DCL-2014-509, Annual Report on Discharge Monitoring

Annual Report on Discharge Monitoring

ML14087A124
Person / Time
Site:	Diablo Canyon
Issue date:	02/28/2014
From:	Cortese K Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation, State of CA, Central Coast Regional Water Quality Control Bd
References
CA0003751, DCL-2014-509
Download: ML14087A124 (41)

Text

Pacific Gas and Electric Company PacificGas and Diablo Canyon Power Plant P.O. Box 56 !

1a Electric Company Avila Beach, CA 93424 PG&E Letter DCL-2014-509 Electronic Submission CIWQS Web Application February 28, 2014 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 2013 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 WDRINPDES Order Number: Order No. 90-09, NPDES No. CA0003751 Type of Report: (check one) QUARTERLY ANNUAL 0 []

Quarter: (check one): St nd 3 rd 0t 1 2 0 01 01 E0 Year: 2013 (Annual Reports for DCPP are Jan-Dec)

Violation(s) (Place an X by the appropriate choice): [KI No (there are no violations to report) [0 Yes Note: Reference 'Review of Compliance Record and Corrective Actions" Section

&~25

/d (~L

PG&E Letter DCL-2014-509 CRWQCB Central Coast Region February 28, 2014 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 LimitlCondition:

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-2014-509 CRWQCB Central Coast Region February 28, 2014 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 2014509jl1k/bkc

PG&E Letter DCL-2014-509 CRWQCB Central Coast Region February 28, 2014 Page 4 cc: Hardcopy Print-Out of CIWQS Application Submittal:

Thomas Hipschman Senior Resident Inspector U.S. Nuclear Regulatory Commission Diablo Canyon Power Plant 104/5 Regional Administrator U.S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001

CIWQS Web Application Submittal Print Out and Attached Supporting Documents eSMR PDF Report Summary: Annual SMR ( MONNPDES ) report for 2013 Summary: Annual SMR ( MONNPDES ) report for 2013 submitted by Kenneth Cortese (No Title) on 02/28/2014.

Facility Name: PG&E DIABLO CANYON POWER PLANT Order Number: R3-1990-0009 Waterboad Office: Region 3 - Central Coast Case Worker: Anthony Bonilla, Peter Von Langen Report Effective Dates: 01/01/2013 - 12/31/2013 No Discharge Periods Diablo M-001

-I d-t Diablo M-001D

4. +

Diablo M-OO1F

+ f -I-Diablo M-001G Diablo M-001H

)iablo M-0011 01101/2013 - 12/31/2013 Diablo M-001J Diablo M-OO1K 01/01/2013- 12/31/2013 Diablo M-001L Diablo M-001M Diablo M-001N Diablo M-001P Diablo M-002 Diablo M-003 Diablo M-004 Diablo M-005 Diablo M-008

)iablo M-009 Diablo M-013 Diablo M-015 Diablo M-016 01/01/2013 - 12/31/2013

)iablo M-017 01/01/2013 - 12/31/2013

)iablo M-INF Self-Determined Violations No Violations Entered Attachments Page 1 of 3

Attachment 1 - 2013 DCPP Annual Report Overview Section.pdf 02/28/2014 116384 bytes Attachment 2 - 2013 DCPP Annual Rpt Appendix-1 NPDES 02/28/2014 51524 bytes Discharge Points.pdf Attachment 3 - 2013 DCPP Annual Rpt Appendix-2 Tabular 02/28/2014 140601 bytes Summaries of Monitorinq.pdf Attachment 4 - 2013 DCPP Annual Rpt Appendix-3 Graphical 02/28/2014 492054 bytes Summaries of Monitorinq.pdf Attachment 5 - 2013 DCPP Annual Rpt Appendix-4 Summary of 02/28/2014 70147 bytes RWMP Monitoring.pdf Cover Letter (Uploaded File)

PGE DCL2014509 2013 NPDES Annual Discharge Monitoring Report.pdf 02/28/2014 717901 bytes Data Summary Analytical Results No Analytical Data Measurements Available / Reported Calculated Values No Calculated Data Measurements Available / Reported Certificate 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. I am aware that there are significant penalties for submitting false information, including the possibility of fine and 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 the following report(s):

- Annual SMR ( MONNPDES ) report for 2013 (due 02/28/2014)

I understand that data submitted In this report(s) can be used by authorized agencies for water quality management related analyses and enforcement actions, if required.

I am also aware that my user ID, password, and answer to a challenge question constitute my electronic signature and any Information I Page 2 of 3

Indicate I am electronically certifying contains my signature. I understand that my electronic signature Is the legal equivalent of my handwritten signature. 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 Page 3 of 3

ANNUAL

SUMMARY

REPORT ON DISCHARGE MONITORING AT THE DIABLO CANYON POWER PLANT (NPDES NO. CA0003751) 2013

PG&E Letter No. DCL-2014-509 2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant TABLE OF CONTENTS P.AGE 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

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 2013

2013 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 2013, discharges occurred from all discharge paths except 00 11, 001K, 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 I 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 2013.

005 non-detect - ND(1.4 mg/I) 008 non-detect - ND(1.4 mg/I) 009 non-detect - ND(1.4 mg/I) 013 7.5 mg/I 015 non-detect - ND(1.4 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 DNQ(0.048) mg/I, 277 mg/I, and ND(3) 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 Plant 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 2013 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 # CA01036)

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 Chlorination/Bromination Monitoring The 2013 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 were performed (as approved by the CCRWQCB January 13, 1994; PG&E Letter No. DCL-94-002).

Detailed descriptions of these evaluations are included in the respective quarterly reports. The evaluations concluded that discharge chlorine limits were not exceeded during these events.

Chlorination Cycle Date Monitoring Cause Corrective Action I Interruptions 1 1 05/02/13 to Unit 2 Sample tubing fouled with Sample tubing cleaned.

05/09/13 43 Readings biological growth. Sampletubingcleaned.

12/10/13 to Unit 2 Sample tubing union blocked Sample tubing cleaned.

12/11/13 4 Readings with bio-fouling debris.

12/19/13 Unit 1 Sample piping flow to monitor Upstream sample 2 Readings blocked by debris, piping back-flushed.

2Unit 12/30/13 1 &2 Sample piping maintenance Engineering evaluation only Readings inadvertently performed during completed.

chemical injection cycles. completed.

b. Closed Cooling Water Releases During 2013, 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 2013 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.

Date System Volume (gallons) Glut (mg/I) Iso (mgll) Total Suspended Oil & Reason &

Solids (mg/I) Grease Comments (mg/I) 01/09/2013 Unit 2 ICW 33,050 < 50 5.3 < 2.0 < 1.4 Routine Maintenance 02/20/2013 Unit 2 CCW 11,000 195 0.0 n/a n/a Routine Maintenance 03/02/2013 Unit 2 SCW 33,220 < 50 0.4 24.7 < 1.4 Routine Maintenance 03/06/2013 Unit 1 SCW 33,360 < 50 6.2 < 2.0 < 1.4 Routine Maintenance 04/17/13 Unit I ICW 12 < 50 3.0 n/a n/a Routine Maintenance 04/17/13 Unit 2 CCW 12 97 0.0 n/a n/a Routine Maintenance 05/23/13 Unit 2 CCW 3,100 151 0.0 < 2.0 < 1.4 Routine Maintenance 06/11/13 Unit 2 SCW 33,310 < 50 8.0 < 2.0 < 1.4 Routine Maintenance 07/08/13 Unit 1 ICW 12 0.0 7.6 n/a n/a Routine Maintenance 07/08/13 Unit 2 ICW 10 0.0 6.5 n/a n/a Routine Maintenance 07/21/13 Unit 2 ICW 10 0.0 6.2 n/a n/a Routine Maintenance 08/20/13 Unit 1 SCW 33,110 0.0 8.3 < 2.0 < 1.4 Routine Maintenance 11/04/13 Unit 2 ICW 3,309 0.0 8.6 n/a n/a Routine Maintenance 11/05/13 Unit 1 ICW 3,326 0.0 8.4 n/a n/a Routine Maintenance

c. Sample Analysis Issues

1. During the second quarter of 2013, an issue was identified that affected the accuracy of analysis for metals in the monthly samples from Discharge 001, and quarterly samples from the Intake. The identified issue impacts carried over into the third quarter. Compensatory actions included employing an ELAP-Certified vendor laboratory to analyze or re-analyze Intake and Discharge 001 samples for comparison of the results. The root cause of the issue was identified during method optimization that was performed with the assistance of a specialist from the instrument manufacturer. Methods and respective procedures were corrected to prevent recurrence. Vendor lab results were averaged with the Diablo Canyon laboratory analysis results for reporting during the period affected. The pertinent vendor laboratory reports were included as attachments in the appropriate quarterly reports. The analysis final values were all below the permit limits for the respective 6-month median results at Discharge 001, which are the most conservative.

d. Exceedances

1. On March 22, 2013, a 10-minute injection system test (test) of sodium hypochlorite (chlorine) and sodium bromide (bromine) was run on Unit 2 during a time period in which routinely scheduled seawater conduit chemical treatments do not occur. The system test was run during unit start-up activities at the end of the 2R 17 refueling outage, and immediately following return to service of circulating water pump 2-2. The activity was intended to verify acceptable residual oxidant (chlorine) concentrations at the Unit 2 discharge for conduits 2-1 and 2-2 combined outflow prior to resuming routine treatment cycles. The test injection was in addition to the routinely scheduled 6x20-minutes per unit/conduit daily treatment regime (Reference Section C.). Following a test injection, the subsequent routine treatment for the affected unit is typically skipped to ensure no more than 2-hours of conduit chemical injection is completed during a calendar day.

Following the test injection, the next routine chemical injection for Unit 2 was not skipped; which resulted in 2-hours and 10-minutes of conduit treatment for Unit 2 during the calendar day. This subsequently caused 2-hours and 10-minutes of detectable residual oxidant (chlorine) at the 3

Unit 2 outfall for the same calendar day. This exceeded the 2-hours per/day per/unit permit limit for 001 discharge residual chlorine. Exceedance of the detectable total residual chlorine (TRC) time-limit was discovered on March 23, 2013, and the Central Coast Regional Water Quality Control Board was subsequently notified via telephone message the same day. Exceedance of plant outfall residual chlorine concentration limits did not occur as a result of the event.

Immediate actions taken included verification the chemical injection systems was functioning normally, and exceedance of the 2-hour detectable chlorine limit for Unit 2 was not caused by system malfunction. System operability and functionality was confirmed satisfactory, and the incident cause determined to be an inadvertent system operator error. An enhanced operator guide was placed on the local control panel for the intake sodium hypochlorite and sodium bromide injection system to reduce the potential for recurrence of a similar unit conduit treatment error.

Additional procedural guidance for system operations was also developed and implemented.

2. On November 29, 2013, a value of 99-ppb for Total Residual Chlorine (TRC) was discovered on the Unit 1 outfall monitor for the 00:00 (midnight) chemical treatment cycle. The value resulted in an exceedence of the 89-ppb calculated Ocean Plan limit for TRC discharge during a 20-minute cooling water conduit chlorination treatment. The event was not an exceedence of the NPDES permit limit for TRC of 200-ppb. Regional Water Quality Control Board staff (von Langen) was notified via voice-mail message on the same day, within the 24-hour reporting requirement.

An event investigation indicated cause of the high Unit 1 residual chlorine was occlusion of an intake chemical treatment system pump skid injection line. Train-B of the intake injection system is used alternately to deliver bulk chlorine and bromine chemicals to the 1-2 (Unit 1) and 2-2 (Unit 2) cooling water conduits. The occlusion, identified in the 2-2 conduit injection line, resulted in accumulation of concentrated chemical in the shared upstream piping of pump skid Train-B, and subsequent inadequate freshwater flush of the piping following the 2-2 conduit chemical treatment conducted at 21:00 on 11/28/13. The accumulated chemical was then injected into the 1-2 conduit at the start of the midnight chemical treatment for Unit 1, resulting in an initial significant concentration of residual oxidant in the seawater conduit, and subsequent TRC spike at the Unit 1 outfall. System Train-B injections were shut down until the 2-2 line was evaluated and cleared.

Corrective actions included replacement of an in-line check valve found to be partially degraded, and cleaning of the chemical line terminal injection port found occluded with chemical precipitate.

e. Overflow Release

1. On August 8, 2013, it was discovered that the septic tank for plant site Building-123 was overflowing, and effluent had migrated across the adjacent roadway and down the embankment leading to the Plant Intake Cove. The flow of water was stopped when a running toilet found inside the building was subsequently shut-off. An estimate of 50-60 gallons of water may have reached the embankment leading to the Cove. The volume of water which may have migrated through the rip-rap armor placed on the embankment could not be estimated. It is likely however that all the water was completely absorbed by the dry soils and fill immediately adjacent the roadway and under the rip-rap.

Regional Water Quality Control Board staff were notified the morning the spill was discovered.

Overall, less than 1,000 gallons of water may have overflowed the septic tank before the running fixture was shut-off, most being absorbed into the soils and fill directly beneath and adjacent the building. The effluent released was primarily clean fresh water, as the septic tank had been emptied two days prior to the event, and the building has limited and infrequent use. The toilet was evaluated and parts replaced, and signs have been installed in the building's bathrooms to prompt users to check all water use fixtures after actuating to help reduce the potential for inadvertent run-ons to the septic tank. No NPDES limits were exceeded due to this event.

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f. Bypasses

1. On September 28, 2013, it was discovered that operation of the Unit 2 turbine building sump pump 2-2 was causing leak-off from the pump shaft casing to splash over into the clean side of the sump, releasing some wastewater overboard prior to normal routing through the oily water separator (OWS) system. This was an inadvertent partial bypass for pathway 001 F. Based on operator rounds and system monitoring, it is estimated that the splash over had occurred during sump pump operations for up to two days.

The sump system pumps routinely operate for approximately 20-minutes 3-times each operating shift, and the wastewater volume introduced into the clean-to-overboard compartment of the sump was estimated at approximately 1-gpm. Therefore, the maximum volume released overboard via the partial pathway bypass was estimated at 250-gallons. Following discovery of the issue, chemistry samples were taken, and pump 2-2 was shut-down pending troubleshooting and repair.

Sample analysis determined the effluent TSS was 38.8 mg/I and O&G was negative. Regional Water Quality Control Board staff were notified of the event the same day it was discovered.

Corrective actions included repair of a degraded pump discharge check valve that was contributing to a higher than normal leak-off rate from the pump shaft casing, and adjustment of the shaft casing pipe so that leak-off ports would not be directed toward the concrete partition which separates the clean side compartment of the sump from the dirty compartment. No NPDES limits were exceeded for pathway 001 F due to this event.

B. Monitoring of Receiving Water

1. Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2013 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 2013. Results of 2012 RWMP data were submitted to the CCRWQCB on April 27, 2013. A table in Appendix 4 summarizes requirements and completed monitoring tasks for 2013.

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 an integrated sodium bromide and "foul release coating" strategy to control macrofouling in the Circulating Water System (CWS). Both circulating water conduits of each Unit can be chemically treated simultaneously. The treatment program consists of six 20-minute injections (at 4-hour intervals) of a blend of generic sodium bromide and sodium hypochlorite into the plant 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 steam condensers. Discharge TRO, measured at the plant outfall, remained below NPDES limitations with except of a single equipment related incident that occurred in November (Reference Section A.4.d. exceedances Item 2). Typically, discharge TRO 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.

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Both conduits of Unit 1 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day throughout the first three quarters of 2013 with brief interruptions in January, February, March, April, June, and September for maintenance activities. The simultaneous treatment continued during the fourth quarter of 2013 with an interruption at the end of October for a scheduled seawater tunnel cleaning curtailment, and one additional brief interruption in December for scheduled maintenance activities. In addition, injections to the 1-2 conduit were secured in late November and early December due to operational concerns with the intake chemical system equipment (Reference Section A.4.d. exceedences Item 2).

Both conduits of Unit 2 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day through most of January with one brief interruption for maintenance activities. On January 22, 2013 sodium bromide was terminated in preparation for the 2R17 refueling outage, and at the end of January the remaining Unit 2 sodium hypochlorite injections were terminated. Simultaneous injections of sodium hypochlorite and sodium bromide were restored as each Unit 2 circulating water pump was restored to service near the end of 2R17 (after mid-March). There were brief interruptions in treatment near the end of March, June, July, September, and October for maintenance activities. In addition, injections to the 2-2 conduit were secured late November and early December due to operational concerns with the intake chemical system equipment (Reference Section A.4.d. exceedences Item 2).

D. Errata Two reporting errors have been identified in the electronic 4th quarter 2013 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

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 TEMPERATURE (DEG F) FLOW (MGD)

INFLUENT EFFLUENT DELTA T Month high low avE high low avl high avg high low avg JAN 55.7 51.8 53.5 73.9 70.1 71.8 18.4 18.3 2486 2486 2486 FEB 53.4 50.6 51.9 71.8 67.0 70.1 18.6 18.1 2486 1239 1347 MAR 54.0 50.1 51.4 72.4 61.4 68.2 18.6 16.8 2486 1239 1745 APR 54.9 48.8 51.0 75.1 67.0 69.3 18.4 18.3 2486 2486 2486 MAY 56.3 49.1 51.6 74.6 67.5 69.9 18.5 18.3 2486 2486 2486 JUN 56.2 49.2 52.0 75.1 61.1 69.5 18.9 17.4 2486 1896 2438 JUL 56.3 51.7 53.9 74.7 62.5 70.5 18.7 16.6 2486 1882 2440 AUG 55.8 53.1 54.2 74.7 71.7 72.8 19.0 18.6 2486 2486 2486 SEP 56.4 51.9 54.1 76.0 70.9 73.0 19.6 18.9 2486 2486 2486 OCT 57.8 53.3 56.3 77.0 72.5 75.5 19.5 19.2 2486 1874 2394 NOV 57.9 54.2 56.2 76.5 72.8 74.8 18.8 18.6 2486 1891 2446 DEC 58.4 53.6 55.4 77.2 72.3 74.3 19.3 18.8 2486 2486 2486 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 66 42 49 518 288 464 FEB 87 32 56 230 132 187 MAR 79 19 45 475 163 320 APR 50 <10 28 547 432 516 MAY 57 <10 35 648 418 569 JUN 41 14 28 576 197 464 JUL 43 <10 14 634 475 608 AUG 45 <10 22 720 634 689 SEP 45 16 29 763 634 707 OCT 29 <10 15 662 250 581 NOV 99 <10 24 706 504 645 DEC 50 <10 22 576 448 549 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.

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2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ug/I)

CHROMIUM COPPER NICKEL *ZINC Month Influent Effluent Influent Effluent Influent Effluent Influent Effluent JAN DNQ(7) DNQ(7) DNQ(6) DNQ(6) DNQ(9) DNQ(9) DNQ(7) ND(5)

FEB 11 10 ND(5) ND(5) DNQ(9) DNQ(8) ND(5) ND(5)

MAR 17 14 DNQ(7) DNQ(6) DNQ(8) DNQ(8) ND(5) ND(5)

APR <10 <10 <10 <10 <10 4 <10 <10 MAY <10 <10 <10 <10 <10 <10 <10 <10 JUN ND(5) ND(5) ND(5) ND(5) <10 DNQ(S) 4.9 36 JUL ND(5) ND(5) DNQ(6) DNQ(5) 10 DNQ(5) ND(5) DNQ(5)

AUG DNQ(S) ND(5) DNQ(4) DNQ(5) <10 DNQ(5) DNQ(5) DNQ(5)

SEP ND(5) DNQ(S) ND(5) ND(5) DNQ(5) DNQ(5) DNQ(5) ND(5)

OCT ND(5) ND(S) DNQ(9) DNQ(9) ND(5) ND(5) ND(5) ND(5)

NOV ND(5) ND(5) DNQ(6) DNQ(5) ND(5) ND(5) ND(5) ND(5)

DEC ND(5) ND(5) DNQ(7) DNQ(7) ND(5) ND(5) ND(5) ND(5) 6-month median limit: 10 - 10 30 70 Note: Influent results presented only for comparison to effluent Influent Cr, Cu, Ni, are analyzed monthly, but are only required to be reported quarterly by permit. Influent zinc is analyzed monthly and reported quarterly, but only required annually by permit.

DISCHARGE 001 VARIOUS ANNUAL ANALYSES (ug/) 6-Mo. Med.

Effluent Parameter Influent Effluent Limit Arsenic 1.29 1.31 30 Cadmium 0.033 0.032 10 Cyanide ND(3) ND(3) 30 Lead DNQ(0.010) ND(0.009) 10 Mercury DNQ(0.00027) DNQ(0.00023) 0.2 Silver ND(0.004) ND(0.004) 2.9 Titanium ND(0.4) ND(0.4) 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 8 target compounds. The sum of the 8 detection limits is 3.031.

• • Results for analysis of 6 target compounds. The sum of the 6 detection limits is 0.567.

• • • Detection limits shown are the sum of individual detection limits for 7 target compounds.

DISCHARGE 001 AMMONIA (as N) (ug/l)

Month Influent Effluent JAN DNQ(77) DNQ(62)

FEB MAR APR DNQ(91) DNQ(95)

MAY JUN JUL 260 240 AUG SEP OCT 250 320 NOV DEC 6-month median limit: 3,060 Page 2 of 6

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY pH (averages)

Discharge: 001 002 003 004 001P Month Influent Effluent JAN 7.8 7.9 7.9 7.7 7.7 7.7 FEB 7.9 7.8 8.1 7.9 8.4 7.6 MAR 7.7 7.7 7.8 7.8 7.7 7.5 APR 8.1 8.1 7.8 8.0 8.2 7.8 MAY 7.7 7.7 7.9 7.9 7.9 7.6 JUN 7.8 7.8 7.7 8.0 7.6 7.5 JUL 8.0 7.8 7.9 7.8 7.7 7.8 AUG 7.8 7.8 7.8 7.8 7.8 7.6 SEP 7.9 7.9 7.9 7.8 7.9 7.6 OCT 7.8 7.8 7.9 7.9 7.8 7.6 NOV 8.0 7.9 8.1 8.0 8.1 7.7 DEC 8.0 8.0 8.1 8.1 8.1 7.7 DISCHARGE 001F SUSPENDED GREASE & OIL (mg/I) SOLIDS (mg/I)

Month high avE high JAN av. ZZ3 ND(1.4) ND(1.4) DNQ(2) DNQ(2)

FEB ND(I.4) ND(I.4) DNQ(2) DNQ(2)

MAR ND(I.4) ND(I.4) DNQ(2) DNQ(2)

APR ND(I.4) ND(I.4) DNQ(2) DNQ(2)

MAY ND(1.4) ND(1.4) DNQ(2) DNQ(2)

JUN ND(I.4) ND(I.4) <5 <5 JUL ND(I.4) ND(I.4) DNQ(2) DNQ(2)

AUG ND(I.4) ND(I.4) DNQ(3) DNQ(3)

SEP <5.0 <5.0 10 10 OCT DNQ(2.1) DNQ(2.1) <5 <5 NOV ND(I.4) ND(1.4) ND(2) ND(2)

DEC NDQ1.4) ND(I.4) 5 5 limit: 20 15 100 30 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.

DISCHARGE OO1N (Monthly Summary of Weekly Data)

SUSPENDED SETTLEABLE GREASE & OIL (mg/i) SOLIDS (mg/i) SOLIDS (ml/I)

Month high low avz high low avE high low ave JAN 5.0 ND(I.4) <5.0 15 5 9 ND(0.1) ND(0.1) ND(0.1)

FEB 5.9 DNQ(I.8) <5.0 24 11 17 ND(0.1) ND(0.1) ND(0.1)

MAR <5.0 ND(I.4) <5.0 16 9 13 ND(0.1) ND(0.1) ND(O.1)

APR <5.0 ND(I.4) <5.0 15 ND(3) 8 ND(0.1) ND(0.1) ND(0.1)

MAY DNQ(4.2) ND(I.4) DNQ(2.5) 17 4 10 ND(0.1) ND(0.1) ND(0.1)

JUN DNQ(3.0) ND(I.4) DNQ(I.5) 22 5 14 ND(0.1) ND(0.1) ND(O.1)

JUL DNQ(I.5) ND(I.4) DNQ(I.4) 10 6 8 ND(0.1) ND(0.1) ND(0.1)

AUG ND(1.4) ND(I.4) ND(I.4) 21 6 12 ND(0.1) ND(0.1) ND(0.1)

SEP DNQ(1.5) ND(1.4) DNQ(I.4) 26 6 16 ND(0.1) ND(0.1) ND(0.1)

OCT DNQ(I.4) ND(I.4) DNQ(I.4) 18 4 9 DNQ(0.1) DNQ(0.1) DNQ(0.1)

NOV 18.7 ND(I.4) <5.0 16 6 11 DNQ(0.1) DNQ(0.1) DNQ(0.1)

DEC DNO(I.5) ND(0.72) DNO(O.72) 4 NDQ3) 3 DNO(0.1) DNO(0.1) DNO(0.1) 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

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D, H, L, F, METALS (avg. ug/l) 001D 00111 001L O0IF Month At Cd Cr Cu A 'Cd Cr Cu Az Cd Cr Cu At Cd Cr Cu JAN ND(5) ND(5) ND(5) 12 ND(5) ND(5) 46 44 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) DNQ(9) DNQ(9).

FEB MAR APR ND(5) ND(5) ND(5) DNQ(6) ND(5) ND(5) 15 36 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) DNQ(5) 12 MAY JUN JUL ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) 46 28 ND(5) ND(5) ND(5) ND(S) ND(5) ND(5) ND(5) 12 AUG SEP OCT ND(5) ND(5) ND(5) DNQ(6) ND(5) ND(5) 16 26 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) 13 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 Ha Ni Pb Zn Ha Ni Pb Zn Ha Ni Pb Zn Hg Ni Pb Zn JAN DNQ(0.079)DNQ(7) ND(5) 170 DNQ(0.13) 28 DNQ(5) 17 DNQ(0.11) ND(5) ND(5) ND(5) DNQ(0.12) 12 ND(5) 31 FEB MAR APR ND(O.050) ND(5) ND(5) 90 ND(O.050) 12 DNQ(5) DNQ(6) ND(0.050) ND(5) ND(5) ND(5) ND(O.050) I1 ND(5) 29 MAY JUN JUL DNQ(0.094) ND(5) ND(5) 33 ND(O.050) 21 <10 <10 ND(O.050) ND(5) ND(5) ND(5) ND(O.050) ND(5) ND(5) 29 AUG SEP OCT ND(O.050) ND(5) ND(5) 75 ND(0.050) 18 12 DNQ(7) ND(0.050) ND(5) ND(5) ND(5) ND(0.050) DNQ(7) 13 15 NOV DEC limit: none Note: 001D, 001H and 001L analyses perfornreed on quarterly composites.

00IF analyses performed quarterly on a com posite of weekly samples.

Page4 of 6

2013 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) ND(2) ND(2) ND(2) DNQ(3) DNQ(3)

FEB <5 DNQ(3) DNQ(3) ND(2) ND(2) DNQ(2) 7 5 MAR <5 DNQ(2) DNQ(2) ND(2) ND(2) 7 DNQ(3) 6 APR <5 ND(2) ND(2) ND(2) 18 DNQ(2) 5 MAY <5 ND(2) ND(2) ND(2) DNQ(2) DNQ(3) <5 JUN <5 ND(2) ND(2) ND(2) DNQ(3) <5 DNQ(2) DNQ(3)

JUL <5 ND(2) ND(2) ND(2) DNQ(3) DNQ(4) ND(2)

AUG <5 ND(2) ND(2) ND(2) <5 ND(2) DNQ(2)

SEP <5 ND(2) ND(2) ND(2) <5 DNQ(2) 6 OCT <5 ND(2) ND(2) ND(2) DNQ(2) DNQ(2) 17 NOV <5 ND(2) DNQ(2) ND(2) <5 <5 DNQ(3)

DEC <5 ND(2) ND(2) ND(2) ND(2) ND(2) 8 <5 .

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 2013.

Blank spots for other discharge points indicate that no discharge occurred during that particular month.

GREASE & OIL Averages by Month (mg/I)

Month 001D* 001G 001H 001I 001J 001K 001L 001M 001P 002 003 004 JAN <5.0 ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(I.4) ND(1.4) ND(I.4:

FEB DNQ(2.9) ND(1.4) ND(1.4)

MAR DNQ(3.9)

APR 5.9 ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(I.4:

MAY <5.0 ND(I.4)

JUN DNQ(1.7) ND(1.4)

JUL <5.0 ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(I.4; AUG <5.0 SEP DNQ(4.2)

OCT <5.0 ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4) ND(1.4:

NOV DNQ(4.7)

DEC ND(I.4) ND(1.4)

Limit: 15 15 15 15 15 15 15 15 15 15 15 15

• Discharges from 001D are batched. Averages are flow weighted and calculated and reported monthly, though only required quarterly.

Note: No discharges occurred from 0011 and 001K during 2013.

Page 5 of 6

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING (toxicity units, tu. and tuj ACUTE *CHRONIC Test 6-Month Test Month Result Median Result JAN 0.00 0.00 1.00 FEB MAR APR 0.00 0.00 1.00 MAY JUN JUL 0.00 0.00 1.00 AUG SEP OCT NOV DEC 0.00 0.00 1.00 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 n- ,1. I . .t arameter u In .

Percent Moisture 99% None Total Kjeldahl Nitrogen 37000 mg/kg None Ammonia (N) 6000 mg/kg None Nitrate (N) ND(180) None Total Phosphorous 25000 mg/kg None pH 7.3 None Oil and Grease ND(0.10) % None Boron 1500 mg/kg None Cadmium 1.0 mg/kg 10 X STLC*

Copper 350 mg/kg 10 X STLC Chromium 10 mg/kg 10 X STLC Lead 8.9 mg/kg 10 X STLC Nickel 11 mg/kg 10 X STLC Mercury 1.0 mg/kg 10 X STLC Zinc 760 mg/kg 10 X STLC Volume 75.41 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

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Temperature(*F) 90.0 T 80.0 +

70.0 60.0 k-- A 50.0 --- - I 0w

• p 40.0 30.0 20.0 + f--*-AverageI 10.0 --- Low I

0 .0 I I I i I I i I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 DISCHARGE 001 EFFLUENT Temperature (1F9 90.0 T 80.0 70.0 60.0 LL 50.0 0

a 30.0 + High 20.0 A 10.0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Page lofl5

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flow (MGD) 3000 2500 S2000 0

U

._ 1500 o 1000 ý Limit High 500 -- -- Average

- Low 0 I ii I I i i i I j I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 DISCHARGE 001 EFFLUENT Monthly Delta T (°F) 25 20 L. 15 2

o10 Limit High 5

--- 4-- Average 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Page 2 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 High Total ChlorineResidual, ug/1

~.~Average~

120 100 80 7a, 60 40 20 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001 Total ChlorineUsed, pounds per day Soo -- d High 800 --4-- Average 700 Soo 600

• 500 a.400 o 300 200 100 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Page3 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper(monthly average, ug/I) I - Permit Limit and Reporting Limit I Influent 12

-b EffluentI 10 8

-J 06 4

2 0

J AN FEB MAR APR MAY JUN JUL AUG 2013 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, ugl!)

35 301 W Discharge Permit Limit 25 --- Influent Effluent 20 + -- 4-- Analytical Reporting Limit

-J

15 10 W - - -

5 p p Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2013 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.

Page4 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Zinc (monthly average, ug/l) 80 70 -

60 ---- Discharge Permit Limit

--- Influent 50 ------ Effluent

,-J ----- Analytical Reporting Limit 40 30 20 100 0-*

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

DISCHARGE 001 Chromium (monthly average, ug/I) 18 6-Month Median and Analytical Reporting Limit 16 Influent 14 Effluent 12 10 -

8 6

J4A 0

JAN FEB MAR APR MAY 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

The 6-month median limit and the analytical reporting limit are the same (10 ug/I)and are plotted on this chart.

The daily maximum limit for chromium is 40 ug/h. February and March chromium results were affected by an analytical method issue described in Summary of Monitoring Program section A.4.c.1.

These results did not cause exceedances of the 6-month median limit or the daily maximum limit.

Page5of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant pH - 001 Influent

-- -- 001 Effluent 8.6 002 8.4 -- 003 004 8.2 8.0 7.8 7.6 7.4 7.2 7.0 -

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Several data points on this chart overlap.

Discharge 001 Ammonia (as N, ug/I) 3500 3000 - - - - - - - - 1111111 6-Month Median Limit 2500 Influent 2000 co Effluent

= 1500 1000 500 A ft JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 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.

Page6 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 F Oil & Grease (Maximum, mg/I) 25.0 T 20.0 15.0t Daily Maximum Limit E --- Monthly Average Limit 10.0 + ---.- Sample Result (Maximum)

--- Analytical Reporting Limit 5.0 onf iltll:: lII q JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Values plotted at zero were below the detection limit.

DISCHARGE 001F Suspended Solids (Maximum, mg/I) 120 100

---

Daily Maximum Limit I 80 -- Monthly Average Limit

--- Sample Result (Maximum) a 60 - Analytical Reporting Umit L " " - I E

40 20 0 3F F " " T[* v JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Maximum values are plotted.

Page 7 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant

--- Dally Maximum Limit DISCHARGE 001N Monthly Average Limit Oil & Grease(mg/I) _ Daily Maximum

--- Average 25 Analytical Reporting Limit 20 15 E 10 5

0 -

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Daily maximum and monthly average values overlap at eight points on this plot.

Monthly Average Limit DISCHARGE 001N Suspended Solids (mg/I) Dally Maximum 70 Average 60 50 S40 E 30 20 .

10 n-I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: There is no limit for daily maximum values. The average values are below the monthly average limit.

DISCHARGE 001N Settleable Solids (ml) 3.5 3:

2.5 Daily Maximum Limit 2 - - Monthly Average Limit Dally Maximum E 1.5 Average 1 C 0.5 0 p p p p p JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Values plotted at zero were below the detection limit.

High, average, and low values overlap at twelve points on this plot.

Page8of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D a7lier QuarterlyMetals (ug/l) lECadm~umI 25 MChromiurI 20 15 10 5

0-JAN*1 FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

DISCHARGE 001D QuarterlyMetals (ug/l) 180 160 ImLeadi 140 WZ~nci 120 w~rurJ

- 100 80 60 40 20 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

Page 9 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F 10 QuarterlyMetals (ug/I) 9 8 1Silver 0 Cadmium 7 UChromium 6

• Copper CA6 4

3 2

I 0 -  !  ! I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

DISCHARGE 001F Quarterly Metals (ugil) 50 a Mercury n Nickel ELead 40 7iInc 30 20 10 0jl JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

Page lOof15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001H QuarterlyMetals (ug/h) 13Silver 50

• Cadmium 45 WChromium a Copper 40 35 30 m25 20 15 10 5

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

DISCHARGE 001H QuarterlyMetals (ugIl) 30 T 25 + NNickel

• Lead

• Zinc 20 +-

I 15 t° 10 0 -

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

Page11 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001L QuarterlyMetals (ug/I) 20 18 16 14 - lacadmiumi 12 + IUChromluml 8

6 4

2 0 I I I I I I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

DISCHARGE 001L QuarterlyMetals (ug/l) 14 +

12 +

10 +

0) 6- ImNickell ELeadi 4

2 0 I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: The analyte was not detected at or above the detection limit for values plotted at zero.

Page12 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/I) 35 -

30 25 - -Montdy Average mt 0O01D 20 -,-4-,-001G0 E 1s 10 5

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Points on chart may overlap. Values plotted at zero were below the detection limit.

MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg1i) 35 30 25 -- Monthly Average Lim

--- 001i 20 0E E 15 -- 4--- 001 L 10 5

0 9 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Points on chart may overlap. Values plotted at zero were below the detection limit.

MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/I) 35 30 25 c 20 E 15 10 5

0 2013 Note: Points on chart may overlap. Values plotted at zero were below the detection limit.

Page 13 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY OIL & GREASE (Average, mg/I) 16 14 12 1 001 S8 -- 1-- Monthly Average Umit 6

4 2

0 L JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 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 14 12 10 1 O01M

• Monthly Average Limit 8

E 6

4 2

0 . - - I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Values plotted at zero were below the detection limit.

QUARTERLY OIL & GREASE (Average, mg/I) 16 14 12 002 10 o003 E 66 Monthly Average Limit 4

2 0 I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Note: Values plotted at zero were below the detection limit.

Page 14 of 15

2013 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY (6-Month Median) 6.00 5.00 Chronic Bioassay Results E4.00

--0-- 6-mo. Median Acute Limit Acute Bioassay Results

.>,3.00 Chronic Limit

'R 2.00 Acute 6-month Median 0

'"1.00 0.00 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2013 Page 15 of 15

Annual Discharge Monitoring Report APPENDIX 4

SUMMARY

OF RWMP MONITORING FOR 2013 RWMP 1st Survey 2nd Survey 3rd Survey 4th Survey Study Stations/ Completion Completion Completion Completion Surveys Stations/ Stations/ Stations/ Stations/

per Year Dates Dates Dates Dates Horizontal Band Transects 14 / 4x Mar 08 Jun 13 Sep 18 Dec 16 Vertical Band Transects 5 I 4x Feb 08 May 29 Aug 21 Dec 06 Benthic Stations 8 I 4x Mar 19 May 10 Aug 28 Nov 25 Fish Observation Transects 12 / 4x Mar 29 Jun 25 Sep 11 Dec 09 Bull Kelp Census */lx 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).