is the date that Discharge 002A to the Browns River is terminated and all
] point sources to the Browns River cease. See Paragraph I.A.l.n. The diverted combined stream of treated sanitary wastes and storm water will be designated as Discharge 002B and will be
- q t.
v sampicd prior to entering the circulating Water System. D ** Wet weather samples shall be taken twice cach year during the 1st hour of a significant storm event in the months of April and October or in the succeeding months should no significant L. ,I 1 storm events oxur during the designated months. All storm water runoff samples will be
- d collected from a storm event that is greater than 0.1 inches in magnitude arxl that occurs at least 72 hours from the previously measurable (greater than 0.1 inch rainfall) storm event.
(Note: 1 inch storm event runoff is approximately 1 million gallons of water from the plant site.)
- b. The pil shall not be less than 6.0 standatti units nor greater than 9.0 standard units or as naturally occurs due to acid rain, etc. The pli shall be monitored twice annually by a grab sarple.
- c. There shall be no discharge floating solids or visible foam in other than trace amounts.
- d. Samples taken in complian with the monitoring requirements above shall be taken after the Diversion Date at the point of discharge into Circulating Water System.
Page 15 of 25 Permit No. NH0020338 Part I
- 5. During the period beginnin] Effective Date and lasting through Expiration Date, the permittee is authorized to discharge from outfall(s) serial number (s) 021, Treatal Sanitary Waste.
- a. Such dischanyes shall be limited and monitored by the permittee as specified below:
Effluent diaracteristic Dischame Limitations Monitorim Reauirements Average Average Maximum Measurement sample lionthly Weekly Daily Frecuencv* Type Flow, gpd Ecport - 50,000 Cbntinuous Reconfer DoD, mg/l 30 - 50 Weekly 24-hr composite TSS, rg/l 30 -- 50 Weekly 24-hr Cbmposite Total Residual 011orine, mg/l -- - 5.0 Daily when Grab l[j in use y oil and Grease Observation No Sheen Visible Daily Observation v p Total coliform, #/100 ml 70 - 70 Weekly Grab N Total Metals, Sludge, ng/l** - - - Upon Disposal ** Grab m,j pH, s.u. 6.5 - 8.0 Weekly Grab
- Samples will be taken when the treatment plant is operation since this facility is typically operated on a 5 day / week basis.
** See Paragraph I. C. for details defining sludge sampling, analysis, and reporting.
- b. The pit shall not be less than 6.5 standard units nor greater than 8.0 standini units or as naturally occurs in the receiving waters, Par. I.E.1.a. The pH shall be mor;itoral weekly by a grab sample.
- c. There shall be no discharge of floating solids or visible foam in other than tram amounts.
- d. Samples are taken in corpliance with the monitoring requirements specified above shall be taken at any representative point prior to mixing with any other stream: (1) into the primary settlity basin prior to Diversion Date and (2) into the Circulating Cooling Water Discinrge Ibnnel, Discharge 001, after Diversion Date.
u
Page 16 of 25 tbruit No. 1810020338 Part I
- 6. During the period beginning Effective Date and lasting through Expiration Date, the permittee is 1 l authorized to discharge from outfall(s) serials number (s) 022, Secondary Plant Inakage Vault #1, 023 ,
- Secondary Plant Inakage, Vault #2, 024, Secondary Plant Inakage, Vault #3.
i
- a. Such discharges chall be limited and monitored by the permittee as specified below:
i Effluent diaracteristic Dischame Limitations Monitorim Reauirements Measurement- Sanple Avrt. Monthly Max. Daily Precuency Tyne I Flow, gpd Report Report Monthly Estimate ; Oil and Grease, mg/l 15 20 Weekly when Grab in use Total Suspended Solids ('ISS), ng/l 30 100 Weekly when Grab in use Q
,y
- b. 'Ihe samples taken in cmpliance with the monitoring requirements specified above shall be.taken at a representative point prior to mixing with any other stream.
r" *u i I' i) 4 l *' ' ' "d ; I r b a- e .i 3 i i .s I I
4 Page 17 of 25 Permit tio. NII0020338 Part I
- 7. During the period beginning Effective Date and lastiry thtngh Expiration Date, the permittee is authorized to discharge from outfall(s) serial number (s) 025, Liquid Waste Distillate and Steam Generator Blowdown and Recovery Regeneration Sump neutralized waste.
- a. Such discharges shall be limited arxl monitored by the pennittee as specified below:
Effluent G aracteristic Dischame Limitations Monitorim Recruirements Meam m t Sample Avg. Monthly tbx. Wily Frequency Type Flow, gpd Report 300,000 Eadt batch or Estimate Continuous
- Oil and Grease, mg/l 15 20 Once prior to Grab batch discharge or
(,,) Weekly
- rs-
#*'y Once prior to Total Suspended Solids ('ISS), ng/l 30 100 Grab batd1 discharge or q; weckly*
Radioactivity (See Sulparagraph "c" below and Par. I.E.1.b)
- tionnally this outfall has a batch discharge; however, it is possible that an infrequent continuous blowdown may be necessary to control the chemical parameters. 'Ibe sanpling frequency reflects this change in operation.
- b. Samples taken in compliance with the monitoring requirements specified above shall be taken at a representative point prior to mixing with any other stream.
- c. 'Ihe disctntge of radioactive materials shall be in accordance with the rcquirements of the 1Alclear Regulator Commission, (10 CFR 20 and the Seabrook Station Technical Sp2cifications) .
Page 18 of 25 Permit No. NH0020338 Part I
- 8. During the period beginning Effective Date and lasting through Expiration Date, the permittee is authorized to discharge from outfall(s) serial number (s) 026, 01cmical Cleaning Wastes from stationary or portable treatment facilities,
- a. Such discharges shall be limited an1 monitored by the permittee as specified below:
Effluent diaracteristic Dischame Limitations Monitorim Reauirements Measurement Sanple Avu. Monthly Max. Daily Frecuency Type Flow, gpd Report Report 1/Datch Estimate Oil and Grease, mg/l 15 20 1/ Batch Grab (bpper, mg/l 1.0 1.0 1/Datd1 Grab Iron, ng/l 1.0 1.0 1/Datch Grab i[i Total Surpended Solids (TSS), mg/l 30 100 1/Datch Grab sso t
- Sample frequency is once per batch prior to release when treated chemical cleaning waste is
- r. -
beirg discharged from either stationary or portable holding tanks. l 93 erw] b. 'Ihe pH shall not be less than 6.0 standarti units nor greater than 9.0 standard units prior to each batch discharge.
- c. A minimum of one Circulating Water System circulation pump shall be in operation when the Treated 01cmical Cleaning Wastes are discharged.
- d. 'Ibe samples taken in atmpliance with the monitoring requirements specified above shall be taken at a representative point from staticaary or portable holding tanks and prior to mixing with any other stream. 'Ihe ultimate discharge shall be through the Circulating Cooling Water System Discharge, Diem e 001.
- c. 'Ihe permittee shall notify the Regional Administrator and the Director at least 72 hours prior to any chemical c1 caning operations and provide an estimate of the duration of the operation, the chemicals to be used, and the point or location of wastewater release into the discW tunnel.
--r--- --_-.__.--.m ,.,-.,....w. ~. . . , . . ...-_,myymm,, ,, , ,, ,, _ ,,
! Page 19 of 25 I Permit No. M110020338 j Part I
- 9. During the period beginning Effective Date and lasting thrtnJh Expiration Date, the pennittee is authorized to discharge from outfall(s) serial number (s) 027, Auxiliary Cooling 'Ibwer Blowdown,
- a. Such discharTjes shall be limite11 and monitored by the Irdttee as specified below:
Effluent OTaracteristic Discharne Limitations Monitorim Reauirements Measurement Sample Avrt. Monthlv Max._Dai1y Frmuency 'INTm Flow, gpd Report Peport Daily
- Estimate Free Available 011orine (FAC), ng/l 0.2 0.5 Daily
- Grab
- Sample frequency is on daily when Auxiliary Cooling Tower las a blowdown.
"I b. '1he pH shall not be less than 6.0 standard units nor greater than 9.0 standani units and shall be sampled daily when in use.
' , c. None of the 126 priority pollutants shall be used for cooling tower maintenance chemicals.
) d. We samples taken in compliance with the monitoring requirements specified above shall be taken at a i representative point prior to mixing with any other stream.
.___ ___ __ _____ _____ _ _ ___ _ ____ _ _ _ _ _ __ _ _ _ _ _ ~.__ _____ _. _ _ _ .____ -- _ _ . . . . _ _
Page 20 of 25 Permit No. NII0020338 Part I
- 10. During the period beginning Effective Date arti lastirn through Expiration Date, the perinittee is authorized to dischanye from outfall(s) serial number (s) 003, 'Ihermal Back-flushiry Operation for biofouling control of the intake water system.*
- a. Such discharges shall be limited arti monitored by the permittee as specified belw:
Effluent Characteristic Discharue Limitations Monitorirrt Recuirements Measurement Sample Avrt. Monthly Max. Daily Frcouency Tvoo Fl m-gpm Report 500,000 When in use Estimate ** Temperature, Maximum (Tg)F Report 120 Continuous Pimrtling when in use Max. Temp.
- In the inck-flushiry operation, the diffuser serves as the intake and the intake structure is the dischattJe point.
** Flw rate may be estimated from pump curves.
- b. The pit shall not be less than 6.5 standani units nor greater than 8.0 standard units or as naturally occurs in the receiving water, Par. 1.E.1.a (Sampling not required.)
,1 c. 'Ihere shall be no discharge of a oil sheen, foam, or floating solids in the vicinity of the intake ports. Naturally occurring sea foam in the intake transition struction is allowed.
- d. The cont]nucus back-flushing flw shall not exceed 120 F maximum and the duration at the maximum
'f, ' temperature shall not exceed 2 hours. 'Ihe total back-flushing cycle may not exceed 6 hours. The
~t thermal plume which arises from the back-flushi1U operation shall have minimum impingement upon the Int'er and Outer Sunk Rocks, in accordance with paragraph I. A.1.j. (1) .
- e. '1he r>ermittee shall not conduct more than 4 back-flushing cycles per caleniar year unless prior approval is obtained from the Regional Administrator and the Director,
- f. 'Ihere shall be no chlorination operations during the thennl backflushing process except for safety related functions, i.e.: Service Water System Chlorination.
- g. The permittee shall include in the monthly subnittal of the Discharge Monitoring Report each time Discharge 003 is used giving the date, maximum temperature achieved, arxl duration of each back-flushing operation.
- h. A study plan for alternatives to therml backflushing shall be made in accortlance with Par.
I.A.j. (8) of this perinit. This study shall subnitted to EPA, the State arx1 the TAC before the selected alternative is used to control the sessile organisms in the Intake Tunnel or by January 1, 1995, whichever comes first.
L Page 21 of 25
. Permit No. NH0020338
- 10. Biological, Hydrological, and Chlorination Monitoring Programs
. a. The Biological, Hydrological, and Chlorination , Plan approved for 1992 is an enforceable element i of this permit.
- b. A Technical Advisory Committee (TAC) shall be '
organized to formalize the group of Federal and State biologists that have been coordinating, reviewing, and commentino upon the Pre-Operational and Operational biological, hydrological, and chlorination programs at seabrook Station since 1976. The committee members shall be competent biologists from the following Federal and State , regulatory agencies: NHDES, NHF&GD, USNMFS, and USEPA. North Atlantic Energy Service, the . permittee, is a non-voting member of the TAC.
- c. The TAC may accept, reject, or modify any program !
or schedule proposed by the permittee. After i acceptance of the program and schedule by the TAC, j the permittee will then submit the programs to the Regional Administrator and the Director for their i approval. Upon approval, the proposed program and ! schedule becomes an enforceable element of this permit. I
- d. Annually, after the effective date of this permit, the permittee may propose changes to the approved biological, hydrological and chlorination programs to the Regional Administrator and the Director. A proposed modified program for the calendar year of -
1994 must be submitted prior to January 1, 1994, ! for review and acceptance by the TAC. After the ! TAC acceptance and upon approval by the Regional i Administrator and Director, the proposed program will become an enforceable element of this permit. During unusual biological, climatological, or hydrological conditions, the permittee may recommend at any time that these programs be modified on an emergency basis to ensure stable operation of the facility.
- e. The biological, hydrological, and chlorination study reports shall be submitted on a semi-annual basis with the annual report summarizing the previous year's information and conclusions :
(December).
~~
, - - , The semi-annual mid-year report (June) shall be a i letter report providing the status of the on-going programs, the expected effort in the ensuing six months, and a synopsis of the data and information obtained since the last annual report. This letter shall give special emphasis in alerting tha
I Page 22 of 25 Permit No. NH0020338 . TAC of any detected anomalies that would suggest I immediate consideration or investigation.
- f. During operation of Seabrook Station, the permittee shall conduct such studies as are ;
determined by the Regional Administrator and the f Director to be necessary to evaluate the accuracy of the thermal plume predictions it has submitted to EPA in support of the NPDES Permit Application No. NH0020338 for both normal operation and thermal back-flushing operations. ,
- g. Fish Mortality Monitoring and Reporting. ,
l Any incidence of fish nortality associated with , the discharge plume or of unusual number of fish ! impinged on the Intake Traveling Screens shall be reported to the Regional Administrator and the Director within 24 hours by telephone report as l required in Paragraph II.D.1.e of this permit. A written confirmation report is to be provided ! within five (5) days. This report should include l the following: l l (1) The kinds, sizes, and approximate number of I' fish involved in the incident. (2) The time, date, and duration of the j occurrence. l (3) The operating mode of the station at the time of the occurrence. j (4) The opinion of the permittee as to the cause l of the incident. < (5) The remedial action that the permittee will undertake to prevent a recurrence of the incident. B. SCHEDULE OF COMPLIANCE
- 1. The permittee shall notify the Regional Administrator and the Director 30 days prior to the date that any treated sanitary waste (Discharge 021) and/or the storm water discharges are diverted to the cooling water discharge through the a manhole in the Circulating Water System, Discharge 001. l l
- 2. The permittee shall notify the Regional Administrator and the Director 30 days prior to the " Diversion Date",
the date that the flow from Discharge 002 into the Browns River is terminated.
_ _. _. _. ~ . _ _ _ _ _ _ l Page 23 of 25 ' - Permit No. NH0020338 C. SLUDGE CONDITIONS l All treatment works treating domestic sewage are required to have conditions which implement the technical sludge standards required by Section 405(d) of the Clean Water Act. The conditions require the following: l
- 1. The permittee shall comply with all existing Federal and State laws and regulations that apply to sewage sludge use and disposal practices and with the Section 405 (d) of the Clean Water Act (CWA) technical standards when promulgated.
If an applicable management practice or numerical limitation for pollutants in sewage sludge more stringent than existing Federal and State regulations is promulgated under Section 405 (d) of the CWA, the permittee shall comply with the new requirements no later than the compliance specified in the applicable regulations as required by Section 405 (d) of the CWA.
- 2. The permittee shall give prior notice to the Regional
-Administrator and the Director of any change (s) planned in the permittee's sludge use or disposal practice.
- 3. A change in the. permittee's sludge use or disposal practice is a cause for modification of the permit. It is a cause for revocation and reissuance of the permit -
if the permittee requests or agrees.
- 4. The permittee shall monitor the sludge prior to ultimate disposal for the following pollutants (total metals): copper, cadmium, chromium, lead, nickel and zinc. The results shall be submitted with the appropriate monthly DMR.
D. STORM WATER POLLUTION PREVENTION PLAN (SWPPP) The permittee shall develop and implement a' Storm Water Pollution Prevention Plan (SWPPP) no later than 180 days after the oermit's effective date. The SWPPP shall identify all potential sources of pollution which may reasonably be expected to affect the quality of storm water discharges associated with industrial activity from this steam electric power plant. In addition, the SWPPP shall describe and { ensure the implementation of practices which are to be used l to reduce the pollutants in storm water discharge associated j with industrial activity at this facility and to assure compliance with the terms and conditions of this permit. Attachment B provides the " Generalized Instructions for the Preparation of Storm Water Pollution Plans (SWPPP)" to be utilized for Seabrook Station as appropriate and applicable. I i
I Page 24 of 25 Permit No.NH0020338 . E. MONITORING AND REPORTING ! i
- 1. Reporting Monitoring results obtained during the previous month shall be summarized and reported on Discharge <
i Monitoring Report Form (s) postmarked no later than the 15th day of the month following the completed reporting ! period. ! ! I i Duplicate signed copies of these, and all other reports ! l required herein, shall be submitted to the Regional Administrator and one signed ccpy to the State at the following addresses: ; l Environmental Protection Agency i l NPDES Program Operation Section P. O. Box 8127 l Boston, MA 02114 ; l The State Agency is: ) l New Hampshire DES l Water Supply & Pollution Control Division Permits and Compliance Section , 6 Hazen Drive, P.O. Box 95 l Concord, New Hampshire 03301 l E. State Industrial Permit Conditions I
- 1. The permittee shall comply with the following ,
conditions which are included as State Certification l requirements: i
- a. "The pH for Class B waters is 6.5 to 8.0 s.u. or l as naturally occurs in the receiving water. The 6.5 to 8.0 s.u. range must be achieved in the final effluent unless the permittee can
, demonstrate to the Division: (1) that the range l l should be widened due to naturally occurring l l conditions in the receiving water or (2) that the l naturally occurring source water pH is unaltered l by the permittee's operations. The scope of any 1 demonstration project must receive prior approval j from the Division. In no case shall the above ! procedure result in pH limits less restrictive than any applicable federal effluent limitation guidelines."
- b. "The permittee shall submit the Executive Summary and Section D (Surface Water) of the Seabrook l Station Annual Radiological Environmental l Operating Report to NH DES at the address in Par. I.D.1 and to all members of the Technical Advisory Committee (TAC) within 30 days of preparation."
1 I
Page 25 of 25 Permit No.NH0020338
- 2. This NPDES Discharge Permit is issued by the U.S.
Environmental Protection Agency (EPA) under Federal and State law. Upon final issuance by the federal EPA, the Water Supply and Pollution Control Division may adopt this permit, including all terms and conditions, as a state discharge permit pursuant to RSA 485-A:13. Each agency shall have the independent right to enforce the terms and conditions of this Permit. Any modification, suspension or revocation of this Permit shall be effective only with respect to the Agency taking such action, and shall not effect the validity or status of this Permit as issued by the other Agency, unless and until each Agency has concurred in writing with such modification, suspension or revocation. In the event any portion of this Permit is declared invalid, illegal or otherwise issued in violation of State law, such permit shall remain in full force and effect under Federal law as an NPDES permit issued by the U.S. Environmental Protection Agency. In the event this permit is declared invalid, illegal or otherwise issued in violation of Federal law, this Permit shall remain in full force and effect under State law as a Permit issued by the State of New Hampshire. i i t O#* @ d
- . . 8_ '. i l
1 l
, Permi'; No. NH0020338 7-27-93 NH20338.PE4 ATTACHMENT A Chronic (and Modified Acute) Toxicity Test Procedure and Protocol:
o Inland Silverside (Menidia bervilina) growth and survival test. I. GENERAL REQUIREMENTS The permittee shall conduct acceptable toxicity tests.in accordance with the appropriate test protocols described below. The permittee must collect discharge samples and perform the toxicity tests that are required by Part I of the NPDES permit. Chronic toxicity data shall be reported as outlined in Section VIII. II. TEST FREQUENCY AND SAMPLING REQUIREMENTS l See Part I of the NPDES permit for sampling location, sample type, test frequency, test species, and test date(s) requirements. Chain of Custody information should be provided for each sample tested. A chronic toxicity sampling event is defined as three discharge (composite or grab) samples collected over the seven-day period (see Section IV). III. METHODS l Methods to follow are those recommended by EPA in: I Weber, C.I., et al, 1988. Short Term Methods for Estimatina the
.Ohronic Toxicity of Effluents and Receivina Waters To Marine and Estuarine Orcanisms, Office of Research and Development, Cincinnati, OH. EPA /600/4-87/028.
Any exceptions are stated herein. IV. SAMPLE COLLECTION For each Lampling event, three discharge-samples shall be collected ove.T a 7-day exposure period. An initial sample (day
- 0) is used to start the test. The additional two samples are collected for use at the-start of day 3 and 5. Renewal of test concentrations is conducted daily with the most recently collected discharge sample. The initial (day 0) sample will be analyzed chemically. Day 3 and 5 samples will be held until test completion. If either the day 3 or 5 renewal sample is of (July 1991) 1
Permit No. NH0020338 . sufficient potency to cause lethality to 50 percent or more test organisms in any of the dilutions, then a chemical analysis shall , be performed on the appropriate sample (s) as well. Aliquots shall be split from the sample, containerized and i preserved (as per 40 CFR Part 136) for the chemical and physical analyses. The remaining sample shall be dechlorinated (if - necessary) in the laboratory using sodium thiosulfate for subsequent toxicity testing. Grab samples must be used for pH, , temperature, and total residual oxidants (as per 4 0 CFR Part 122.21). The Methods for Acuatic Toxicity Identification Evaluations I (Phase II, EPA /600/3-88/034, Section 8.7, provides detailed information regarding the use of sodium thiosulfate (i.e. dechlorination). All samples held overnight shall be refrigerated at 4 C. V. DILUTION WATER Dilution water used for toxicity analysis shall be collected at a point away from the discharge which is free from toxicity or other sources of contamination. When using receiving water as the dilution water an additional control (0% effluent), rade up from a laboratory water of known quality, will also be run. If the receiving water diluent is found to be, or suspected to be toxic or unreliable, an alternate or standard dilution water of known quality with a salinity, pH, conductivity, and total suspended solids similar to that of the receiving water may be substituted AFTER RECE27ING WRITTEN APPROVAL FROM THE PERMIT ISSUING AGENCY (S). It may prove beneficial to the permittee to have the proposed dilution water source screened for suitability prior to toxicity testing. For further information see Section 7, page 19 of EPA /600/4-87/028. Dilution water used for marine chronic toxicity shall be of sufficient quality to meet minimum acceptari*s af test results (see Section VI). k (July 1991) 2
Permit No. NH0020338 VI. REGION I RECOMMENDED TEST CONDITIONS FOR THE INLAND SILVERSIDE (Menidia beryllina) GROWTH AND SURVIVAL TESTI
- 1. Test type Static, renewal
- 2. Salinity 5 o/co TO 32 o/co i 2 o/co
- 3. Temperature 25 2C
- 4. Light quality Ambient laboratory light
- 5. Light intensity 10-20 uE/m 2 /s, or 50-100 ft-C (Ambient Laboratory Levels)
- 6. Photoperiod 16 hr light, 8 hr darkness
- 7. Test vessel size 300 - 1000 ml beakers or equivalent (glass test chambers should be used)
- 8. Test solution volume 250 ml minimum (loading and DO restrictions must be met)
- 9. Renewal of test solutions Daily using most recently collected sample.
- 10. Age of test organisms Seven to eleven days post hatch.
- 11. Larvae / test chamber 15 (minimum of 10)
- 12. Number of replicate chambers 4 (minimum of 3) per treatment
- 13. Source of food Newly hatched Artemia nauplii less than 24 hr old
- 14. Feeding regime Feed once a day 0.10 g wet wt Artemia nauplii per replicate ;
on days 0-2; feed 0.15 g wet l wt Artemia nauplii per { replicate on days 3-6 )
- 15. Cleaning Siphon daily, immediately before test solution renewal and feeding
- 16. Aeration 2 None (July 1991) 3
Permit No. NH0020338
- 17. Dilution water Uncontaminated source of natural seawater; or deionized water mixed with I hypersaline brine or equivalent artificial seawater.
- 18. Effluent concentrations 3 5 and a control. An
! additional effluent concentration (% effluent) is required. l 19. Dilution factor 0.5 + l 20. Test duration 7 days l
- 21. Effects measured Survival and growth (weight)
- 22. Acceptability of test The average survival of ,
control larvae is a minimum of 80%, and the average dry wt of t ! unpreserved control larvae is > l a minimum of 0.5 mg, or the average dry wt of preserved control larvae is a minimum of l 0.43 mg.
- 23. Sampling requirements For on-site tests, samples are l collected daily and used within 24 hours of the time ,
they are removed from the ( sampling device. For off-site tests, samples must be first ; used within 48 hours of l collection. 1 1
- 24. Sample Volume Required Minimum of 5' liters.
Footnotes: I Adapted from EPA /600/4-87/028. l 2 If DO falls below 60% of saturation, aerate all chambers at j a rate of less than 100 bubbles / min. Routine DO checks are i recommended. 3 When receiving water is used for dilution an additional control made up of standard dilution water (0% effluent) is required. i (July 1991) 4
l Permit No. NH0020338 VII. CHEMICAL ANALYSIS The following chemical analyses shall be performed for each sampling event. Minimum Detection Parameter Effluent Diluent Limit (ma/L) pH x x --- Specific Conductance x x --- Salinity x x PPT (o/oo) Total Residual Oxidantsl x x 0.02 Total Solids and suspended Solids x x --- AmI: tonia x x 0.1 Total Organic Carbon x x 0.5 l l Total Metals ' l l Cd x 0.01 Cr, Ni x 0.05 Pb, 2n, Cu x 0.01 Al x 0.02 t In addition, the following chemical analyses shall be performed I as part of each daily renewal procedure on each dilution and the controls. Beginning of 24-hr End of 24-hr Parameter Exposure Period Exposure Period i Dissolved Oxygen x x Temperature x pH x Specific Conductance x Superscript: 1 Total Residual Oxidants Methods: either of the following methods from the 16th i l Edition of the APHA (1985) Standard Methods for the Examination of Water and Wastewater must be used for these i analyses: Method 408-C (A::perometric Titration Method)-the preferred method; Method 408-D (Ferrous Titrimetric Method). l l (July 1991) 5 l I
)
4 Permit No. NH0020338 . VIII. TOXICITY TEST REPORT ELEMENTS , A report of results will include the following: ' Description of sample collection procedures, site description; Names of individuals collecting and transporting samples, times and dates of sample collection and analysis; and General description of tests: age of test organisms, origin, dates and results of standard toxicant tests; light and temperature regime; other internation on test conditions if different than procedures recommended. Toxicity test data shall include the following: Chronic Daily survival of test organisms in the controls and all j replicates in each dilution. ' Chronic test data shall undergo hypothesis testing to determine if the distribution of results is normal using the Shapiro-Wilks test. The variance must also be tested for homogeneity using Bartlett's Test. Then the endpoint estimates, NOEC and LOEC must be determined using Dunnett's Procedure, Bonferroni's T-Test, Steel's Many-One Rank Test, or Wilcoxon Rank Sum Test with Bonferroni adjustment. The choice of test depends on the number of replicates and whether the variance is homogeneous or not. See I EPA /600/4-87/028 for details. All printouts and graphical l displays must be submitted. 1 C-NOEC: Chronic No Observed Effect Concentration. l LOEC: Lowest Observed Effect Concentration. l MATC: Maximum Allowable Toxicant Concentration. i All chemical / physical data generated (include detection ; limits). 1 Raw data and bench sheets. (See sample data sheets pp. 8-11.) Any other observations and test conditions that may have affected the outcome of the test. l Acute ' Survival for each concentration and replication at time 24, and 48 hours. LC50 and 95% confidence limits shall be calculated using one of the following methods in order of preference Probit, ; Trimmed Spearman Karber, Moving Average Angle, or the graphical method. All printouts (along with the name of the program, the date, and the author (s)) and graphical displays must be submitted. When data is analyzed by hand, i worksheets should be submitted. The Probit, Trimmed Spearman Karber, and Moving Average l Angle methods of analyses can only be used when mortality of some of the test organisms are observed in at least two of (July 1991) 6
Permit No. NH0020338 I the (% effluent) concentrations rested (i.e. partial l mortality). If a test results in a 100% survival and 100% mortality in adjacent treatments ("all or nothing" l effect), a LC50 may be estimated using the graphical method. All chemical data / physical generated (include detection limits). Raw data and bench sheets. Any other observations or test conditions affecting test outcome. IX. REPORTING Signed copies of the toxicity testing reports shall be submitted as required by Part I of the permit. , Any exceptions are stated herein. i l 1 (July 1991) 7 i r,-
Permit No. NH0020338 E xArMr'LG Data forms for inland silverside larval survival and growth test. Daily record of larval survival and test conditions. (> 7 Test Dates: Species- ;
- Type Ef fluent: reeld Lab Test w
i
- Elfluent Tested CONCENTRATION:
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- RE PLICAT E:
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j Permit No. ND320338 Data forms for inland silverside larval survival and growth test. Dry weights of larvae. Test Dates: Species: Pan Conc. Initial Final p Av. Wt>
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# LIVE LARVAE SURVIVAL
(%) MEAN DRY WT./ LARVAE (mg)
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SIGNIF. DIFF. FROM CONTROL (0) MEAN TEMPERATURE (oC) S.D. MEAN SALINITY 0/00 S.D. AV. DISSOLVED OXYGEN , (mg./L) ! S.O. COMMENTS: d I i l 11 tJa!; 199:
l Attachment B ! Pe'rmit No. NHOO20338 7-27-93 Attachment B NH20338.PE3 Generalized Instructions j Preparation of Storm Water Pollution Prevention Plan (SWPPP) (March 1993) J Contents l SECTION A. DEADLINES FOR PLAN PREPARATION AND COMPLIANCE i SECTION B. SIGNATURE AND PLAN REVIEW ; 1 SECTION C. KEEPING PLANS CURRENT j SECTION D. CONTENTS OF PLAN !
- 1. Pollution Prevention Team
- 2. Description of Potential Pollutant Sources
- a. Drainage
- b. Inventory of Exposed Materials
- c. Spills and Leaks
, d. Sampling Data
- e. Risk Identification and Summary of Potential Pollutant Sources
- 3. Measures and Controls
- a. Good Housekseping :
- b. Preventive Maintenance
- c. Spill Prevention and Response Procedures
- d. Inspections
- e. Employee Training
- f. Record-keeping and Internal Reporting Procedures
- g. Non-Storm Water Discharges -
- h. Sediment and Erosion Control
- i. Management of Runoff
- 4. Comprehensive Site Compliance Evaluation
- a. Visual Inspection
- b. Plan Revision '
- c. Inspection Report
- d. Inactive Mining
- 5. Consistency with Other Plans
- 6. Additional Requirements for Storm Water Discharges through Municipal Separate Storm Sewer Systems serving l a Population of 100,000 or more i 1
- 7. Additional Requirements for Storm Water Discharges from Facilities subject to Emergency Planning and Community Right-to-Know Act (EPCRA) Section 313 Requirements
- 8. Additional Requirements for Salt Storage 1
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Attachment B - 4 1 , Attachment C : 4 Generalized Instructions i j Preparation of Storm Water Pollution Prevention Plans (SWPPP) ; i (March 1993) , Preface i A Storm Water Pollution Prevention Plan (SWPPP) shall be developed for this facility. The Storm Water Pollution l Prevention Plan shall be prepared in accordance with good ' , engineering practices and in accordance with the factors outlined in 40 CFR 125.3(d) (2) or (3) as appropriate. The plan shall identify potential sources of pollution which may reasonably be , expected to affect the quality of storm water discharges associated with industrial activity from the facility. In - addition, the plan shall deceribe and ensure the implementation i of practices which are to be used to reduce the pollutants in storm water discharges assoc:iated with industrial activity at the , facility and to assure compliance with the terms and conditions of this permit. The. permittee must implement the provisions of the Storm Water Pollution Prevention Plan required under this part as a condition of this permit. i, This attachment provides the " Generalized SWPPP Instructions"for
- developing a SWPPP for any facility. Therefore, the SWPPP
! developed for a specific facility shall contain only those i elements which are applicable'and appropr.iate to the plant and !
site under consideration. A. Deadlines for Plan Preparation and Compliance I 1. The SWPPP for this facility shall be prepared, and ! except as provided elsewhere in this permit, shall l provide for compliance with the terms of the permit and ; the plan, no later than 180 days after the effective date of the permit. i
- 2. Upon a showing of good cause, the Regional l Administrator (RA) may establish, in writing, a later !
date for preparing and compliance with a plan for a . storm water discharge associated with_ industrial ! activity. l B. Sicnature and Plan Review
- 1. The plan shall be signed in accordance with Part II )
D.3. (Signatory Requirement) and be retained on-site at-the~ facility in accordance with ;' art II.C.1.b. ]' d (Monitoring and Records) of this permit.
- 2. The permittee shall make plans available upon request to the RA, or authorized representative, or in the case of a storm water discharge associated with industrial 2
I i t I
. Attachment B activity which discharges through a municipal separate !
storm sewer system, to the operator of the municipal l system.
- 3. The RA, or authorized representative, may notify the f permittee at any time that the plan does not meet one or more of the minimum requirements.of this Part. Such notification shall identify'.those provisions of the l permit which are not being met by the plan, and l identify which provisions of the plan require t modifications in order to meet the minimum requirements !
of this Part. Within 30 days of such notification from the RA, (or as otherwise provided by the RA), or ; authorized representative, the permittee shall make the ! required. changes to the plan and shall submit to the RA i a written certification that the requested changes have
- been made. ;
C. Keepina Plans Current ! The permittee shall amend the plan whenever there is a l change in design, construction, operation, or maintenance, which has a significant effect on the potential for the discharge of pollutants to the waters ; of the United States or if the Storm Water Pollution - Prevention Plan proves to be ineffective in eliminating or significantly minimizing pollutants from sources identified under Section D.2 of this attachment (Description of Potential Pollutant Sources), or in , otherwise achieving the general objectives of ! controlling pollutants in storm water discharges l associated with industrial activity. Amendments to the .j plan may be reviewed by EPA in the same manner as Section C of this attachment (above). I l D. Contents of Plan i The plan shall include, at a minimum, the following items:
- 1. Pollution Prevention Team: Each plan shall identify a specific individual or individuals within the facility l organization as members of a Storm Water Pollution i
Prevention. Team who are responsible for developing the Storm Water Pollution Prevention Plan and assisting the facility or plant manager in its implementation,
~
maintenance, and revision. The plan shall clearly , identify the responsibilities of each team member. The j activities and responsibilities of the team shall address all aspects of the facility's Storm Water Pollution Prevention Plan. I 2. Description of Potential Pollutant Sources: Each plan shall provide a description of potential sources which may reasonably be expected to add significant amounts 3
. - - . , ._. -. - -. - . . - . - . - -. A.
Attachment B of pollutants to storm water discharges or which may result in the discharge of pollutants during any dry weather from separate storm sewers draining the facility. Each plan shall identify all activities and significant materials which may be potentially significant pollutant sources. Each plan shall include, at a minimum:
- a. Drainace:
(1) A site map indicating an outline of the portions of the drainage area of each storm water outfall that are within the. facility boundaries, each existing structural control measure to reduce pollutants in storm water runoff, surface water bodies, locations where significant materials are exposed to precipitation, locations where major spills or leaks identified under Section D.2.c of this attachment (Spills and Leaks) have occurred, and the locations of the following activities where such activities are exposed to precipitation: fueling stations, vehicle l and equipment maintenance and/or cleaning ! areas, loading / unloading areas, locations ; used for the treatment, storage or disposal t of wastes, liquid storage tanks, processing I areas and storage areas. l (2) For each area of the facility that generates , storm water discharges associated with ' industrial activity with a reasonable potential for containing significant amounts of pollutants, a prediction of the direction of flow, and an identification of the types of pollutants which are likely to be present in storm water discharges associated with industrial activity. Factors to consider include the. toxicity of chemicals; quantity of chemicals used, produced or discharged; the likelihood of contact with storm water; and history of significant leaks or spills of toxic or hazardous pollutants. Flows with a significant potential for causing erosion shall be identified.
- b. Inventory of Exposed Materials: An inventory of the types of materials handled at the site that potentially may be exposed to precipitation. Such inventory shall include a narrative description of significant materials that have been handled, treated, stored or disposed in a manner to allow exposure to storm water between the time of, three years prior to the date of the issuance of this 4
. Attachment B permit and the present; method and location of !
on-site storage or disposal; materials management practices employed to minimize contact of materials with storm water runoff between the time < of, three years prior to the date of the issuance ! of this permit and the present; the location and i description.of existing structural and , non-structural control measures to reduce ' pollutants in storm water runoff; and a description of any treatment the storm water receives.
- c. Spills and Leaks: A list of significant spills ,
and.significant leaks of toxic or hazardous pollutants that occurred at areas that are exposed-to precipitation or that otherwise drain to a ; storm water conveyance at the facility after the ' date of three years prior to the effective date of this permit. Such a list shall be updated as i appropriate during the term of the permit. I
- d. Samolino Data: A summary of existing discharge [
sampling data describing pollutants in storm water j discharges from the facility, including a summary of sampling data collected during the term of this ! permit.
- e. Risk Identification and Summary of Potential Pollutant Sources: A narrative description of the !
potential pollutant sources from the following ! activities: loading and unloading operations; outdoor storage activities; outdoor manufacturing or processing activities; significant dust or particulate generating processes; and on-site waste disposal practices. The description shall specifically list any significant potential source ; of pollutants at the site and for each potential ' source, any pollutant or pollutant parameter (e.g. biochemical oxygen demand, etc.) of concern shall be identified.
- 3. Measures and Controls: Each facility covered by this permit shall develop a description of storm water management controls appropriate for the facility, and implement such controls. The appropriateness and priorities of controls in a plan shall' reflect identified potential sources of pollutants at the facility. The description of storm water' management l controls shall address the following minimum
! components, including a schedule for implementing such controls:
- a. Good Housekeepino: Good housekeeping requires the maintenance of areas, which may contribute 5
L _ _ _ . , . _ , . _ . . -_ - --
Attachment B - pollutants to storm waters discharges, in a clean, orderly manner.
- b. Preventive Maintenance: A preventive maintenance j program shall involve timely inspection and maintenance of storm water management devices e.g.
cleaning oil / water separators, catch basins) as well as inspecting and testing facility equipment l and systems to uncover conditions that could cause breakdowns or failures resulting in discharges of pollutants to surface waters, and ensuring appropriate maintenance of such equipment and systems,
- c. Epill Prevention and Response Procedures: Areas where potential spills, which can contribute pollutants to storm water discharges, can occur and their accompanying drainage points shall be identified clearly in the Storm Water Pollution Prevention Plan. Where appropriate, specifying i material handling procedures, storage requirements, and use of equipment such as diversion valves in the plan should be considered. ,
Procedures for cleaning up spills shall be i identified in the plan and made available to the , appropriate personnel. The necessary equipment to l implement a clean up should be available to I personnel.
- d. Inspections: In addition to or as part of the comprehensive site evaluation required under Section D.4 of this attachment, qualified facility personnel shall be identified to inspect designated equipment and areas of the facility at i appropriate intervals specified'in the plan. A set )
of tracking or follow-up procedures shall be used l to ensure that appropriate actions are taken in response to the inspections. Records of inspection shall be maintained. l
- e. Employee Trainino: Employee training programs shall inform personnel responsible for implementing activities identified in the Storm Water Pollution Prevention Plan or otherwise responsible for storm water management, at all levels of responsibility, of the components and goals of the Storm Water Pollution Prevention Plan. Training should address topics such as spill response, good housekeeping and material management practices. A pollution prevention plan shall identify periodic dates for such training.
- f. Record-keepina and Internal Reportina Procedures:
A description of incidents (such as spills, or 6
I I* I l i Attachment B l other discharges), along with other information - describing the quality and quantity of storm ) waterdischarges shall be included in the plan required under this part. Inspections and maintenance activities shall be documented and records of such activities shall be incorporated into the plan.
- g. Non-Storm Water Discharaes:
(1) The plan shall include a certification that the discharge has been tested or evaluated for the presence of non-storm water discharges. The certification shall include the identification of potential significant sources of non-storm water at the site, a description of the results of any test and/or evaluation for the presence of non-storm water discharges, the evaluation criteria or testing method used, the date of any testing and/or evaluation, and the on-site drainage points that were directly observed during the test. Certifications shall be signed in accordance with Part II.D.3. of this permit. Such certification may not be feasible if the facility operating the storm water discharge associated with industrial activity does not have access to an outfall, manhole, or other point of accecs to the ultimate conduit which receives the discharge. In such cases, the source identification section of the Storm i Water Pollution Provention Plan shall ( indicate why the certification required by this part was not feasible, along with the identification of potential significant , source of non-storm water at the site. A l discharger that is unable to provide the i certification required by this paragraph must r notify the RA in writing. (2) Except for flows from fire fighting activities, sources of non-storm water that ) are combined with storm water discharges I associated with industrial activity must be identified in the plan. The plan shall identify and ensure the implementation of l appropriate pollution prevention measures for l the non-storm water component (s) of the discharge.
- h. Sediment and Erosion Control: The plan shall )
identify areas which, due to. topography, i activities, or other factors, have a high potential for significant soil erosion, and 7 l
l - l ! f Attachment B . l identify structural, vegetative, and/or , stabilization measures to be used to limit ! erosion. l i
- 1. Manacement of Runoff: The plan shall contain a !
i. narrative consideration of the appropriateness of ! traditional storm water management practices ?
, (practices other than those which control the generation or-source (s) of pollutants) used to divert, infiltrate, reuse, or otherwise manage {
storm water runoff in a manner that reduces t pollutants in storm-water discharges from the ; site. The plan shall provide measures that the permittee determines to be reasonable and l appropriate and these measures shall be implemented and maintained. The potential of various sources at the' facility which contribute 3
. pollutants to storm water discharges, associated with industrial activity [see Section D.2 of-this attachment (Description of Potential Pollutant Sources)) shall be considered when determining
- reasonable and appropriate measures. Appropriate ;
measures may include: vegetative swales and i practices, reuse of collected storm water (such as ! for a process or as an irrigation source), inlet controls (such as oil / water separators), snow !
. management activities, infiltration devices, and '!
t wet detention / retention devices. l t i i 4. Comorehensive Site comoliance Evaluation: Qualified personnel shall conduct site compliance evaluations at appropriate intervals specified in the plan, but, except as provided in Section D.4.d of this attachment (below), in no case less than once a year. Such j , evaluations shall provide: . l
- a. Visual Insoection: Areas contributing to a storm water discharge associated with industrial activity shall be visually inspected for evidence of, or the potential for, pollutants entering the drainage system. Measures to reduce pollutant loadings shall be evaluated to determine whether they are adequate and properly implemented in accordance with the terms of the permit.or whether additional control measures are needed. Structural storm water management measures, sediment and erosion control measures, and other structural pollution prevention measures identified in the plan shall be observed to ensure that they are operating correctly. A visual inspection of equipment needed to implement the plan, such as l spill response equipment, shall be made. ;
8 1
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i l Attachment B ;
- b. Plan Revision: Based on the results of the inspection, the description of potential pollutant sources identified in the plan in accordance with i Section D.2 of this attachment (Description of Potential Pollutant Sources) and pollution 4 prevention measures and controls identified in the i
< plan in accordance with Section D.3 of this i attachment (Measures and Controls) shall be, i revised as appropriate within two weeks of such inspection and shall provide for implementation of l any changes to the plan in a timely manner, but in ; no case more than twelve weeks after the inspection. . t
- c. Inspection Report: A report summarizing the scope of the inspection, personnel making the l inspection, the date(s) of the inspection, major l
! observations relating to the implementation of the l Storm Water Pollution Prevention Plan, and actions j taken in accordance with Section D.4.b of this attachment (above) shall be made and retained as part of the Storm Water Pollution Prevention Plan for at least one year after coverage under this permit terminates._The report shall identify any incidents of non-compliance. Where a report does i not identify any incidents of non-compliance, the l 4
report shall contain a certification that the
- 3 facility is in compliance with the Storm Water Pollution Prevention Plan and this permit. The report shall be signed in accordance with Part II.D.3.(signatory requirements) of this permit. ;
- d. Inactive Minino: Where annual site inspections ,
are shown in the plan to be impractical for l inactive mining sites due to the remote location- ! and inaccessibility of the site, site inspections l required under this part chall be conducted at I appropriate intervals specified in the plan, but, i ijn no case less than once in three years. . 1
- 5. Consistency with Other Plans: Storm Water Pollution !
Prevention Plans may reflect requirements for. Spill Prevention Control and Countermeasure (SPCC) plans , developed for the facility under Section_311 of the CWA i or Best Management Practices (BMP) Programs otherwise : required by an NPDES permit for the facility as long as such requirement is incorporated into the Storm Water Pollution Prevention Plan.
- 6. Additional Recuirements for Storm Water Discharces Associated with Industrial Activity throuch Municipal Separate Storm Sewer Systems servino a Pooulation of 100,000 or more:
9
,- --r - -I .
I l. Attachment. B *
- a. In addition to the applicable requirements of this permit, the permittee must comply with applicable requirements in municipal storm water management programs developed under NPDES permits issued for !
the discharge of the municipal. separate storm sewer system that receives the facility's I discharge, provided the discharger has been notified of such conditions. . b.. The permittee shall make plans available to the- i' municipal operator of the system upon request. 6
- 7. Additional Recuirements for Storm Water Discharaes
- Associated with Industrial Activity from Facilities !
subiect to Emeraency Plannina and Community Richt-to- , Know (EPCRA) Section 313 Reauirements: In addition to the requirements of Section D.1 through D.4 of this attachment and other applicable conditions of this l permit, Storm Water Pollution Prevention Plans for : facilities subject to reporting requirements under ! EPCRA Section 313 for chemicals which are classified as ;
"Section 313 Water Priority Chemicals" shall describe l and ensure the implementation of practices which are -
necessary to provide for conformance with the following guidelines:
- a. Minimum controls: In areas where Section 313 Water Priority Chemicals are stored, processed or otherwise handled, appropriate containment, drainage control and/or diversionary structures :
shall be provided. At a minimum, one of the j following preventive systems or its equivalent shall be used: n (1) Curbing, culverting, gutters, sewers or other t forms of drainage control to prevent or j minimize the potential for storm water run-on i to come into contact with significant sources ! of pollutants; or t (2) Roofs, covers or other forms of appropriate i protection to prevent storage piles from i exposure to storm water, and wind. !
- b. Additional Considerations: In addition to the i minimum standards listed above, the, Storm Water !
Pollution Prevention Plan shall include a complete ! discussion of measures taken to conform with the j following applicable guidelines, other effective storm water pollution prevention procedures, and ; applicable State rules, regulations and ! guidelines-10
i
. i i
4 . ; l Attachment B l (1) Materi-1 storace areas for Section 313 Water Priority Chemicals for licuids:: Liquid storage areas where storm water comes into : contact with any equipment, tank, container, i or other vessel used for Section 313 Water i Priority Chemicals. , (a) No tank or container shall be used for i the storage of a Section 313 Water
- Priority Chemical unless its material and construction are compatible with the ,
material stored and conditions of i l storage such as pressure and temperature, etc. l (b) Liquid storage areas for Section 313 j Water Priority Chemicals shall be ; operated to minimize discharges of , Section 313 chemicals. Appropriate [ measures to minimize discharges of Section 313 chemicals may include ; secondary containment provided for at least the entire contents of the largest
- single tank plus sufficient freeboard to allow for precipitation, a strong spill contingency and integrity testing plan, ;
i and/or other equivalent measures. l (2) Material storace areas for Section 313 Water l Priority Chemicals other than liauids: ! Material storage areas for Section 313 Water l Priority Chemicals other than liquids which l are subject to runoff, leaching, or wind 'i shall incorporate drainage or other control , features which will minimize the discharge of j 4 Section 313 Water Priority Chemicals by reducing storm water contact with Section 313 j
- l. Water Priority Chemicals. '
1 (3) Truck and rail car loadina and unloadina l areas for licuids in Section 313 Water ' Priority Chemicals: Truck and rail car ; 1 loading and unloading areas for liquid l Section 313 Water Priority Chemicals shall be j operated to minimize discharges of Section i 313 Water Priority Chemicals. Protection such i as overhangs or door skirts to enclosa trailer ends at truck loading / unloading docks shall be provided as appropriate. Appropriate measures to minimize discharges of Section 313 chemicals may include: the placement and maintenance of drip pans.(including the 11
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l ' i l Attachment B l proper disposal of materials collected in the l drip pans) where spillage may occur (such as hose connections, hose reels and filler j nozzles) for use when making and breaking l hose connections; a strong spill contingency ; and integrity testing plan; and/or other equivalent measures. : 1 l (4) Process / Work Areas: Areas where Section 313 l Water Priority Chemicals are transferred, j processed or otherwise handled - Processing l equipment and materials handling equipment ; j shall be operated so as to minimize i discharges of Section 313 Water Priority Chemicals. Materials used in piping and : equipment shall be compatible with the substances handlad. Drainage from process and materials handling areas shall minimize storm l water contact with Section 313 Water Priority l Chemicals. Additional protection such as , l covers or guards to prevent exposure to wind, ! spraying or releases from pressure relief l vents from causing a discharge of Section 313 l Water Priority Chemicals to the drainage system shall be provided as appropriate. , Visual inspections or leak tests shall be ! l provided for overhead piping conveying ' Section 313 Water Priority Chemicals without secondary containment. (5) Discharces from areas covered by Paracraphs 7.b.(1), (2), (3) or (4): i (a) Drainage from areas covered by paragraphs 7.b.(1), (2), (3) or (4) of L this part should be restrained by values i or other positive means, to prevent the : discharge of a spill or other excessive leakage of Section 313 Water Priority Chemicals. Where containment units are employed, such units may be emptied by pumps or ejectors; however, these shall be manually activated. (b) Flapper-type drain valves shall not be l used to drain containment areas. Valves j used for the drainage of containment areas should, as far as is practical, be of manual, open-and-closed design. (c) If facility drainage is not engineered as above, the final discharge of all i 12 l l l t
4 Attachment B in-facility storm sewers shall be equipped to be equivalent with a diversion system that could, in the event of an uncontrolled spill of Section 313 Water Priority Chemicals, return the spilled material to the facility. (d) Records shall be kept of the frequency and estimated volume (in gallons) of discharges from containment areas. (6) Facility site runoff other than from areas covered by 7.b. (1) . (2). (3) or (4): Other areas of the facility [those not addressed in paragraphs 7.b.(1), (2), (3) or (4)], from which runoff which may contain Section 313 Water Priority Chemicals or spills of Section 313 Water Priority Chemicals could cause a discharge shall incorporate the necessary drainage or other control features to prevent discharge of spilled or improperly disposed material and ensure the mitigation of pollutants in runoff or leachate. (7) Preventive maintenance and housekeepina: All areas of the facility shall be inspected at specific intervals identified in the plan for leaks or conditions that could lead to discharges of Section 313 Water Priority Chemicals or direct contact of storm water with raw materials, intermediate materials, waste materials or products. In particular, facility piping, pumps, storage tanks and bins, pressure vessels, process and material handling equipment, and material bulk storage areas shall be examined for any conditions or failures which could cause a discharge. Inspection shall include examination for leaks, wind blowing, corrosion, support or , foundation failure, or other forms of deterioration or non-containment. Inspection intervals shall be specified in the plan and shall be based on design and operational experience. Different areas may require different inspection intervals. Where a leak or other condition is discovered which may result in significant releases of Section 313 Water Priority Chemicals to waters of the United States, action to stop the leak or otherwise prevent the significant release of section 313 Water Priority Chemicals to 13
Attachment B waters of the United States shall be immediately taken or the unit or process shut down until such action can be taken. When a leak or non-containment of a Section 313 Water Priority Chemical has occurred, contaminated soil, debris, or other material must be promptly removed and disposed in accordance with Federal, State, and local requirements and as described in the plan. (8) Facility security: Facilities shall have the necessary security systems to prevent accidental or intentional entry which could cause a discharge. Security systems described in the plan shall address fencing, lighting, vehicular traffic control, and securing of equipment and buildings. (9) Trainino: Facility employees and contractor personnel that work in areas where Section 313 Water Priority Chemicals are used or stored shall be trained in and informed of preventive measures at the facility. Employee training shall be conducted at intervals specified in the plan, but not less than once per year, in matters of pollution control laws and regulations, and in the Storm Water Pollution Prevention Plan and the particular features of the facility and its operation which are designed to minimize discharges of Section 313 Water Priority Chemicals. The plan shall designate a person who is. accountable for spill prevention at the facility and who will set up the necessary spill emergency procedures and reporting requirements so that spills and emergency releases of Section 313 Water Priority Chemicals can be' isolated and contained
-before a discharge of a Section 313 Water Priority Chemical can occur. Contractor or temporary personnel shall be informed of facility operation and design features in order to prevent discharges or spills from occurring.
(10) Encineerino certification: The Storm Water Pollution Prevention Plan for a facility subject'to EPRCA Section 313 requirements for chemicals which are classified as "Section 313 Water Priority Chemicals" shall be reviewed by a Registered Professional Engineer and certified to by such 14 .
.I
e Attachment B l Professional Engineer. A Registered Professional Engineer shall recertify the plan every three years thereafter or as soon as practicable after significant modification are made to the facility. By means of these certifications, the engineer, having examined the facility and being familiar with the provisions of this part, shall attest that the Storm Water Pollution Prevention Plan has I been prepared in accordance with good engineering practices. Such certifications i shall in no way relieve the owner or operator of a facility covered by the plan of their duty to prepare and fully implement such plan.
- 8. Additional Reauirements for Salt Storace: Storage l piles of salt used for deicing or other commercial or l industrial purposes and which generate a storm water discharge associated with industrial activity which is discharged to a waters of the United States shall be enclosed or covered to prevent exposure to precipitation, except for exposure resulting from adding or removing materials from the pile. Dischargers shall demonstrate compliance with this provision as expeditiously as practicable, but in no event later than October 1, 1995. Piles do not need to be enclosed j or covered where storm water from the pile is not discharged to waters of the United States.
i l l i i 15
. a 7-27-93 NH20338.FS1 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION I :
JOHN F. KENNEDY FEDERAL BUILDING BOSTON, MASSACHUSETTS 02203 FACT SHEET DRAFT NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT TO DISCKARGE TO WATERS OF THE UNITED STATES NPDES PERMIT NO.: NH0020338 STATE PERMIT NO.: NAME AND ADDRESS OF APPLICANT: j North Atlantic Energy Service Corporation P. O. Box 300 Seabrook, NH 03874 l l NAME AND ADDRESS OF FACILITY WHERE DISCHARGE OCCURS: , North Atlantic Energy Service Corporation Seabrook Station Route 1 ; Seabrook, NH , RECEIVING WATER: Browns River and Atlantic Ocean ! I ( CLASSIFICATION: Browns River is Class B , Nearshore Atlantic Ocean is Class B ; i I. Proposed Action, Type of Facility, and Discharge Location. The above named applicant has applied to the U.S. I Environmental Protection Agency for reissuance of its NPDES , permit to discharge into the designated receiving water. l The facility is engaged in the generation of electrical ; power. The discharge is from: storm water, process waste $ water, treated sanitary waste and once-through cooling : I water. I
~
II. Description of Discharge. r Attachment A shows the station site, discharge 1 cation, a schematic diagrams of water usage in the station, and storm water disposition. A quantitative description of the discharge in terms of significant effluent parameters based permit reapplication data is presented in Attachment B.
O Permit No. NH0020338 . III. Limitations and Conditions. The effluent limitations, any special conditions, the monitoring requirements, and any implementation schedule (if required) may be found in the following document: Attachment D - Part I of the Draft Permit: Effluent Limitations and Monitoring Requirements. (Separate Document) IV. Permit Basis and Explanation of Effluent-Limitation Derivation. For convenience, this section of the Fact Sheet has been divided as follows: Section Paae A. Preface . 2 [ B. Memorandum of Understanding Between 4 1 US Environmental Protection Agency and I the US Nuclear Regulatory Agency , C. Facility Information 5 l D. Flows, Sources and Treatment Technology 6 l
- 1. Marine Water Flows 7 i
- 2. Fresh Water Flows 8 ;
E. Basis of Permit Conditions and Limitations 16 ! F. Effluent Limitations and Conditions 18 G. Proposed and Existing Permit Effluent 23 I Limitation Requirements Comparison l H. Biofouling Control 24 t I. Section 316 of the Clean Water Act 26 , (Technical Advisory Committee) J. Criteria for Cooling Water System 29 I K. Thermal Limitations 30 l L. Intake Cooling Water System and Structures 33 . M. Tentative CWA Determination 34 l i b A. Preface l l This NPDES permit has been drafted to supersede the existing { i permit which covered the Seabrook Station Discharges during the construction aspect and early operations phase.- The :
. operational phase in the existing permit was based upon the !
original water system design parameters of the' power pl?nt l while this reissuance pernit is based on the actual operational charactaristics. There have been several changes between the "as-designed" plans and "as-built"/"as- l operated" facility. Seabrook Station applied for reissuance of the NPDES Permit ] on February 21, 1990 (180 days before the expiration of the permit in accordance with 40 CFR 122.21(d)). The j reapplication was based exclusively on "as designed" data. ; 1 --rw.- , --- .r,. . .,.,,--.-....,~r
* , , , --.,e-, ~ , _
. Permit No. NH0020338 EPA recognized that Seabrook Station could become operational about the time that the NPDES Permit would normally expire on August 26, 1990. Therefore, EPA requested that Seabrook Station amend the application by taking samples for analysis after the Seabrook Station was in stable operation. Seabrook Station began regular full power operation on August 19, 1990, and the samples were taken several months later. The amended permit application reflecting tha actual operations was submitted on April 11, 1991.
Therefore, all discussions herein concerning Seabrook i Station is based upon: (1) the design that became . operational on August 19, 1996, and (2) the proposed l diversion of the Settling Basir. Discharge from the Browns l 4 River to the Cooling Water System, Discharge 001, (Discharge Tunnel) for ocean disposal, Figurer 2A, 2B, and 2C. Likewise, all chemical data for the Seabrook Station wastewater discharges are derived from samples taken during 1 normal plant operation, Attachment B. l The most significant change was the cancellation of the construction of the second unit after EPA and the State had approved the water discharges for construction and operation ! of the two unit design. The original marine non-contact coo.11'g water system was designed with a circulating cooling wattc system of about 1,200 Million Gallons per Day (MGD) and the flow rate was expected to be about 600 MGD as a result of the cancellation of Unit 2. The current "as-built" design now will have water discharge flow of about 720 MGD because the pump design were found to be more j efficient than designed and the water friction factor used i for the tunnel design was very conservative. The heat load in the cooling water discharge is about 1/2 of the originally approved heat load for the two-unit facility; however, the maximum temperature increase of the single unit remains the same as the two-unit design at a maximum of l 41 F above local ambient water temperature. The design of the condenser remains unchanged at 41 F maximum temperature rise but the number of condenser units was reduced from two to one. The synergetic effect of the increased flow rate, indicated above, is that the operational maximum discharge temperature and the operational maximum temperature rise above local ambient temperature will be proportionally lower thereby decreasing the thermal impact upon the environment. l The second significant change considered in this proposed permit is the diversion of the Settling Basin Discharge from the Browns River to Atlantic Ocean through the Circulating Water Discharge, Discharge 001. This eliminates all point discharges to Browns River. The original Seabrook Station Environmental Report of June 1973 considered the inclusion of the treated sanitary waste and the plant site storm water runoff in the off shore discharge, Discharge 001. NRC, EPA 3
Permit No. NH0020338
- and the State approved this method of disposal; however, it was not implemented at that time. This design was reflected in the operating license application for Seabrook Station and will become functional now that the station is-operational. Figures 2A, 2B and-2C clearly shows this proposed change in the station flow paths.
In the recent past, the small flow (50,000 gpd) from the sanitary waste treatment system commingled with plant site storm water runoff from several pipes discharged into a large capacity Settling Basin (about 2,000,000 gallons) resulting in resident times of up to 40 days. .These long resident times were ideal for algae blooms which caused the pH and TSS violations of the permit requirements for the discharge into the Browns River. By reducing the volume of where the several streams are commingled from the large settling basin to a small " junction box" (manhole) constructed in one corner of the basin, the resident time would be so short as to prevent the natural occurrence of algae thereby eliminating these type permit violations. This flow path modification also eliminates the reported problem of Fecal Coliform released from Seabrook Station, Discharge 002, into the Browns River and Hampton Harbor. Evidence has shown that the sanitary treatment plant onsite has functioned properly and that the major source of the reported Fecal Coliform contamination in the Browns River most likely was associated with storm runoffs from on site sea gull perching areas. By diverting the Discharge 002 from the Browns River to the ocean discharge, Discharge 001, any fecal coliform, from whatever source, is: (1) removed from the harbor eliminating contamination of shell fish and protecting the harbor waters for other human uses and (2) discharged into a marine water which serves as a natural disinfectant to the organism. B. Memorandum of Understandina Between the Environmental Protection Acency and the Nuclear Reculator Acency , The Environmental Protection Agency (EPA) and the Nuclear , Regulatory Commission (NRC) signed a Memorandum of l Understanding (MOU) on December 17, 1975, which specifies that EPA will be responsible for the water quality of the ! wastewater discharge in concert with the State and that NRC will be responsible for the radioactivity level of the l discharge. Therefore, this permit addresses only the , chemical aspects and thermal aspects of the water quality : and does not consider any radioactive parameters. All the ! NRC_ radioactive discharge requirements will continue to be j met as required in 10'CFR 20 and the technical plant 1 specifications. I 4 l l l wm , , . ...w-- - - - - > - - . - , - . . , , . , , r,, .-c.- , , - . -- - ,- -
. Permit No. NH0020338 C. Facility Information.
The "Seabrook Station Managing Agent" has changed from the Public Service Company of New Hampshire to the North Atlantic Energy Service Corporation. This change was the result of Northeast Utilities acquisition of Public Service Company of New Hampshire. Seabrook Station now consists of only one pressurized-water reactor with an electrical output of approximately 1200 megawatts (gross) of electrical energy (MW). The plant is located on about 715 acres on Highway 1 in Seabrook, New Hampshire. The plant siting is shown in Attachment A on Figure 1 with the locations of the Intake Structure and the Discharge Diffuser. These two structures are approximately 7,000 and 5,500 feet respectively off Hampton Beach and Seabrook Beach. The specific station discharges addressed in this proposed permit are listed below and identified in the Station Water Use Diagrams, Figures 2A, 2B, and 2C. Attachment B gives a comparison of the previous permit requirements, actual operational data, and proposed permit limits for these streams: Average Discharge Flow Discharge Number Rate,MGD Description Receivino Water 001 720 Circulating Water System Atlantic Ocean Discharge (Combined: cooling water, process , wastewater, treated sanitary j wastewater, and storm water) ) 002* 6.15 Settling Basin Discharge Browns River (Combined: treated sanitary then Discharge wastewater and plant storm Tunnel, water runoff) Discharge 001. 003 ** Thermal Backflushing Atlantic Ocean Operation Discharge 021* 0.035 Sanitary Treatment Plant Settling Basin, Discharge Discharge 002, then Disch. 001
---* 6.1*** Storm Water Runoff Settling Basin l Discharge 002, l
then Disch. 001 5
l P Permit No. NH0020338 . t Secondary Plant Leakage: 022 0.03 Vault # 1 Discharge i Tunnel, Discharge 001 023 0.04 Vault # 2 Same 024 0.01 Vault # 3 Same l 025 0.3 Liquid Waste Distillate and Discharge 001 l Steam Cenerator Blowdown l Recovery Regenerator Sump 026 1.0 Treated Chemical Cleaning Discharge 001 Wastes 027 0.5 Auxiliary Cooling Tower Discharge 001 Blowdown Footnotes:
- Discharge 002 designation will be retained after the Treated Sanitary Wastewater Discharge, Discharge 021; and the station storm water flows are diverted from the Settling Basin to the Circulating Cooling Water System Discharge, Discharge 001. This designation reflects a '
similar type discharge with only the receiving water being changed.
** The thermal backflushing operation will have a duration of about 6 hours at a flow rate of 471,000 gallons per minute or a total of about 170 million gallons of heated marine water in each backflush operation.
l
*** Two-year, 24-hour storm event.
D. Flows, Sources of Pollution, and Treatment Technoloaies The following text should be read in conjunction with Figures 1 (Facility Location), Figures 2A, 2B and 2C (Station Water Use), and Figure 3 (Station Drainage Areas). Seabrook Station utilizes three sources of water: the Atlantic Ocean for condenser cooling water, municipal wells j in the Town of Seabrook for potable water and for steam generation, and private wells both on and off the station i site as a backup for the municipal wells or for emergency conditions. Currently, the water is discharged though two ocean outfalls (Discharges 001 and 003) with one outfall into the Browns River (Discharge 002). After diversion of j the sanitary wastes and storm water to the Discharge Tunnel, there will be only two discharges, Discharge 001 and 003, to ' the Atlantic Ocean since the discharge to Browns River will have been eliminated. 6
f
. Permit No. NH0020338 1
l 1. MARINE WATER FLOWS t Discharce 001, Circulatina Water System Discharae l l Ocean water is used for cooling equipment (service water), ! l and condensing steam (circulating water). Water is taken ; ! into the Circulating Cooling Water System through three ; intake structures located approximately 7,000 feet offshore ! (Figure 1). From the intakes, cooling water flows about ; ! 18,000 feet (3 miles) through a 19-foot diameter tunnel from ; l the intake structures to the on-site pump house. l Approximately 714 mgd will be drawn through the system and l utilized for both condenser cooling (677 mgd) and service ! l water cooling (37 mgd). Water from this system will be l l discharged through the onsite Discharge Transition Structure l l (DTS) in the station proper before traveling about 18,000 ; l feet (3 miles) through a 19-foot discharge tunnel to the i multiport diffusers which are 5,500 feet offshore. All f monitoring for this discharge takes place at the DTS si. ice l there is no sampling point between the plant site and the diffuser. Service water for auxiliary cooling is pumped to heat f exchangers within the Seabrook Station for component and i Emergency Diesel Generator cooling. The service water mixes ! with the condenser cooling water prior to entering the discharge tunnel. Currently, the Circulating Water System becomes the transport for treated waste drains from the l primary plant, and treated floor drainage from the secondary ' plant. Process waste water flows (Oil / Water Separator i l vaults No. 1, 2 and 3 (Discharges 022, 23 and 024), ; discharges from the Steam Generator. System (Discharges 027), , i and neutralization tank discharges following water ! l treatment, are also released through' Discharge 001. ! l \ I [ Planned modifications to Seabrook Station flow paths will divert the Sewage Treatment Plant effluent (Discharge 021) and all site runoff collected by the storm water drainage system from the Settling Basin (Discharge 002) to the Circulating Water System through a new manhole. The characteristics of Discharge 002 into Browns River is identical to the characteristics of Discharge 002 into the new manhole for ocean disposal via Discharge 001. Biofouling control is achieved through the use of continuous, low-level chlorination of the circulating cooling water stream within both the Circulating Water and the Service Water Systems. Chlorine (sodium hypochlorite) is injected at the offshore intake structures and at additional-locations within the station as needed. A Chlorine Minimization Program has been implemented to minimize its use in Seabrook Station while maintaining suitable macro-biofouling control of the intake cooling water system and micro-biological control in the steam condensers. 6 i 7 I l
, , , .y--- vr , -c- -r +-w,
I I Permit No. NH0020338 .
]
l Discharoe 003. Thermal Backflush l In addition to chlorination, thermal backflushing of the I intake tunnel may be employed to remove sessile biofouling ! organisms attached to system components. This method ! involves the reversal of the normal cooling water flow such ! that the three intake structures serve as the discharge ; points (Discharge 003) and the discharge diffuser ports, conversely, function as the intake structure (see Figures 1 and 2). Temperatures within the intake tunnel will be elevated to a '! maximum of 120 F for a maximum of 2 hours. The entire flow reversal and heat treatment cycle will occur over a six-hour period at a cooling water flow rate of 471,000 gallons per . minute. There will be no chlorination of the condenser ! cooling water during the thermal backflushing treatment. The thermal backflushing operation may be used infrequently ', to compliment the normal Intake Tunnel chlorination ! procedures for those sessile organisms that are not controlled by the sodium hypochlorite injection or for those ; organisms located upstream of the sodium hypochlorite ! injection points. (See Section H, Biofouling Control for - further information.) i i
- 2. FRESH WATER FLOWS i i
Fresh water is utilized to supply the needs of the Station [ Potable water system, make-up water to the Auxiliary Cooling * ' Towers, water needs to the Demineralization Water Make-up-System, and make-up to the Fire Protection System. Refer to Figures 2A and 2B. ; i Fresh water utilized by Seabrook Station is derived from the i Town of Seabrook municipal well system. Currently, an { average of 156,000 gallons per day (gpd) are obtained from 1 the Town of Seabrook with a maximum of 320,000 gpd possible. In addition, provisions have been made to obtain water as needed for system make-up from wells owned by North Atlantic , Energy Service Corporation (Seabrook Station). These wells I are located on site and along Brimmer Lane in the Town of Hampton Falls; however, they are not currently connected to the potable water system and are unavailable for use. The wells will be activated as necessary should the demand for fresh water exceed the maximum allowed use from the l municipal source. A maximum yield of approximately 500,000 j l gpd can be obtained from both the onsite wells and those l located on Brimmer Lane. All flows will vary appreciably j during Seabrook Station operation. During Seabrook Station operation,. demineralized water is used to replace leakage losses from both the primary and secondary water cycles. There are four major effluent streams from the Demineralized Water Make-up System: 8 l
, Permit No. NH0020338 Demineralizer Regeneration Effluent, Steam Generator Blowdown and related effluents, Primary Plant Leakage, and !
- Secondary Plant Leakage. The make-up flow to the primary i plant is estimated at 6,000 gpd, but may vary as much as t l 20,000 gpd during Seabrook Station operation. Water leaving l the system is collected within the Waste Test Tank and may be processed by a combination of filtration, evaporation, and demineralization. Treated water is recycled whenever possible. Treated liquid waste effluent will be discharged following monitoring, to the Circulating Water System, Discharge 001. ;
Regenerate chemicals for the water treatment plant ! demineralizers are neutralized before discharge to the l Circulating Water System (Discharge 001). A 30,000 gallon j neutralization tank has been installed to accommodate this ! system which is discharged via batch mode to the Circulating ! Water System. This neutralization tank may be discharged ! numerous times on a single day depending upon Seabrook l Station requirements. l t Discharaes 022,023.024, Secondary Plant Leakace, Vaults ~1, - 2, and 3 i The make-up water to the secondary (power generation) system ! constitutes the greatest need for demineralized water during l Seabrook Station operation. An estimated 68,000 gallons per j day (maximum of 367,000 gpd) is needed. The portion of the flow that leaks or drains from the system is collected in i floor drains and passed through oil / water separators prior R to discharge. Each separator has been designed to discharge l a maximum of 122,400 gpd. The average flows presented in { Figure 2 represent those seen from these systems since the NPDES permit was issued in 1985. Each separator is designed l to separate oil from drainage water. The oil / water separators are arranged to process drainage piped from the following buildings and plant areas: o Oil / Water Separator #1 (Discharge 022) - Emergency Feedwater Pump House drainage, the Turbine Building sump, the Lube Oil Building sump, and the Lube Oil Storage Room sump. o Oil / Water Separator #2 (Discharge 023) - Diesel Generator Building sumps and the Auxiliary Boiler Room drainage. o Oil / Water Separator #3 (Discharge 024) - Auxiliary Boiler Fuel Oil Storage Tank area, the Fire Pump House Day Tank area, and the Fire Pump House drainage trench. The Processed effluent is currently discharged to the Atlantic Ocean via the circulating Water System, Discharge 001. l t 9 l
l i I Permit No. NH0020338 . l Discharce 025, Steam Generator Blowdown and Licuid Waste Distillate i The Steam Generator Blowdown system is designed to remove ' dissolved impurities and suspended solids from the secondary side of the steam generators. This is accomplished by continuous blowdown of liquid from each of the four Steam i Generators. The blowdown flow is processed to recover and ! recycle as much of this water as possible. Processing may [ involve evaporation, filtration and demineralization. The i non-recycled effluent stream is then discharged to the Circulating Water System flow prior to discharge to the ocean. Discharge 025 receives purified liquid waste and ; neutralization effluent from the Steam Generator Blowdown l and Recovery Regeneration sump. Also monitored and reported l through this outfall is the blowdown directly from the Steam Generators, Steam Generator Blowdown Distillate, effluent
- from the Recovery Test Tank, and discharges from the Waste r Test Tank. Each is discharged via batch release to the i Circulating Water System (Discharge 001). As extensive operational data is not yet available for these systems to provide an accurate average value, the following maximum !
discharge capacities are provided: - o Steam Generator Blowdown - 384,000 gpd o Steam Generator Blowdown Distillate - 50,000 gpd' o Steam Generator Blowdown Recovery Sump - 28,000 gpd j o Waste or Recovery Test Tank - 20,000 gpd The average flow rate for Discharge 025 has been increased [ from 40,000 to 300,000 gallons per day to accommodate the I possibility that the Steam Generator may require continuous
- blowdown to control water chemistry parameters.
l Discharce 026, Treated Chemical Cleanino Wastes Chemical cleaning wastes are processed onsite to improve the quality of discharge water, Discharge 026, prior to their release to the environment through the Settling Basin, 1 Discharge 002. A maximum of 1 million gallons per day may be discharged from this system depending upon Seabrook Station needs. In addition to chemical cleaning wastes, the l basins may be utilized for the neutralization of Settling i Basin water prior to discharge to the environment through Discharge 002. All other discharges will be made via batch mode through the Settling Basin Discharge, Discharge 002, to l i the Browns River. The proposed modification of the Seabrook Station wastewater flow paths will divert all storm water and treated Sanitary Waste (Figure 2B and 2C) to the Circulating Water System through Discharge 001 for ocean disposal. In addition, with 10 I
, Permit No. NHOO20338 the decommissioning of the onsite Settling Basin with its discharge to the Browns River, neutralization through the chemical cleaning basins will no longer be required. As a result, the onsite chemical cleaning treatment basins will also be decommissioned. Upon decommissioning of the chemical cleaning treatment basin, Seabrook Station will utilize portable chemical treatment facilities and holding tanks that are to be located at the plant site where the specific cleaning. operation will be performed. The discharge from these portable facilities must meet the same conditions and effluent limitations as the existing' fixed chemical cleaning treatment facilities and,.therefore, the discharge shall still be designated as Discharge 026. The discharge from the portable holding tanks will be into the Circulating Water System, Discharge 001, for ocean disposal. A minimum of at least one circulating pump in the Circulating Water System must be operating during any discharge of the Treated Chemical Cleaning Waste from a portable treatment system and holding tanks. The only difference between the fixed and portable treatment systems is the point of discharge into the wastewater collection system leading to the Discharge Tunnel. Discharce 027, Auxiliarv'Coolina Tower Blowdown A mechanical draft cooling tower, installed as emergency backup to the Service Water System, has the capacity of removing 217-million BTU per hour. The tower is filled with approximately 4 million gallons of fresh water. The cooling tower will also be utilized during thermal backflushing of the Circulating Water-System. The flows shown are those related to the backflushing process. The atmospheric discharge of 360,000 gpd has been calculated for a 10-hour use period. Make-up flow would refill the tower over an 18-day period. Salt water may be utilized as make-up to the tower should a sufficient freshwater supply not be available. In such a. case, blowdown would be required to eliminate the higher concentration of solids within the tower. Blowdown of the cooling tower is expected to be performed on a once a month basis, discharging an average of 0.5 million gallons over a one-hour period. Cooling tower blowdown, when it occurs, will be made to the Circulating Water System (Discharge 001). Discharce 021, Treated Potable and Sanitary Wastes Sanitary wastes are collected and processed at an onsite treatment facility. This facility employs tertiary treatment utilizing: (1) an activated sludge treatment 11
l . i l Permit No. NH0020338 - system, (2) aerated lagoons, and (3) filtration, and l subsequent chlorination of the final effluent. An average i of 35,000 gpd are processed prior to discharge through the l onsite Settling Basin to the Browns River at Discharge 002. l Currently, the facility is operated five days per week l (Monday - Friday) due to limited inflow over the weekend days. At times of lower flows or during times of system maintenance, the facility may be operated for lesser periods. This will'not jeopardize operation or discharge quality due to reserve volume available within the lagoons. Planned modification to the Seabrook Station flow paths will place all discharges from the Sewage Treatment Plant into the Circulating Water System for discharge through Discharge 001 to the Atlantic Ocean. As a result of the extensive volume within the Circulating Water System and an adherence to the discharge limits specified at the Sewage Treatment l Plant outfall, this change will have no impact on the receiving waters, the Atlantic Ocean. All treatment works treating domestic sewage are required to have conditions which implement the technical sludge standards required by Section 405(d) of the Clean Water Act. l The conditions included in the permit satisfy this l requirement: l l
- 1. The permittee shall comply with all existing Federal and State laws and regulations that apply to sewage sludge use and disposal practices and with the Section 405 (d) of the Clean Water Act (CWA) technical standards when promulgated.
If an applicable management practice or numerical limitation for pollutants in sewage sludge more stringent than existing Federal and State condition is promulgated under Section 405 (d) of the CWA, the permittee shall comply with the new requirement no later than the compliance specified in the applicable regulations as required by Section 405 (d) of the CWA.
- 2. The permittee shall give prior notice to the Regional l Administrator and the Commissioner of the NH DES of any l change (s) planned in the permittee's sludge use or l disposal practice.
- 3. A change in the permittee's sludge use or disposal -
practice is a cause for modification of the permit. It is a cause for revocation and reissuance of the permit ' it the permittee requests or agrees. l l
- 4. The permittee shall monitor the sludge prior to l ultimate disposal for the following pollutants (total metals): copper, cadmium, chromium, lead, nickel and l zinc. The results shall be submitted by June 15th of ,
l each year. I 12 i
, Permit No. WH0020338 Discharce 002, Settlina Basin Discharce l Discharge 002, the Settling Basin, has a capacity of approximately 2 million gallons. The principal influent is ' site storm water. Other influents include the discharge from Discharges 021 and 026. Water periodically flushed from portions of the Fire Protection System to the storm water collection system may also be present. The combined , effluent is controlled through an adjustable weir and is discharged to the Browns River. At times when the pH of the ; basin is outside of permitted limits, seawater may be - introduced or water may be transferred to the Chemical , Cleaning Basins for neutralization prior to discharge to the > Browns River. Planned modifications to Seabrook Station flow paths will place all discharges from the Settling Basin into the Circulating Water System for discharge through Discharge 001 to the Atlantic Ocean. During dry weather the discharge of 35,000 gallons per day of treated sanitary waste will be i diluted with 720 MGD of cooling water. A one-inch rain storm will yield about 1 million gallons of runoff. As a result of the extensive dilution within the Circulating Cooling Water System, this change will not have a significant impact on the receiving waters, the Atlantic Ocean, Page 3. The permittee must notify EPA and the State the date that the first of the several Settling Basin influents are diverted to the Circulating Water System and the date (Diversion Date) that the discharge from the Settling Basin < into Browns River is terminated. ! Storm Water Runoff Storm water runoff as a result of rainfall onsite is controlled by: (1) catch basins located at the power plant site which currently discharge to the Settling Basin; (2) catch basins located at the General office Building which discharge to the adjoining environment; and (3) sheet flow l which is allowed to percolate into the ground or to discharge in various small brooks. The estimated storm water flow to the Settling Basin during the 2-year, 24-hour rainfall event is 6.1 MGD. l It is currently planned that storm water collected and discharged through the Settling Basin, be routed and discharged to Circulating Water System (Discharge 001) through a new manhole on the Circulating Water System, Page
- 3. The flow consists of drainage from roof drains and those areas surrounding power plant site (station) buildings, the collection of drainage along the North Access Road, and various construction laydown areas.
13
t Permit No. NH0020338- , Station drainage areas are outlined in Figure 3. The storm water runoff from the area identified by the letter "A" currently flows to the Settling Basin; however, this runoff will be redirected to the Circulating Water System and discharge to the' Atlantic ocean through Discharge 001 in the future. The area identified by the letter "B" flows to the environment adjacent to the General Office Building through i catch basins directly into Hampton Harbor. This type of i i uncontaminated storm water does not require a NPDES Permit l j in accordance with the new Storm Water Regulations. i Section 402(p) of the Clean Water Act (CWA) requires that l l EPA issue permits for storm water discharges associated with l' industrial activity. Seabrook Station (Standard Industrial lI Classification code: 4911) , which is engaged in the generation of electrity discharges storm water associated l with industrial activity within the meaning of 40 CFR 4 S122. 26 (b) (14) (iii) . Specifically, this facility has storm water exposure to various chemical and petroleum products ' through malfunction of mechanical equipment (storage tanks, pipelines, pumps, etc.) and through accidental spills from drums, tanks, trucks, etc. , i The permittee has submitted an application including storm water information for coverage under an individual NPDES , permit. The storm water discharges from this activity must satisfy BCT/ BAT requirements, which are technology standards, as well as comply with any more stringent water quality standards if BCT/ BAT are inadequate. On September l 9, 1992, EPA promulgated through its General Permit for Storm Water Discharge Associated with Industrial Activity that the minimum BAT /BCT requirement for storm water discharges associated with industrial activity is a Storm , Water Pollution Prevention Plan (SWPPP) (57 FR, 41264). l EPA has determined that a combination of BCT/ BAT requirements and effluent limitations are required for this storm water discharge. See explanations to follow. j l A permit may not be renewed, reissued or modified with less ; stringent limitations or conditions than those conditions in ' the previous permit unless in compliance with the anti-backsliding requirement of the Clean Water Act (CWA) (See } Sections 402(o) and 303 (d) (4) of the CWA and 40 CFR ' S122.44 (1) (1 and 2)) . {1 In addition, the permit must conform to the conditions l established pursuant to a State Certification under Section l 401 of the CWA that meet the requirements of 40 CFR S124.53 and S124.55. EPA regulations pertaining to permit' limits based upon water-quality rtandards and state requirements are contained in 40 CFR S1.c2.44(d).. Effluent limitations in the draft permit for Outfall 002A and 002B are based on the following considerations: Flow 14
i Permit No. NH0020338 1 from estimated maximum storm water runoff; Total Suspended f Solids (TSS) and Oil and Grease (O&G) from a BPJ ' determination using Steam Electric Power Generating Point i Source Categories; and pH from State Water Quality Standards for Class B receiving water and a State Certification Requirement; and a Storm Water Pollution Prevention Plan 1 (SWPPP) from a BPJ determination using the newly promulgated . regulations regarding General Permits for Storm Water i Discharges Associated with Industrial Activity. The TRO ' limit for Discharge 002A is based upon State Water Quality requirements to protect Browns River. This requirement is not included in Discharge 002B because of the large buffering capacity of the marine waters and the dilution ratio of 720 MGD of the cooling water to 0.035 MGD of the chlorinated sanitary waste, a factor of over 20,000 to 1. j Storm Water Pollution Prevention Plan Pursuant to Section 304(e) of the CWA and 40 CFR ; S125.103(b), Best Management Practices (BMP) may be expressly incorporated into a permit on a case-by-case basis l where necessary to carry out Section 402(a) (1) of the CWA. l The Seabrook Statier stores and handles pollutants listed as toxic under Section 307(a) (1) of the CWA or pollutants listed as hazardous under Section 311 of the CWA and has ancillary operations which could result in significant amounts of these pollutants reaching waters of the United States. These operations include one or more of the following items from which there is or could be site runoff: material storage, material processing, material handling, in-facility transfer, or loading and unloading, etc. l Therefore, to control activities / operations at this facility that could contribute pollutants to waters of the United l States through storm water discharges, the draft permit requires this facility to develop a Storm Water Pollution Prevention Plan (SWPPP) containing BMPs appropriate for this specific facility. Consequently, EPA has incorporated in this draft permit the SWPPP from the General Permit for Storm Water Discharges Associated with Industrial Activity as published in 57 Federal Register (FR) 41307-41311 (September 9, 1992). EPA's Region I has made a BPJ determination that this is the minimum SWPPP needed to identify sources of pollution at this facility affecting quality of storm water discharges associated with industrial activity. In addition, EPA has concluded that this SWPPP's I implementation procedures and practices requirements are sufficiently stringent to control these sources of pollution so as not to violate the terms and conditions of this draft permit or of New Hampshire's Water Quality Standards. The draft permit requires the permittee to develop and implement the SWPPP no later than 180 days after the permit's effective date. The SWPPP when implemented becomes a supporting element to any numerical effluent limitations 15
I I l Permit No. NH0020338 l l by minimizing the discharge of any pollutants through the i proper operation of the facility. Consequently, the SWPPP is as equally enforceable as the numerical limits on the discharge at Outfall 002A and 002B. The goal of the SWPPP is to eliminate or reduce the potential for a discharge of pollutants through the storm water system. In the event the potential cannot be eliminated, the permittee should select BMPs to reduce or eliminate the pollutant loading to the receiving water. In essence, the SWPPP requirement directs the permittee to totally review the physical plant, its equipment, operational procedures and operator training at Seabrook Station. The objective of this review is to protect the l receiving water (Browns River, Hampton Harbor and Atlantic l Ocean) by thoroughly evaluating potential pollution sources at this site and then to select and implement appropriate site specific measures designed to prevent, minimize and/or control the discharge of pollutants that might otherwise enter the storm water system through inappropriate facility I design, hur.an error, or equipment malfunction.
~ To minimize the SWPPP preparation, the permittee may incorporate appropriate information from the Spill Prevention Control and Countermeasures (SPCC) Plan, published operational procedures, training manuals, company policies, etc. These references should be attached to the SWPPP for review / inspection by EPA or NHDES compliance personnel.
E. Basis of Permit Conditions and Limitations The Clean Water Act (Act) prohibits the discharge of pollutants to waters of the United States without a National Pollutant Discharge Elimination System (NPDES) permit unless such a discharge is otherwise authorized by the Act. The NPDES Permit is the mechanism used to implement i technology and water quality based effluent limitations and l other requirements including monitoring and reporting. The I draft NPDES Permit was developed'in accordance with various statutory and regulatory authorities established pursuant to the Act. The regulations governing the EPA NPDES Permit program are generally found at 40 CFR Parts 122, 124, and 125. EPA is required to consider technology and water quality requirements when developing permit limits. Technology based treatment requirements represent the minimum level of control that must be imposed under Sections 402 and 301(b) of the Act (see 40 CFR S125 Subpart A) to meet Best Practicable Control Technology Currently Available (BPT), Best Conventional Control Technology (BCT) for conventional pollutants and Best Available Technology Economically Achievable (BAT) for toxic pollutants. Technology 16
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i Permit No. NH0020338 i guidelines (effluent limitations and compliance deadlines) I for discharges other than Publicly Owned Treatment Works : (POTWs) can be found at 40 CFR Sections 400-471, Subchapter ' N, Effluent Guidelines and Standards. Technology i requirements for POTWs can be found at 40 CFR Part 133, - Secondary Treatment Regulation. In the absence of published technology guidelines the permit l writer is authorized under Section 402 (a) (1) (B) of the Act i to establish effluent limitations on a case-by-case basis using best professional judgement. 1 In general, the statutory deadline for non-POTW technology J requirements are as expeditiously as practicable but in no i case later than three years after the date such limitations are established and in no case later than March 31, 1989. l The statutory deadline of Secondary Treatment for POTWs was ! July 1, 1977 unless otherwise authorized by the Act. Compliance schedules and deadlines not in accordance with ! the statutory provisions of the Act can not be authorized by j a NPDES permit. l EPA regulations require NPDES Permits to contain effluent j limits more stringent than technology based limits.where i more stringent limits are necessary to maintain or achieve state or federal water quality standards. Water quality > standards consist of three parts, (1) numeric or narrative water quality criteria, (2) designated use, and (3) anti- j degradation requirements. : The Permit must limit any pollutant or pollutant parameter I (conventional, non-conventional, toxic and whole effluent toxicity) that is or may be discharged at a level that caused, has reasonable potential to cause or contributes to an excursion above any water quality criterion. An excursion occurs if the projected or actual in-stream concentrations exceed the applicable criterion. In determining reasonable potential, EPA considers existing controls on point and non-point sources of pollution, variability of the pollutant in the effluent, sensitivity of the species to toxicity and, where appropriate, the dilution i of the effluent in the receiving water. j A permit may not be renewed, reissued or modified with less stringent limitations or conditions than those contained in the previous permit unless in compliance with the anti-backsliding requirement of the Act (see Sections 402(o) and 303 (d) (4) of the Act and 40 CFR S122.44 (1) (2)) . In addition the permit must conform to the conditions , established pursuant to a State Certification under Section i 401 of the Act that meet the requirements of 40 CFR S124.53. EPA regulations pertaining to permit limits based upon water quality and state certification considerations are contained in 40 CFR 5122.44(d). 17
Permit No. NH0020338 F. Effluent Limitations and Conditions The act requires the Administrator of the EPA to establish for existing facilities, effluent limitations which set forth the degree of reduction attainable through the application of best practicable control technology currently available (BPT), best conventional pollutant control technology (BCT), and best available technology economically achievable (BAT) (Sections 301 and 304 of the CWA). Effluent guidelines which represent BPT and BAT are set forth in 40 CFR S423. The Act also requires EPA to obtain state certification that state water quality standards will be satisfied in accordance with 40 CFR S124.53 and S124.55. The effluent limitations presented in the permit are based on the Steam Electric Power Plant Guidelines-(40 CFR S423) as promulgated on November 19, 1982 (as amended), and on the New Hampshire Water Quality requirements. The limitations for the discharges given in Part I of the Proposed Permit are designed to maintain the nearshore Atlantic Ocean and the Browns River as Class B waterways in accordance with the state requirements. The limitations in Part I for pH and temperature have been established based on state certification requirements pursuant to Section 401(a) (1) of the Clean Water Act. The pH range for Class B marine waters is from 6.5 to 8.0 standard units (s. u.) as defined in the New Hampshire Statute RSA: 485-A8," Classification of Waters". The effluent limitations presented in_the permit for total suspended solids, Total Residual' Oxidants (Chlorine), total copper, oil / grease and total iron are based on the Steam Electric Power Plant Guidelines (40 CFR S423). The effluennt limitations for Total Residual Oxidants (Chlorine) was developed so as to ensure that the concentration of TRO at the Discharge Transition Structure t is sufficient low so that the State Water Quality standards I are met at the diffuser nozzles about 3 miles from the ' station site (5.500 feet offshore). As'noted previously, the Discharge Transition Structure is the last sampling , point between the station and the diffuser nozzles. EPA has determined that the proposed permit limitations l satisfy all the technology requirements of the Clean Water ; Act, including the 1984 BAT requirements for toxic ! pollutants and BCT for conventional pollutants. ! Review of the toxic pollutant portion of the NPDES permit application indicates that no organic pollutants were i detected significantly above detection limits except for the chemicals listed below. These chemicals are added by the permittee for the specific purposes shown. The flow rate, discharge concentration, and representative aquatic toxicity , data for the listed chemicals are presented in Attachment C. 18 i i
I i Permit No. NH0020338
- 1. Hydrazine Hydrazine is used as an oxygen scavenger in the !
secondary steam cycle system which minimizes l corrosion. This chemical is commonly used i throughout the industry as a corrosion preventative because of its non-toxic chemical i reaction products. The hydrazine concentration in l the secondary system is 0.5 mg/l during normal operation During maintenance shut-down periods, the concentration may be as high as 225 mg/1. Hydrazine reacts quickly with the dissolved oxygen in water to produce the by-products of nitrogen gas and water. Therefore, the toxic effects would l not be detectable. The Appendix C shows the discharge concentration of hydrazine into the ocean assuming only dilution without any chemical reaction. l l
- 2. Anmonia Ammonia as ammonium hydroxide maintains pH control in the steam cycle to minimize corrosion. The ammonia concentration in the secondary system may l vary up to 3 mg/l during' normal operation. l
- 3. Boron Boron as boric acid is used in the primary system I to control the ability of the uranium fuel to fission by absorbing neutrons. The concentration of boron in plant systems vary from 0 to 20,000 mg/1. Boron is a naturally occurring element and is present in nearly all fresh and marine waters.
Normally marine waters have boron concentrations of 3 to 4.5 mg/1. Therefore,_the maximum possible concentrations will not cause a detectable impact on the aquatic community. Even though boron is used to moderate the neutron flux, it does not become radioactive. l 4. Lithium hydroxide l Lithium hydroxide neutralizes the effects of boric I l acid in the primary system. This chemical helps to maintain a constant pH in the primary system, , thereby minimizing corrosion processes. The I lithium hydroxide in the primary system will be l less than 2.4 mg/1.
- 5. Hydrocen Peroxide Hydrogen peroxide is used during annual refueling outages (once every 18 months) to help remove corrosion products. By removing radioactive corrosion products from internal piping surfaces the radiation exposure of workers is minimized.
Hydrogen peroxide may also be used for l disinfection of stainless steel systems. The concentration of hydrogen peroxide in the primary 19 I
Permit No. NH0020338 system is less that 5 mg/1. This would normally be consumed within the system being converted to oxygen and water before release.
- 6. Ethylene Glycol and Propylene Glycol Ethylene and propylene glycol are used for to prevent ice formation in outdoor water systems that are not heat traced. Any discharges of these two chemicals would be inadvertent because the permittee is establishing reclaiming and reuse procedure for these chemicals.
- 7. Moreholine and Ethanolamine Morpholine and ethanolamine are chemicals commonly used throughout the industry for pH and corrosion control in boiler systems. These chemicals are not currently used at Seabrook Station. However, the permittee has requested approval for possible future use of these two chemicals to minimize corrosion and improve solubility and ease of removal of corrosion products in the steam generator.
- 8. Bulab 9328 Buckman Laboratory product 9328 is a corrosion inhibitor.
- 9. Bulab 6002 Buckman Laboratory product 6002 is a biocide.
- 10. Cat Floc TL Calgon product " Cat Floc TL" is used as a flocculent in the liquid radwaste system to enhance the removal of any particulate matter made radioactive by neutron activation. This material is used to aggregate those activation products and, thereby, improve the decontamination capability of the demineralizers.
- 11. Cat Floc L Calgon product " Cat Floc L" is also used as a flocculent as note above.
- 12. Nalcolvte 7134 Nalco product 7134 is used as a coagulant for the same purpose as the two Calgon products indicated above.
- 13. Sodium nitrite Sodium nitrite is used as a corrosion inhibitor for some of the piping systems.
- 14. Sodium molybdate '
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Permit No. NH0020338 Sodium molybdate is used as a corrosion inhibitor , for some of the piping systems.
- 15. Sodium Silicate !
Sodium silicate is used as a scale inhibitor or , preservative in some of the piping systems. The effluent monitoring requirements have been established to yield data representative of the discharges under the authority of Section 308(a) of the Clean Water Act, according to regulations set forth at 40 C.F.R. 122.41(j), 122.44(i) and 122.48. The monitoring program in the permit specifies routine sampling and analysis which will provide continuous general information on the reliability and effectiveness of the installed pollution abatement equipment. The approved analytical procedures are to be found in 40 CFR 136 unless other procedures are explicitly , required in the permit. Whole Effluent Toxicity EPA's recently published Technical Support Document for Water Ouality-based Toxics Control, March 1991, EPA /505/2-90-001,1 recommends using an " integrated strategy" l containing both pollutant specific (chemical) approaches and whole effluent (biological) toxicity approaches to better detect toxics in effluent discharges and using that l information to control the entrance of those toxic j pollutants into the nation's waterways. Pollutant-specific ! approaches such as those in the Gold Book and State ! regulations address individual chemicals, whereas, whole effluent toxicity approaches evaluate interactions between pollutants, thus rendering an "overall" or " aggregate" toxicity assessment of the effluent. Furthermore, Whole Effluent Toxicity measures the " Additivity", " Antagonistic" and/or " Synergism" effects of individual chemical pollutants ! which pollutant-specific approaches do not, thus the need
- for both approaches. In addition, the presence of an unknown toxic pollutant can be discovered and addressed j through this process. l Section 101(a) (3) of the CWA specifically prohibits the discharge of toxic pollutants in toxic amounts and State law N.H. RSA 485-A
- 8, VI and the N.H. Code of Administrative Rules, PART Env-WS 4 3 2. 02 (c) (4 ) states that, "all classes of waters shall be free from toxic pollutants or chemical constituents in concentrations or combinations that injure or are inimical to plants, animals, humans, or aquatic life;". The NPDES regulations under 40 CFR S122.44 (d) (1) (v) require whole effluent toxicity (WET) limits in a permit when a discharge has a " reasonable potential" to cause or contribute to an excursion above the State's narrative l criterion for toxicity. '
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4 Permit No. NH0020338 Region I adopted this " integrated strategy" on July 1, 1991, for use in permit development and issuance. EPA Region I modified this strategy to protect aquatic life and human health in a manner that is both cost effective as well as environmentally protective. Seabrook Station generates electrical power which has an unknown potential for causing toxicity in the facility's. discharge. Presently, there is inadequate information for EPA to base a " reasonable potential" determination concerning this discharge's toxicity potential to cause or : contribute to an excursion of the State's narrative water ! quality criterion. Thus, an inclusion of a WET testing i monitoring requirement in the draft permit is necessary, l reasonable and appropriate to gather this information in order to make a technically-based " reasonable potential" determination regarding whether or not this discharger is , unknowingly contributing toxics to the receiving water. ; This approach is consistent with that recommended in > Technical Support Document for Water Ouality-based Toxies ; Control, March 1991, EPA /505/2-90-001 on page 60.
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This WET test monitoring approach is a proactive stance , taken by EPA to protect the' environment so as to properly carry out EPA's Congressional mandate to prevent the ! discharge of toxic substances into the Nation's waterway. ! EPA cannot make a " reasonable potential" determination on an individual discharge without first evaluating WET tests ! results obtained from a-given facility's discharge. . Therefore, the draft permit is conditioned to require the I permittee to report the results of chronic (and modified [ acute) WET test using Inland Silverside (Menidia bervilina), ! for two separate sampling periods, once during January 1994 ! and once during July 1994, at Outfall 001. A 24-Hour composite sample is the required " sample type" for WET testing. This monitoring requirement is new to this draft permit and is not contained in the current permit. l If these Whole Effluent Toxicity tests detect toxicity, the [ Regional Administrator and the Director may decide to modify , the permit to include a toxicity and/or additional pollutant i limits to adequately protect the State's Surface Water ; Quality Regulations and assigned uses of the waterway during ! the remaining life of the permit. Results of these toxicity l tests are consider "new information not available at permit development"; therefore, the permitting authority is allowed , to use this information to modified an issued permit under , authority in 40 CFR S122.62(a) (2) . l l l 22 i i
Permit No. NH0020338 G. Proposed and Existina Permit Effluent Limitation Reauirements Attachment B presents a comparison of: (1) the data from the self-monitoring program (Discharge Monitoring Reports) summarized for 1990-1991 data representing operational plant t conditions; (2) the existing permit effluent limitation requirements; and (3) the draft permit effluent limitation ! requirements showing the proposed changes to the existing permit. The existing Seabrook Station NPDES Permit (issued on July 26, 1985) was based upon designed conditions. The proposed permit will have only several non-significant changes based upon the actual operational data. These changes are: [
- 1. The increased flow rates for Discharge Nos. 001 and 003 i because of the more efficient pumps and the use of a
- conservative friction factor in the tunnels.
- 2. The discharge flow rate for Discharge 025 was increased because operational conditions indicated that the increase is necessary for the possibility of continuous blowdown.
- 3. Several changes were made due to changes in the New Hampshire Water Quality Standards: turbidity, settleable solids, and Coliform.
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- 4. The pH requirement was deleted from several fresh water type internal streams because the reaction of these ,
streams with the chemicals inherent in marine waters is considered to be an acceptable treatment system (the chemical buffering capacity of marine waters). This ' type of treatment has been approved nationwide for many of the shoreline power plants. There is a pH requirement, however, on the final discharge into the j ocean. l A total of about 1 mgd of several internal discharges are diluted by about 720 mgd of the circulating cooling water system. This 720 to i ratio is equivalent to a change of 2.8 pH standard units (s.u.) by simple dilution alone. Recent tests have shown that 100 ml samples of fresh i water with a pH of 11.0 and 2.0 s.u. will be reduced to l 8.9 s.u. (titrated pH) with 65 ml of sea water and raised to 6.7 s.u. With 800 ml of sea water respectively. This would indicate that the circulating cooling water system could chemically neutralize 1108 mgd of plant discharges at a pH of 11.0 s. u. or 90 mgd of at a pH of 2.0 s.u. without considering any dilution factor. These tests were repeated using salt water samples. This information is summarized below: l l 23 l l l . .
Permit No. NH0020338 Averaae Max. l Samole Water _ Sea Water Titrated Plant Flows Plant j volume EH volume pH Coolina Stream stream m1 s.u. ml s.u. mgd mgd mgd l Fresh Water 100 11.0 65 8.9 720 1 1108 l' 100 2.0 800 6.7 720 1 90 Salt Water 100 11.0 6000 8.5 720 1 12 100 2.0 800 6.7 720 1 90 H. Bio-foulina Control. The chlorine effluent limitations presented in the permit - are based on the Steam Electric Power Plant Guidelines (40 CFR 423). The guidelines state that Total Residual Chlorine (Total Residual Oxidants for ocean waters) may not be discharged from any single generating unit for more than two ' hours per day. Simultaneous multi-unit chlorination is ' permitted. The quantity of Total Residual Oxidants (TRO) discharged in once-through cooling water from each discharge point shall not exceed a maximum concentration of 0.20 mg/1. The guidelines require the discharger to demonstrate to the permitting authority that chlorine discharge for more than two hours a day is required for macroinvertebrate control. The applicant has made such a demonstration for the cooling water system. Therefore, continuous chlorination of the cooling water system is allowed, provided that the 0.2 mg/l Total Residual Oxidant limitation is not exceeded at the > point of discharge into the Atlantic Ocean. The Discharge , Transition Structure (DTS) is the last and only location where the total combined plant wastewater discharge can be sampled before it enters the head end of the discharge tunnel. There is no sampling point between the DTS and the diffuser nozzles. Originally, the permittee had anticipated that the macroinvertebrate control would be solely through the use of a " thermal backflushing technique". This is a process wherein the cooling water flow through Seabrook Station is : reversed so that the intake structure becomes the discharge point and the discharge diffuser nozzles are the intake , l ports. During this flow reversal, the cooling water i discharge temperature would be increased to a maximum of l 120 *F for a duration not to exceed 2 hours. This thermal l backflushing operation would be conducted only during those i time intervals when the meteorological and hydrological l conditions would minimize any thermal impact upon the Outer l and Inner Sunk Rocks area. Under current plant operational l plans, this method of biological growth control will be used ] l 24 1 1
I Permit No. NH0020333 i l only infrequently to control those plant or animal growths l that are resistant to continuous chlorination program or in j areas not impinged upon by the injected chlorine. l l EPA is requesting the permittee co revaluate the use of l thermal backflushing as the best procedure to control the i sessile organism growths resistant to sodium hypochlorite. The permittee is to examine and describe alternative , procedures that could be effectively used to minimize the environmental impact on the biological community. The study shall determine conditions and seasons that will produced the least environmental impact such as: fish migration, : spawning, endangered species, initial dilution, and dispersion of the plume. Should the thermal backflushing be considered the best alternative, then the existing approved hydrological and i
- meteorological report developed for protecting the outer l Sunk Rocks aquatic community shall be expanded to include the above additional requested data.
This study shall submitted to EPA, the State and the TAC before the selected alternative is used to control the ; sessile organisms in the Intake Tunnel or by January 1, ; 1995, whichever comes first. l l l The permittee has shown in experimental testing and through . i actual operations that sodium hypochlorite continuously introduced at the cooling water intake structures could control most of the macroinvertebrate growth and satisfy the Steam Electric Power Plant Guidelines on the maximum TRO ; (chlorine) discharge limitations. ! The permit limits the maximum Total Residual Oxidants (TRO) (the term " Total Residual Chlorine (TRC)" is used in place of TRO in fresh waters) to 0.15 mg/l prior to mixing with the ocean waters. i As two additional conservative factors should be considered. in evaluating the impact of the TRO (chlorine) in the discharge from the diffuser nozzles into the marine waters: the dilution of the TRO by the entrained ocean waters and the chemical reaction of the entrained marine waters with the residual TRO in the station discharge.
- 1. The station discharge is diluted at the discharge j nozzles with approximately about 10 volumes of l entrained cold ocean water reducing the maximum concentration TRO of 0.150 mg/l to about 0.015 mg/1.
- 2. The calculated maximum TRO concentration of 0.015 mg/l is further reduced by its reacting with the new entrained sea water. It is expected that the highest concentration at the ocean surface above the diffuser nozzles will be about 0.00062 mg/1. This value is below both the level for Acute Toxic limit of 25
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I Permit No. NH0020338 - 0.013 mg/l and for the Chronic Toxic of 0.0074 mg/l l recommended by EPA in the " Ambient Water Quality l Criteria for Chlorine" (49 Fed. Reg. 4553 dated ! February 7, 1984). This conservative approach assumes maximum discharge ; i concentration of TRO of 0.150 mg/1. However, historical l data has shown that TRO level at the Discharge Transition i ! Structure has been well below 0.150 mg/l (consistently l approaching the "no detect concentration of 0.050 mg/1). l The goal of the Chlorine Management Program is to minimize the seasonal usage of chlorine at Seabrook Station. The NPDES permit allows the permittee to submit proposed changes j to the approved Chlorination Management Program annually ; together with the proposed changes to the Biological and i Hydrological Monitoring Programs. These changes would allow ! for accommodating changes: in different types of organisms i growing in the tunnel, the change seasons when chlorination is necessary, and the change in dosage levels for to control j different organisms or greater population of some' organism. i
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4 It is anticipated that the thermal backflushing operation will be used only infrequently to control those organisms' ! l that are resistant to chlorination, located upsteam of the chlorination points in the intake structures and to provide station operator training-for this equipment. ; l The monitoring program in the permit specifies routine ! l sampling and analysis which will provide general information l on the reliability and effectiveness of the installed [ pollution abatement equipment. l
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I. Section 316 of the Clean Water Act ; i Section 316(a) of the Clean Water Act (CWA) addresses the thermal component of any effluent discharge. EPA has not l developed the Best Practicable Control Technology currently f available (BPT) for thermal discharges from point sources. However, EPA assumes that if thermal limits satisfying BPT : were developed in accordance with Section 301(b) (1) (A) of j the CWA, they would be more stringent than what would be ! proposed by the NPDES Permit applicant. This is based upon ; the premise that the water quality criteria developed by ! states would be the limiting factor in the development of the NPDES Permit. It should also be noted that thermal ' j discharges (heat) are not subject to the technology standards required by Best Conventional Pollutants Control Technology Economically Achievable (BCT) since heat is not i identified as a toxic pollutant or a conventional pollutant j as defined by the CWA and outlined in 40 CFR S401.15 and j S401.16.- Rather, thermal discharges (heat) are treated as a ; separate type of pollutant under S316 of the CWA. {
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i i , l Permit No. NH0020338 l l Section 316(a) of the CWA gives the Administrator of the EPA , l the authority to impose alternative effluent limitations for j the control of the thermal component of any discharge. However, the owner or operator of the point source must demonstrate to the satisfaction of the Administrator that i existing effluent limitations are more stringent than necessary to assure the protection and propagation of a ; balanced indigenous community of shellfish, fish and wildlife in and on the receiving water. Similarly, Section 316(b) of the CWA gives the Administrator of the EPA the authority to determine if the location, design, construction, and capacity of the cooling water intake structures reflect the BPT for minimizing environmental impact. Authority of these two sections of the CWA has been i delegated to the Regional Administrator or their designees t in accordance with the regulatory procedures under 40 CFR l 5125. Technical Advisory Committee (TAC) In 1975, EPA and the State jointly formed a committee of the l senior biologists of the those regulatory agencies which have responsibility for the aquatic community in Hampton Harbor and in the nearshore waters at Hampton Beach /Seabrook, New Hampshire: U. S. Environmental Protection Agency, Region I Environmental Services Division (Biological Lab.) U. S. Environmental Protection Agency, Region I l Water Management Division (NPDES Permit) i U. S. National Marine Fisheries Service New Hampshire Division Environmental Design Water Pollution Section l New Hampshire Department of Fish and Game
- North Atlantic Energy Service Company (non-voting)
The objective of forming the committee was to provide EPA l and the State the combined biological expertise of the previously mentioned agencies which are responsible for different biological aspects of the Hampton Harbor and the nearshore Atlantic Ocean. The Committee has been responsible for assisting the permittee in developing study programs, evaluating the resulting data, reviewing program conclusions,and approving / rejecting the proposed remediation by the permittee. The committee also provides EPA recommendations for inclusion in the proposed NPDES Permit l that will ensure protection of the ecological community in and on receiving waters. This type of formal biological committee has been effectively used by EPA, Region 1, for other large power 27 l l
Permit No. NH0020338 plants to take advantage of the extensive technical expertise available in those Federal and State agencies that have regulatory functions on the receiving waters. These committees are of particular help to EPA when monitoring a power plant: (1) that is discharging into sensitive ! biological areas; (2) that is trying to select a site of minimum environmental impact; and (3) that is attempting to verify that its operational discharges satisfy the predicted environmental impacts. I In this permit reissuance, the biological committee of Federal and State biologists is being formalized into a Technical Advisory Committee (TAC) to ensure that their i efforts are an official part of this permit. This group has i been on a more informal basis coordinating, reviewing, and i I commenting upon the Pre-Operational and Operational l biological, hydrological, and chlorination programs at Seabrook Station since 1975. The TAC members shall be competent biologists from the following Federal and State regulatory agencies: NHDES, NHF&GD, and USEPA. North Atlantic Energy Service is also represented on this l committee as a non-voting member. The TAC may accept, reject, or modify the proposed programs and schedules. After acceptance of the program and schedule by the TAC, the program will be submitted to the Regional Administrator and the Director for NH WS&PC Division for
- approval. Upon approval, the proposed program and schedule l
becomes an enforceable element of this permit. After permit reissuance, the permittee may annually, on January 1st each year, submit proposed revisions of the existing biological, hydrological and chlorination monitoring programs included herein to the Regional Administrator and the Director. Upon approval, by the TAC, the revised biological and/or hydrological monitoring programs shall become an enforceable element of this permit. Each time the permit is reissued (not to exceed 5 years), the 316(a) and (b) determinations are reviewed. The permittee must certify any changes in: (1) the facility discharge characteristics; (2) the waterway characteristics, l l and (3) resident or transient aquatic community. The permittee must then explain any differences identified and their impact on the local ecological community. A new amended determination is then made on this incremental change in the environmental conditions at the facility based upon the recommendations of the TAC. After consultation with the biological committee (to be known as the TAC), the Regional Administrator has tentatively determined that the current biological, hydrological and chlorination monitoring data satisfactorily show that a once-through cooling system for Seabrook Station satisfies the State of New Hampshire thermal requirements l l 28 r
Permit No. NH0020338 and will insure the protection and propagation of a balanced indigenous community of fish, shellfish, and wildlife in and on Hampton Harbor and the nearshore Atlantic Ocean. The thermal limits proposed in the draft permit constitute a Section 316(a) thermal discharge variance. The operational phase biological monitoring program, as directed by the TAC, continues in order to assure EPA and the State that the continued operations of Seabrook Station does not significantly impact the local biological community. l The Regional Administrator has also tentatively determined l that the location, design, construction, and capacity of the intake structures and rotating screens reflect the best available technology for minimizing adverse environmental impact upon the nearshore ecological community, Section
- 316(b) of the CWA.
It is to be noted that these CWA S316 tentative l determinations were made on the data as presented by the permittee and his consultants during the plant construction (17 years) and upon the biological and hydrological data obtained since Seabrook Station became operation in August 1990. Because of the complexity of the biological processes in ocean and harbor, the biological committee (now the TAC) has continued (over 17 years) to be very active in supervising the biological and hydrological monitoring
- programs for Seabrook Station. The draft permit includes the l provision that these programs can be changed annually to reflect changes in the biological community, hydrological conditions, and plant operations. The TAC can, thereby, obtain additional data on any perceived biological problem area and make appropriate recommendations to the Regional Administrator and Director to modify the issued permit to enhance the protection of the biological community in ocean or harbor.
The proposed draft permit effluent limitations and special conditions assure satisfaction of the New Hampshire State Water Quality standards for Hampton Harbor and the nearshore Atlantic Ocean and Sections 301, 316(a), and 316(b) of the l Clean Water Act. J. Criteria for Cooling Water System. The criteria for the Seabrook Station Cooling Water system effluent limitations have been derived from the following documents:
- 1. Public Service Company of New Hampshire Application for an NPDES Permit for Seabrook Station date August 1, 1974 (original plant design).
- 2. Public Service Company of New Hampshire Application for a Permit to Discharge or Work in Navigable Waters and their Tributaries dated October 25, 1974.
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l Permit No. NH0020338 -
- 3. Regional Administrator's Determination dated March 18, i
1975, relating to the Thermal Component of'the Discharge. j
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Regional Administrator's Determination dated June 24,
- 4. !
1975, relating to the Thermal Component of the l Discharge.
- 5. Regional Administrator's Determination dated October i 24, 1975, relating to Cooling Water Intake Structure Location and Design.
- 6. Regional Administrator's Determination dated.' November 9, 1976, relating to the Intake Structure and the Thermal Discharge.
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- 7. Administrator's Decision dated June 10, 1977, relating 'l to the Appeal of the Regional Administrator's Initial l i
Decision. t i
- 8. Administrator's Modifications of Determinations dated November 7, 1977, relating to modification of (3) and (4) above.
- 8. Administrator's Decision on Remand l dated August 4, I 1978. +
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- 9. Steam Electric Power Generation Point Source Category l Effluent Limitations Guidelines 40 C.F.R. 423. ,
- 10. Public Service Company of New Hampshire application l and addendum for the NPDES permit.for Seabrook Station dated February 21, 1990, and April'5, 1991, l
respectively. l l l 11. U.S. Nuclear Regulatory Commission Final Environmental j l Statement.Related to the Operation of Seabrook Station l l Units #1 and #2, _ dated December 1982. ; i K. Thermal Effluent Limitations i The Seabrook Station had been designed to have two units each generating about 1200 MW (gross) of electrical energy.
~
Seabrook Station was constructed as a single unit station with a once-through cooling water Circulating Water System that uses approximately 720 MGD of water from the Atlantic Ocean. i The three intake ports'are about 7,000 feet from the shoreline and the eleven diffuser nozzles are about 5,500 from the shoreline. The temperature rise of the effluent is limited to 39 F on a daily average and 41 F.on a daily-maximum, thus insuring that the surface waters above the l 30 l'
Permit No. NH0020338 i nearfield jet mixing region within 300 feet of the discharge point will not exceed 5 F above ambient water temperature. EPA has reviewed the impact potential to aquatic resources from operation of the Seabrook Station cooling system under Section 316(a) and (b) of the Clean Water Act. A series of decisions and legal actions on the design and impact of the ' cooling system led to an August 4, 1978 Decision on Remand by the EPA Administrator. Considered in the Decision on i Remand were the potentials for an impact from: thermal discharges; thermal backflushing for biofouling control; cold shock; discharge plume scoering of the ocean bottom; entrainment of plankton through the cooling system; attraction of fishes to the intake structures; entrapment of fishes, at the intakes and subsequent impingement on the traveling screens; thermal plume barriers to migrating fish; increase in nuisance species populations; and gas bubble disease of fish. The Decision on Remand concluded that: (1) the requirements of Section 316(a) and (b) of the Clean Water Act have been met: (2) the once-through cooling system will ensure the protection and propagation of a balanced indigenous population of fish, shellfish, and wildlife in and on the receiving waters with respect to the thermal components of the discharge and in accordance with limitations imposed in the proposed NPDES permit; and (3) the intake structures reflect the best available technology for minimizing adverse environmental impacts to the aquatic biological and fishery resources of Hampton Harbor and ! t nearby coastal waters. The National Marine Fisheries Service (NMFS), U.S. Department of Commerce, responded to the NRC request for information on endangered and threatened species near Seabrook. The response stated that the operation of Seabrook Station will not affect the endangered shortnose sturgeon or the habitat of the offshore whales and sea turtles. EPA is currently reviewing with NMFS this original decision on tne endangered species based on the pre-operational and on the recent operational data at Seabrook Station. The thermal component of the discharge shall in all aspects be in accordance with the discharge described in the permittee's NPDES Permit Application No. NH0020338, dated August 1, 1974, as modified in the reapplication dated April 5, 1991, except as specifically modified in accordance with the decisions / determinations referenced above:
- 1. The permittee shall perform back-flushing (cooling water flow reversal for bio-fou:.ing control) only during times when hydrological and ratmocological conditions are such that the plume 1.1au off-shore and/or temperature increases are min.:nzed at the Outer Sunk Rocks. The permittee shall notify the Regional 31
t Permit No. NH0020338 Administrator and the Director 15 calendar days before each back-flushing operation is initiated.
- 2. The thermal component of the discharge from the Seabrook Station shall not cause a temperature rise of more than 5.0 F in the "near-field jet mixing region".
The 5 F limit shall apply only at the surface of the receiving waters. For the purposes of this paragraph the "near-field jet mixing region" means that portion of the receiving waters within 300 feet of the submerged diffuser in the direction of discharge. This paragraph shall apply only to temperature rises to the extent caused by the addition of heat to the receiving waters by the permittee. This temperature requirement does not apply during the cooling water flow reversal (thermal backflushing) used for biological control.
- 3. During operation of Seabrook Station, the permittee shall conduct such studies as are determined by the Regional Administrator and the Director to be necessary to evaluate the accuracy of the thermal plume predictions it has submitted to EPA in support of the NPDES Permit Application No. NH0020338 for both normal operation and thermal back-flushing operations.
- 4. During operation of the Seabrook Station, the permittee shall conduct such studies as are datermined by the Regional Administrator and the Director to be necessary to continuously monitor and evaluate tile effect of the Seabrook Station on the balanced, indigenous population of shellfish, fish and wildlife in and on the body of water into which the discharge is made. The proposed plan submittal shall be in accordance with Paragraph I.A.10 of this permit.
- 5. NPDES Permits issued from time to time in regard to the discharges from Seabrook Station will contain such i further limitations or be modified to contain such further limitations on the thermal component of the discharge as the results of the above studies and other I
available information indicate to be necessary to assure the protection and propagation of a balanced indigenous population of shellfish, fish and wildlife j in and on the receiving waters. )
- 6. The effluent limitations of this permit shall apply to j all thermal components of the discharge from the l Seabrook Station, including but not limited to discharge during normal station operation and discharge during cooling water flow reversal for bio-fouling control.
' 7. The permittee has coated the external surfaces of the diffuser with a material approved by the Regional Administrator and the Director that discourages the 32
i Permit No. NH0020338 growth of marine organisms on the diffuser which might attract browsing fish which would then be susceptible to entrapment during the reversed flow back-flushing ; operation. The permittee may propose alternate ; chemicals or methods for minimizing biological growth on the diffuser nozzles to the Regional Administrator and the Director for approval. ' 8. EPA has rquested a revaluation of the thermal , backflushing operation to determine if there are currently alternative procedures that have less , environmental impact to the aquatic biological community. (See Section H, Bio-fouling Control, for j details of this study.) The Regional Administrator has tentatively determined that the biological and hydrological monitoring data l satisfactorily indicated that a once-through circulating cooling system for Seabrook Station would insure the protection and propagation of a balanced indigenous community of fish, shellfish, and wildlife in and on the nearshore Atlantic Ocean. The thermal limits proposed in the draft permit constitute a Section 316(a) thermal discharge variance. The operational phase biological monitoring program, as directed by the biological monitoring committee, continues in order to assure EPA and the State that the continued operations at Seabrook Station does not significantly impact the local aquatic biological community. L. Intake coolina Water System and Structures The design, construction, and capacity of all components of the cooling water system seaward of the inlets to the main condensers or other heat exchangers, as appropriate, of the Seabrook Station (the " Cooling Water Intake Structures") shall in all respects be in accordance with NPDES Permit Application No. NH0020338, as submitted on August 1, 1974, and the Permittee's Application for a Permit to Discharge or Work in Navigable Waters and their Tributaries, submitted to the Corps of Engineers by letter of October 25, 1974, except as specifically modified in accordance with the decisions / determinations referenced above:
- 1. The cooling water intake structure shall have three intake ports.
- 2. The permittee shall use an anti-fouling protective coating on the cooling water intake structures. The multiport diffuser shall be maintained free of marine fouling organisms. (The objective of this paragraph is to discourage the growth of organisms which might attract browsing fish which would then be susceptible to entrapment.)
33
l l Permit No. NH0020338
- 3. The velocity of water as it enters the cooling water intake structures shall at no time exceed 1.0 foot per ;
second. .
- 4. The cooling water intake structures shall incorporate such behavioral or other non-structural deterrents and barriers as the Regional Administrator and/or the Director determines to be appropriate under Section 316(b) of the Clean Water Act after reviewing the results of any permittee conducted studies and any other information available.
- 5. NPDES Permits issued from time to time in regard to the '
cooling water intake structures for the Seabrook Station will contain such further limitations and - requirements or be modified to contain such further limitations and requirements as the results of any studies by the permittee and other available information indicate to be necessary to minimize l i adverse environmental impact from the cooling water , intake structures. j r The Regional Administrator has tentatively determined that ; the circulating water intake structure presently designed employs the best technology available for minimizing adverse environmental impact. No change in the location, design or capacity of the present structure can be made without prior approval of the Regional Administrator and the Director. , The present design shall be reviewed for conformity to regulations pursuant to Section 316(b) when such are l promulgated. i M. Tentative CWA Determination I The Clean Water Act established the national objective "to restore and maintain the chemical and biological integrity i i of the Nation's Water." The act requires the Administrator of the EPA to establish, for existing facilities, effluent limitations which set forth the degree of reduction attainable through the application of best practicable control technology currently available (BPT), best conventional pollutant control technology (BCT), and best available technology economically achievable (BAT) (Sections ' 301 and 304). The act also requires EPA to obtain state { certification that water quality standards will be satisfied. Effluent guidelines which represent BPT and BAT are set forth in 40 CFR Part 423, and regulations governing state certification are set forth in 40 CFR Sec. 124.53 and l 124.55. l 1 EPA has tentatively determined that the proposed draft i permit, effluent limitations and special conditions assure i satisfaction of the New Hampshire Department of 34 l
Permit No. NH0020338 Environmental Services requirements for the Browns River and Atlantic Ocean and S 301 of the Clean Water Act. The Regional Administrator has tentatively deterv.ined that a favorable 316 (a) and (b) determination con 11 be, made current pre-operational and operational data. The proposed draft permit is also consistent with the Administrator's
- previous 316(a) and 316(b) determinations.
The effluent monitoring requirements have been established to yield data representative of the discharges under the ' authority of Section 308(a) of the Clean Water Act, i according to regulations set forth at 40 CFR 122.41(j), i 122.48, 122.41(j) (4) . (5) , and 122.44(i). V. State Certification Requirements. EPA may not issue a permit unless the New Hampshire Department of Environmental Services which has jurisdiction over the receiving waters certifies that the effluent limitations contained in the permit are stringent enough to ; assure that the discharge will not cause the receiving water to violate State Water Quality Standards. The staff of the New Hampshire Department of Environmental Services has reviewed the draft permit and advised EPA that the limitations are adequate to protect water quality. EPA has requested permit certification by the State and expects that the draft permit will be certified. VI. Comment Period, Hearing Requests, and procedures for Final Decisions. 1 All persons, including applicants, who believe any condition i of the draft permit is inappropriate must raise all issues j and submit all available arguments and all supporting i material for their arguments in full by the close of the public comment period, to the U.S. EPA, Compliance Branch, JFK Federal Building, Mail Code WMN, Boston, Massachusetts 02203. Any person, prior to such date, may submit a request in writing for a public hearing to consider the draft permit to EPA and the State Agency. Such requests shall state the J nature of the issues proposed to be raised in the hearing. ' I A public hearing may be held after at least thirty days l public notice whenever the Regional Administrator finds that response to this notice indicates significant public interest. In reaching a final decision on the draft permit the Regional Administrator will respond to all significant comments and make these responses available to the public at EPA's Boston office. Following the close of the comment period, and af ter a public hearing, if such hearing is held, the Regional Administrator will issue a final permit decision and forward 35 l
^
Permit No. NH0020338 i l a copy of the final decision to the applicant and each person who has submitted written comments or requested notice. Within 30 days following the notice of the final permit decision any interested person may submit a request for a formal hearing to reconsider or contest the final decision. Requests for formal hearings must satisfy the requirements of 40 C.F.R. Section 124.74, 48 Fed. Reg. 14279-14280 (April 1, 1983). VII. EPA Contact. l Additional information concerning the draft permit may be obtained between the hours of 9:00 a.m. and 5:00 pm., Monday through Friday, excluding holidays from: T. E. Landry, Jr. John F. Kennedy Federal Building, WMS Boston, Massachusetts 02203 Telephone: (617)S65-3508 i i 2 7'2 II$ 7 David A. Fierra, Director Water Management Division
/ 'Date Environmental Protection Agency l !
36
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Permit No. Nit 0020338 7-7 UlI20338.FS2 ATTAQ MEIE B . DESGIIPTION OF DISQiAME: DISOIARGE No. 001--Circulating Water System Discharge (combination of condenser once-thru cooling water frun Unit #1, all process wastewaters, the treated sanitary wastewater, and all plant site storm water runoff). PEIMIT EF1Mir QIARACTERISTICS AT POINF OF DISGIAME: Summary 1990/92* Existing Permit Proixsed Permit DiR Reports Conditions Conditions Parameter Averace Maximum Averace Maximum Averace Maximum Flow, MGD 580 593 594 - Report 720 Flow rate increased because i installed equipment more i efficient than designed.
^ "#
I N)' g ' 77.3 85.8 - - No limit change. Will require i w ting Daily Average and Range without limits. 1 Temperature Rise, Delta-T, F 32.2 38.2 39 41' No limit change. R @ ort Monthly. Avg. and Daily Max. Total Residual 011orine 0.150 0.150 (Tao), ny/l o.1 0.1 o.2 0.2
- to - 6.5 to 8.0 No limit change pli, s.u. (Range) **
j o 'Ibe 34R data is a summary of the operational data from Seabrook Station start-up in August 1990 to Mardi 1992. o* 'nic pli of the discharge shall not be less than 6.5 standard units nor greater than 8.0 standard units or as naturally occurs in the recx31ving waters, NII DES Water Quality Standards. 'Ihe pH of the marine waters at the Intake Transition Structure shall be considered as the receiving water pH for this permit. 4 1 i i
-- ,- ee-.. -,_, _ - . , -,_-_._,_,._.,_,,,,,,m,____,, _ , , , , _ , , , _
Permit fio. 11110020338 ATTAGiMDTP B DESCRIPTION OF DISQlAME: DISOIAME 002--Settling Basin Discharge (Combined storm water runoff, treated sanitary waste, and secondary Icakage (floor drains), and all plant area storm water runoff.) *
- PER4IT EFFIlIDTP OIARACTERISTICS AT POIITT OF DISGIARGE
Summary 1990/92 Existing Permit Propocci Permit IER Reports Conditions COMitions Maximum Averace Maximum Averace Maximum , Parameter . Averace O.8 2.9 - 41.5 No limit change. Flcu, MGD 15 31 30 100 No limit change Total Suspended Solids, mg/l 1.0 1.9 15 20 No limit change Oil aM Grease, ng/l
- 19.1*** -
25 Deleted, new IDI 7brbidity, Jr0 requiu:ura ds. i 5.5 to 9.9*** 6.5 to 8.0** No limit change pII, s.u. (Range)
-* 1. When there is no flow in the coolirry water discharge tunnel or during equipment maintenance, the following may be diverted to this treatment facility: oooling tower blowtiown, treated domineralizer regenerants, and secondary plant leakage.
- 2. This discharge will be directed to tunnel discharge, Discharge 001, eliminating all discharges to the Browns River. The diverted stream Discharge 002 will continue to be so designated since the chemical '
characteristics are essentially the same before aM after the diversion. oo 7he pH of the discharge shall not be less than 6.5 staMard units nor greater than 8.0 standard units or as naturally occurs in the receiving waters,101 DES Water Quality Standards. The pH of' the marine waters at the Intake Transition Structure shall be considered as the receiving water pH for.this permit. oco There were 8 exceedances above 8.0 s.u. and 3 turbidity exceedances above 25 JIU attributed to naturally occurring algal blooms in settling pond due to a relatively low flow rate into.a very large settling pond (resident time could exceed a month). 2 ______-___m_ _______-..__ww - - _-cw-w www. - e w.r ww. . w e= + rw T--e-v-r wwe,t-~=w wr v w r +, v -*.-.-wr,~-=v c-ww-,w-= w- i .w--+---irrr-#- a r- v-.-w w-~ m.-rw ww,r,,rri . ___-______2 _-,rv _
Permit No. N110020338 [ ATTAOiMBir B DESCRIPTION OF DISOIARGE: DIS 01ARGE 021--Treated Sanitary Waste (The treated effluent flows into settling basin, whose outflow is Diccharge 002.) PDMIT EFF1UDir CIARACTERISTICS AT POIlff OF DISOIARGE: Summary 1990/92 Existing Permit Proposed Pemit DMR Reports Conditions Conditions Average Average Maximum Average Average Maximum Average Average Maximum
-Weekly Daily Monthly Weekly Daily-. Monthly Weekly Daily Parameter Monthly ,
I FlcW, EGD 0.04 - - 0.05 - - No limit change DOD, ng/l 12.0 20.2 20.2 30 45 50 One limit change. Delete Weekly avg.-1/ week sarple i Total GusIrnded 30 45 50 One limit' change. See above. Solids, mg/l 4.6 9.2 10.5 Total Residual . Chlorine - - 5.0 No limit change (TRO) , mg/l - -- 4.3 Total Coliform,
- 9.7 9.7 - 70 70 No limit change.
ITN/100ml Settleable
- 0.1 0.1 - 0.1 0.3 Deleted, new 101 i Solids, ml/l requitumait j No Sheen Reported No Visible Sheen No limit change Oil / Grease 6.5 to 8.0 No limit change pli, s.u. (Range) 7.1 to 8.4*
Total Metals, Sludge, ng/l New Requirement - -
- New 0% Requirement '
1 (Cu,01, Cr, Pb, Ni, Zn)
- There was 1 exceedance above 8.0 s.u.
1 l i 3
Permit No. Nif0020338 ATTACH 4F2TT B DESCRIPTION OF DISOfAME: DISCIAEE No. 022 Secondary Plant Irakage, Vault #1 PEF 44IT EFFEM2fr CIARACTERISTICS AT POIlfr OF DISQlARGE: Summary 1990/92 Existing Permit Proposed Pernit DMR Reports Cbrditions Conditions Averaqe Maximum Averace Maxirum Averace Maximum Paramter 38,000 62,700 Report Report No limit change Flow Rate, gpd 1.4 2.5 15 20 No limit change Oil and Grease, mg/l 2.0 3.1 30 100 No limit change Total SuspeJxicd Solids, m3/1 6.0 to 9.0 Deletal rcquirement. pli, s.u. (Range) 4 y - - --- - - - . - _ - -
- _ _ _ _
___.2 _ _ _* -_______-___m_.____ _ _ _ _ _ _ _ _ _ _ _ _ _
~
Permit No. HII0020338 ATTAQlMDir B DE'3CRIPTION OF DISCIARGE: DISQlARGE No. 023 Socorrlary Plant Irakage, Vault #2 PDMIT EFFLUDir CIARAC11RISTICS AT IOUTP OF DISCIARGE: Summary 1990/92 Existing Permit Frei hw.d Permit DMR Reports Cbnditions Corr 11tions Averaqe Mwimum hverace Mwinum Averaae Kulmum Parameter 54,700 79,000 Report Report No limit change Flow Rate, gpd Oil and Grease, mg/l 1.5 3.2 15 20 No limit change 1.2 3.2 30 100 No limit change Tbtal Suspended Solids, mg/l 6.0 to 9.0 Deleted requirement. pil, s.u. (Range) 5
~
Permit No. NII0020338 ATTAQlMDTP D DESCRIPTIOli OF DISCIADGE: DISQIMGE No. 024 Secondary Plant Leakage, Vault #3 PD441T EFFIJJDir QIARACTERISTICS AT POINT OF DISCIMCE: Sumnnry 1990/92 Existing Permit Propoced Pemit Et4R Reports Conditions Corrlitions Averaqe M1ximum Averaqe Maximum Averace l'aximum Paramrter Flow Pate, gpd 1,870 5,340 Report Report No limit change Oil and Grease, mg/l 0.6 3.1 15 20 No limit change 12.6 30 100 No limit change Total Suspen. led Solids, mg/l 5.8 6.0 to 9.0 Deleted rcquirement. pII, s.u. (Range) 6 m . _, _ _ , n-, - . . , - , er ,,,--, ,-,, , -.,,,.-n---- ,, -, , , , - - - , . -
Permit No. NII0020338 ATTAQMDir B DESCRIPTIOli OF DIS 01ARGE: l DISQlARGE 025-Liquid Waste Distillate and Steam Generator Blowdown and Recovery Regeneration simp neutralized haste. PDMIT EFT 11TDTP GIARACITRISTICS AT IVD7F OF DISQiARGE: b W 1990/92 Dcisting Permit Proposed Perttit IITR Reports Cotrlitions Conditions Parameter Avernae Maximum Averacto Maximum Averacie Maximum Flow, gpd 17,600 25,400 60,000 Report Report 300,000 Increase necessary for continuous blowdown possibility. Oil atx3 Grease, irry/l 1.4 5.0 15 20 No limit change Total suspended Solids, IxJ/1 10.4 58.9* 30 100 No limit change pit, s u . (Range) 6.0 to 9.0 Deleted requirement. o There were 2 exoecdances above 100 mg/1. Note: 'Ihe discharge of radioactive materials shall be in acrordance with the requirements of the Nuclear Regulatory Comission (10 CFR 20 and the Seabrook Station Technical Specifications) . 7
. , , . -. - _ . _-. - _ . =.- . .. . _ . .
Permit No. NH0020338 ATTAGIMDir B , DESGtIPTION OF DISONUE: DISOIARGE 026-' Treated 01cmical C1 caning Wastes from portable facilities. PHMIT EFFUJUTP Q{ARACTERISTICS AT POR(T OF DISQiARGE: Summary 1990/92 Existing Pennit Proposed Pennit DMR Reports Conditions Conditions Averace Maximum Averaae Maxim 3m Average Maximum Parameter 0* O - - No limit change Flow, gpd 0 0 15 20 No limit change Oil and Grease, mg/l 0 0 1.0 1.0 No limit change 7btal Copper, mg/l 0 0 1.0 1.0 No limit change Total Iron, mg/1. 0 0 1.0 1.0 Deleted, Marine Water Disposal Phosphate, (as P), my/l 0 0 30 100 No limit change Total Suspended Solids (TSS), wJ/1 O to 0 6.0 to 9.0 No limit change pH, s.u. (Range) o 01cmical treatment facilities not used during this period.. i 8 . -- - _-_-_._.....e4c.y. %..,..m..~%. -.--.e-..e...-._e...~.v....,-er. 4.%,,.c+,%=..w.w%-, ,i----,...--._.u.-..-xme..a.-..--. .-.--w,._.-_.,-
Permit tio. NH0020338 ATTAGMHTr B DESCRIPTION OF DISQiARGE: DISCHARGE 027--Auxiliary Coolin] 'ItNer Blowdown. PERMIT EFFTUDTP OIARACITRISTICS AT POINP OF DISOIARGE: Stmmary 1990/92 Existing Permit Proposed Permit DMR Reports Conditions Conditions Averace RTximum Averace Maximum Averace Maximtn Gramter Flow, gpd O* O - - No limit change
'Ibtal chrontium, mg/1** O O 0.2 0.2 Deleted, not used.
Total Zinc, mg/l** 0 0 1.0 1.0 Deleted, not used. Free Available 011orine (FAC), nJ/1 0 0 0.2 0.5 No lbtit Change pII, s. u. (Range) O to 0 6.0 to 9.0 No limit change
- Cooling tower was not used during this period.
** None of the 126 priority pollutants shall be used for cooling toWor maintenance.
a 9
Permit No. NH0020338 ATTAQR4DTP B DESCRIPTIOff OF DISCIAIEE: DISOIAICE 003--7herml Backflushing operation for biorouling control on intake coolirg water system. PERf41T EFFLUCfr CIARACTERISTICS AT POIlfr OF DISOIANE: Summat'/ 1990/92 Existing Pemit Proposcxi Pomit DMR Reports Conditions Conditions Averaqe 14aximum Averace f4aximum Averaqe 14aximum Parm?ter O 400,000 - Report 500,000 Flow, gallons per minuto (gpm) 0* Flow rate increased due to better flow rate estimation. 0 0 - 120** No limit etwge f Temperature, f4aximum, (Tm) , F O to 0 6.5 to 8.0*** No limit change pli, s.u. (Range) o Thermal Backflushing was no used during this period. oo The continuous backflushing flow at high temperature (120 *F maximum) shall not be longer than a duration of 2 i hours. The total backflushing cycle my not exceed 6 hours. 'Ihe thermal plume which arises from the backflushirn operation shall have minimal impingement upon the Inner arxi Outer Sunk Rocks in accordance with Paragraph
- 1. A.1.n. (1) of the proposed permit. The permittee shall use the operational seculures previously approvo.1 by the Regional Administrator and the Comntissioner which specifies the weather conditions, tidal conditions and any other l hydrodynamic factors that would minimize the impact of the bacPflushing thermal plume upon the Inner and Outer l Sunk Rocks.
o*o The pli of the discharge shall not be less than 6.5 standard units nor greater than 8.0 standard units or as naturally occurs in the receiving waters, NII DES Water Quality Stanitrds. The pli of,the marine waters at the Intake Transition Structure shall be considered as the receiving water pli for this pemit. l l 10
= e I l
_ . . . . _ . . ____ _ __ . _ _ _ _ . . m. _ . . _ _ . . . . . _ . . __ .m Permit No. NII00203 D3
- ATTAOIMDTP C i Listed belm are the chemicals utilized at Seabrook Station shwing:(1) the intermi stream discharge flow rate and concentration prior to release into the Circulating Water System, (2) The dilution of these chemicals by the Circulatirn Water System, (3) the Maximum Discharge 001 Concentration is the " Maximum Allowable dicmical Concentration" in the NPDE Pernit" for release through Discharge 001 and (4) the aquatic toxicity for the chemicals.
Typical RTximum Chemical Flow Rate Dilution Interm1 Dischage 001 Name gpm Ratio Disch. Conc. Conc. Aquatic 1bxicity mil mil ifydrazine . 200 841 225 0.5 Guppy 96hr-IC50 3.85 mg/l 85 1,980 3.0 0.5 Gold Book = 1 100 mg/l Ammonia (NII4 0ll) 96hr IC-5012 to 90 ng/l for Doron 150 1,122 2,500 5.0 (Max.) various marine organisms. Natural sea water has 3 to 4.6 mg/l background of boron. Lithium liydroxide 150 1,122 2.4 0.5 150 1,122 5 0.5 Salmon, Mortality 010 ng/l Ilydrogen Peroxide 50 Guppy 168hr Ir-50 49,300 m3/1 Ethylene Glycol 8.5 20,000 10 106 Guppy 48hr 1r-50 >10,000 mg/l 20,000 50 i Propylene Glycol 8.5 Trout 96hr IE-50 >770 mg/l 50 3,366 200 0.4 Bulab 9328 0.04 Daphnia 48hr IE-50 0.600 mg/l 50 3,366 20 Bulab 6002 Trout 96hr IC-50 0.37 ng/l Cat Floc TL 150 1,122 17 0.1 1,122 17 0.1 Trout 96hr 1r-50 0.37 ng/l Cat Floc L 150 150 1,122 17 0.1 Daphnia 48 hr 1r-50 0.89ng/l Nalcolyte 7134 Salmon 24hr IE-50 315 ng/l Sodium Nitrite 1 168,300 1,500 0.5 168,300 300 0.5 Trout 96hr IE-50 800 mg/l Sodium Molybdate 1 Daphnia 48hr II-50113 mg/l 13,500 12.9 62 5.0 Sodium Silicate ! Proposed dicmicals: - Bluegill 96hr IC-50 350 mg/l Morpho 11ne 200 841 5 0.5
- Silversides 96hr LC-50 400ng/l 200 841 5 0.5 Bluegill 96hr IE-50 329 mg/l Ethanolamine Trout 96hr II-50150 ng/l i Definitions
- 1. 01cmical Name is the chemical added for the purpose outlincd in the narrative portion of this Fact Sheet.
- 2. Flow Pate is the pumping rate of the internal stream containing the added chemical in gallons per minuto
- before dilution with Circulating Water System (Dischargo Ibnnel).
i 11 4 __ _ ._ . . _ _ _ _ __..m_ _____._._.m _. _ _ . . _ _ , . . . _ . ___.___...__...._._._.___._,_m
,,_ e m . . ..,_.wei<,_, ..m..% .m.. . , . , . , ,, ____,__m., _.
Permit No. NH0020338
- 3. Dilution ratio is the ratio of only one circulatim txmn in operation at 168,300 gallons per minute divided by the pumping rate of the internal stream containing the chemical.
- 4. Typical internal stream chemical concentration before release into the Ciru11ating Water System (Discharge
'Ibnnel) .
- 5. Maximum allovable chemical mncentration in the Circulating Water System Discharge (Discharge Tunnel) before release through Discharge 001. 'Ihis assumes only dilution without any chemical reaction with the compounds in the nnrine water or dilution from the diffuser nozzles.
- 6. Representative Apatic 'Ibxicity data as reported in literature for each chemical.
12 _ _-- - - _ . _ . _ . . =_ ._, _ _ __ ,_. _ _
; - e ne m r : - .s e re .a 5 ace:.; e e s o ,
l tw-m reas are scacec 'or eve tyce o e .12 c*' arac rMncM fom homec CV 9 No 155.aD'7S j - F Olmt.- - *"* ' * * uc *e va seon u twv a s. eno T E CT iove Ao E m Cv- it. EP A 1.D. NUMBE R ( _ .1 : ~ ^ - JENERAL INFORM ATION a . . . . . . < GENERAL I Tg' Consohdered Permrtr erogram F IN H D 0 S 1 2 5 7 4 t. 6l to . 4 4 R**d t*in " Gen **al Ps*tnarions " t>e fo's starttne a .;. . . > . . . l LABEi ATE M s ' G E M E R A 6. 4N1Y R ucT iC NS j A.ggyggp p e pmpnnW W has been WW, N
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et in the dos.gneted space. Rev ew the enforw I l 1 - h \ stion cerufully; if any of it is incorrect, cross I j
- d. (AC[lTY\ \ Ab \ E\
i
\ through it and enter the correct oste in the appropriate fill-n area below. Also, rf any of l
, \ Y \ \ \ \, the propriated data is absent (the eres to the j y' grACILITY MA8 ING ADDREES
, \ g Jeft of the Jabet space fires the information
\ N (x \ \ \
s- PLEASE PLACE LABEL IN THIS SPACE 86't should aposers, pisees prov.de :: in tne !
- x g N' proper fill-4n erurs/ beiow. if the inter is s compim and correct, you need not comosete Ny N
{ stems i, in. v. and vi tueset vi.a wnch snust be Cernpleted reperdiess/. ComoleTo all FACILITY items if no label has been prtmded. Refer to
- 8.OC ATIO N the inrtructions for detaaed item descrip-4 i tions and for the legal authorizations under
\
^
\ .\ which this data is collected.
INSTRUCTIONS: Complete A through J to determine whether you need to submit any permit oppfcation fonns to the EFA. If you answer "yes"to any gustrione, you mest submit this form and the supplemoctal form listed in the parenthesis following the question. Mark "X"in the box in the third column i if the supplemental form is etteched. If you entwer "rto" to each cuartion, you need not submit any of these forms. You may entwer no"if your activity j is exctuded from permit requirement::see Section C of the instructions. See also, Section D of the instructions for definitions of bold-faced terms. I w a n x x- u n j sPECar C QUEsTtoMS , gpgggggg gyggggggg ,,, . , , .
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! ; A. Is. trus facitrey a putsefy owned trastment wwks. B. Does or wdl the facility (a/ther esisting or proposed / wn.ch resutts m a dacharge to waters of the U.S.? *X include a canoenuated ananel fooding operation or y
}' (FORM 2A) . equetic animmi productson facility which results in a "
j ,, , , ,, discharge to waters of the U.SJ (FORM 2B) , , , , , , ,, C. is the a f acahir wnicn currently resaits en oischarges l D. is thse a propoemd facurty torner charp enose ossenbec - r p to waters of the U.S. other than those desenbad -trr X ll i X in A or 8 abooel which wil lresult in a dimaharys to lXI A or B ebove? W08tu 2C) n + n I .. weters of the Ul? (FORM 2D) u 4 ,. .. E. Does or wdl this facihty treat, store, or dispose of F. Do you or will you intact at this facihtV industrial or municipal effluent below the lowermost stratum con-hazarttous wastas? (FORM 31 X taining, withm one guerter mile of the well boro, X j ,, ; , , ,, underground soureus of drinking water? (FORM 4) ,, , , , , ,, F.,. Do you or wi.4,ou ryect et thes f aciiity any proouced water or other f 6.cs wnich are brought to the surf ace I in connection with conventional o.1 or natural gas pro- y coal processes mJeh as msning of suffur try the Frasch
- fuction, insect fluids used for enhanced recovery of a procm, dutson hng d minwsis, in artu enbuk .X o fuel, w reewy of geothermal onwgy?
oil or natural gas, or inject fluies for storage of Is:tuad hydroorbons? 4CRM a) 3 t ..i fph 3. n 3
- 4. Is this f acurry a p-oposed rtsteonary source wnech a J. la this facuity a proposed 6tstsonary soitrae wnsch a
]
orie of the 28 andustrial categt ses listed in the m- NOT one of the 28 industrial categones twted in the
' structions and wench wdl pctent.elly emrt 100 tore instructions and wh.ch will potentiaify emit 250 tons
'z g per veer of any a.r pollutant reguteted unoer the per year of any air pollutent regulated under the Cloen
- Clean Air Act and may effect or be. located in an Air Act and mey effect or be located in an attainment etteerrnent arse? UCRM 51 i .. .. eres? (FORM 5) .. .. . .. 1 1, . . . . .
m ". .S.".E A 3 E O O .' 11 STATION l A. N a nd E & TITI.E (last. fbet. A fatar) l a. PHON E (arre rose e mod . . - . . i i . . . . . . , 4 T?ESCHEL. s. JAME5 - , - R E G l' L A T 0 R Y MGRl603 .. 4 74 9521 4 f; .- A. sT n E ET oR r.o. sox
. . i i T P0 ' box 300 j . .. ..
1 B. CITY oR TowM C.S T ATE D. ZlP COD E s . 4 . 6 . 1 i 4 4 , i e i e i 4 i . l; M'SEABR00K N Tr,H 03874
}
4 A. STREET, ROUTE 9sO o R oTM E R SPECIFIC BDE NTIFtE R 3 4 . j 5!U S. . R O . L' . T E _ . l.
..i.. .
l o. Cov=Tv naut , . i . . . . . . . . .. . . ..... I , RO.CKINGHAM g C. CITY on Town IoSTATE E. Zir CooE l FCOu d TVccRE j ye > > > i 615.E.A.B.R.0.0 K. NH 03874 j EPA Form 361o 146 80) CONTINUE ON REVERSE l 1.___.._____.___.._______ . _ _- - - - - -_ -_ --
- AntmCCODES is-dift. m o W sib - A. rinst l s. se cono
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s lupece>i ' 1 *, 91IJ.ispeceyi i Electrir Power Generation 7
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' } o.FounTH s, . . * * ' 74 bespecays l <specityi ) .. .. ., A.nA E
, , , , , . s. is trie n.m. t.et.a , - . i . . . . . . . . . . . . . . . 4 . 1 i i i . . 4 i . . . . . i stem vm-A si o ti ownerr j B i SEABR00K STATION MANAGING AGENT j .. i ..- -
O ** YES G NC j c. ET ATUS o r ore = AT on tenter the approprnate letter snto the arLrwer bos;If "Osher", specsfy.) o, enoux fareacose a nal ! F = FEDERAL M = PUSUC (other rnan federal or s:ste/ (specify : ' . 6 . e ] S = STATE O
- OTHER (specify; P A P = PRIVATE 603 4 74 9521 T .. .. .. .. ..
- s. sT nE ET o n P.o. sox j
. . i . . . . . . . i . 4 4 4 4 4 6 . i e . i a a a i e i
?O EOK 300
- r. c Tv o n Town IG.s? ATE n.zPcoon
. . . . s .
IX. INDIAN LAND 4 . , . . . . i i . i . . . ' ' is me facitety located on Indian lancs7 B SEASROOx NH 0 3 8 7 '. O YES
.. : ,, - S2 U NO a A. nrots (Di.scharges to Sur%ce Water) o. vso (Air Emisstons from Proposed Sourcest
. . . . . i . 4 . . , i 4 .
. i i i . . . .
i F: Na NH002033S 9 P
- 1. ,. . .. .. .. .. .. ..
) - E. U KC (Underground 2n.nection of flusds) E. OTn E= (spectfy} ~ c , . . 3 i . i i a i 6 . i e v 4 4 6 i . . 4 i i e . 7,
- 9 U '9 u
g~, C. RCa A (HasArdous Wastes) l L oT n E = (speCxfyj v
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! t s i 4 . i 6 c , a e 4 4 . . 4 1 4 , B R p,g l9
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Attach to this app 6 cation a topographic map of the area extending to at least one mile beyond property boundaries.The map must s the outline of the facility, the location of each of its existing ared proposed intake and discharge structures. each of its hazardous waste treatment, storage, or disposal facilities. and each well where it injects fluids underground. Include aJI springs, rivers and other surface water bodies in the map area. See instructions for precise requirements. Inves un c c.ed electric utility nuclear generating station. l I certify under pensity of law that I have personally examined and en funillar with the informetron asbrnittedin this app
*attachmmtt and that, based on my inquiry of thoer persont ommedletafy raponsible for obeaking the ksformation contain ; false nppikation, information, I believe includingthat the information the possibility of fine and is true, accurate and complete. I un esere that there are significantpe imprisonment.
A. N AM E 4 Q F F IC s A 6 T eT LE ff}pe or prIMtj
~ S.56GNATunE C, D A T E $.G N E D T.C. Feigenbaum, President & CEO f
ff 9{ l 2 Y c' - 15 EPA Form 35101 (6-803 REVERSE
- u s coveni.urwT pete.c orrect x . c: )
a Supplemental Information Seabrook Station Managing Agent EPA I.D. Number NHD081257446 Form 1. VIII.B. Ownership Public Service Company of New Hampshire ! Canal Electric Company The Connecticut Light and Power Company EUA Power Corporation . Hudson Light and Power Department ; Massachusetts Municipal Wholesale Electric Company ' Montaup Electric Company New England Power Company New Hampshire Electric Cooperative, Inc. Taunton Municipal Lighting Plant The United Illuminating Company Vermont Electric Generation and Transmission Cooperative ] The above stated twe vc Joint Owners are parties to an . Agreement for Joint Ownership, 8 Construction and Operation of New Hampshire Nuclear Units, dated May 1,1973, as amended (the " Joint Ownership Agreement") which governs the Seabrook project. , Pursuant to paragraph 36 of the Joint Ownership Agreement, the Joint Owners have appointed a managing agent to manage, operate and maintain the.Seabrook Station. The current roanaging agent is New Hacipshire Yankee Division of Public Service Company of ; New Hampshire. In connection with the reorganization plan approved by the Bankruptcy i Court in the proceeding relating to Public Service Company of New Hampshire, it is anticipated that the North Atlantic Energy Services Corporation (NAESCO) will become i the new managing agent and that North Atlantic Energy Corporation (NAEC) will acquire j Public Service Company of New Hampshire's ownership share of Seabrook Station. j Licensees will inform the EPA when these changes occur. j l l
. - - _ =. . _ . .
'A "
n., e r r . # -.~ . m a n,s v , NHD081257446 l' m'r:,,,,",r.s .: ;. y
-^
- FORM v5 E N v'a cNwt N'a *aOT' ON aeENcv l g% APPLICATION FOR PERMIT T'O DISC. .4GE WASTEWATE R 2gb g EXISTING MANUFACTURING, COMMERCIAL, MINING AND SILVICULTUR AL OPER ATIONS !
NPOES Consolidated Permits Program For each 06t f a ' 51 me r Ae and .cq toce of !$ orat,on to the aearest 15 seconcs and tae name of the rece,ving water A sT Ag L j B w e T
- T .J D E j C LO N G tT U D E
.nr ... .. u , , .~ , ..: '
001 42 53 43 70 47 27 l Atlantic Ocecn 002 42 54 06 70 51 11 Browns River 003 42 54 17 70 47 12 Atlantic Ocean
.-_. l lI.FLo.'5. k,L2CE5 0F PCLLUT!ON. AND 'RE ATMENT TECHNOLOGtES A .1" : -
.a ! s w ', N ,re *.A %r "e 'a; tv . lac. ate sources af m- e un , Ocerat,oni .0" M
(. q an r. sy d"3 ,[,- r d ' e c ' e " * / 13 dtM eC tO sy'e5D7 d I3 the m0re Ce*3 ad de5U Pt'Cr's +n item 8, Construct a water Datance on '.he ae Of aw rg Ov 3PO s .J 3. a 1,r flows tetnean .Maue5. OperatsCns, treatrDent ufhts, and 06t'ad5. If a water balance cannot be deterrmned le g, for carra,n m.nmrip activet.es- 70uce a DtCtCtal JeScr Ot On of IPe nature and amc.,nt of any Sources Of Water and any Collection or treatment measures. l 6 F 3r eacn %!*ad. OrCv'Ce a cegr+ption of til A's operat.ons contributing wastewater to the eftruent. including process wastewater, %snaarv a as' awe'e-000bng Aater. and itOrrn Wa*er runctf; ID The average ' tow co tributed by each operation, and O) The treatment receivec by tre wasteware M me 09 a00 f.On3l $heet5 #f nece55ary
, guy. 2 OPE R A TIONIS 6 CON T wimV TIN G F Lon 3 TREATMENT a OPE R a TION .sf , y a OESC R tPTION Ta g hh 001 Condenser. Auxiliary Cooling 714 MGD Continuous Chlorination i 2F ! 4B
- Demineralizer Wastes 0.36 MCD Neutralization ! 2K !
1 l (022) Secondary Plant Leakage 0.03 MGD 011 Separation, Filtration
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\ s I (023) Secondary Plant Leakage 0.04 MGD 011 Separation, Filtration 1H IN_ (025) Distillation, Neutral- 0.61 MGD Evaporation. Filtration ID IF iration Wastes; Steam Neutralization, Distillation 10 2J
' Generator Blowdown Demineralization 4B 1
l(027) Cooling Tower Blowdown l' 0.50 MGD Low-level Chlorination, Scale! 2F ri j l Control ! l 002 Stor- Runoff
- 6.1 MGD Settlement, Neutralization l IU 2K
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(021) Treated Sanitary Waste 0.035 MGD Primary, Secondary Aeration f1G,li,IM,10 { Disinfection l 2F,3A ' iB,4A I
) i l(024) Secondary Plant Leakage
- 0.01 MGD 011 Separation, Filtration I lH IN (026) Chemical Cleaning Waste 1.0 MGD Settlement. Neutralization 10 l 2K 4A l .* l 003 !ack-flush 3 Operation 677 MGD Heat Treatment E< aB l
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- To be transferrred to Outfall No. 001 following l Flow Path Modification _ __
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? L F A t D N UM 9 t R stops (to"l far* ApprQved i Ire'nt j of E'um j j ~l ' 4 CONTsNUED s ROM PACE 2 'D081257*' ' 6 " 8 '" #rapores Accrover * "r2 31 85 l ) V. INTAKE AND EFFLUENT CHAftACTEft STICS ' l
- A, B, & C: %e instructions before proceeding - Complete one set of tabies for each outfall - Annotate the outfall number in tha space provided, j NOTE: Tantes V-A, V-8, and V4 ore included on separate sheets numbered V 1 through V-9.
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1 D. Use the space below to hst any of the pollutants lasted in TaDie 2c 3 of the instructions, evhicn you know or have reason to beheve 's discharged or Tav ;c l l discharged from any outta61. For every pollutant you tst, briefiv describe the reasons you beneve it to be cresent and report any anaiyt.ca: cara n ... i possess.on. I e FoLLuvaN1 l 2 sounct f moLLvTANT 2 sounct l _ l 1 See supple = ental Informat ion Sheet ; i l l I i 5 l I Y ( i 1 4 1 , l ! l t l VI, POTENTI AL DISCHARGES NOT COVE RED BY AN ALY S15M - j, l ts any poliutant t.sied in item V C a sube'ance of a Compor:ent of a swDstance wnich you currently use or manufacture SS an intermediate Jr bra F .:C.. ' ' DYproduCl? l ' s Ls ain s .u - n::u u.,,, .. . , , XNo o e> u. m vs a, I 1 i 4 i k e 1 I i j s I ) i 4 l b 1 a 4 k , I i , t i i I i (
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{ i i t i l EPA Form 3510-2C iRev 2 85;
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Do you *. ave any knowleoge or reason to beheb
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at any biotogical test for acute or chronic forec:tv n as weert mace on any ot vowr c scharges or y a I
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A *w a v E l B ADoREsb " " ! cer fr -e ef e & e . . i - l See Supplemental Information Sheet i i l l 4 i ! Icertify under pervatty of law that th*s document andallattachinents were prepared under my direction or supervision en accordance with a svstem Jes gnec to } , assure that qualifiecpersonnelpropertygather andevaluate the informatson submitted Basedon my onquoryof theperson orpersons w those persons directly responsible for gathering the information. the intormotion submittedis, to the best of my knowledge , , andbelief true
. ne c:.~7"'e I am aware that there are significant penalties for submitting false information, mctuding the possabolsty of fine . .astand crs ompris a N a v E e o f F i c. i ns T ITLE m-B PMCN E No u .
I j T.C. Feigenbaum, President & CEO ! e swa.g (603) 474-9521
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o om rE sio~c o l { ,ggyj/: Jm ; 4 ' ' Tl } EPA Form 3510 2C 1Rev -85) PA GE J CF J I i 4
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SUPPLEMENTAL INFORMATION Seabrook Station, New Hampshire Yankee ! EPA I.D. Number NHD081257446 i Form 2C. V.D. Additional Chemicals Believed Present Hydrazine , Morpholine Ammonium hydroxide Lithium hydroxide Hydrogen peroxide Ethylene glycol Propylene gylcol Buckman's Bulab 6002 , Buckman's Bulab 9328 1 I i I l l l L
SUI'PLEMENTAL INFORMATION Seabrook Station, New llampshire Yankee EPA I,D. Number NilD081257446 Form 2C. VIII Contract Analysis Information Normandeau Associates, Inc. 25 Nashua Road (603) 472-5191 All except pit, temp, Bedford, Nil 03102 Flow, alpha / beta,
& acrolein, acrylonitrile P.O. Box 1393 (803) 652-2206 for outfalls 001, 002 Aiken, SC 29802 021, 022, 023, 024, 025B 027.
Clean liarbors Analytical 325 Wood Road (617) 849-6070 Alpha / beta for outfalls Services, Inc. Braintree, MA 02184 021, 025B Industrial and Environmental P.O. Box 12846 (919) 677-0427 Acrolein, acrylonitrile Analysts, Inc. Research Triangle Park, for outfalls 001, 002 North Carolina 27003 021, 022, 023, 024, 025B 027. Science Applications 3 Choke Cherry Road (301) 977-4480 All except pli, temp, flo" International Corp. Rockville, MD 20850 for outfalls 025A, 025C and 025D. Phenols 025B.
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Supplemental Information l Form 2C, II.A. Flows, Sources of Pollution, and Treatment Technologies The following text should be read in conjunction with Figures 1 (Facility Location), Figures 2A and 2B (Station Water Use), and Figure 3 (Station Drainage Areas). . Seabrook Station utilizes water from two major sources, the Atlantic Ocean and municipal wells from the Town of Seabrook. In addition, private wells developed onsite and north of the site along Brimmer Lane could be utilized to supply water should s additional capacity be required. These flows and water uses are described in greater detail below. This water is used by Seabrook Station for potable water and in the generation of electricity. The water is currently discharged to the environment via three outfalls, two to the Atlantic Ocean (Outfalls 001 and 003) and one to the Browns River (Outfall 002). OCEAN WATER FLOWS OUTFALL 001 Ocean water is used for cooling equipment (service water), and condensing steam (circulating water). Water is taken into the Circulating Water System through three intake structures located approximately 7,000 feet offshore (Figure 1). From the intakes, cooling water flows through a 19-foot diameter tunnel to the on-site pump house. Approximately 714 mgd will be drawn through the system and utilized for both condenser cooling (677 ' mgd) and service water cooling (37 mgd). Water from this system will be discharged through the onsite Discharge Transition Structure (DTS), traveling through a 19-foot discharge tunnel to offshore multiport diffusers. All monitoring for this discharge takes place at the DTS. Service water for auxiliary cooling is pumped to heat exchangers within the Station for component and Emergency Diesel Generator cooling. The service water mixes with the condenser cooling water prior to entering the discharge tunnel. Currently, the Circulating Water System becomes the transport for treated waste drains from the primary plant, and treated floor drainage from the secondary plant. Flows from Oil / Water Separator vaults l No. 1 and 2 (Outfalls 022 and 023), discharges from the Steam Generator System (Outfall 025), blowdown from the Auxiliary i Cooling Tower (Outfall 027), and Neutralization tank discharges l following water treatment, are discharged through Outfa ll 001. i Planned modifications to Station flow paths will place Sewage Treatment Plant effluent (Outfall 021), Oil / Water Sepa'tator vault No. 3 (Outfall 024), and all site runoff collected by the i storm water drainage system and discharged through the Settling i 1 t
1 Basin (002), through Outfall 001. Biofouling control is achieved through the use of continuous, low-level chlorination of the cooling water stream ; within both the Circulating Water and the Service Water Systems. l Chlorine (sodium hypochlorite) is injected at the offshore intake structures and at additional locations within the Station as needed. A chlorine minimization program has been implemented to determine the minimum level of chlorine discharge into the ; receiving water, while maintaining suitable biofouling control of the intake cooling water system and condenser efficiency. 1 OUTFALL 003 ' In addition to chlorination, thermal backflushing of the ' intake tunnel may be employed to remove biofouling organisms i attached to system components. This method will involve the reversal of the cooling water flow such that the intakes serve as the discharge (Outfall 003) and the discharge ports function as ! the intake (see Figure 1). Temperatures within the intake tunnel 1 will be elevated to a maximum of 120 F for a maximum of two l l hours. The entire flow reversal and heat treatment cycle will ! occur over a six-hour period at a maximum flow rate of 471,000 l gallons per minute. There will be no chlorination of the : condenser cooling water during the thermal backflushing treatment. s l FRESH WATER FLOWS > Fresh water is utilized to supply the needs of the Station i potable water system, makeup water to the Auxiliary Cooling Towers, water needs to the Demineralization Water Makeup System, and makeup to the Fire Protection System. Refer to Figures 2A , and 2B. , I Fresh water utilized by the Station is derived from the Town i of Seabrook municipal well system. Currently, an average of ' 156,000 gallons per day are obtained from the Town of Seabrook : with a maximum of 320,000 gpd possible. In addition, provisions ' have been made to obtain water as needed for system makeup from wells owned by Public Service Company of New Hampshire. These ' wells are located on site and along Brimmer Lane in the Town of Hampton Falls, however, are not currently connected to the i potable water system and are unavailable for use. The wells will l be activated as necessary should the demand for fresh water ! exceed the maximum allowed use from the municipal source. A ' maximum yield of approximately 500,000 gpd can be obtained from ! both the onsite wells and those located on Brimmer Lane. All flows will vary appreciably during station operation. 2 l
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I Demineralized Water During Station operation, demineralized water is used to replace leakage losses from both the primary and secondary water cycles. There are four major effluent streams from the l l l Demineralized Water Makeup System: demineralized regeneration effluent, Steam Generator Blowdown and related effluents, primary plant leakage, and secondary plant leakage. The makeup flow to the primary plant is estimated at 6,000 gpd, but may vary to as much as 20,000 gpd during Station operation. Water leaving the system is collected within the , Waste Test Tank and may be processed by a combination of filtration, evaporation, and demineralization. Treated water is recycled whenever possible. Treated liquid waste effluent will be discharged following monitoring, to the condenser cooling water effluent flow just prior to discharge through Outfall 001. Regenerate chemicals for the water treatment plant demineralizers are neutralized before discharge to the Circulating Water System (Outfall 001). A 30,000 gallon neutralization tank has been installed to accommodate this system which is discharged via batch mode to the Circulating Water System. This neutralization tank may be discharged numerous times on a single day depending upon Station requirements. OUTFALLS 022.023.024 Oil I Water Separator Vaults The make up to the secondary (power generation) system constitutes the greatest need for demineralized water during Station operation. An estimated 68,000 gallons per day (maximum of 367,000 gpd) is needed. The portion of the flow that leaks or drains from the system is collected in floor drains and passed through oil / water separators prior to discharge. Each separator ; has been designed to discharge a maximum of 122,400 gpd. The ; average flows presented in Figure 2 represent those seen from these systems since the NPDES permit was issued in 1985. Each l i separator is designed to separate oil from drainage water. i The oil / water separators are arranged to process drainage piped from the following buildings and plant areas:
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o Oil / Water Separator #1 (Outfall 022)- Emergency Feedwater Pump House drainage, the Turbine Building sump, the Lube Oil Building su=p, and the Lube Oil Storage Room sump. o Oil / Water Separator #2 (Outfall 023)- Diesel Generator Building sumps and the Auxiliary Boiler Room drainage. 3
1 4 o Oil / Water Separator #3 (Outfall 024)- Auxiliary Boiler g Fuel Oil Storage Tank area, the Fire Pump House Day Tank area, and the Fire Pump House drainage trench. i' ( The processed effluent is currently discharged to the - Atlantic Ocean via the Circulating Water System Outfall 001 ; (vaults #1 and #2), and to the Browns River via Outfall 002 ; (vault #3). Planned modifications to the Station flow paths will ! , divert all oil / water separator vault discharges to the Atlantic l l Ocean through Outfall 001. l I OUTFALL 025 i i Steam Generator Blowdown l The Steam Generator Blowdown system is designed to remove I dissolved impurities and suspended solids from the secondary side ; of the steam generators. This is accomplished by continuous i blowdown of liquid from each of the four Steam Generators. The ! blowdown flow is processed to recover and recycle as much of this water as possible. Processing may involve evaporation, filtration and demineralization. The non-recycled effluent ! stream is then discharged to the Circulating Water System flow i prior to discharge. ' ! Outfall 025 receives purified liquid waste and i neutralization effluent from the Steam Generator Blowdown f l recovery regeneration sump. Also monitored and reported through ! this outfall is the blowdown directly from the Steam Generators, ! Steam Generator blowdown distillate, effluent from-the Recovery Test Tank, and discharges from the Waste Test Tank. Each is l discharged via batch release to the Circulating Water System ! (Outfall 001). As extensive operational data is not yet available for these systems to provide an accurate average value, the following maximum discharge capacities are provided Steam Generator Blowdown; 384,000 gpd I Steam Generator Blowdown Distillate; 50,000 gpd i Steam Generator Blowdown Recovery Sump; 28,000 gpd l Waste or Recovery Test Tank; 20,000 gpd l i OUTFALL 026 Chemical Cleanino Chemical cleaning wastes are processed onsite to improve the i quality of discharge water prior to their release to the environment. Such wastes may include the nitric acid chemical cleaning of the sodium hypochlorite generation cells. A maximum of 1 million gallons per day may be discharged from this system depending upon Station needs. In addition to chemical cleaning wastes, the basins may be utilized for the neutralization of 4 l l
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, Settling Basin water prior to discharge to the environment ,
through Outfall 002. All other discharges will be made via batch ; mode through the Settling Basin, Outfall 002, or through the proposed Outfall 028 to Outfall 001. Planned modifications to , the Station flow paths will divert all storm water to the Circulating Water System through outfall 001. In addition, with i the decommissioning of the onsite Settling Basin, neutralization through the chemical cleaning basins will no longer be required. As a result, the chemical cleaning basins will be decommissioned. Future handling of chemical cleaning wastes will be done on a case-by-case basis, with neutralization being performed either within systems or tanks and discharged through outfall 001. OUTFALL 027 Auxiliary Coolina Tower A mechanical draft cooling tower, installed as emergency backup to the Service Water System, has the capacity of removing 217-million BTU per hour. The tower is filled with approximately 4 million gallons of fresh water.
- The cooling tower will also be utilized during thermal backflushing of the Circulating Water System.. The flows shown are those related to the backflushing process. The atmospheric discharge of 360,000 gpd has been calculated for a 10-hour use period. Makeup flow would refill the tower over an 18-day period. Salt water may be utilized as makeup to the tower should a sufficient freshwater supply not be available. In such a I case, blowdown would be required to eliminate the higher
! concentration of solids within the tower. Blowdown of the cooling l tower is expected to be performed on a once-per-month basis, discharging an average of 0.5 million gallons over a one-hour l ' l period. Cooling tower blowdown, should it occur, will be made to the Circulating Water System (Outfall 001). , l OUTFALL 011 l Potable and Sanitary Wastes l Sanitary wastes are collected and processed at an onsite treatment facility. This facility employs primary treatment through the use of an activated sludge treatment, secondary I treatment through the use of aerated lagoons, tertiary treatment through filtration, and subsequent chlorination of the final ! effluent. An average of 35,000 gpd are processed prior to ' discharge through the onsite Settling Basin to the Browns River i at Outfall 002. Currently, the facility is operated five days per week (Monday - Friday) due to limited inflow over the weekend days. At times of lower flows or during times of system maintenance, the facility may be operated for lesser periods. This will not jeopardize operation or discharge quality due to reserve volume available within the lagoons. i I l 5
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I 1 l l Planned modification to the Station flow paths will place all discharges from the Sewage Treatment Plant into_the Circulating Water System for discharge through Outfall 001 to the ; Atlantic Ocean. As a result of the extensive volume within the ! Circulating Water System and an adherence to the discharge limits I specified at the Sewage Treatment Plant outfall, this change will i have no impact on the receiving waters, the Atlantic Ocean. l l , t OUTFALL 002 i Settlina Basin Outfall 002, the Settling Basin, has a capacity of approximately 2 million gallons. The principal influent is site _!' l storm water. Other influent include the discharge from Outfalls l 021, 024, and 026. Water periodically flushed from portions of : the Fire Protection System to the stormwater collection system t may also be present. The combined effluent is controlled through ! an adjustable weir and is discharged to the Browns River. l At times-when the pH of the basin is outside of permitted limits, seawater may be introduced or water may be transferred to the Chemical Cleaning Basins for neutralization prior to. discharge to the Browns River. ! Planned modifications to Station flow paths will place all discharges from the Settling Basin into the Circulating Water : System for discharge through outfall 001 to the Atlantic Ocean. ' As a result of the extensive volume within the circulating Water l System, this change will have no impact on the receiving waters, t the Atlantic Ocean. Stormwater Runoff Stormwater runoff as a result of rainfall onsite is l controlled by catch basins, which currently discharge to the Settling Basin, catch basins located at the General Office Building which discharge to the adjoining environment, or sheet flow which is allowed to percolate into the ground. The , estimated stormwater flow to the Settling Basin during the l 2-year, 24-hour rainfall event is 6.1 MGD. It is currently planned that stormwater collected and discharged through the Settling Basin, be routed and discharged to the Circulating Water System (Outfall 001). The volume consists of drainage from roof drains and those areas surrounding l Station buildings, the' collection of drainage along the North Access Road,'and various construction laydown areas. l 6 l l 1 i
The function of the Settling Basin is the retention of influent flow prior to discharge. If oil were introduced ! into the Settling Basin, discharges from the basin could be terminated and the oil retained by floating booms until removed. The flow path modification will eliminate the Settling Basin and its retention capability, however, the potential for the introduction of significant quantities of oil into the storm drainage system is precluded through an j established Spill Prevention Control and Countermeasure Plan l per 40 CFR 112. Outdoor oil storage tanks and transformers
- are either within bermed areas designed to contain maximum l postulated leakage or controlled to prevent discharge.
Precipitation into the bermed collection areas is monitored for oil contamination prior to processing by oil / water separation equipment and discharge. Indoor oil storage tank i leakage is contained within the structure itself or is diverted to oil / water separation equipment. Underground Storage Tanks are subjected to ongoing monitoring of the tank volumes to ensure that tank integrity is maintained. The only credible source of oil introduction into the storm drainage system is the very small amount which may be deposited on paved areas by vehicles or other equipment and washed into the storm drainage system. Station drainage areas are outlined in Figure 3. The area identified by the letter "A" currently flows to the Settling Basin, however, will be redirected to the Circulating Water System and discharge to the Atlantic Ocean l through outfall 001 in the future. The area identified by the letter "B" flows to the environment adjacent to the General Office Building through catch basins. All other drainage is considered to be sheet flow to the adjacent environment. t l l l i 1 7 i l
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April 11,1991 t f OUTFALL 001 l CIRCULATING WATER SYSTEM r i. 6 i
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_-._m . , -.. . . . . - . _ . . tra e o NuMat n nee &v frone its-ns' i ~nt Vorriii Pt t ASE PillN I Olt T YPI' IN litt; UNSilA(JE D AHf AS ONt Y. )ou may segus some or all of this mf t>tmation on Senatate sheets (use the same format) inste.nl of tinopletmi; these gwp.s. NilD081.,,5 74/ fi i p eneg,m,, % Appre,,e fois, m,g ,t I Aivreewat eeveres 7131 gr,
*IIINSTHtritONS V. IN T AKE AND Li F LUEN T CHAll ACillllSIlCS h untmtmd frewo p.tvc 3 of I ovn 2 L ()() l l'Alli A - You nuest seinvult? the etwults til at le ist mic anulym los evee y inellistaint ist thiss latile. (:tiviigileter inste f.ittle fin e aili utet f a'i de e inistr ut i or s tint .nlilei airial <!t tails.
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6 pH 7*g /pk l ST ANDAHD UNITS N . PAFIT B . Mark "X"in column 2-s for each pottutant you know or have reason to teheve es present. Mark "X" an column 2 b,for each pollutant you beheve to be absent If you mark column 2a for any pollutant which es tem <ted eether derectly.or enderectly but enpressly. sn an effluent lemstations guedelitie. you musterovide the results of at least one analysis for that pollutant For othor pollutants for which you mark column 2e, you must provide quantstative data or en esplanation of their presence en your dischstge. Complete one table for each outf all See the mstr uctions f or additionaldete os and requiremants i g , potty y. 2 Mann *n 3. E r r L'J E' N T 4 UNtTS 5. I N T A K C (. pro mah D
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