ML061380114

Addenda Songs, Units 2 & 3 - NPDES Permits

ML061380114
Person / Time
Site:	San Onofre
Issue date:	05/16/2006
From:	Scherer A Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC:13-0088.01
Download: ML061380114 (13)

Text

SOUTHERN CALIFORNIA A. Edward Scherer EDISONa Manager of Nuclear Regulatory Affairs An EDISON INTERNATIONALS Company May 16, 2006 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.

Subject:

Docket Nos. 50-361 and 50-362 Addenda SONGS Units 2 and 3 NPDES Permits San Onofre Nuclear Generating Station Units 2 and 3

Reference:

Letter from John H. Robertus, San Diego Regional Water Quality Control Board to H. W. Newton, SCE, regarding Addendum No. 1 for NPDES Permit Nos. CA0108073 and CA0108181 for San Onofre Units 2 and 3, dated April 21, 2006.

Dear Sir or Madam:

In accordance with Appendix B of the Units 2 and 3 Facility Operating Licenses, Section 3.2, Environmental Protection Plan, enclosed are copies of the approved National Pollutant Discharge Elimination System (NPDES), Addendum No. 1to Permits CA01 08073, Order R9-2005-0005 and CA01 08181, Order R9-2005-0006 for San Onofre Nuclear Generating Station (SONGS) Units 2 and 3, respectively.

Appendix B requires changes or additions to the NPDES Permit shall be reported to the NRC within 30 days following the date the change is approved.

If you have any questions, please contact Mr. Clay E.Williams at (949) 368-6707.

Sincerely, Enclosure cc: B. S. Mallett, NRC Regional Administrator, Region IV N. K. Kalyanam, NRC Project Manager, San Onofre Units 2, and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3 P.O. Box 128 San Clemente, CA 92672 949-368-7501 cioof Fax 949-368-7575

California Regional Water Quality Control Board San Diego Region Over 50 Years Serving San Diego, Orange, and Riverside Counties Dan Skope Arnold Schwarzenegger Acting SecreltactI Rcilpient of the 2004 Environmental Award for Outstanding Aldievement from USEPA Governor 9174 Sky Park Court, Suite 100, San Diego, California 92123-4353 (855) 467-2952

• Fax (858) 571-6972 htp:// www.waterboards.ma.gov/sandiego April 21, 2006 CERTIFIED MAIL-RETURN RECEIPT REQUESTED Mr. H. W. Newton 7002 2410 0004 0597 4535 Manager, Site Support Services In Reply Refer to: NCR:1 3-0088.01 :ccheng Southern California Edison P.O. Box 128, San Clemente, CA 92674-0128

SUBJECT:

ADDENDUM NO. 1 TO ORDER NO. R9-2005-0005, NPDES PERMIT NO. CA0108073, WASTE DISCHARGE REQUIREMENTS FOR SOUTHERN CALIFORNIA EDISON (SCE), SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) UNIT 2, SAN CLEMENTE, SAN DIEGO COUNTY, AND ADDENDUM NO. 1 TO ORDER NO. R9-2005-0006, NPDES PERMIT NO. CAD108181, WASTE DISCHARGE REQUIREMENTS FOR SOUTHERN CALIFORNIA EDISON (SCE), SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) UNIT 3, SAN CLEMENTE, SAN DIEGO COUNTY Enclosed are copies of the subject addenda to Orders Nos. R9-2005-D005 and R9-2005-0006 adopted by the California Regional Water Quality Control Board, San Diego Region (Regional Board) at their April 12, 2006 meeting. The adopted addenda changed the maximum allowable effluent flow rate for two low volume in-plant waste streams and the corresponding mass emission rate limitations from SONGS Unit 1 to Units 2 and 3 discharges to the Pacific Ocean. The flow rate limitation for the Unit I Yard Drains waste stream discharge is increased from 0.360 MGD to 8.64 MGD. The fl6w rate limitation for the Unit 1 dawatering waste stream discharge is increased from 0.864 MGD to 3.75 MGD.

Copies of the enclosed document can also be obtained from our website as follows:

http:/Jwww.waterboards.ca.Pov/sandiepo.

The heading portion of this letter includes a Regional Board code number noted after "In reply refer to:" Inorder to assist us in the processing of your correspondence please CaliforniaEnvironmentalProtectionAgency G Recycled Paper

Mr. Newton April 21, 2006 Addenda No. 1 Order Nos. R9-2005-0005 & R9-2005-0006 SONGS include this code number in the heading or subject line portion of all correspondence and reports to the Regional Board pertaining to this matter.

Ifyou have any questions regarding the above, please contact Mr. Charles Cheng at (858) 627-3930, or via email at cchenp waterboards ca.iov.

AJOHN H. ROBERTUS Executive Officer San Diego Regional Water Quality Control Board JHR~mpm:rm:cqc

Enclosures:

Addenda No. 1 to Orders No. R9-2005-0005 & No. R9-2005-0006 cc W/end: State Water Resources Control Board Division of Water Quality P.O. Box 944213 Sacramento, CA 94244-2130 Attn: James Maughan U.S. Environmental Protection Agency Region IX WTR #5 75 Hawthorne Street San Francisco, CA 94105 Attn: Douglas Eberhardt Transmhta; letter for adopted addenda No.1 .doc California Environmental Protection Agency a RerycledPaper

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD SAN DIEGO REGION ADDENDUM NO. 1 TO ORDER NO. R9-2005-0005 NPDES PERMIT NO. CA0108073 WASTE DISCHARGE REQUIREMENTS FOR SOUTHERN CALIFORNIA EDISON DISCHARGE TO THE PACIFIC OCEAN THROUGH OUTFALL 002 FROM SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 2 SAN DIEGO COUNTY The California Regional Water Quality Control Board, San Diego Region (hereinafter Regional Water Board), finds that:

1. On May 11, 2005, this Regional Water Board adopted Order No. R9-2005-0005, National Pollutant Discharge Elimination System (NPDES) permit No. CA01 08073, Waste Discharge Requirements for Southern California Edison (SCE). Order No.

R9-2005-0005 establishes the requirements for the discharge flow rate (30-day running average) of up to 1,287 gallons per day of combined discharges of cooling water flows and in-plant waste streams from Outfall 002 at the San Onofre Nuclear Generating Station (SONGS) Unit 2 facility located in northern San Diego County within the boundaries of Camp Pendleton, a United States Marine Corps Base.

.2. By letter dated November 15, 2005, SCE requested an increase in the flow rate limitation for the Unit 1 dewatering waste stream discharge from Unit 1 to the Unit 2 combined discharge from 0.864 MGD to 3.75 MGD. An increased flow rate limitation was also requested for the Unit 1 yard drain waste stream discharge from Unit 1 to the Unit 2 combined discharge from 0.360 MGD to 8.64 MGD.

3. With the exception of the amount of flow, the characteristics of the Unit 1 dewatering waste stream will not change. The SONGS Unit 1 facility is being decommissioned.

The original dewatering flow rate limitation incorporated into the permit was based on SCE's estimate of dewatering needs during the decommissioning process. As the scope of the project became more defined, SCE realized that up to 3.75 MGD would be needed to remove some Unit 1 structures.

4. With the exception of the amount of flow, the characteristics of the Unit 1 yard drain waste stream will not change. The existing Unit 1 yard drain sump is not capable of controlling stormwater from a major rain event. The sump floods and causes closure to part of the Unit 1 plant area. SCE is installing a new yard'drain sump with a capacity of 8.64 MGD in order to prevent plant area closure due to flooding.

Addendum No. 1 to Order No. R9-2005-0005

5. The total requested increase in flow rate for both dewatering and yard drain waste streams is 11.17 MGD, which accounts for less than one percent of the total allowed discharge of 1,287 MGD from Outfall 002. The flow rate and effluent limitations on the combined discharge from Outfall 002 will remain unchanged. The overall impact on the ocean from adoption of the increased dewatering and yard drain flow rate limitations is negligible.

6. Section 1I1,paragraph C of Order No. R9-2005-0005 establishes concentration and mass-based effluent limitations for Total Suspended Solids (TSS), Oil and Grease, and toxic pollutants for the combination of all low volume, in-plant waste streams.

Section 111, paragraph F of Order No. R9-2005-0005 establishes concentration and mass-based effluent limitations for TSS and Oil and Grease for the individual dewatering and yard drain waste streams. Mass-based limitations increase proportionally as flow rate increases. Concentration-based limitations will not change due to increased flow rates.

7. The increased maximum mass-based effluent limitations for TSS, Oil and Grease, and toxic pollutants in the combination of all low volume, in-plant waste streams are expected to slightly lower the existing receiving water quality previously established by Order No. R9-2005-0005. This lowering of water quality, however, is not expected to be significant and is not expected to cause adverse effects to the overall receiving water. Furthermore, historical data indicates that concentrations of pollutants are typically much lower than the effluent limitations. The increase in maximum flow rates for the combination of all low volume, in-plant waste streams will correspond to less than one percent of the total allowed discharge of 1,287 MGD from Outfall 002.

While the maximum allowable mass of pollutants in the in-plant waste streams will increase, this change will be immeasurable in the discharge from Outfall 002. For these reasons, the possible impacts on the Pacific Ocean resulting from the relaxation of mass emission rate limitations in the combination of all low volume, in-plant waste streams are negligible. An antidegradation analysis is not required.

8. The issuance of this Addendum is exempt from the requirements for preparation of environmental documents under the California Environmental Quality Act in accordance with Section 13389 of the Porter Cologne Water Quality Control Act.

9. This Regional Board has considered all environmental factors associated with the proposed and existing discharges.

10. This Regional Board has notified Southern California Edison and all known interested parties of its Intent to modify Order No. R9-2005-0005.

11 .This Regional Board, In a public hearing, heard and considered all comments pertaining to the modification of Order No. R9-2005-0005.

IT IS HEREBY ORDERED, that the following modifications shall be made to Order No.

R9-2005-0005:

Addendum No. 1 to Order No. R9-2005-0005

1. The effluent limitations for the combined low volume, in-plant waste streams in section 1I1,paragraph C.2 shall be replaced with the following.

30-Day Averaee ' Dail Max.

Constituent mgL Ilbs/day rmgIL lbs/day TSS 30 6.1 E+03 100 2.0E+04 O&G 15 3.QE+03 20 4.1 E+03

2. The mass-based effluent limitations for the combined low volume, in-plant waste streams in section Jll, paragraph C.3 shall be replaced with the following.

Limitations For Protection of Mari e Aquatic Life Constituent Units 6-Month Median DalM Arsenic lbs/day 1 .2E+01 6.5E+01 Cadmium lbs/day 2.2E+00 8.SE+OO Chromium (hexavalent)' 0' lbs/day 4.5E+00 1 .8E+O1 Copper lbs/day 2.6E+00 2.3E+01 Lead lbs/day 4.5E+00 1.8E+01 Mercury lbs/day 88E-02 3.6E-01 Nickel lbs/day 1.1 E+01 4.5E+01 Selenium lbs/day 3.4E+01 1 .3E+02 Silver lbs/day 1.2E+O0 5.9E+00 Zinc lbs/day 2.8E+01 1 .GE+02 Cyanide1"' bsiday 2.2E+00 8.9E+00 Ammonia bs/day 1.3E+03 5.4E+03 Non-Chlorinated Phenolic Compounds Ibs/day 6.7E+01 2.7E+02 Chlorinated Phenolics lbs/day 2.2E+00 8.9E+O0 Endosulfan lbs/day 2.OE-02 4.0E-o2 Endrin lbs/daY 4.5E-03 8.9E-03 HCH Ibs/day 8.9E-03 1.8E-02 Limitations For Protection of Human Health - Non Carcinogens Constituent Units 30-Day Average72' Acrolein Ibs/day 4.9E+02 Antimony lbs/day 2.7E+03 3is (2-chloroethoxy) methane lbs/day 9.8E+0o Bis (2-chloroisopropyl) ether lbs/day 2.7E+D3 Chlorobenzene lbs/day 1.3E+03 Chromium (trivalent) ibs/day 42E+05 Di-n-butyl phthalate lbs/day 7.8E-03 Dichlorobenzenes lbs/day 1.1 E+04 Diethyl phthalate Ibs/day 7.4E+04

Addendum No. 1 to Order No. R9-2005-0005 IDimethyl phthalate Ibs/day 1.8E+06 4,6-dinitro-2-rethylphenol s 4.9E+02 2,4-dinitrophenol lbs/day 8.9E+00 Ethylbenzene __Ibsday 9.2E+03 Fluoranthene Ibs/day 3.4E+01 Hexachlorocyclopentadiene _ bs/day 1_.3E+02 Nitrobenzene Ibs/day 1.1 E+01 Thalliu m Ibs/day 4.5E+OO Toluene Ibs/day .1 .9E+05 1,1,1-trichloroethane Ibs/day 1.2E+06 ITributyltin Ibs/day 3.1 E-w3 Limitations For Protection of Human Health - Carcinogens Constituent Units 30-Day Average' 2' Acrylonitrile Ibs/day 2.2E-0 1 Aldrin Ibs/day 4.9E-05 Benzene Ibsfday 1.3E+01 Benzidine Ibs/day 1.5E-04 leyllium Ibs/day 7.4E-02 Bis (2-chloroethyl) ether Ibs/day 1.0E-01 Bis (2-ethyihexyl) phthalate lbs/day 7.SE+0.

Carbon tetrachloride Ibs/day 2.0E+OO Chlordane Ibs/day 5.1 E-05 Chlorodibromomethane lbs/day 1.9Eu01 Chloroform Ibs/day 2.9E+02 DDT Ibs/day 3.8E-04 1,4-dichlorobenzene Ibs/day 4.OE+01 3,3'-dichlorobenzidine Ibs/day 1.8E-02 1,2-dichloroethane lbs/day 6.3E+01 1,1 -dichloroethylene lbs/day 2.0E+00 Dichlorobromomethane Ibsday 1.4E+O1 Dichloromethane lbs/day 1.DE+03 1,3-dichloropropene lbs/day 2.0E+01 Dieldrin Ibs/day 8.9E-05 2,4-dinitrotoluene lbs/day 5,8E+O0 1,2-diphenylhydrazine lbs/day __E__1 Halomethanes lbs/day 2.9E+02 Fleptachlor _lbs/day 1.1 E-04 Heptachlor epoxide lbs/day 4.5E___

Hexachlorobenzene lbs/day 4.7E-04 Hexachlorobutadiene lbs/day 3.1E+01 Hexachloroethane lbs/day 5.6E+OO Isophorone lbs/day 1.6E+03 N-nitrosodimethylamine lbs/day 1.6E+01

Addendum No. 1 to Order No. R9-2005-0005 N-nitrosodi-N-Propylamine Ibs/day 8.5E-01 N-nitrosodiphenylamine lbs/day S.6E+00 PAHs lbs/day 2.OE-02 PCBs Ibs/day 4.2E-05 TDD equivalents lbs/day 8.7E-09 1,1 ,2,2-tetrachloroethane 5bs/day 5.1 E+O0 Tetrachloroethylene lbs/day 4.5E+00 Toxaphene lbs/day 4.7E-04 Trichloroethylene lbs/day 6.OE+/-01 1,1 ,2-trichloroethane Ibs/day 2.1 E+i01 Limitations For Protection of Human Health - Carcinogens Constituent Units 30-Day Average 2,4,6-trichlorophenol lbs/day 6.5E-01 Vinyl chloride Ibs/day 8.0E+01

3. The flow rate and mass-based effluent limitations for the Unit 1 yard drain waste stream (Outfall 001-E) and Unit 1 dewatering waste stream (Outfall 001-F) in section III, paragraph F shall be replaced with the following.

Outfall Low Total Suspended Oil & Grease Numbe Volume Max Flow Units Solids (TSS)____

r Wastewate (MGD) 30-Day Daily 30-Day Daily r Source _ Avg. Max. Avg. Max.

001-E* Yard Drains 8.64 lbs/day 2.2E+0 7.2E+O 1.1 E+O 1.4E+0

_______ Dewatering ________ _ y 3 3 3 3 001 -F* Dewatering 3.75 lbs/day 2 31 2 -. 2.7+

E 1,John H. Robertus, Executive Officer, do hereby certify the foregoing is a full, true and correct copy of an Addendum adopted by the California Regional Water Quality Control Board, San Diego Region, on April 12, 2006.

JOHN H. ROBERTUS Executive Officer

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD SAN DIEGO REGION ADDENDUM NO. 1 TO ORDER NO. Rg-2005-0006 NPDES PERMIT NO. CAD108181 WASTE DISCHARGE REQUIREMENTS FOR SOUTHERN CALIFORNIA EDISON DISCHARGE TO THE PACIFIC OCEAN THROUGH OUTFALL 003 FROM SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 3 SAN DIEGO COUNTY The California Regional Water Quality Control Board, San Diego Region (hereinafter Regional Water Board), finds that:

1. On May 11, 2005, this Regional Water Board adopted Order No. R9-2005-0006, National Pollutant Discharge Elimination System (NPDES) permit No. CAO1 08181, Waste Discharge Requirements for Southern California Edison (SCE). Order No.

R9-2005-0006 establishes the requirements for the discharge flow rate (30-day running average) of up to 1,287 gallons per day of combined discharges of cooling water flows and in-plant waste streams from Outfall 003 at the San Onofre Nuclear Generating Station (SONGS) Unit 3 facility located in northern San Diego County within the boundaries of Camp Pendleton, a United States Marine Corps Base.

2. By letter dated November 15, 2005, SCE requested an increase in the flow rate limitation for the Unit 1 dewatering waste stream discharge from Unit 1 to the Unit 3 combined discharge from 0.864 MGD to 3.75 MGD. An increased flow rate limitation was also requested for the Unit 1 yard drain waste stream discharge from Unit 1 to the Unit 3 combined discharge from 0.360 MGD to 8.64 MGD.

3. With the exception of the amount of flow, the characteristics of the Unit 1 dewatering waste stream will not change. The SONGS Unit I facility is being decommissioned.

The original dewatering flow rate limitatIon incorporated into the permit was based on SCE's estimate of dewatering needs during the decommissioning process. As the scope of the project became more defined, SCE realized that up to 3.75 MGD would be needed to remove some Unit I structures.

4. With the exception of the amount of flow, the characteristics of the Unit 1 yard drain waste stream will. not change. The existing Unit 1 yard drain sump is not capable of controlling stormwater from a major rain event. The sump floods and causes closure to part of the Unit 1 plant area. SCE is installing a new yard drain sump with a capacity of 8.64 MGD in order to prevent plant area closure due to flooding.

Addendum No. 1 to Order No. R9-2005-0006

5. The total requested increase in flow rate for both dewatering and yard drain waste streams is 11.17 MGD, which accounts for less than one percent of the total allowed discharge of 1,287 MGD from Outfall 003. The flow rate and effluent limitations on the combined discharge from Outfall 003 will remain unchanged. The overall impact on the ocean from adoption of the increased dewatering and yard drain flow rate limitations is negligible.

6.Section III, paragraph C of Order No. R9-2005-0006 establishes concentration and mass-based effluent limitations for Total Suspended Solids (TSS), Oil and Grease, and toxic pollutants for the combination of all low volume, in-plant waste streams.

Section III, paragraph F of Order No. R9-2005-0006 establishes concentration and mass-based effluent limitations for TSS and Oil and Grease for the individual dewatering and yard drain waste streams. Mass-based limitations increase proportionally as flow rate increases. Concentration-based limitations will not change due to increased flow rates.

7. The increased maximum mass-based effluent limitations for TSS, Oil and Grease, and toxic pollutants in the combination of all low volume, in-plant waste streams are expected to slightly lower the existing receiving water quality previously established by Order No. R9-2005-0006. This lowering of water quality, however, is not expected to be significant and is not expected to cause adverse effects to the overall receiving water. Furthermore, historical data indicates that concentrations of pollutants are typically much lower than the effluent limitations. The increase in maximum flow rates for the combination of all low volume, in-plant waste streams will correspond to less than one percent of the total allowed discharge of 1,287 MGD from Outfall 003.

While the maximum allowable mass of pollutants in the in-plant waste streams will increase, this change will be immeasurable in the discharge from Outfall 003. For these reasons, the possible impacts on the Pacific Ocean resulting from the relaxation of mass emission rate limitations in the combination of all low volume, in-plant waste streams are negligible. An antidegradation analysis is not required.

8. The issuance of this Addendum is exempt from the requirements for preparation of environmental documents under the California Environmental Quality Act in accordance with Section 13389 of the Porter Cologne Water Quality Control Act.

9. This Regional Board has considered all environmental factors associated with the proposed and existing discharges.

10.This Regional Board has notified Southern California Edison and all known interested parties of its intent to modify Order No. R9-2005-0005.

11.This Regional Board, in a public hearing, heard and considered all comments pertaining to the modification of Order No. R9-2005-0005.

Addendum No. 1 to Order No. R9-2005-0006 IT IS HEREBY ORDERED, that the following modifications shall be made to Order No.

R9-2005-0006:

1. The effluent limitations for the combined low volume, in-plant waste streams in section IlIl, paragraph C.2 shall be replaced with the following.

30-Day verage Daily Max. 6 Constituent mg/L lbs/day mg/L lbs/day TSS 30 6.1 E+03 100 2.OE+04 O&G 15 3.OE+03 20 4.1 E+03

2. The mass-based effluent limitations for the combined low volume, in-plant waste streams in section III, paragraph 0.3 shall be replaced with the following.

Limitations For Protection of Marine Aquatic Life Constituent Units 6-Month Median"' Daily MaxY Arsenic lbs/day 1 .2E+01 6.5E+01 Cadmium lbs/day 2.2E+00 8.9E+00 Chromium (hexavalent'1 01 bs/dav 4.5E+00 I.8E+01 Copper lbs/day 2.6E+00 2.3E+01 Lead lbs/day 4.5E+00 1.8E+01 Mercury lbs/day 8.8E-02 3.6E-01 Nickel lbs/day 1.1 E+01 4.5E+01 Selenium Ibs/day 3.4E+O1 1.3E+02 Silver lbs/day 1.2E+00 5.9E+00 Zinc lbs/day 2.8E+01 1.6E+02 Cyanide"' lbs/day 2.2E+00 8.9E+00 Ammonia lbs/day 1.3E+03 5.4E+03 Non-Chlorinated Phenolic Compounds Ibs/dav 6.7E+01 2.7E+02 Chlorinated Phenolics lbs/day 2.2E+00 8.9E+0O Endosulfan lbs/day 2.OE-02 4. DE-02 Endrin lbs/day 4.5E-03 8.9E-03 HCH Ibs/day 8.9E-03 1 .8E-02 rimltations For Protection of Human Health - Non Carcinogens Constituent Units 30-Day Average1 2 '

Acrolein Ibs/day 4.9E+02 Antimony Ibs/day 2.7E+03 Bis (2-chloroethoxy) methane Ibs/day 9.8E+00 B(2-chloroisopropyl) ether Ibs/day 2.7E+03 Chlorobenzene lbs/day 1.3E+03 Chromium (trivalent) lbs/day 4.2E+05 Di-n-butyl phthalate lbs/day 7.8E+03

Addendum No. 1 to Order No. R9-2005-0006 lDichlorobenzenes lbs/day 1.1 E+04 Diethyl phthalate lbs/day 7.4E+04 Dimethyl phthalate lbs/day 1.8E+06 4,6-dinitro-2-methylphenol lbs/day 4.9E+02 2,4-dinitrophenol lbs/day 8.9E+OD Ethylbenzene lbs/day 9.2E+03 FMuoranthene lbs/day 3.4E+01 Hexachlorocyclopentadiene lbs/day 1.3E+02 Nitrobenzene lbs/day 1A E+01 Thallium lbs/day 4.SE+DD Toluene lbs/day 1.9E+05 1,1,1-trichloroethane lbs/day 1.2E+06 Tributyltin S3.1 E-03 Limitations For Protection of Human Health - Carcinogens Constituent Units 30-Day Average' Acrylonitrile lbs/day 2.2E-01 Aldrin Ibs/day 4.9E-05 Benzene lbs/day 1.3E+01 Benzidine lbs/day 1.5E-04 Bearlium lbs/day 7A4E-02 Bis (2-chloroethyl) ether lbs/day 1_.OE-01 Bis (2-ethylhexyl) phthalate Ibs/day 7sE+00 Carbon tetrachloride lbsiday 2.OE+00 Chlordane lbs/day 5.1 E-05 Chlorodibromomethane lbs/day 1 9E+01 Chloroform lbs/day 2.9E+02 DDT lbs/day 3.8E-04 1 ,4-dichlorobenzene lbs/day 4.OE+01 3,3'-dichlorobenzidine lbs/day 1.8E-02 1,2-dichloroethane lbsJday 6.3E201 1,1 -dichloroethylene lbs/day 2.0E+00 Dichlorobromomethane lbs/day 1.4E+Dl Dichloromethane lbs/day 1.OE+03 1,3-dichloropropene lbs/day 2.OE+01 Dieldrin lbs/day 8.9E-05 2,4-dinitrotoluene lbs/day 5.8E+OO 1,2-diphenylhydrazine lbs/day . 3.6-01 Halomethanes lbs/day 2.9E+02 Heptachlor Ibs/day 1.1 E-04 Heptachlor epoxide lbs/day 4.5E-05 Hexachlorobenzene lbs/day 4.7E-04 Hexachlorobutadiene lbs/day 3.1E+01 Hexachloroethane lbs/day 5.6E+00

Addendum No. 1 to Order No. R9-2005-0006 Isophorone lbs/day 1.6E+03 N-nitrosodimethylamine lbs/day 1_.6E+01 N-nitrosodi-N-propylamine Ibs/day 8.6E-01 N-nitrosodiphenylamine _ bs/da_ 5.6E+00 PAHs Ibstdav 2.0E-02 PCBs Ibstday 4.2E-05 TCDquvletsIbs/day 8.7E-09 1 1,2,2-tetrachloroethane Ibs/da 5.1 E+00 T-etrachloroethylene lbs/day 4.5 E+00 Toxaphene lbs/day 4.7E-04 Trichloroethvlene lbs/dav 6.OE+01 1,1 ,2-trichloroethane lbs/day 2.1 E+01 Limitations For Protection of Human Health - Carcinogens Constituent Units 30 Day Average 1 2 2 ,4,6-trichlorophenol lbs/day 6.5E-01 Vinyl chloride lbs/day 8.OE+01

3. The flow rate and mass-based effluent limitations for the Unit 1 yard drain waste stream, (Outfall 001 -E) and Unit 1 dewatering waste stream (Outfall 001 -F) in section ll, paragraph F shall be replaced with the following.

outfall Low Total Suspended Oil & Grease Volume Max Flow Solids TSS)

Numbe Wastewate (MGD) Units 30-Da Dally 30-Day Dally r r Source Avg. Max. Avg. Max.

001-E* Yard Drains 8.64 lbs/day 2.2E+0 7.2E30 1.1E+0 1.4E+0 001_ ____ 3

________ I3

____ _ 3 3 001-F* Dewatering 3.75 lbs/day 2

.4+ 31 2 247+O6SE 1,John H. Robertus, Executive Officer, do hereby certify the foregoing is a full, true and correct copy of an Addendum adopted by the California Regional Water Qualit Control Board, San Diego Region, on April 12,2006.

& JOHN H. ROBERTUS Executive Officer