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

NPDES Permit No. CA0003751 - Annual Data Summary Tables and Plots Are Attached to the Ciwqs Application Submittal.

ML13079A068
Person / Time
Site:	Diablo Canyon
Issue date:	02/27/2013
From:	Cortese K Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation, State of CA, Regional Water Quality Control Bd
References
CA0003751, DCL-2013-506
Download: ML13079A068 (39)

Text

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.

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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.

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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.

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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.

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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.

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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_ýickell' 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 ý-

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).

'A