ML14087A124

Diablo Canyon, Units 1 and 2, 2013 Annual Report on Discharge Monitoring

ML14087A124
Person / Time
Site:	Diablo Canyon
Issue date:	02/28/2014
From:	Cortese K W 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 and1a Electric CompanyPG&E Letter DCL-2014-509 February 28, 2014Pacific Gas and Electric CompanyDiablo Canyon Power PlantP.O. Box 56 !Avila Beach, CA 93424Electronic Submission CIWQS Web Application California Regional Water Quality Control BoardCentral Coast RegionAttn: Monitoring and Reporting Review Section895 Aerovista, Suite #101San Luis Obispo, CA 93401-7906 In accordance with Order 90-09, NPDES No. CA0003751, the 2013 Annual Report onDischarge 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 PlantP.O. Box 56Avila Beach, CA 93424Address:Contact Person:Job Title:Phone Number:WDRINPDES Order Number:Type of Report: (check one)Quarter:

(check one):Bryan K. Cunningham Supervisor, Environmental Operations (805) 545-4439Order No. 90-09, NPDES No. CA0003751 QUARTERLY 0ANNUAL[]1St02nd013rd010tE0Year:2013 (Annual Reports for DCPP are Jan-Dec)Violation(s)

(Place an X by theappropriate choice):[KI No (there are no violations to report)Note: Reference

'Review of Compliance Record and Corrective Actions" Section[0 Yes&~25/d (~L PG&E Letter DCL-2014-509 CRWQCB Central Coast RegionFebruary 28, 2014Page 2If 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):

(attach additional information asneeded)g) Corrective Action(s):

(attach additional information asneeded)(If "YES", see overview section of attached report)(If "YES", see overview section of attached report)

PG&E Letter DCL-2014-509 CRWQCB Central Coast RegionFebruary 28, 2014Page 3I certify under penalty of law that this document and all attachments were prepared under mydirection 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 orpersons who manage the system, or those persons directly responsible for gathering theinformation, 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 observedresults of the measurements and analyses required by the monitoring

program, and is neitheran 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 aresignificant penalties for submitting false information, including the possibility of fine andimprisonment for knowing violations.

If you have any questions or concerns, or require additional information, please contact BryanCunningham at (805) 545-4439.

Sincerely, Name: Kenneth W. CorteseTitle: Manager, Chemistry and Environmental Operations

-Diablo Canyon Power Plant2014509jl1k/bkc PG&E Letter DCL-2014-509 CRWQCB Central Coast RegionFebruary 28, 2014Page 4cc: Hardcopy Print-Out of CIWQS Application Submittal:

Thomas Hipschman Senior Resident Inspector U.S. Nuclear Regulatory Commission Diablo Canyon Power Plant 104/5Regional Administrator U.S. Nuclear Regulatory Commission Region IV612 E. Lamar Blvd., Suite 400Arlington, TX 76011-4125 U.S. Nuclear Regulatory Commission Document Control DeskWashington, D.C. 20555-0001 CIWQS Web Application Submittal Print Out and Attached Supporting Documents eSMR PDF ReportSummary:

Annual SMR ( MONNPDES

) report for 2013Summary:

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 LangenReport Effective Dates: 01/01/2013

-12/31/2013 No Discharge Periods-I d-tDiablo M-001Diablo M-001D4. +Diablo M-OO1F+ f -I-Diablo M-001GDiablo M-001H)iablo M-0011 01101/2013

-12/31/2013 Diablo M-001JDiablo M-OO1K 01/01/2013-12/31/2013 Diablo M-001LDiablo M-001MDiablo M-001NDiablo M-001PDiablo M-002Diablo M-003Diablo M-004Diablo M-005Diablo M-008)iablo M-009Diablo M-013Diablo M-015Diablo M-016 01/01/2013

-12/31/2013

)iablo M-017 01/01/2013

-12/31/2013

)iablo M-INFSelf-Determined Violations No Violations EnteredAttachments Page 1 of 3 Attachment 1 -2013 DCPP Annual Report Overview Section.pdf 02/28/2014 116384 bytesAttachment 2 -2013 DCPP Annual Rpt Appendix-1 NPDES 02/28/2014 51524 bytesDischarge Points.pdf Attachment 3 -2013 DCPP Annual Rpt Appendix-2 Tabular 02/28/2014 140601 bytesSummaries of Monitorinq.pdf Attachment 4 -2013 DCPP Annual Rpt Appendix-3 Graphical 02/28/2014 492054 bytesSummaries of Monitorinq.pdf Attachment 5 -2013 DCPP Annual Rpt Appendix-4 Summary of 02/28/2014 70147 bytesRWMP Monitoring.pdf Cover Letter (Uploaded File)PGE DCL2014509 2013 NPDES Annual Discharge Monitoring Report.pdf 02/28/2014 717901 bytesData SummaryAnalytical ResultsNo Analytical Data Measurements Available

/ ReportedCalculated ValuesNo Calculated Data Measurements Available

/ ReportedCertificate I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with asystem designed to assure that qualified personnel properly gather and evaluate the information submitted.

Based on my inquiry of theperson 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 falseinformation, 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 andenforcement

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 IPage 2 of 3 Indicate I am electronically certifying contains my signature.

I understand that my electronic signature Is the legal equivalent of myhandwritten signature.

I certify that I have not violated any term In my Electronic Signature Agreement and that I am otherwise without anyreason to believe that the confidentiality of my password and challenge question answers have been compromised now or at any time prior tothis submission.

I understand that this attestation of fact pertains to the implementation, oversight, and enforcement of a federalenvironmental program and must be true to the best of my knowledge.

Name: Kenneth CorteseTitle: No TitlePage 3 of 3 ANNUAL SUMMARY REPORT ONDISCHARGE MONITORING AT THEDIABLO CANYON POWER PLANT(NPDES NO. CA0003751) 2013 PG&E Letter No. DCL-2014-509 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantTABLE OF CONTENTSP.OVERVIEWSUMMARY OF MONITORING PROGRAMA. Monitoring of Plant Influent and Effluent1. Monitoring Data2. Facility Operating and Maintenance Manual3. Laboratories Used to Monitor Compliance

4. Review of Compliance Record and Corrective ActionsB. Monitoring of Receiving Water1. Ecological Studies at Diablo Canyon2. In-Situ BioassayC. Sodium Bromide Treatment ProgramD. ErrataAPPENDICES Appendix 1 -NPDES Discharge PointsAppendix 2 -Tabular Summaries of Influent and Effluent Monitoring Appendix 3 -Graphical Summaries of Influent and Effluent Monitoring Appendix 4 -Summary of RWMP Monitoring for 2013AGE11112255555 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantOVERVIEWThis annual summary report follows the format used in quarterly monitoring reports.

Analytical results belowthe respective analytical detection limit (ND or non-detect) are plotted as a "zero" value in accordance withELAP guidance.

Results between the analytical detection limit and reporting (quantitation) limits are plotted atthe value and shown as 'DNQ' in the tabular summaries as is done for CIWQS reports.

Less-than results aretypically 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 alldischarge 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 inthe permit renewal application and application updates for Diablo Canyon Power Plant (DCPP) submitted inOctober 1994, January 2001, and April 2011. There have been no changes in activities conducted at the plantthat would have significantly affected the results previously reported in the above referenced documents.

SUMMARY OF MONITORING PROGRAMA. Monitoring of Plant Influent and Effluent1. Monitoring Dataa. Appendix I provides a list of discharge path names for ease of reference.

Appendix 2 containsmonitoring 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 samplequantities 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/I015 non-detect

-ND(1.4 mg/I)c. In October, Discharge 001D (Liquid Radioactive Waste Treatment System) annual grab samples forlithium, boron, and hydrazine were collected and analyzed.

The results were DNQ(0.048) mg/I, 277mg/I, and ND(3) mg/I, respectively.

2. Facility Operating and Maintenance ManualPacific Gas and Electric Company (PG&E) maintains a multiple volume Plant Manual at DCPP thatcontains 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.

Thefacility 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, andcomplete for the facility.

1

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 Actionsa. Circulating Water Chlorination/Bromination Monitoring The 2013 quarterly NPDES reports discuss chlorination cycles when discharge monitoring wasinterrupted.

These events are listed below, with brief descriptions of the cause and respective corrective action. When these monitoring interruptions

occurred, engineering evaluations wereperformed (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.

Theevaluations concluded that discharge chlorine limits were not exceeded during these events.Chlorination CycleDate Monitoring Cause Corrective ActionI Interruptions 1 105/02/13 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 sample2 Readings blocked by debris, piping back-flushed.

Unit 1 & 2 Sample piping maintenance Engineering evaluation only12/30/13 2 Readings inadvertently performed during completed.

chemical injection cycles. completed.

b. Closed Cooling Water ReleasesDuring 2013, maintenance activities that required draining of closed cooling water systems wereperformed, and are summarized below. PG&E received concurrence from the CCRWQCB inresponse 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 andisothiazolin to control microbiological growth and corrosion in DCPP's freshwater closed cooling watersystems.

Any drainage from these systems is discharged at a flow-rate such that the chronic toxicitylevel is below the "No Observable Effect Concentration" (NOEC) at NPDES Discharge 001.2 The volumes of cooling water drained in 2013 from the component cooling water (CCW), servicecooling water (SCW), and intake cooling water (ICW) systems are presented below. Theglutaraldehyde (Glut) and isothiazoline (Iso) concentrations presented in the table are systemconcentrations, not concentrations at the point of discharge to receiving water.Volume Glut Iso Total Oil & Reason &Date System (gallons)

(mg/I) (mgll) Suspended Grease CommentsSolids (mg/I) (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 Issues1. During the second quarter of 2013, an issue was identified that affected the accuracy of analysisfor metals in the monthly samples from Discharge 001, and quarterly samples from the Intake. Theidentified issue impacts carried over into the third quarter.

Compensatory actions includedemploying an ELAP-Certified vendor laboratory to analyze or re-analyze Intake and Discharge 001samples for comparison of the results.

The root cause of the issue was identified during methodoptimization that was performed with the assistance of a specialist from the instrument manufacturer.

Methods and respective procedures were corrected to prevent recurrence.

Vendorlab results were averaged with the Diablo Canyon laboratory analysis results for reporting duringthe period affected.

The pertinent vendor laboratory reports were included as attachments in theappropriate quarterly reports.

The analysis final values were all below the permit limits for therespective 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) andsodium 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-upactivities at the end of the 2R 17 refueling outage, and immediately following return to service ofcirculating 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 toresuming 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 testinjection, the subsequent routine treatment for the affected unit is typically skipped to ensure nomore 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; whichresulted in 2-hours and 10-minutes of conduit treatment for Unit 2 during the calendar day. Thissubsequently caused 2-hours and 10-minutes of detectable residual oxidant (chlorine) at the3 Unit 2 outfall for the same calendar day. This exceeded the 2-hours per/day per/unit permit limitfor 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 QualityControl Board was subsequently notified via telephone message the same day. Exceedance ofplant 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 bysystem malfunction.

System operability and functionality was confirmed satisfactory, and theincident cause determined to be an inadvertent system operator error. An enhanced operatorguide was placed on the local control panel for the intake sodium hypochlorite and sodium bromideinjection 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 onthe Unit 1 outfall monitor for the 00:00 (midnight) chemical treatment cycle. The value resulted inan 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 NPDESpermit limit for TRC of 200-ppb.

Regional Water Quality Control Board staff (von Langen) wasnotified 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 anintake chemical treatment system pump skid injection line. Train-B of the intake injection system isused 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 inaccumulation of concentrated chemical in the shared upstream piping of pump skid Train-B, andsubsequent 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 conduitat 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 1outfall.

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 Release1. On August 8, 2013, it was discovered that the septic tank for plant site Building-123 wasoverflowing, 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 insidethe building was subsequently shut-off.

An estimate of 50-60 gallons of water may have reachedthe embankment leading to the Cove. The volume of water which may have migrated through therip-rap armor placed on the embankment could not be estimated.

It is likely however that all thewater was completely absorbed by the dry soils and fill immediately adjacent the roadway andunder 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 runningfixture was shut-off, most being absorbed into the soils and fill directly beneath and adjacent thebuilding.

The effluent released was primarily clean fresh water, as the septic tank had beenemptied two days prior to the event, and the building has limited and infrequent use. The toilet wasevaluated and parts replaced, and signs have been installed in the building's bathrooms to promptusers 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.4

f. Bypasses1. On September 28, 2013, it was discovered that operation of the Unit 2 turbine building sump pump2-2 was causing leak-off from the pump shaft casing to splash over into the clean side of thesump, releasing some wastewater overboard prior to normal routing through the oily waterseparator (OWS) system. This was an inadvertent partial bypass for pathway 001 F. Based onoperator rounds and system monitoring, it is estimated that the splash over had occurred duringsump 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 sumpwas estimated at approximately 1-gpm. Therefore, the maximum volume released overboard viathe 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.

RegionalWater 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 shaftcasing pipe so that leak-off ports would not be directed toward the concrete partition whichseparates the clean side compartment of the sump from the dirty compartment.

No NPDES limitswere exceeded for pathway 001 F due to this event.B. Monitoring of Receiving Water1. Ecological Studies at Diablo CanyonMarine 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 EffectsMonitoring Program (TEMP). Several one-year-only tasks outlined in the above letters were completed in1999 and were not requested to be performed in 2013. Results of 2012 RWMP data were submitted to theCCRWQCB on April 27, 2013. A table in Appendix 4 summarizes requirements and completed monitoring tasks for 2013.2. In Situ BioassayResults 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 ProgramDCPP continued an integrated sodium bromide and "foul release coating" strategy to control macrofouling inthe Circulating Water System (CWS). Both circulating water conduits of each Unit can be chemically treatedsimultaneously.

The treatment program consists of six 20-minute injections (at 4-hour intervals) of a blend ofgeneric 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 theinlet waterbox of the main steam condensers.

Discharge TRO, measured at the plant outfall, remained belowNPDES 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. Inconjunction 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.

5 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 fourthquarter 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 theintake 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 Januarythe remaining Unit 2 sodium hypochlorite injections were terminated.

Simultaneous injections of sodiumhypochlorite and sodium bromide were restored as each Unit 2 circulating water pump was restored to servicenear 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 weresecured late November and early December due to operational concerns with the intake chemical systemequipment (Reference Section A.4.d. exceedences Item 2).D. ErrataTwo 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.6 Annual Discharge Monitoring ReportAPPENDIX IDIABLO CANYON POWER PLANTNPDES DISCHARGE POINTSDISCHARGE NUMBER DESCRIPTION 001 Once-Though Cooling Water001 A Firewater Systems001 B Auxiliary Salt Water Cooling System001 C Discharge Deleted001 D Liquid Radioactive WasteTreatment System001 E Service Cooling Water System001 F Turbine Building Sump001 G Make-Up Water System WasteEffluent001 H Condensate Demineralizer Regenerant 001 I Seawater Evaporator Blowdown001 J Condensate Pumps Discharge Header Overboard 001 K Condenser Tube Sheet LeakDetection Dump Tank Overboard 001 L Steam Generator Blowdown001 M Wastewater Holding and Treatment System001 N Sanitary Wastewater Treatment System001 P Seawater Reverse Osmosis SystemBlowdown002 Intake Structure Building FloorDrains003 Intake Screen Wash004 Bio Lab and Storm Water Runoff005, 008, 009, 013, 014, 015 Yard Storm Drains006, 007, 010, 011, 012 Storm Water Runoff016 Bio Lab Seawater Supply PumpValve Drain017 Seawater Reverse Osmosis SystemBlowdown Drain Annual Discharge Monitoring ReportAPPENDIX 2TABULAR SUMMARIES OF INFLUENT AND EFFLUENT MONITORING 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001TEMPERATURE (DEG F)EFFLUENTFLOW (MGD)INFLUENTDELTA TMonth high low avE high low avl high avg high low avgJAN 55.7 51.8 53.5 73.9 70.1 71.8 18.4 18.3 2486 2486 2486FEB 53.4 50.6 51.9 71.8 67.0 70.1 18.6 18.1 2486 1239 1347MAR 54.0 50.1 51.4 72.4 61.4 68.2 18.6 16.8 2486 1239 1745APR 54.9 48.8 51.0 75.1 67.0 69.3 18.4 18.3 2486 2486 2486MAY 56.3 49.1 51.6 74.6 67.5 69.9 18.5 18.3 2486 2486 2486JUN 56.2 49.2 52.0 75.1 61.1 69.5 18.9 17.4 2486 1896 2438JUL 56.3 51.7 53.9 74.7 62.5 70.5 18.7 16.6 2486 1882 2440AUG 55.8 53.1 54.2 74.7 71.7 72.8 19.0 18.6 2486 2486 2486SEP 56.4 51.9 54.1 76.0 70.9 73.0 19.6 18.9 2486 2486 2486OCT 57.8 53.3 56.3 77.0 72.5 75.5 19.5 19.2 2486 1874 2394NOV 57.9 54.2 56.2 76.5 72.8 74.8 18.8 18.6 2486 1891 2446DEC 58.4 53.6 55.4 77.2 72.3 74.3 19.3 18.8 2486 2486 2486limit: -22 2760The Influent and Effluent "high" and "low" temperture values correspond to the highest and lowest daily average value for that month. The Influent highand low temperature does not necessarily correspond to the same day as the Effluent high and low temperature for that month. The "avg" temperature forInfluent 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 averageInfluent and Effluent temperature values. The "avg" temperature is calculated from Influent and Effluent monthly avg values.DISCHARGE 001TOTAL RESIDUALCHLORINE (daily max. ug/I)TOTAL CHLORINEUSED (lbs/day)

Month high low avg high low avgJAN 66 42 49 518 288 464FEB 87 32 56 230 132 187MAR 79 19 45 475 163 320APR 50 <10 28 547 432 516MAY 57 <10 35 648 418 569JUN 41 14 28 576 197 464JUL 43 <10 14 634 475 608AUG 45 <10 22 720 634 689SEP 45 16 29 763 634 707OCT 29 <10 15 662 250 581NOV 99 <10 24 706 504 645DEC 50 <10 22 576 448 549Note: The residual chlorine limits in Permit CA0003751, Order 90-09, is an instantaneous max of 200 ug/l, andincludes a time-based limit (per the Ocean Plan) which depends on the length of the respective chlorination cycle.Page I of 6 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001CHROMIUMMETALS (monthly avg. ug/I)COPPERNICKEL*ZINCMonth Influent Effluent Influent Effluent Influent Effluent Influent EffluentJAN 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 <10MAY <10 <10 <10 <10 <10 <10 <10 <10JUN ND(5) ND(5) ND(5) ND(5) <10 DNQ(S) 4.9 36JUL 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 70Note: Influent results presented only for comparison to effluent Influent Cr, Cu, Ni, are analyzed

monthly, but are only required tobe reported quarterly by permit. Influent zinc is analyzed monthly and reported quarterly, but only required annually by permit.DISCHARGE 001VARIOUS ANNUAL ANALYSES(ug/)6-Mo. Med.EffluentParameter Influent Effluent LimitArsenic 1.29 1.31 30Cadmium 0.033 0.032 10Cyanide ND(3) ND(3) 30Lead DNQ(0.010)

ND(0.009) 10Mercury DNQ(0.00027)

DNQ(0.00023) 0.2Silver ND(0.004)

ND(0.004) 2.9Titanium 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 001AMMONIA (as N) (ug/l)Month Influent EffluentJAN DNQ(77) DNQ(62)FEBMARAPR DNQ(91) DNQ(95)MAYJUNJUL 260 240AUGSEPOCT 250 320NOVDEC6-month median limit: 3,060Page 2 of 6 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantMONTHLY pH (averages)

Discharge:

001 002 003 004 001PMonth Influent EffluentJAN 7.8 7.9 7.9 7.7 7.7 7.7FEB 7.9 7.8 8.1 7.9 8.4 7.6MAR 7.7 7.7 7.8 7.8 7.7 7.5APR 8.1 8.1 7.8 8.0 8.2 7.8MAY 7.7 7.7 7.9 7.9 7.9 7.6JUN 7.8 7.8 7.7 8.0 7.6 7.5JUL 8.0 7.8 7.9 7.8 7.7 7.8AUG 7.8 7.8 7.8 7.8 7.8 7.6SEP 7.9 7.9 7.9 7.8 7.9 7.6OCT 7.8 7.8 7.9 7.9 7.8 7.6NOV 8.0 7.9 8.1 8.0 8.1 7.7DEC 8.0 8.0 8.1 8.1 8.1 7.7DISCHARGE 001FSUSPENDED SOLIDS (mg/I)MonthJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEClimit:GREASE & OIL (mg/I)high avEND(1.4) ND(1.4)ND(I.4) ND(I.4)ND(I.4) ND(I.4)ND(I.4) ND(I.4)ND(1.4) ND(1.4)ND(I.4) ND(I.4)ND(I.4) ND(I.4)ND(I.4) ND(I.4)<5.0 <5.0DNQ(2.1)

DNQ(2.1)ND(I.4) ND(1.4)NDQ1.4) ND(I.4)20 15highDNQ(2)DNQ(2)DNQ(2)DNQ(2)DNQ(2)<5DNQ(2)DNQ(3)10<5ND(2)5100av.DNQ(2)DNQ(2)DNQ(2)DNQ(2)DNQ(2)<5DNQ(2)DNQ(3)10<5ND(2)530ZZ3Note: "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 aveJAN 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 -1.0Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.Page 3 of 6 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001D, H, L, F, METALS (avg. ug/l)001D 00111 001L O0IFMonth At Cd Cr Cu A ' Cd Cr Cu Az Cd Cr Cu At Cd Cr CuJAN 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).FEBMARAPR 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) 12MAYJUNJUL 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) 12AUGSEPOCT 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) 13NOVDEClimit: noneNote: 001D, 001H and 001L analyses performed on quarterly composites.

00IF analyses performed quarterly on a composite of weekly samples.001DMonth Ha Ni Pb ZnJAN DNQ(0.079)DNQ(7)

ND(5) 170FEBMARAPR ND(O.050)

ND(5) ND(5) 90MAYJUNJUL DNQ(0.094)

ND(5) ND(5) 33AUGSEPOCT ND(O.050)

ND(5) ND(5) 75NOVDEClimit: noneNote: 001D, 001H and 001L analyses perforn00IF analyses performed quarterly on a comDISCHARGE 001D, H, L, F, METALS (avg. ug/I)001 H 001L 001FHa Ni Pb Zn Ha Ni Pb Zn Hg Ni Pb ZnDNQ(0.13) 28 DNQ(5) 17 DNQ(0.11)

ND(5) ND(5) ND(5) DNQ(0.12) 12 ND(5) 31ND(O.050) 12 DNQ(5) DNQ(6) ND(0.050)

ND(5) ND(5) ND(5) ND(O.050)

I1 ND(5) 29ND(O.050) 21 <10 <10 ND(O.050)

ND(5) ND(5) ND(5) ND(O.050)

ND(5) ND(5) 29ND(0.050) 18 12 DNQ(7) ND(0.050)

ND(5) ND(5) ND(5) ND(0.050)

DNQ(7) 13 15reed on quarterly composites.

posite of weekly samples.Page 4 of 6 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantMONTHLY TOTAL SUSPENDED SOLIDSAverages (mg/I)Month 001D* 001G 001H 0011 001J 001K 001L 001M 001P 002 003JAN <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 5MAR <5 DNQ(2) DNQ(2) ND(2) ND(2) 7 DNQ(3) 6APR <5 ND(2) ND(2) ND(2) 18 DNQ(2) 5MAY <5 ND(2) ND(2) ND(2) DNQ(2) DNQ(3) <5JUN <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) 6OCT <5 ND(2) ND(2) ND(2) DNQ(2) DNQ(2) 17NOV <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: 3030 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 & OILAverages by Month (mg/I)Month 001D* 001G 001H 001I 001J 001K 001L 001M 001P 002 003 004JAN <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 <5.0SEP 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: 1515 15 15 1515 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 theDiablo Canyon Power PlantQUARTERLY ACUTE AND CHRONIC TOXICITY TESTING(toxicity units, tu. and tujACUTETest 6-Month*CHRONICTestMonth Result Median ResultJAN 0.00 0.00 1.00FEBMARAPR 0.00 0.00 1.00MAYJUNJUL 0.00 0.00 1.00AUGSEPOCTNOVDEC 0.00 0.00 1.006-month median limit: 0.26 5.1* This parameter is monitored for the State Ocean Plan instead of theNPDES Permit. A value of 1.0 indicates no chronic toxicity.

DISCHARGE 001NANNUAL ANALYSESSludgen- ,1.I ..tarameter u In .Percent MoistureTotal Kjeldahl NitrogenAmmonia (N)Nitrate (N)Total Phosphorous pHOil and GreaseBoronCadmiumCopperChromiumLeadNickelMercuryZincVolume99%37000 mg/kg6000 mg/kgND(180)25000 mg/kg7.3ND(0.10)

%1500 mg/kg1.0 mg/kg350 mg/kg10 mg/kg8.9 mg/kg11 mg/kg1.0 mg/kg760 mg/kg75.41 tonsNoneNoneNoneNoneNoneNoneNoneNone10 X STLC*10 X STLC10 X STLC10 X STLC10 X STLC10 X STLC10 X STLCNoneNote: Annual samples were collected in October.* STLC = Soluble Threshold Limit Concentration Page 6 of 6 Annual Discharge Monitoring ReportAPPENDIX 3GRAPHICAL SUMMARIES OF INFLUENT AND EFFLUENT MONITORING 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001 INFLUENTTemperature

(*F)90.0 T80.0 +70.060.0w 50.0040.030.0k--A--- -I* p20.0 +f--*-AverageI

---Low I10.00 .0 I I I i I I i IJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013DISCHARGE 001 EFFLUENTTemperature (1F990.0 T80.070.060.0LL50.00aHigh30.0 +20.0 A10.00.0JAN FEB MAR APR MAYJUN JUL AUG SEP OCT NOV DEC2013Page lofl5 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001 EFFLUENTFlow (MGD)300025000S2000U._ 1500o 1000500ý LimitHigh-- -- Average-Low0 I ii I I i i i I j IJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013DISCHARGE 001 EFFLUENTMonthly Delta T (°F)2520L. 152o1050LimitHigh---4-- AverageJAN FEB MAR APR MAYJUN JUL AUG SEP OCT NOV DEC2013Page 2 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001Total Chlorine

Residual, ug/1High~.~Average~

120100807a, 604020JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Values plotted at zero were below the reporting limit.DISCHARGE 001Total Chlorine Used, pounds per daySoo --d High800 --4-- Average700600Soo*500a.400o 300200100JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Page 3 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001Copper (monthly

average, ug/I) I -Permit Limit and Reporting LimitI Influent-b EffluentI 12108-J06420J3530125AN FEB MAR APR MAY JUN JUL AUG2013Note: 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 001Nickel (monthly

average, ugl!)W Discharge Permit Limit--- InfluentEffluent--4-- Analytical Reporting Limit20 +-J: 15105W ---Jan Feb Mar Apr May Jun Jul Aug Sep2013p pOct NovDecNote: 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 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001Zinc (monthly

average, ug/l)8070 -6050,-J403020100JAN1816141210 --- Discharge Permit Limit--- Influent------ Effluent-----Analytical Reporting LimitFEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.DISCHARGE 001Chromium (monthly

average, ug/I)6-Month Median and Analytical Reporting LimitInfluentEffluentJ4A0JANFEB MAR APR MAY2013Note: 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 byan 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.Page5 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantpH8.68.48.28.07.87.67.47.2-001 Influent-- -- 001 Effluent002-0--- 0030047.0 -JANFEB MAR APR MAY JUN JUL AUG SEP OCT2013NOV DECNote: Several data points on this chart overlap.Discharge 001Ammonia (as N, ug/I)3500300025002000co= 15001000500--------11111116-Month Median LimitInfluentEffluentAftJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: 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 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001 FOil & Grease(Maximum, mg/I)25.0 T20.015.0tEDaily Maximum Limit--- Monthly Average Limit---.- Sample Result (Maximum)

--- Analytical Reporting Limit10.0 +5.0onfiltll:: lII qJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Values plotted at zero were below the detection limit.DISCHARGE 001FSuspended Solids(Maximum, mg/I)12010080a 60E4020---- Daily Maximum Limit I-0--- Monthly Average Limit--- Sample Result (Maximum)

-Analytical Reporting UmitL " " -I0 3F F " " vJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Maximum values are plotted.Page 7 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001NOil & Grease (mg/I)--- Dally Maximum LimitMonthly Average Limit_ Daily Maximum--- AverageAnalytical Reporting Limit252015E 1050 -JANFEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Daily maximum and monthly average values overlap at eight points on this plot.DISCHARGE 001NSuspended Solids (mg/I)Monthly Average LimitDally MaximumAverage706050S40E 302010.... ... ... ..n-IJANFEB MAR APRMAY JUN JUL AUG SEP2013OCT NOVDECNote: There is no limit for daily maximum values. The average values are below the monthly average limit.DISCHARGE 001NSettleable Solids (ml)3.53:2.52E 1.510.50Daily Maximum Limit--Monthly Average LimitDally MaximumAverageCp p p p pJAN FEB MAR APR MAYJUN JUL AUG2013SEP OCT NOVDECNote: Values plotted at zero were below the detection limit.High, average, and low values overlap at twelve points on this plot.Page 8of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001DQuarterly Metals (ug/l)2520151050-180160140120-100806040200a7lierlECadm~umI MChromiurI 1 FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.DISCHARGE 001DQuarterly Metals (ug/l)ImLeadiWZ~nciw~rurJJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: 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 theDiablo Canyon Power PlantDISCHARGE 001F10 Quarterly Metals (ug/I)98 1Silver0 Cadmium7 UChromium 6

• CopperCA6432I0 -! ! I I IJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.DISCHARGE 001FQuarterly Metals (ugil)50 a Mercuryn NickelELead40 7iInc3020100 jlJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: 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 theDiablo Canyon Power PlantDISCHARGE 001HQuarterly Metals (ug/h)5045403530m252015105013Silver* CadmiumW Chromiuma CopperJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.DISCHARGE 001HQuarterly Metals (ugIl)30 T25 +NNickel*Lead*Zinc20 +-I 1510t°0 -JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.Page 11 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantDISCHARGE 001LQuarterly Metals (ug/I)20181614 -lacadmiumi IUChromluml 12 +86420I I I I I I I I I IJAN FEB MAR APR MAYJUN JUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.DISCHARGE 001LQuarterly Metals (ug/l)14 +12 +10 +0)6-42ImNickell ELeadi0I I I I IJAN FEB MAR APR MAY JUNJUL AUG SEP OCT NOV DEC2013Note: The analyte was not detected at or above the detection limit for values plotted at zero.Page 12 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantMONTHLY TOTAL SUSPENDED SOLIDS(Average, mg/I)35 -302520E 1s1050353025--Montdy Average mt0O01D-,-4-,-001G0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Points on chart may overlap.

Values plotted at zero were below the detection limit.MONTHLY TOTAL SUSPENDED SOLIDS(Average, mg1i)-- Monthly Average Lim--- 001i--4--- 001 L9 00EE20151050JANFEB MAR APRMAY JUN JUL AUG SEP OCT NOV DEC2013Note: Points on chart may overlap.

Values plotted at zero were below the detection limit.MONTHLY TOTAL SUSPENDED SOLIDS(Average, mg/I)353025c 20E 1510502013Note: 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 theDiablo Canyon Power PlantQUARTERLY OIL & GREASE(Average, mg/I)1614121 001--1-- Monthly Average UmitS86420 LJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Values plotted at zero were below the detection limit. Less than values are plotted at the value.QUARTERLY OIL & GREASE(Average, mg/I)16141210 1 O01MMonthly Average Limit8E6420 .--IJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Values plotted at zero were below the detection limit.QUARTERLY OIL & GREASE(Average, mg/I)161412 00210 o003E 6 Monthly Average Limit6420 I I IJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Note: Values plotted at zero were below the detection limit.Page 14 of 15 2013 Annual Summary Report on Discharge Monitoring at theDiablo Canyon Power PlantACUTE AND CHRONIC TOXICITY(6-Month Median)-_ -_ -_ -_ --_ -_ -_ -_ -_ -_ -6.005.00E4.00.>,3.00'R 2.000'"1.000.00Chronic Bioassay Results--0-- 6-mo. Median Acute LimitAcute Bioassay ResultsChronic Limit-4-Acute 6-month MedianJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC2013Page 15 of 15 Annual Discharge Monitoring ReportAPPENDIX 4SUMMARY OF RWMP MONITORING FOR 2013RWMP 1st Survey 2nd Survey 3rd Survey 4th SurveyStudy Stations/

Completion Completion Completion Completion Surveys Stations/

Stations/

Stations/

Stations/

per Year Dates Dates Dates DatesHorizontal Band Transects 14 / 4x Mar 08 Jun 13 Sep 18 Dec 16Vertical Band Transects 5 I 4x Feb 08 May 29 Aug 21 Dec 06Benthic Stations 8 I 4x Mar 19 May 10 Aug 28 Nov 25Fish Observation Transects 12 / 4x Mar 29 Jun 25 Sep 11 Dec 09Bull Kelp Census */lx n/a n/a n/a Oct 17Temperature 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).