View source for DCL-2013-506, NPDES Permit No. CA0003751 - Annual Data Summary Tables and Plots Are Attached to the Ciwqs Application Submittal.

{{Adams
| number = ML13079A068
| issue date = 02/27/2013
| title = NPDES Permit No. CA0003751 - Annual Data Summary Tables and Plots Are Attached to the Ciwqs Application Submittal.
| author name = Cortese K
| author affiliation = Pacific Gas &amp; Electric Co
| addressee name = 
| addressee affiliation = NRC/NRR, State of CA, Regional Water Quality Control Bd
| docket = 05000275, 05000323
| license number = 
| contact person = 
| case reference number = CA0003751, DCL-2013-506
| document type = Letter type:DCL, NPDES Permit
| page count = 39
}}

=Text=
{{#Wiki_filter:Pacific Gas and Electric Company Pacific Gas and                                           Diablo Canyon Power Plant Electric Company                                          P.O. Box 56 Avila Beach, CA 93424 PG&E Letter DCL-2013-506 Electronic Submission CIWQS Web Application February 27, 2013 California Regional Water Quality Control Board Central Coast Region Attn: Monitoring and Reporting Review Section 895 Aerovista, Suite #101 San Luis Obispo, CA 93401-7906 In accordance with Order 90-09, NPDES No. CA0003751, the 2012 Annual Report on Discharge Monitoring at Diablo Canyon Power Plant is provided. This letter and accompanying annual data summary tables and plots are attached to the CIWQS application submittal.
Facility Name:                       Diablo Canyon Power Plant Address:                             P.O. Box 56 Avila Beach, CA 93424 Contact Person:                      Bryan K. Cunningham Job

==Title:==
Supervisor, Environmental Operations Phone Number:                        (805) 545-4439 WDR/NPDES Order Number:               Order No. 90-09, NPDES No. CA0003751 Type of Report: (check one)                    QUARTERLY                         ANNUAL 0                          []
Quarter: (check one):                    Ist 2nd              3 rd            4 th 0               1:1             0            01 Year:                               '2012      (Annual Reports for DCPP are Jan-Dec)
Violation(s) (Place an X by the appropriate choice):                 l[] No (there are no violations to report)           0     Yes Note: Reference "Review of Compliance Record and CorrectiveActions" Section NJ

PG&E Letter DCL-2013-506 CRWQCB Central Coast Region February 27, 2013 Page 2 If Yes is marked (complete a-g):
a) Parameter(s) in Violation:
b) Section(s) of WDRINPDES Violated:
c) Reported Value(s) d) WDR/NPDES Limit/Condition:
e) Dates of Violation(s)
(reference page of report/data sheet):
f) Explanation of Cause(s):       (If "YES", see overview section of attached report)
(attach additional information as needed) g) Corrective Action(s):          (If "YES", see overview section of attached report)
(attach additional information as needed)

PG&E Letter DCL-2013-506 CRWQCB Central Coast Region February 27, 2013 Page 3 I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. The results of the influent and effluent monitoring presented are the observed results of the measurements and analyses required by the monitoring program, and is neither an assertion of the adequacy of any instrument reading or analytical result, nor an endorsement of the appropriateness of any analytical or measurement procedure. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.
If you have any questions or concerns, or require additional information, please contact Bryan Cunningham at (805) 545-4439.
Sincerely, Name:      Kenneth W. Cortese

==Title:==
Manager, Chemistry and Environmental Operations- Diablo Canyon Power Plant 2013506/jlkbkc

PG&E Letter DCL-2013-506 CRWQCB Central Coast Region February 27, 2013 Page 4 cc:                PDF Formatted Copy of CIWQS Application Submittal:
Regional Administrator U.S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 Hardcopv Print-Out of CIWQS Application Submittal:
U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Thomas Hipschman Senior Resident Inspector U.S. Nuclear Regulatory Commission Diablo Canyon Power Plant 104/5

ClWQS Web Application Submittal Print Out and Attached Supporting Documents eSMR PDF Report Summary: Annual SMR ( MONNPDES ) report for 2012 Summary: Annual SMR ( MONNPDES ) report for 2012 submitted by Kenneth Cortese(No Title) on 02/28/2013.
Facility Name: PG&E DIABLO CANYON POWER PLANT Order Number: R3-1990-0009 Waterboard Office: Region 3 - Central Coast                 Case Worker: Peter Von Langen Report Effective Dates: 01/01/2012 - 12/31/2012 No Discharge Periods Diablo M-001 Diablo M-00I D Diablo M-00IF Diablo M-00 IG Diablo M-00IH Diablo M-0011                                                                01/01/2012 - 12/31/2012 Diablo M-001J Diablo M-00IK                                                                01/01/2012 - 12/31/2012 Diablo M-00 IL Diablo M-001M Diablo M-OOIN Diablo M-001P Diablo M-002 Diablo M-003 Diablo M-004 Diablo   M-005 Diablo   M-008 Diablo   M-009 Diablo   M-013 Diablo   M-015 Diablo   M-016                                                               01/01/2012 - 12/31/2012 jiablo M-017                                                               01/01/2012 - 12/31/2012 Diablo  M-1NF Self-Determined Violations
                                 -Violation Type,                                               ,.        Deseription..'1/4;,.'*
In...        .           T.'orrective:Action        OccurreencelDate No Violations Entered Attachments Flle,Names    .:    ',, .     ..            ...  , FileDescription        ".                  Upload Date,  - 2012 DCPP Annual Report Overview Section.pdf 2012 Annual Summary Report on Discharge                     02/27/2013 Monitoring at Diablo Canyon Power Plant  - 2012 DCPP Annual Rpt Appendix-I NPDES           DCPP NPDES Discharge Points Table                        02/27/2013 Discharge Pints.pall  - 2012 DCPP Annual Rpt Appendix-2 Tabular         Tabular Summaries of Influent and Effluent               02/27/2013 Summaries of Monitoring.pdf                                    Monitoring  -2012 DCPP Annual Rpt Appendix-3 Graphical        Graphical Summaries of Influent and Effluent             02/27/2013 Summaries of Monitoring.pdf                                    Monitoring  - 2012 DCPP Annual Rpt Appendix-4 Summary of      Summary of Receiving Water Monitoring                    02/27/2013 RWMP Monitoring.pdf                                            Program (RWMP) Activities Cover Letter (Uploaded File)
GE DCL2013506 2012 NPDES Annual Discharge Monitoring Report.pdf                                                                                         2013-02-27 16:45:36.0        702040byte

Data Summary Analytical Results No Analytical Data Measurements Available / Reported Calculated Values Parnmeter       Cal.CulationType    Sample I.. Analysis      QuafierA Rebi:t Unt s.Method.! Minimum  Reporting fleview    QA        Commenft..      DtanSource DateTie      DIate.............                  Detection LoLeve   Luwt:. Priority Codes*
                                                      .                                                Lii                       iidicato'r No Calculated Data Measurements Available / Reported Certificate I certify under penalty of law that all data submitted, including attachments, were prepared under my direction in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of a fine or imprisonment, for knowing violations. I certify that I am Kenneth Cortese and am authorized to submit this report on behalf of PG&E DIABLO CANYON POWER PLANT. I understand that I am submitting a Annual SMR ( MONNPDES) report for 2012 and I understand that data submitted in this report can be used by authorized agencies for water quality management related analyses and enforcement actions, if required. I certify that I have not violated any term in my Electronic Signature Agreement. and that I am otherwise without any reason to believe that the confidentiality of my password and challenge question answers have been compromised now or at any time prior to this submission. I understand that this attestation of fact pertains to the implementation, oversight, and enforcement of a federal environmental program and must be true to the best of my knowledge.
Name: Kenneth Cortese

==Title:==
No Title

ANNUAL 

==SUMMARY==
REPORT ON DISCHARGE MONITORING AT THE DIABLO CANYON POWER PLANT (NPDES NO. CA0003751) 2012

PG&E Letter No. DCL-2013-506 2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant TABLE OF CONTENTS PAAGE OVERVIEW                                                                        1

==SUMMARY==
OF MONITORING PROGRAM                                                   1 A. Monitoring of Plant Influent and Effluent                                1
: 1. Monitoring Data                                                       1
: 2. Facility Operating and Maintenance Manual                             1
: 3. Laboratories Used to Monitor Compliance                               2
: 4. Review of Compliance Record and Corrective Actions                    2 B. Monitoring of Receiving Water                                            5
: 1. Ecological Studies at Diablo Canyon                                   5
: 2. In-Situ Bioassay                                                      5 C. Sodium Bromide Treatment Program                                         5 D. Errata                                                                   5 APPENDICES Appendix 1-     NPDES Discharge Points Appendix 2-     Tabular Summaries of Influent and Effluent Monitoring Appendix 3-     Graphical Summaries of Influent and Effluent Monitoring Appendix 4-     Summary of RWMP Monitoring for 2012

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant OVERVIEW This annual summary report follows the format used in quarterly monitoring reports. Analytical results below the respective analytical detection limit (ND or non-detect) are plotted as a "zero" value in accordance with ELAP guidance. Results between the analytical detection limit and reporting (quantitation) limits are plotted at the value and shown as 'DNQ' in the tabular summaries as is done for CIWQS reports. Less-than results are typically reported to express an average of values that include non-detects and at least one positive result.
These less-than results are plotted conservatively at the value. During 2012, discharges occurred from all discharge paths except 0011, 001 K, 016, and 017.
California Ocean Plan Table B substances that were not analyzed for have not been added to the discharge stream. The substances listed in Table B in the California Ocean Plan were each analyzed for and reported in the permit renewal application and application updates for Diablo Canyon Power Plant (DCPP) submitted in October 1994, January 2001, and April 2011. There have been no changes in activities conducted at the plant that would have significantly affected the results previously reported in the above referenced documents.

==SUMMARY==
OF MONITORING PROGRAM A. Monitoring of Plant Influent and Effluent
: 1. Monitoring Data
: a. Appendix 1 provides a list of discharge path names for ease of reference. Appendix 2 contains monitoring data in tabular form. Appendix 3 contains monitoring data in graphical form.
: b. Annual oil and grease analyses were performed in October on Stormwater/Yard Drain Discharges 005, 008, 009, 013, and 015. Results are listed below. No discharges that resulted in adequate sample quantities occurred from pathway 016, and no discharge occurred from pathway 017 during 2012.
005      non-detect - ND(1.4 mg/I) 008      non-detect - ND(1.4 mg/I) 009      Value below reporting quantity - DNQ(2.3 mg/I) 013      non-detect - ND(1.4 mg/I) 015      Value below reporting quantity - DNQ(2.5 mg/I)
: c. In October, Discharge 001D (Liquid Radioactive Waste Treatment System) annual grab samples for lithium, boron, and hydrazine were collected and analyzed. The results were 0.076 mg/I, 804 mg/I, and DNQ(0.002) mg/I, respectively.
: 2. Facility Operating and Maintenance Manual Pacific Gas and Electric Company (PG&E) maintains a multiple volume Plant Manual at DCPP that contains procedures used for operation and maintenance activities at the plant, including those activities that relate to wastewater handling, treatment, sampling, analysis and discharge.
Plant procedures are prepared and reviewed by DCPP Staff and approved by DCPP Management. The facility conducts biennial internal audits that review NPDES procedures contained in the plant manual.
Ongoing reviews of plant procedures are conducted to assure that the manual remains valid, current, and complete for the facility.
1
: 3. Laboratories Used to Monitor Compliance The following laboratories were used during 2012 for monitoring compliance. The laboratories are certified by appropriate agencies for the tests/analyses performed. As part of the on-going annual certification process, these laboratories take part in annual performance evaluation testing.
: a. PG&E Chemistry Laboratory, DCPP, Avila Beach, California (EPA Lab # CA01 036)
: b. Aquatic Bioassay Consulting Laboratories, Ventura, California (EPA Lab # CA01907)
: c. ALS Environmental (formerly Columbia Analytical Services), Kelso, Washington (EPA Lab #
WA00035)
: d. TestAmerica, Inc., Earth City, Missouri (EPA Lab # M000054)
: e. Abalone Coast Analytical, San Luis Obispo, California (EPA Lab # CA02661)
: f. Oilfield Environmental and Compliance, Santa Maria, California (EPA Lab # CA02438)
: g. E. S. Babcock & Sons, Inc., Environmental Laboratories, Riverside, California (EPA Lab # CA00102)
: h. BSK Associates, Fresno, California (EPA Lab # CA00079)
: 4. Review of Compliance Record and Corrective Actions
: a. Circulating Water Pump Chlorination/Bromination Monitoring The 2012 quarterly NPDES reports discuss chlorination cycles when discharge monitoring was interrupted. These events are listed below with brief descriptions of the cause and respective corrective action. When these monitoring interruptions occurred, engineering evaluations (as approved by the CCRWQCB January 13, 1994; PG&E Letter No. DCL-94-002) were performed.
Detailed descriptions of these evaluations are included in the quarterly reports. Evaluations concluded that discharge chlorine limits were not exceeded during these events.
Chlorination Cycle Date           Monitoring                     Cause                      Corrective Action Interruptions 01 /16/12 to         Unit 1 &2          Cross-tie between monitor       Monitor sample line cross-tie 01/17/12         11 Readings            sample lines left open               valves closed 06/07/12 to            Unit 2        Discharge monitor quality check        Monitor recalibrated 06/13/12         36 Readings             low out of tolerance 09/19/12 to            Unit 2 09/20/12          7 Readings         Monitor reagent pump failed        Reagent pump replaced
: b. Closed Cooling Water Releases During 2012, maintenance activities that required draining of closed cooling water systems were performed, and are summarized below. PG&E received concurrence from the CCRWQCB in response to letters dated July 19, 1995 (PG&E Letter DCL-95-156), May 23,1996 (PG&E Letter DCL-96-522), and May 19, 1997 (PG&E Letter DCL-97-533) regarding the use of glutaraldehyde and isothiazolin to control microbiological growth and corrosion in DCPP's freshwater closed cooling water systems. Any drainage from these systems is discharged at a flow-rate such that the chronic toxicity level is below the "No Observable Effect Concentration" (NOEC) at NPDES Discharge 001.
2

The volumes of cooling water drained in 2012 from the component cooling water (CCW), service cooling water (SCW), and intake cooling water (ICW) systems are presented below. The glutaraldehyde (Glut) and isothiazoline (Iso) concentrations presented in the table are system concentrations, not concentrations at the point of discharge to receiving water.
Volume       Glut                 Total        Oil &         Reason &
Date           System      (gallons)   (mg/I) Iso (mg/It Suspended      Grease         Comments Solids (mg/I)   (mg/I) 01/04/12       Unit 1 SCW     12,000      < 50      5.4        < 2.0        < 1.4    Routine Maintenance 01/13/12       Unit 1 SCW        10       114       5.4         n/a          n/a     Routine Maintenance 01/13/12       Unit 2 SCW        10       115       4.0         n/a          n/a     Routine Maintenance 01/25/12       Unit 2 SCW        57       < 50      4.0         n/a          n/a     Routine Maintenance 02/08/12       Unit 2 SCW        30       111       5.2         n/a          n/a     Routine Maintenance 02/12/12       Unit 1 ICW        10       112       0.7         n/a          n/a     Routine Maintenance 03/06/12       Unit 2 SCW     33,200      < 50      5.8        < 2.0        < 1.4    Routine Maintenance 03/13/12       Unit 2 SCW       550       < 50      5.8         n/a          n/a     Routine Maintenance 03/15/12       Unit 2 SCW        70       < 50      5.8         n/a          n/a     Routine Maintenance 03/26/12       Unit 2 ICW         9       148       0.7         n/a          n/a     Routine Maintenance 04/16/12       Unit 1 ICW        10        65       2.4         n/a          n/a     Routine Maintenance 04/25/12       Unit I SCW      9,500       86       3.4         n/a          n/a     Routine Maintenance 05/19/12       Unit I CCW     181,500     125       0.0        < 2.0         1.5     Routine Maintenance 06/11/12       Unit 1 ICW        15        64       4.5         n/a          n/a     Routine Maintenance 06/26/12       Unit 1 CCW      3,200      177       0.0        < 2.0        < 1.4    Routine Maintenance 06/28/12       Unit 2 SCW     33,200      < 50      4.7         7.2         < 1.4    Routine Maintenance 08/05/12       Unit 1 SCW        10       < 50      4.1         n/a          n/a     Routine Maintenance 08/14/12       Unit 1 SCW     33,500      < 50      4.1         3.5         < 1.4    Routine Maintenance 12/04/12       Unit 2 ICW      3,300       63        2.5        4.2          n/a     Routine Maintenance 12/19/12       Unit 1 ICW      3,400      < 50       5.8        n/a          n/a     Routine Maintenance
: c. Exceedances None.
: d. Bypasses
: 1. On April 30, 2012, it was discovered that operator action resulted in a bypass of normal discharge pathway 001 F. On April 25th at approximately 23:00, during non-routine plant conditions, operators routed freshwater originating from the plant fire water system to outfall via the clean side of the turbine building sump. Normal routing of this discharge is to the dirty side of the turbine building sump, through the oily water separator system, then overboard. The bypass occurred during power plant recovery efforts caused by a loss of all main seawater circulator pumps, and subsequent forced outage of Unit 2 while Unit 1 was in a scheduled refueling outage.
Routing of the fire water to the clean side of the sump was determined to be inadvertent, as the operators did not intend to purposefully circumvent the normal 001 F permit flow path. At the beginning of the event an assumption had been made that staged hosing in the turbine building was routed to the dirty side of the sump system, when in fact it was routed to the clean side of the sump. It was later found that a verification/review of the configuration to insure appropriate routing before use had also not been completed.
3

Contributing factors to the inadvertent bypass included a significant amount of plant operator burdens during the period. The specific plant conditions experienced were non-routine, having never occurred prior in the operating history of the facility. The shutdown of all main seawater circulators, and subsequent operating unit trip, was due to an excessive influx of sea salps in the near shore coastal region, which adversely impacted the plant intake cove and intake systems.
Note: The plant auxiliary salt water system once-through cooling remained in continuous operation during the period.
Upon plant management discovery of the 001 F pathway bypass on April 30th, samples of the freshwater flow were obtained, and the bypass subsequently terminated. The samples indicted total suspended solids (TSS) of < 2.0 mg/L, conductivity of 126 uS/cm, a pH of 7.7, and a negative result for grease and oil using a camphor screening test. These results confirmed the quality of the freshwater from the plant fire water system was good, as is routinely expected from that resource, and that 001 F outfall constituent limitations were most likely never challenged during the bypass period. Regional Board Staff (von Langen) was notified via phone message of the bypass event following the initial discovery on April 30 . In a follow-up phone conversation conducted on May 1 st, the facility was directed to provide a description of the event, and any subsequent evaluation or actions, in the 2nd quarter discharge self-monitoring report.
The estimated volume of freshwater routed directly to the clean side of the turbine building sump from April 2 5 t to April 30t was 609,900 gallons, or approximately 144,000 gallons per day. Even though the event was linked to an off-normal and very rare plant condition, the facility is implementing corrective actions to reduce and/or eliminate the potential for event reoccurrence.
Relevant plant operating procedures were revised to more clearly outline operator actions and expectations in the event of a similar situation, as well as to enhance the verification of equipment alignment prior to routing water from secondary plant activities to the turbine building sump.
system.
: 2. On October 12, 2012, during routine shift inspections the Unit 1 turbine building sump was discovered overflowing from the clean-side standpipe directly to the once-though cooling system, and plant outfall. The cause was determined to be a loss of sump pump operation resulting in an inadvertent bypass of the normal discharge pathway which routes sump wastewater through the oily water separator (OWS) system prior to outfall. Samples of the overflow were taken. Analysis indicated total suspended solids and oil/grease levels were well below the NPDES limitations for discharge pathway 001 F. The overflow was estimated at a rate of 3 to 5 gallons per minute for an indeterminate period (exact time of pump function loss unknown), but which is approximated to be less than the period elapsed since the prior sump inspection; < 12-hours.
The loss of pump operations was determined to be caused by an out of tolerance liquid level indicator transducer. One function of the-level indicator is to stop pump operation when low liquid levels (near-empty) conditions exist within the sump. Output from the faulty transducer resulted in low level indications when sump volume was actually at high levels. The transducer was recalibrated, and the turbine building sump level indicator and associated sump pumps were returned to normal operations.
Notification of the inadvertent 001 F pathway bypass was made to the Regional Water Quality Control Board on the same day, within the 24-hour reporting requirement. A follow-up communication was made on October 15t to provide analysis results, and request guidance on further reporting of the event. Regional Board staff (von Langen) advised that the event and corrective actions be documented in the 4t quarter discharge self-monitoring report.
4

B. Monitoring of Receiving Water
: 1. Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2012 under the Receiving Water Monitoring Program (RWMP) as requested in a letter from the Central Coast Regional Water Quality Control Board (CCRWQCB) dated December 9, 1998, and as detailed in a letter from PG&E dated January 8, 1999 (DCL-99-503). This program includes tasks from the Ecological Monitoring Program (EMP) with additional stations and increased sampling frequencies. This program replaces the EMP and the Thermal Effects Monitoring Program (TEMP). Several one-year-only tasks outlined in the above letters were completed in 1999 and were not requested to be performed in 2012. Results of 2011 RWMP data were submitted to the CCRWQCB on April 27, 2012. A table in Appendix 4 summarizes requirements and completed monitoring tasks for 2012.
: 2. In Situ Bioassay Results of the Mussel Watch Program are reported to the CCRWQCB directly by the California Department of Fish and Game (CDF&G) in the agency's periodic report for this program.
C. Sodium Bromide Treatment Program DCPP continued its integrated sodium bromide and "foul release coating" strategy to control macrofouling in the Circulating Water System (CWS). The treatment program consists of six 20-minute injections (at four hour intervals) of a blend of generic sodium bromide and sodium hypochlorite into DCPP's seawater intake conduits. Each injection attempts to achieve a target concentration of 200 parts per billion (ppb) Total Residual Oxidant (TRO) at the inlet waterbox of the main condensers. Discharge TRO, measured at the plant outfall, remained below NPDES limitations. Typically, discharge values were between 20 ppb and 50 ppb. In conjunction with the chemical treatment, untreated portions of the cooling water system were previously painted with a non-toxic "foul release coating" to reduce or prevent attachment of fouling organisms.
Both conduits of Unit 1 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day through most of 2012. There were brief interruptions in January, February, March, and early April for system maintenance activities. Unit 1 injections were shut down in mid4April for the 1R1 7 refueling outage. Simultaneous injections were restarted in early June. There were additional brief interruptions in mid-June, November and December for chemical injection system maintenance, and conduit cleaning activities.
Both conduits of Unit 2 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day through most of 2012. There were brief interruptions in January and February for chemical injection system maintenance, and conduit cleaning activities. Additional brief interruptions also occurred in April due to a large influx of sea salps that necessitated shut down of Unit 2 main seawater circulating pumps; and in June, October, and November due to system maintenance activities.
D. Errata Two reporting errors have been identified in the electronic 4 thquarter 2012 discharge self-monitoring report (eSMR) that was submitted via CIWQS. The units for analysis results of Ammonia, Total (as N) at locations M-001 and M-INF (only) were incorrectly reported as pg/L. The correct units for both these results are mg/L.
5

Annual Discharge Monitoring Report APPENDIX I DIABLO CANYON POWER PLANT NPDES DISCHARGE POINTS DISCHARGE NUMBER                           DESCRIPTION 001                      Once-Though Cooling Water 001 A                          Firewater Systems 001 B                 Auxiliary Salt Water Cooling System 001 C                           Discharge Deleted 001 D                      Liquid Radioactive Waste Treatment System 001 E                    Service Cooling Water System 001 F                        Turbine Building Sump 001 G                Make-Up Water System Waste Effluent 001 H                Condensate Demineralizer Regenerant 001 I                   Seawater Evaporator Blowdown 001 J                Condensate Pumps Discharge Header Overboard 001 K                Condenser Tube Sheet Leak Detection Dump Tank Overboard 001 L                     Steam Generator Blowdown 001 M                 Wastewater Holding and Treatment System 001 N                    Sanitary Wastewater Treatment System 001 P                 Seawater Reverse Osmosis System Blowdown 002                 Intake Structure Building Floor Drains 003                           Intake Screen Wash 004                    Bio Lab and Storm Water Runoff 005, 008, 009, 013, 014, 015               Yard Storm Drains 006, 007, 010, 011,012                  Storm Water Runoff 016                 Bio Lab Seawater Supply Pump Valve Drain 017                  Seawater Reverse Osmosis System Blowdown Drain

Annual Discharge Monitoring Report APPENDIX 2 TABULAR SUMMARIES OF INFLUENT AND EFFLUENT MONITORING

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 TEMPERATURE (DEG F)                                            FLOW (MGD)
INFLUENT                       EFFLUENT                 DELTA T SMonth        hi*h      low    avg           high     low    avg          high      avg       high    low      avg JAN         55.6      52.5   54.1          74.4    71.5    73.0         19.4      18.9      2486   2486     2486 FEB        54.8      50.1   52.2          74.5    68.7    71.3         20.2      19.1      2486    1862    2400 MAR         53.1      49.0   50.8          72.1    71.8    74.1         18.9      18.5      2486    1509    2395 APR         52.6      48.4   50.2          71.1    53.5    65.9         19.4      15.7      2486     32     2045 MAY         52.2      48.7   50.2          69.9    66.5    67.9         18.0      17.7      1279    1279    1279 JUN        56.6      49.1   52.3          72.5    62.8    68.1         18.4      15.3      2486    1279    2081 JUL        55.9      50.7   53.0          74.1    68.9    71.3         18.4      18.2      2486    2486    2486 AUG         57.0      52.0   54.0          75.5    70.3    75.3         18.6      18.3      2486    2486    2486 SEP        57.9      53.9   55.6          76.6    71.8    74.1         18.9      18.5      2486    1509    2395 OCT         59.3      55.6   57.2          78.0    74.9    65.0         19.4      17.7      2486    2132    2449 NOV         58.6      55.0   57.3          77.9    73.6    76.2         20.6      19.0      2486    1862    2402 DEC         59.7      54.3   56.8          78.5    72.8    75.5         19.3      18.1      2486    1874    2371 limit:                                              -                  22                 2760 The Influent and Effluent "high" and "low" temperture values correspond to the highest and lowest daily average value for that month. The Influent high and low temperature does not necessarily correspond to the same day as the Effluent high and low temperature for that month. The "avg" temperature for Influent and Effluent is the average for the entire month. The Monthly Delta T "high" is the highest Delta T for a day of the month based on daily average Influent and Effluent temperature values. The "avg" temperature is calculated from Influent and Effluent monthly avg values.
DISCHARGE 001 TOTAL RESIDUAL                         TOTAL CHLORINE CHLORINE (daily max. ug/I)                    USED (lbs/day)
Month      high      low     avg            high      low       avg JAN        54        31      41             576      355       516 FEB        65        17      44             475      158      353 MAR        66        31      49             403      288      370 APR        63      *n/a      41             374      *n/a      256 MAY        89       <20      39             230      173       191 JUN        55       <10      25             518      173       390 JUL        32       <10      12             562      490       522 AUG        39       <10      24             662      562       581 SEP        44       <10      20             662      562       611 OCT        60       <10      30             734      494       639 NOV        39        14      26             706      184       583 DEC        66        18      47             677      346       503 Note: The residual chlorine limits in Permit CA0003751, Order 90-09, is an instantaneous max of 200 ug/l, and includes a time-based limit (per the Ocean Plan) which depends on the length of the respective chlorination cycle.
                     *n/a value for low value in April for total residual chlorine & total chlorine use due to no system injections for one day.
PageI of 6

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ug/l)
CHROMIUM                           COPPER                   NICKEL                        *ZINC Month          Influent       Effluent         Influent     Effluent     Influent     Effluent         Influent  Effluent JAN            ND(5)          ND(5)            ND(5)        ND(5)       DNQ(5)       DNQ(6)            ND(5)      ND(5)
FEB            ND(5)          ND(5)           DNQ(6)       DNQ(6)       DNQ(6)       DNQ(8)            ND(5)     DNQ(7)
MAR            ND(5)          ND(5)            ND(5)        ND(5)       DNQ(6)       DNQ(6)              24      DNQ(8)
APR            ND(5)         DNQ(6)            ND(5)       DNQ(7)       DNQ(6)          10               13      DNQ(5)
MAY            ND(5)          ND(5)            ND(5)       DNQ(5)       DNQ(7)       DNQ(7)            ND(5)      ND(5)
JUN            ND(5)          ND(5)           DNQ(6)        ND(5)       DNQ(7)       DNQ(6)           DNQ(5)      ND(5)
JUL            ND(5)          ND(5)            ND(5)        ND(5)       DNQ(8)       DNQ(8)            ND(5)      ND(5)
AUG            ND(5)          ND(5)            ND(5)        ND(5)       DNQ(8)       DNQ(7)           DNQ(7)      ND(5)
SEP            ND(5)          ND(5)            ND(5)        ND(5)       DNQ(6)       DNQ(6)           DNQ(6)      ND(5)
OCT            ND(5)          ND(5)            ND(5)        ND(5)       DNQ(9)       DNQ(8)              21      DNQ(5)
NOV           DNQ(5)          ND(5)           DNQ(8)       DNQ(7)       DNQ(7)       DNQ(9)           DNQ(7)      ND(5)
DEC           DNQ(7)         DNQ(7)           DNQ(7)       DNQ(6)       DNQ(7)       DNQ(7)              14      DNQ(5) 6-month median limit:              10                -           10                        30                -        70 DISCHARGE 001 VARIOUS ANNUAL ANALYSES (ug/I)                           6-Mo. Med.
Effluent Parameter                            Influent         Effluent          Limit Arsenic                               1.38               1.40            30 Cadmium                              0.036              0.031             10 Cyanide                              ND(3)             ND(3)              30 Lead                                 0.039          DNQ(0.015)            10 Mercury                         DNQ(0.00032)       DNQ(0.00027)          0.2 Silver                            ND(0.004)          ND(0.004)           2.9 Titanium                           ND(50.0)          ND(50.0)           none
                            *Phenolic Compounds               ND(3.031)          ND(3.031)           150 (non-chlorinated)
                            **Phenolic Compounds              ND(0.567)          ND(0.567)            10 (chlorinated)
                            ***PCB's                          ND(0.0658)        ND(0.0658)           none
* Results for analysis of 9 target compounds. The sum of the 9 detection limits is 8.42.
                  ** Results for analysis of 6 target compounds. The sum of the 6 detection limits is 2.02.
                 *** Detection limits shown are the sum of individual detection limits for 7 target compounds.
DISCHARGE 001 AMMONIA (as N) (ug/I)
Month            Influent       Effluent JAN              ND(50)       DNQ(78)
FEB MAR APR            DNQ(67)       ND(50)
MAY JUN JUL AUG               160            300 SEP OCT                86         DNQ(62)
NOV DEC 6-month median limit:           3,060 Page2 of 6

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY pH (averages)
Discharge:                     001                   002              003           004        H0IP Month                Influent    Effluent JAN                  7.9          8.0             8.0             7.9           8.0         7.9 FEB                  8.0          8.0             8.0             7.9           7.9         7.9 MAR                   7.8          7.8             7.9             7.8           7.9         7.6 APR                  7.7          7.8             7.8             7.7           7.7         7.6 MAY                    8.0         8.0             8.0             8.0           8.0         7.7 JUN                  7.9          7.9             7.9             7.9           7.9         7.7 JUL                  7.9          7.9             7.9             7.9           7.9         7.7 AUG                    7.8         7.8             7.8             7.9           7.9         7.6 SEP                   7.8         7.9             7.9             7.8           7.9         7.6 OCT                    7.8         7.9             8.0             8.0           8.0         7.7 NOV                    8.2         8.1             8.0             7.8           7.9         7.7 DEC                   7.9         8.0             8.0             7.9           8.0         7.8 DISCHARGE 001F SUSPENDED GREASE & OIL (mg/I)             SOLIDS (mg/I)
Month           high       ave             high          ave JAN         ND(1.4)      ND(1.4)        ND(2)          ND(2)
FEB         ND(I.4)      ND(1.4)            7            7 MAR         ND(1.4)      ND(1.4)       DNQ(2)         DNQ(2)
APR         ND(1.4)      ND(1.4)       DNQ(4)         DNQ(4)
MAY         ND(I.4)      ND(I.4)        ND(2)          ND(2)
JUN         ND(I.4)      ND(1.4)       DNQ(2)         DNQ(2)
JUL         ND(I.4)      ND(I.4)        ND(2)          ND(2)
AUG         ND(I.4)      ND(I.4)       DNQ(3)         DNQ(3)
SEP         ND(I.4)      ND(I.4)        ND(2)          ND(2)
OCT         ND(I.4)      ND(I.4)       DNQ(2)         DNQ(2)
NOV         ND(I.4)      ND(1.4)       DNQ(2)         DNQ(2)
DEC         ND(1.4)      ND(1.4)        DNO(2)        DNO(2) limit:           20         15              100           30 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.
DISCHARGE 001N (Monthly Summary of Weekly Data)
SUSPENDED                          SETTLEABLE GREASE & OIL (mg/I)                             SOLIDS (mg/I)                      SOLIDS (ml/I)
Month         high           low          ave            high        low          avg           high    low         ave JAN           <5.0       DNQ(1.4)         <5.0            20        ND(3)           9        ND(0.1)   ND(0.1)     ND(0.1)
FEB            5.7        ND(1.4)         <5.0            75          9            27        ND(0.1)   ND(0.1)     ND(0.1)
MAR           <5.0        ND(I.4)         <5.0            26          5            12        ND(0.1)   ND(0.1)     ND(0.1)
APR         DNQ(3.2)      ND(1.4)      DNQ(l.6)           95          10           34        ND(0.1)   ND(0.1)     ND(0.1)
MAY           <5.0        ND(1.4)         <5.0            18          12           15        ND(0.1)   ND(0.1)     ND(0.1)
JUN         DNQ(2.7)      ND(I.4)      DNQ(1.4)           14          4             8        ND(0.1)   ND(0.1)     ND(0.1)
JUL          <5.0        ND(I.4)         <5.0            12        ND(3)           7        ND(0.1)   ND(0.1)     ND(0.1)
AUG         DNQ(I.4)      ND(I.4)      DNQ(1.4)           19          9            14        ND(0.1)   ND(0.1)     ND(0.1)
SEP           7.0       DNQ(1.6)         <5.0            24          11           15        ND(0.1)   ND(0.1)     ND(0.1)
OCT         DNQ(2.8)     DNQ(1.4) DNQ(l.8)                25          9            14        ND(0.1)   ND(0.1)     ND(0.1)
NOV           <5.0        ND(I.4)         <5.0            10          7             9        ND(0.1)   ND(0.1)     ND(0.1)
DEC           <5.0       DNO(I.5)         <5.0            15        ND(3)           7        ND(0.1)   ND(0.1)     ND(0.11 limit:        20                          15              -                       60            3.0                 1.0 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.
Page3 of 6

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D, H, L, F, METALS (avg. ug/l) 001D                                  001 H                              001L                         OO1F Month      A2       Cd       Cr      Cu           Ae      Cd     Cr      Cu        At       Cd      Cr    Cu     Ae       Cd      Cr   Cu JAN      ND(5)    ND(5)   DNQ(6)    26         ND(5)    ND(5)    18      29      ND(5)    ND(5)  ND(5) ND(5)   ND(5)    ND(5)    214   15 FEB MAR APR      ND(5)    ND(5)    ND(5)    11         ND(5)    ND(5)    34      88      ND(5)    ND(5)  ND(5) DNQ(5)  ND(5)    ND(5)   ND(5)  20 MAY JUN JUL      ND(5)    ND(5)   DNQ(5)     17        ND(5)    ND(5)    25      49      ND(5)    ND(5)  ND(5) ND(5)   ND(5)    ND(S)   ND(5)  16 AUG SEP OCT      ND(5)    ND(5)    ND(5)    20         ND(5)    ND(5)    17      30      ND(5)    ND(5)  ND(5) ND(5)   ND(5)    ND(5)   ND(5)  12 NOV DEC limit: none Note: 001D, 001H and 001L analyses performed on quarterly composites.
00IF analyses performed quarterly on a composite of weekly samples.
DISCHARGE 001D, H, L, F, METALS (avg. ug/I) 001D                                 001 H                               001L                        001F Month       He      Ni       Pb      Zn           He      Ni     Pb      Zn        Ha       Ni      Pb    Zn     H.       Ni      Pb   Zn
                                                                                                                                           -.- I JAN     ND(0.050) DNQ(9)   ND(5)    127      ND(0.050)   13      13      23     ND(0.050) ND(5)  ND(5)  ND(5) ND(0.050)  88    DNQ(7)  17 FEB MAR APR     ND(0.060) ND(5)    ND(5)     63       ND(0.060)   15     10      71     ND(0.060) DNQ(5) ND(5)  ND(5) ND(0.060)  11     ND(5)  30 MAY JUN JUL     ND(O.060) ND(5)    ND(5)     86       ND(0.060)  21    DNQ(9)   <10     ND(0.060) ND(5)  ND(5)  ND(5) ND(0.060)   10    ND(5)  26 AUG SEP OCT     ND(0.060) ND(5)    ND(5)     75       ND(0.060)   14    <10   DNQ(8)    ND(0.060) ND(5)  ND(5)  ND(5) ND(0.060)   10    ND(5) 23 NOV DEC limit: none Note: 001D, 001H and 001L analyses performed on quarterly composites.
00IF analyses performed quarterly on a composite of weekly samples.
Page 4 of 6

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS Averages (mg/I)
Month         001D*          001G         001H           0011       001J        001K        001L        001M       001P       002       003 JAN            <5           ND(2)       DNQ(2)                                             ND(2)                    5      DNQ(2)       29 FEB            <5           ND(2)        ND(2)                                             ND(2)                   <5      DNQ(4)       11 MAR            <5           ND(2)        ND(2)                                           DNQ(2)                    21         <5    DNQ(4)
APR            <5          ND(2)         ND(2)                    ND(2)                    ND(2)       ND(2)       29          11       34 MAY            <5           ND(2)        ND(2)                                             ND(2)                 ND(2)        <5     ND(2)
JUN            <5           ND(2)        ND(2)                   DNQ(3)                    ND(2)                   14      DNQ(2)   DNQ(2)
JUL            <5          DNQ(2)        ND(2)                                             ND(2)      DNQ(2)     ND(2)      ND(2)   DNQ(4)
AUG            <5           ND(2)        ND(2)                                             ND(2)     DNQ(3)        11      DNQ(2)        7 SEP            <5           ND(2)        ND(2)                    ND(2)                    ND(2)      DNQ(2)    DNQ(4)     DNQ(2)        5 OCT            <5           ND(2)       DNQ(2)                    ND(2)                    ND(2)                 ND(2)     DNQ(2)       <5 NOV            <5           ND(2)        ND(2)                                             ND(2)                DNQ(2)      ND(2)        8 DEC            <5          DNQ(2)        ND(2)                                             ND(2)                 ND(2)     DNQ(2)   DNQ(2)
Limit:          30             30           30            30         30          30          30           30        30         30
* Discharges from 001D are batched. Monthly averages are flow weighted.
Note: No discharges occurred from 0011 and 001K during 2012.
Blank spots for other discharge points indicate that no discharge occurred during that particular month.
QUARTERLY GREASE & OIL Averages by Month (mg/I)
Month       001D*         001G         001H           0011        001J        001K       001L         001M       001P      002        003      004 JAN          <5.0        ND(1.4)      ND(1.4)                                           ND(I.4)                 ND(1.4)   ND(1.4)    ND(1.4)  ND(1.4)
FEB       DNQ(3.9)
MAR        ND(l.4)
APR          <5.0        ND(1.4)      ND(1.4)                    ND(1.4)                ND(1.4)      ND(I.4)    ND(1.4)   ND(1.4)    ND(1.4)  ND(1.4)
MAY       DNQ(2.1)
JUN       DNQ(2.7)
JUL          <5.0        ND(1.4)      ND(1.4)                                           ND(i.4)      ND(1.4)    ND(1.4)   ND(I.4)    ND(I.4)  ND(1.4)
AUG        ND(I.4)                                                                                   ND(1.4)
SEP         <5.0                                                ND(1.4)                             ND(I.4)
OCT          <5.0        ND(I.4)      ND(1.4)                    ND(1.4)                ND(1.4)                 ND(1.4)   ND(1.4)    ND(1.4)  ND(1.4)
NOV          <5.0                                                                       ND(1.4)
DEC          <5.0 Limit:      15            15           15            15           15          15         15           15        15        15         15       15
* Discharges from 001D are batched. Monthly averages are flow weighted.
Note: No discharges occurred from 0011 and 001K during 2012.
Page 5 of 6

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING (toxicity units, tua and tue)
ACUTE                       *CHRONIC Test    6-Month                      Test Month           Result     Median                    Result JAN FEB             0.00       0.00                       1.00 MAR APR              0.00       0.00                       1.00 MAY JUN JUL             0.00       0.00                       1.00 AUG SEP OCT              0.00       0.00                       1.00 NOV DEC 6-month median limit:       0.26                        5.1
* This parameter is monitored for the State Ocean Plan instead of the NPDES Permit. A value of 1.0 indicates no chronic toxicity.
DISCHARGE 001N ANNUAL ANALYSES Sludge Parameter                                Result                   Limit Percent Moisture                          99%                     None Total Kjeldahl Nitrogen                620 mg/I                   None Ammonia (N)                             58 mg/I                   None Nitrate (N)                             5.9 mg/I                  None Orthophosphate (as P)                   97 mg/I                   None pH                                         7.1                    None Oil and Grease                          11 mg/I                   None Boron                                   1.1 mg/I                  None Cadmium                                 9.0 ug/I              10 X STLC*
Copper                                 3500 ug/I               10 X STLC Chromium                             DNQ(37) ug/I              10 X STLC Lead                                     54 ug/I               10 X STLC Nickel                                   71 ug/I               10 X STLC Mercury                                  16 ug/I               10 X STLC Zinc                                   5000 ug/I               10 X STLC Volume                                 1.11 tons                  None Note: Annual samples were collected in October.
* STLC = Soluble Threshold Limit Concentration Page 6 of 6

Annual Discharge Monitoring Report APPENDIX 3 GRAPHICAL SUMMARIES OF INFLUENT AND EFFLUENT MONITORING

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Temperature(*F) 90.0 80.0 70.0 60.0 La.
 'a   50.0 42 40.0 30.0                                                             [7            High 20.0                                                                 - Average 10.0                                                                -- 4 --Low 0.0              iI                   ii                                    Ii JAN  FEB    MAR   APR    MAY     JUN       JUL AUG SEP   OCT         NOV            DEC 2012 DISCHARGE 001 EFFLUENT Temperature(*F) 90.0 80.0 70.0 60.0 L.
50.0 oc 40.0 30.0                                                                   -"      -  High 20.0                                                                   -.- 4..--- Average 10.0                                                                    -- 4--    Low 0.0 JAN   FEB    MAR    APR    MAY     JUN       JUL AUG SEP    OCT         NOV            DEC 2012 Page I of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flow (MGD) 3000 2500 U
2000 0
__ 1500 U
C, C. n Limi I5 SC
           +/-0                                                                   4--Average
                                                                             --     Low V-01    FiI           A                I               I   I    I    I      Lo JAN   FEB    MAR    APR    MAY     JUN        JUL  AUG  SEP OCT  NOV           DEC 2012 DISCHARGE 001 EFFLUENT Monthly Delta T (F) 25 20 U. 15 41 1 Lima High a-  Average 0
JAN     FEB    MAR    APR    MAY     JUN        JUL   AUG  SEP  OCT  NOV           DEC 2012 Page 2 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Total Chlorine Residual,ug/
100                                                                                               100   High 90                                                                                                  0- Average 8 0                                                                                               - -0 Lo w 70 60 "J   50 so 40 30 20 10 0
JAN       FEB         MAR       APR        MAY         JUN         JUL        AUG       SEP OCT       NOV  DEC 2012 Note: Values plotted at zero were below the reporting limit.
DISCHARGE 001 Total Chlorine Used, pounds per day 800                 High Average 700 Soo 500 4
Ca 2.
400 0
JAN       FEB          MAR       APR        MAY        JUN         JUL        AUG       SEP OCT        NOV DEC 2012 Note: The zero value in April was due to no chlorine system injections for one day.
Page 3 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper(monthly average, ugpi)                     ----      Permit Limit and Reporting Limit 12 10 Influent Effluent                              I 8
-J  6 4
2 0
DEC 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
The 6-month median limit (the most conservative limit) is plotted on this chart (this is also the analytical reporting limit).
The daily maximum limit for Copper is 50 ug/l.
DISCHARGE 001 Nickel (monthly average,ug/I) 35 -
30             : ~~     ,,O                    ,          ~WO
                                                               ,            -           -               .               m,             ,         ,
Discharge Permit Limit 25 -                                                                                                             Influent Effluent
                                                                                                          -- *--    Analytical Reporting Limit 20 +
-J 15  +
10 5"                                   .....
0 10       10         10         10          10          10           10          10             10               10            10          10 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
The 6-month median limit (the most conservative limit) is plotted on this chart.
The daily maximum limit for Nickel is 100 ug/l.
Page 4 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Zinc (monthly average,u9/I) 80 70 60                                                                                                 -  Discharge Permit Limit Influent 50                                                                                                    Effluent
 -,j                                                                                                        An41alyticluR~eporting Lim.*
 "* 40 30 20 10                                                           $
0 JAN       FEB       MAR         APR        MAY          JUN         JUL       AUG          SEP        OCT             NOV       DEC 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE 001 Chromium (monthly average, ug/i) 12 10 8
-6 4
2 0 AN-JAN        FEB       MAR         APR        MAY          JUN         JUL        AUG         SEP                                   DEC 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
The 6-month median limit is plotted on this chart. The daily maximum limit for chromium is 40 ug/L The discharge permit limit and the analytical reporting limit are the same (10 ug/I).
Page 5 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant 8.3 8.2 8.1    "
8.0 7.9 1-*
C. 7.8 -
7.7 7.6 7.5 7.4 7.3 JAN        FEB        MAR         APR         MAY        JUN          JUL      AUG          SEP          OCT           NOV   DEC 2012 Note: Several data points on this chart overlap.
Discharge 001 Ammonia (as N, ug/I) 3500 3000 2500                                                                                      ---    6-Month Median Limit Influent 2000
                                                                                                  ----   Effluent
   =    1500 1000 500 0
JAN       FEB      MAR        APR       MAY        JUN       JUL      AUG        SEP        OCT        NOV         DEC 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Influent and Effluent values overlap at three points on this plot.
Page 6 of.15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F Oil & Grease (Maximum, mg/I) 25.0 T 20.0 1 15.0t
                                                                                       -     Daily Maximum Limit E                                                                                      0     Monthly Average Limit 10.0   +                                                                        ---       Sample Result (Maximum) 4-    Analytical Reporting Limit 5.0 0.0  'I         p JAN        FEB       MAR         APR       MAY          JUN        JUL AUG     SEP            OCT           NOV        DEC 2012 Note: Values plotted at zero were below the detection limit.
DISCHARGE 001F Suspended Solids (Maximum, mg/I) 120 100
                                                                                           ---       Daily Maximum Limit 80                                                                                           Monthly Average Limit
                                                                                          -e--      Sample Result (Maximum) 60                                                                                    ----      Analytical Reporting Limit 2
40 20 0 *-f                =T      --     T JAN        FEB       MAR         APR        MAY         JUN        JUL                        OCT           NOV         DEC 2012 Note: Maximum values are plotted.
Page 7 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant a-Daily Maximum Limit DISCHARGE 001N                               ----       Monthly Average Limit Oil & Grease (mg/I)                            a     Daily Maximum
                                                                                                        -     Average 25 N     Analytical Reporting Limit 20 15 E 10 5
0I                      i            i                     I            i       T-       i                               i            I JAN       FEB        MAR         APR        MAY        JUN           JUL      AUG     SEP             OCT            NOV           DEC 2012 Note: Daily maximum and monthly average values overlap at seven points on this plot.
DISCHARGE 001N                                       i   - Monthly Average Limit Suspended Solids (mg/I)                                      Daily Maximum 100                                                                                                     ------ Average 90 80 70 601-
" 50 E 40 30 20 10 0
JAN       FEB       MAR          APR        MAY        JUN           JUL     AUG      SEP            OCT             NOV          DEC 2012 Note: There is no limit for daily maximum values. The average values are below monthly average limit.
DISCHARGE 001N Settleable Solids (mill) 3.5 3
2.5                                                                                                              Daily Maximum Limit 1.5                                                                                                             Average 10.
0.5 0    ,       &-         --           "-                    ""--                           '               "-                          -
JAN      FEB        MAR          APR       MAY        JUN           JUL      AUG     SEP             OCT            NOV           DEC 2012 Note: Values plotted at zero were below the detection limit.
High, average, and low values overlap at twelve points on this plot.
Page 8 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D                                            13Silver QuarterlyMetals (ugI)
* Cadmium 25                                                                                                       U Chromium
* Copper     I 20 15 10 5
0 JAN        FEB       MAR          APR        MAY         JUN         JUL         AUG         SEP    OCT        NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE 001D QuarterlyMetals (ug/l) 140 c~cel 120 Imlleadi 100 NZinci 80 60 40 20 0
JAN       FEB       MAR         APR        MAY        JUN        JUL         AUG         SEP    OCT       NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 9 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F QuarterlyMetals (ug/I) 250-o7iver 200 oCadmiumj U Chromium 150-100-50 0      I JAN       FEB      MAR        APR        MAY       JUN        JUL        AUG        SEP       OCT      NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE 001F QuarterlyMetals (ugfI) 50                                                                                                            [Mercury
                                                                                                                 " Nickel l Lead 40                                                                                                            EZinc 30 co 20 10          I 0-JAN       FEB        MAR         APR         MAY        JUN          JUL        AUG          SI                 NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 10 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001H QuarterlyMetals (ug,)
o7iver1 100
* Cadmium 90                                                                                                         U Chromnium 80                                                                                                         W~per          I 70 60 650 40 30 20 10 0
JAN       FEB        MAR         APR         MAY         JUN          JUL        AUG          SEP OCT       NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE 001H QuarterlyMetals (ug/l) 80 -
70 l--M..e_&#xfd;ickell' 60                                                                                                              lLeadi 50-
* 40 30 20-10 0
JAN        FEB        MAR         APR        MAY          JUN         JUL         AUG         SEP OCT        NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 11 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001L QuarterlyMetals (ug/i) 20  T 18   -
16 &#xfd;-
14                                                                                                            IUCadmlumI IuChromluml 12 +
c10 8 +
6 4
2 I
0 JAN        FEB       MAR         APR        MAY          JUN         JUL        AUG          SEP   OCT      NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
DISCHARGE 001 L QuarterlyMetals (ug/I) 14+
12 t 10  +
8
[mecrMercury ui
* Nickel 6
* Lead 4                                                                                                                 aZinc 2
0             I          I           I                      I[I                                         I                  !
JAN       FEB        MAR         APR        MAY          JUN         JUL        AUG         SEP    OCT      NOV 2012 Note: The analyte was not detected at or above the detection limit for values plotted at zero.
Page 12 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/I) 35 -
301 25                Montly verge      oimi 20 E 15 10 It I N
JAN       FEB         MAR        APR        MAY        JUN         JUL        AUG           SEP            OCT           NOV       DEC 2012 Note: Points on chart may overlap. Values plotted at zero were below the detection limit MONTHLY TOTAL SUSPENDED SOLIDS (Average, mgI) 35 30 25                                                                                                         0-   Monthly Average Limit 0011 20
                                                                                                           ---e - 0011-E 15                                                                                                     -        01M 00--
10 5
A 0
JAN       FEB         MAR        APR        MAY        JUN         JUL        AUG           SEP            OCT          NOV        DEC 2012 Note: Points on chart may overlap. Values plotted at zero were below the detection limit MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/I) 40 35 30                                                                                             =     Monthly Average Limit (001P& 002) 25                                                                                         -i--*-0iP 25 15 10 5
0 JAN       FEB         MAR        APR       MAY         JUN         JUL        AUG           SEP            OCT          NOV        DEC 2012 Note: Points on chart may overlap. Values plotted at zero were below the detection limit.
There is no limit for discharge 003. Therefore, the April 003 value of 34 does not exceed a limit.
Page 13 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY OIL & GREASE (Average, mg/I) 16 14 12                 001.
10 E o*8              -Monthly Average Limit 6
4 2
0 JAN       FEB       MAR         APR     MAY         JUN        JUL      AUG           SEP      OCT            NOV        DEC 2012 Note: Values plotted at zero were below the detection limit. Less than values are plotted at the value.
QUARTERLY OIL & GREASE (Average, mg/I) 16   T 14+
m     001J 12 +                                                                                                          001L 10                                                                                                        1001M N     Monthly Average Limit 8
E 6
4 2
0            I          I                   I          I           I              . .. l .. .  . .. I          I     ....
JAN      FEB        MAR         APR     MAY         JUN       JUL      AUG           SEP       OCT          NOV         DEC 2012 Note: Values plotted at zero were below the detection limit.
QUARTERLY OIL & GREASE (Average, mg/1) 16  T 14-
                                                                                                               -      GOIP 12 -                                                                                                        *002 10                                                                                                          m     003 E o*8                                                                                                        m        004 Monthly Average Limit 6
4 2
IIIII                                            I       I           I            I          I            I 0
JAN      FEB       MAR          APR     MAY         JUN       JUL      AUG           SEP       OCT          NOV         DEC 2012 Note: Values plotted at zero were below the detection limit.
Page 14 of 15

2012 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY (6-Month Median) 6.00 5.00  =
Chronic Bloassay Results 4.00                                                6-mo. Median Acute Limit
  ,3.00                                               -i-- Acute Bioassay Results
                                                      ---  Chronic Limit x 22.00                                               -4   Acute 6-month Median 0
JAN  FEB  MAR   APR   MAY    JUN      JUL AUG SEP    OCT     NOV      DEC 2012 Page IS of 15

Annual Discharge Monitoring Report APPENDIX 4

==SUMMARY==
OF RWMP MONITORING FOR 2012 RWMP         1st Survey       2nd Survey         3rd Survey        4th Survey Stations/    Completion        Completion        Completion        Completion Study Surveys        Stations/        Stations/          Stations/         Stations/
per Year         Dates            Dates              Dates             Dates Horizontal Band Transects    14/ 4x         Feb 17           Jun 07             Aug 31            Dec 24 Vertical Band Transects       5/ 4x         Feb 07           Jun 07             Aug 02            Dec 12 Benthic Stations              8 I 4x        Mar 09           Jun 28             Sep 11            Dec 11 Fish Observation Transects   12 I 4x        Apr 24           Jul 13              Oct 09       Jan 17, 2013 Bull Kelp Census              *1/x            n/a              n/a                 n/a            Oct 17 Temperature Monitoring       24/ **        Jan-Mar          Apr-Jun             Jul-Sep          Oct-Dec
* Diablo Cove census.
   ** Temperature measured throughout the year at 20 minute intervals (14 intertidal and 10 subtidal stations).
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