DCL-2004-516, Annual Report for 2003 on Discharge Monitoring

Annual Report for 2003 on Discharge Monitoring

ML040650400
Person / Time
Site:	Diablo Canyon
Issue date:	02/28/2004
From:	Becker J Pacific Gas & Electric Co
To:	Christine Briggs Office of Nuclear Reactor Regulation, State of CA, Central Coast Regional Water Quality Control Bd
References
CA0003751, DCL-2004-516
Download: ML040650400 (39)

Text

fm PacificGas and

&'R Electic Company James R.Becker Diablo Canyon Power Plant Vice President-Diablo Canyon PO. Box 56 Operations and Station Director Avila Beach. CA 93424 805.545.3462 Fax: 805.545A234 Certified Return/Receipt Date: IFebruary 28, 2004 #7001-0360-0000-2103-5811

__1 PG&E Letter DCL-2004-516 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

Dear Mr. Briggs:

In accordance with Order 90-09, NPDES No. CA0003751, enclosed is the Annual Report for 2003 on Discharge Monitoring at Diablo Canyon Power Plant (Enclosure 1).

Facility Name: Diablo Canyon Power Plant Address: P.O. Box 56 Avila Beach, CA 93424 Contact Person: Drew A. Squyres Job

Title:

Supervisor, Environmental Operations Phone Number: 545-4439 WDR/NPDES Order Number: Order No. 90-09, NPDES No. CA0003751 Type of Report: (check one) QUARTERLY ANNUAL 0 0 5st 3 rd 4 th Quarter: (check one):

• 2 nd 0 01 0 0 Year: 2003 (Annual Reports for DCPP are Jan-Dec)

Violation(s) (Place an X by the appropriate choice):

• O No (there are no violations to 0 Yes report)

• Please see "Review of Compliance Record and Corrective Actions" section

5--C'-Z'S

PG&E Letter DCL-2004-516 Mr. Briggs February 28, 2004 Page 2 If Yes is marked (complete a-g):

a) Parameter(s) in Violation:

b) Section(s) of WDR/NPDES Violated:

c) Reported Value(s) d) WDR/NPDES Limit/Condition:

e) Dates of Violation(s)

(reference page of report/data sheet):

f) Explanation of Cause(s): (If 'YES', see overview section of attached report)

(attach additional information as needed) g) Corrective Action(s): (If "YES', see overview section of attached report)

(attach additional information as needed)

PG&E Letter DCL-2004-516 Mr. Briggs February 28, 2004 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, please contact Drew Squyres at (805) 545 - 4439.

Sincerely, (7 1/ // -N Name: James R. Becker

Title:

Vice President - Diablo Canyon Operations and Station Director 2004516/RDH/kmo

PG&E Letter DCL-2004-516 Mr. Briggs February 28, 2004 Page 4 cc: Michael Thomas, CCRWQCB 895 Aerovista, Suite 101 San Luis Obispo, CA 93401-7906 California Department of Fish and Game 20 Lower Ragsdale, Suite 100 Monterey, California 93490 Regional Administrator, Region 9 U. S. Environmental Protection Agency 75 Hawthorne Street San Francisco, CA 94105 Attention: Carey Houk (W-5-3)

Resident Inspector, David Proulx U.S. Nuclear Regulatory Commission Diablo Canyon Power Plant 104/5 Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Dr., Suite 400 Arlington, TX 76011-8064 Director, Division of Reactor Projects U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Dr., Suite 400 Arlington, TX 76011-8064 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Enclosure

ENCLOSURE ANNUAL

SUMMARY

REPORT ON DISCHARGE MONITORING AT THE DIABLO CANYON POWER PLANT (NPDES NO. CA0003751) 2003

PG&E Letter No. DCL-2004-516 2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant TABLE OF CONTENTS PAGE OVERVIEW

SUMMARY

OF MONITORING PROGRAM 1 A. Monitoring of Plant Influent and Effluent 1

1. Monitoring Data 1

2. Facility Operating and Maintenance Manual 1

3. Laboratories Used to Monitor Compliance 1

4. Review of Compliance Record and Corrective Actions 2 B. Monitoring of Receiving Water 4

1. Ecological Studies at Diablo Canyon 4

2. Shell Debris Deposition and Foam Studies 4

3. In-Situ Bioassay 4 C. Acti-Brom Treatment Program 4 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 2003 ENCLOSURE 2 - Errata Information

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant OVERVIEW A. This annual summary report follows the format used in quarterly monitoring reports. Analytical results below the respective Reporting Limit are plotted as "zero' value in accordance with ELAP guidance. During 2003, discharges occurred from all discharge paths except 0011, 001K, and 017.

B. 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 1990 Ocean Plan were each analyzed for and reported in the permit renewal application for Diablo Canyon Power Plant (DCPP) submitted in October 1994 and 2001. There have been no changes in the activities conducted at the plant that would have significantly affected the results previously reported in the above referenced document.

SUMMARY

OF MONITORING PROGRAM A. Monitoring of Plant Influent and Effluent

1. Monitoring Data

a. Appendix 1 provides a list of the 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. All results were less than 3 mg/I. No discharges that resulted in adequate sample quantities occurred from 016 and no discharge occurred from 017 during 2003.

c. In October, Discharge 001 D (Liquid Radioactive Waste Treatment System) annual grab sample for boron was collected and analyzed. In November, lithium and hydrazine annual grab samples were collected and analyzed for Discharge 001 D. The results were 710 mg/I, 199 mg/I, and 246 mg/I, respectively.

2. Facility Operating and Maintenance Manual Pacific Gas and Electric Company (PG&E) maintains a multiple volume Plant Manual (manual) at DCPP that contains procedures used for operation and maintenance activities at the plant, including those activities that relate to wastewater handling, treatment, sampling, analysis and discharge.

Plant procedures are prepared and reviewed by DCPP Staff and approved by DCPP Management.

DCPP conducts biennial internal audits that review NPDES Plant procedures contained in the manual. Ongoing reviews of Plant procedures are conducted to assure that the manual remains valid, current, and complete for the facility.

3. Laboratories Used to Monitor Compliance

a. PG&E Chemistry Laboratory, DCPP, Avila Beach, California

b. Aquatic Bioassay Consultants, Ventura, California

c. FGL Environmental, Santa Paula, California

d. PG&E, Technical and Environmental Services, Geotechnical Laboratory, San Ramon, California I

e. Creek Environmental, San Luis Obispo, California

f. Columbia Analytical Services, Kelso, Washington

4. Review of Compliance Record and Corrective Actions

a. Circulating Water Pump Chlorination/Acti-Brom Monitoring The 2003 quarterly NPDES reports discuss the times when monitoring for chlorination cycles were interrupted. These are listed below with a brief description of the cause and corrective action.

When these monitoring interruptions occurred, engineering evaluations (approved by the CCRWQCB 1/13/94; PG&E Letter No. DCL-94-002) were performed. Detailed descriptions of these evaluations are included in the quarterly reports. The evaluations conclude that discharge chlorine limits were not exceeded in 2003.

Date Chlorination Cycle Monitoring Interrupted Cause Corrective Action 5/25-26/03 Unit 1 injection cycle monitoring readings Insufficient flow Proper flow inaccurate to monitor reestablished to normal by flushing monitor sample line.

7/23-24/03 Unit I injection cycle monitor readings Monitor Proper flow inaccurate developed low reestablished to flow normal.

9/20-25/03 Unit land 2 injection cycle monitor readings Sample line Unclogged lines and inaccurate clogged with reestablished proper marine growth flow.

b. Drains of Closed Cooling Water Systems PG&E received concurrence from the CCRWQCB in response to a letter dated July 19, 1995 (PG&E Letter DCL-95-156), for the use of biocides glutaraldehyde and isothiazoline to control microbiological growth and corrosion in DCPP's closed cooling water systems. Any drainage from these systems is discharged at a flowrate such that the chronic toxicity level is below the

'No Observable Effect Concentration' (NOEC) at NPDES Discharge 001. The volumes of cooling water drained in 2003 from the component cooling water (CCW), intake cooling water (ICW), and service cooling water (SCW) systems are presented below. The glutaraldehyde and isothiazoline concentrations presented in the table below are system concentrations, not concentrations discharged.

Volume Glutaraldehyde Isothiazoline Reason &

Date System (gal) (mg/I) (mg/I) Comment 12/24/02 Unit 1 1660 0 0 System leakage (see to 1/02/0 ICW explain in d. below) 2/04/03 Unit 2 1150 0 5 Routine lCW maintenance.

2/11/03 Unit 2 4200 0 0 Routine CCW . maintenance.

3/17/03 Unit 2 1 213 0 Routine CCW maintenance 4/08//03 Unit 2 50 0 0 Routine ScW I maintenance 2

4/14/03 Unit 1 33,000 0 2.5 Routine SCW maintenance 8/29/03 Unit 1 1.9 185 0 Routine CCW maintenance 9/26/03 Unit 1 1400 8 0 Routine EDR I maintenance 12/08/03 Unit 1 1000 143 0 Routine

__ I_ CCW I maintenance

c. January On January 2, 2003, it was identified that between December 24, 2002, and January 2, 2003, a small leak of closed cooling water from the Unit 1 Intake Cooling Water system (ICW) occurred.

The total volume over this period of time was estimated to be 1660 gallons. The leak rate was estimated to be 6.5 gallons per hour and flowed into the once-through circulating cooling water system at the intake. The leak rate of 6.5 gallons per hour is significantly below the allowable flow rate of 250 gallons per minute and NOEC described in the above letters. The leak was repaired on January 2, 2003.

d. February On February 16, 2003, approximately 150 gallons of water containing dilute hydrazine (746 ppm) flowed to the pavement near the Unit 2 containment due to a misaligned valve and filling activity. At that time, rain washed this water into the deluge collector sump. The sump holds about 17,000 gallons so the water was significantly diluted. The sump is designed to process water through a passive oil water separator system prior to flowing to a retention basin near the intake cove. No processed water entered the ocean. The Regional Board was notified on February 16, 2003, of this event as a conservative measure even though there was no actual release to the creek or ocean. Analytical results for hydrazine collected from sediment samples in the retention basin were below published toxic levels.

e. May Unit 1 discharge chlorine monitor had low flow from 2000 on May 25, 2003 through 1200 on May 26, 2003. Proper flow was reestablished after the 1200 injection on May 26, 2003. An engineering evaluation was completed in accordance with PG&E's January 5, 1994, letter as authorized by the CCRWQCB. The calculated value from the engineering evaluation was 27 ppb, well below the 89 ppb Ocean Plan limit.

f. July Unit 1 discharge chlorine monitor had low flow from 1200 on July 23, 2003 through 0800 on July 24, 2003. Proper flow was reestablished for the 1200 injection on July 24, 2003. An engineering evaluation was completed in accordance with PG&E's January 5,1994, letter as authorized by the CCRWQCB. The calculated value from the engineering evaluation was <10 ppb, well below the 89 ppb Ocean Plan limit.

g. September Unit 1 and Unit 2 discharge chlorine monitors had reduced flow due to blockage by marine fouling during September 20, 2003 and September 25, 2003. The blockage was removed and proper flow was reestablished. An engineering evaluation was completed in accordance with PG&E's January 5, 1994, letter as authorized by the CCRWQCB. The calculated values from the engineering evaluation were for Unit 1: <1 Oppb (for 9/20 - 22/2003) and 21 ppb (for 9/23 -

25/2003); Unit 2: 14ppb (for 9/20 - 22/2003) and 17ppb (for 9/23 - 25/2003). These values are well below the 89 ppb Ocean Plan limit.

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h. October Because there was no 001 M discharge in October, 001 M Oil and Grease sample was collected in November rather than in October.

October composite samples for 001 D were collected as required and picked up for analysis by an ELAP Certified contract laboratory. The composite consisted of nine aliquots. In November, it was discovered that the contract lab had only analyzed five of the nine aliquots.

By the time the contract lab located the other four samples, which they misplaced, the samples had exceeded required holding times rendering them invalid for analysis. An additional three aliquots for 001 D were collected and the contract lab analyzed these aliquots in December.

The contract lab has written a quality assurance report and reviewed sample-handling procedures with staff to minimize the potential of future occurrence.

i December During the week of 12/29/03, weekly NPDES samples for 001N were not collected. These samples included the following parameters: total suspended solids, settleable solids, and oil and grease. The previous week, samples collected on 12/23/03 for these parameters were well below NPDES limitations with results of 9 mg/I, ND<0.1 ml/I, and ND<5mg/l, respectively.

Samples collected on 1/5/04 were also well below NPDES limitations with results of 15mg/I, ND<0.lmVI, ND<5mg/l, respectively. On 1/5/04, there were no observed changes in the treatment plant operation from that of 12/23/03. Treatment plant flows were lower than normal for this period. Based on this information, the treatment plant is believed to have operated in compliance during the week samples were not collected. The contractor that performs sampling has implemented a new procedure and appropriate steps to ensure adequate support is available to minimize the potential of future recurrence.

B. Monitoring of Receiving Water

1. Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2003 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 again not requested to be performed in 2003. Results of 2001 RWMP data were submitted to the CCRWQCB on April 30, 2002. Results for July 1995 through June 2002 were analyzed in a report submitted to the CCRWQCB on November 8, 2002. A table in Appendix 4 summarizes requirements and completed tasks for 2003.

2. In Situ Bioassay Results of the Mussel Watch Program are reported to the CCRWQCB directly from the California Department of Fish and Game in their periodic report for this program.

C. Acti-Brom Treatment Program During 2003, DCPP continued its integrated Acti-Brom and "foul release coating" strategy to control macrofouling in the Circulating Water System (CWS). Acti-Brom is a sodium bromide solution with 4

an added biodispersant that is used, in combination with sodium hypochlorite, to control settlement and growth of biofouling organisms. The program consists of six daily 20-minute injections (at four hour intervals) of a 1:1 molar ratio blend of Acti-Brom and sodium hypochlorite to all four of DCPP's intake conduits). Each injection attempts to achieve a target concentration of 200 parts per billion (ppb) Total Residual Oxidant (TRO) when measured at the inlet waterbox of the condenser.

Discharge TRO, measured at the plant outfall, remained below NPDES limitations and typically are between approximately 20 ppb to 60 ppb. In conjunction with the Acti-Brom treatment, untreated portions of the CWS were previously painted with a non-toxic "foul release coating" to help prevent attachment of fouling organisms.

Unit 1 started 2003 with simultaneous sodium hypochlorite and Acti-Brom treatment six times daily.

Acti-Brom injections were turned off on March 5, 2003 in anticipation of a tunnel cleaning in April 2003. The tunnel cleaning was postponed twice and Unit 1 conduits received injections of sodium hypochlorite six times daily to control microfouling in the condensers for the remainder of March, April and most of May, with a brief interruption in late March due to a programming error.

Simultaneous sodium hypochlorite and Acti-Brom treatments were re-initiated in late May and continued six times daily until injections were shut down for the tunnel cleaning near the end of June. At the end of the tunnel cleaning simultaneous sodium hypochlorite and Acti-Brom treatments six times daily resumed and continued through the rest of 2003. There were brief interruptions due to maintenance activities in early July, early August, and mid September, and December.

Conduit 2-1 began 2003 with injections of sodium hypochlorite six times daily to control microfouling in the condensers in anticipation of the 2R1 I refueling outage (end of January). Conduit 2-2 received simultaneous sodium hypochlorite and Acti-Brom treatment six times daily until early January when Acti-Brom was shut down in anticipation of 2R1 1. Both conduits received microfouling injections six times daily until the start of 2R1I. Unit 2 injections remained off until.

early March when one of the circulating water pumps was returned to service. Through the remainder of March, treatment alternated between the two Unit 2 conduits as the circulating water pumps were turned on and then shut down for 2R1 1 related activities.

At the end of 2R1 1, an experiment was initiated to test the effectiveness of sodium bromide compared to Acti-Brom in controlling macrofouling. For the remainder of 2003, conduit 2-1 received simultaneous injections of sodium hypochlorite and Acti-Brom, while conduit 2-2 received simultaneous injections of sodium hypochlorite and sodium bromide. There were brief interruptions due to maintenance activities in early April (conduit 2-1), July, early August, September, October, and December.

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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

APPENDIX 2 TABULAR SUMMARIES OF INFLUENT AND EFFLUENT MONITORING

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 TEMPERATURE (DEG IF) FLOW (MGD)

INFLUENT EFFLUENT DELTA T Month high low avu hlgh low avo high avo hiph low ava JAN 57.2 553 56.4 763 74.5 75.4 19.2 19.0 2486 2486 2486 FEB 57.5 542 55.9 76.5 72.5 74.7 19.1 18.8 2486 1239 1345 MAR 54.7 49.2 51.8 73.5 61.8 67.2 18.9 15.3 2486 1239 1814 APR 55.5 49.1 49.6 71.2 62.1 65.6 19.2 16.0 2486 1862 2168 MAY 52.6 49.0 50.5 71.6 68.0 69.6 19.6 19.1 2486 2486 2486 JUN 54.6 49.7 50.5 739 68.8 69.2 20.7 18.7 2486 1874 2333 JUL 58.2 49.4 52.8 77.9 68.5 71.9 19.7 19.2 2486 2436 2484 AUG 57.7 503 52.6 773 70.0 72.1 19.9 19.5 2486 2486 2486 SEP 58.8 51.6 54.4 78.5 70.9 73.8 20.0 19.4 2486 2486 2486 OCT 59.7 52.9 562 78.6 72.2 75.4 19.4 19.2 2486 2486 2486 NOV 593 54.0 56.9 78.7 73.6 76.3 19.7 19.4 2486 2486 2486 DEC 57.2 54.8 55.7 76A 64.8 74.5 19.5 18.8 2486 1976 2466 limit: 22 2760 The INFLUENT and EFFLUENT "high" and "low" values correspond to the highest and lowest daily average value for that month. The INFLUENT high and low does not necessarily correspond to the same day as the high and low for the EFFLUENT for that month. The "avg" 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 values. The "Avg" is calculated from INF and EFF monthly avg values.

DISCHARGE 001 TOTAL RESIDUAL TOTAL CHLORINE CHLORINE (daily max. ug/1) USED (lbs/day)

Month high low avg high low avg JAN 62 29 41 526 384 481 FEB 36 <20 <20 302 216 269 MAR 67 'c20 31 374 194 282 APR 61 19 31 461 228 361 MAY 46 20 34 461 372 416 JUN 46 <10 30 432 144 388 JUL 43 <10 18 605 0 449 AUG 62 14 41 792 533 641 SEP 47 * <10 22 835 533 671 OCT 39 <10 13 907 475 679 NOV 27 <10 <10 821 432 666 DEC 39 <10 21 576 418 545 Note that the residual chlorine limits in Permit CA0003751, Order 90-09 is a daily max of 200 uglh and Includes a time-based limit (per the Ocean Plan) which depends on the length of the respective chlorination cycle.

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2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ugI1) lCHROMIUM COPPER NICKEL *ZINC lMlnnth Influent Effluent Influent Effuent Influent Emuent Influent Emuent JAN ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 11 ND(10)

FEB ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 13 ND(10)

MAR ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 18 ND(10)

APR ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 11 ND(10)

NAY ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 10 ND(10)

JUN ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

JUL ND(10) ND(1O) ND(10) ND(1O) ND(10) ND(10) ND(10) ND(10)

AUG ND(10) ND(10) ND(10) ND(1O) ND(10) ND(10) ND(10) ND(10)

SEP ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

OCV ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

NOV ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

DEC ND(10) ND(10) ND(110) ND(10) N-D(10) ND(10) ND(10) ND(1O) 6-month median limit: 10 - 10 - 30 _ 70

• Note: Influent zinc has been historically higher than effluent concentrations.

DISCHARGE 001 VARIOUS ANNUAL ANALYSES (ugA) I6-Mo. Mted.

Effluent Parameter Influent Effluent limit Arsenic 13 13 30 Cadmium 0.11 0.06 10 Cyanide ND(10) ND(10) 30 Lead 0.29 0.04 10 Mercury ND(.001) ND(.001) 0.2 Silver 0.08 0.07 2.9 Titanium - ND(10) none

• Phenolic Cmpds ND(11.82) ND(11.82) 150 (non-chlorinated)

"Phenolic Cmpds ND(336) ND(336) 10 (chlorinated)

• • • PCB's ND(.52) ND(1.59) none

• Reporting limit IND (11.82)1 shown Is the sum of individual Reporting Limit's for 6 target compounds.

"Reporting limit IND (336)l shown Is the sum of Individual Reporting Limit's for S target compounds.

• • • Reporting limits 1ND(I.52) and ND(1.59)] shown are each the sum of individual Reporting Limit's for 7 target compounds.

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

Month Influent Effluent JAN ND(200) ND(200)

FEB MAR APR ND(200) ND(200)

MAY JUN JUL AUG ND(200) ND(200)

SEP OCT ND(200) ND(200)

NOV DEC 6-month median limit: 3060 Page 2 of 6

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY pH (averages)

Discharge: 001 002 003 004 0OIP -

Month Influent Eflluent JAN 8.0 8.0 8.0 8.0 8.0 7.8 FEB 8.1 8.1 8.1 8.1 8.1 8.0 MAR 8.0 8.0 8.0 8.0 8.0 7.7 APR 7.8 7.8 7.9 7.7 7.8 7.6 MAY 7.8 7.8 7.8 7.9 7.8 7.7 JUN 7.8 7.8 8.0 7.8 8.0 7.7 JUL 8.0 8.0 7.8 7.8 7.9 7.6 AUG 7.9 7.9 8.0 7.9 8.0 7.8 SEP 7.9 7.9 7.9 7.9 7.9 7.7 OCT 7.9 7.9 7.8 8.0 7.9 7.7 NOV 8.1 8.1 . 8.0 8.0 8.1 7.9 DEC 7.8 7.8 7.9 7.9 7.9 7.8 DISCHARGE 001F SUSPENDED GREASE & OIL (mgA) SOLIDS (mg/I)

Month hieh ave hieh 2vE JAN '3 <3 ND(5) ND(5)

FEB <3 <3 ND(5) ND(5)

MAR 3 <3 ND(5) ND(5)

APR <3 '3 5 5 MAY <3 <3 7 7 JUN <3 <3 6 6 JUL <3 <3 ND(5) ND(5)

AUG '3 <3 ND(5) ND(5)

SEP <3 <3 ND(5) ND(5)

OCT <3 <3 10 10 NOV <3 <3 ND(5) ND(5)

DEC d <3 ND(S) ND(5) limit: 20 15 100 30 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average Limits.

DISCHARGE OOIN (Monthly Summary of Weekly Data)

SUSPENDED SEITLEABLE GREASE & OIL (mg/i) SOLIDS (mg/i) SOLIDS (miA)

Month hieh low ave hieh low ave hieh low ave JAN ND(5) ND(5) ND(5) 24 ND(5) 14 ND(0.1) ND(0.1) ND(0.1)

FEB ND(5) ND(5) ND(5) 43 24 31 ND(0.1) ND(0.1). ND(0.1)

MAR 17 ND(5) <5 47 18 33 ND(0.1) ND(0.1) ND(0.1)

APR 12 ND(5) <5 39 8 25 ND(0.1) ND(0.1) ND(0.1)

MAY ND(5) ND(5) ND(5) 33 8 23 ND(0.1) ND(0.1) ND(0.1)

JUN ND(5) ND(5) ND(5) 33 6 17 ND(0.1) ND(0.1) ND(0.1)

JUL ND(5) ND(5) ND(5) 23 6 15 ND(0.1) ND(0.1) ND(0.1)

AUG ND(5) ND(5) ND(5) 19 6 12 ND(0.1) ND(0.1) ND(0.1)

SEP ND(5) ND(5) ND(5) 32 7 14 ND(0.1) ND(0.1) ND(0.1)

OCT ND(5) ND(5) ND(5) 45 ND(5) 21 ND(0.1) ND(0.1) ND(0.1)

NOV ND(5) ND(5) ND(5) 17 5 9 ND(0.1) ND(0.1) ND(0.1)

DEC ND(5) N'D(5) ND(S) 13 ND(') 9 ND(0.1) SD(0.1) ND(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.

Page 3 of 6

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE OOID, H, L, F, METALS (avg. ugtl) 001D 00111 001L 0OIF Month Ac Cd Cr Cu Az Cd Cr Cu Ac Cd Cr Cu At Cd Cr Cu JAN N)(10) ND(5) ND(10) 10 ND(10) ND(5) 10 170 ND(10) ND(5) ND(10) ND(10) ND(10) ND(5) ND(10) 10 FEB MAR APR ND(10) ND(5) ND(10) 20 ND(10) ND(5) 30 270 ND(10) ND(5) ND(10) '10 ND(10) ND(5) ND(10) 20 MIAY JUN JUL ND(I) 0.2 2 ND(S) ND(I) 2.0 1i 73 ND(I) 1.0 2 6 ND(I) 12 11 S AUG SEP OCT ND(I) 0.4 ND(5) 11 ND(I) 1.2 17 44 ND(I) ND(0.2) ND(5) ND(5) 1 13 6 35 NOV DEC limit: none Note: OOID, 00111 and O00L analyses performed on quarterly composites 00IF analyses performed quarterly on a composite of weekly samples.

DISCHARGE OO1D, H, L, F, METALS (avg. ugll) 001D 001 I 001L 001F Month 112 Ni Pb Zn 1Ig Ni Pb Zn 11g Ni Pb Zn 1lg Ni Pb Zn JAN ND(O.2). 20 10 930 ND(O.2) 30 ND(100) 80 ND(0.2) ND(10) ND(10) 60 0.5 ND(10) ND(10) 80 FEB MAR APR ND(Q.1) 30 20 390 0.2 50 ND(200) S0 ND(0.1) ND(10) ND(10) 80 0.2 10 ND(10) 60 MAY JUN JUL 0.1 6 1.2 90 ND(0.1) 20 9.3 20 ND(O.1) 3 5.9 ND(10) 0.1 12 3.9 10 AUG SEP OCT 0.1 19 3.4 199 ND(0.1) 15 8.3 10 ND(0.1) ND(I) ND(I) ND(10) ND(0.1) 7 3.7 20 NOV 'IND(0.1)

DEC limit: none Note: OOID, 00111 and COIL analyses performed on quarterly composites. 00IF analyses performed quarterly on a composite of weekly samples.

• Second part of a quarterly composite (3 samples)

Page4 of 6

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS Averages (mg/i)

Month 6OID* 0016 00111 0011 001J 001K 001L OOIMt 0011 002 003 JAN 11 ND(5) ND(5) ND(5) ND(5) <5 ND(5)

FEB <S ND(5) 8 ND(5) ND(5) ND(5) ND(5) ND(5) <5 MAR 11 ND(5) ND(S) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

APR 10 ND(5) ND(5) ND(5) ND(5) 8 6 ND(5)

MAY 9 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

JUN 10 ND(5) ND(5) *ND(5) 15 ND(5) ND(5)

JUL <5 ND(5) 8 ND(5) 9 ND(5) 6 AUG 10 ND(5) ND(5) ND(5) ND(5) <5 ND(5)

SEP 5 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

OCT 6 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

NOV 7 8 ND(5) ND(5) 7 ND(5) ND(5) ND(5)

DEC <5 ND(5) ND(5) ND(5) ND(5) ND(5) ND(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 2003.

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

QUARTERLY GREASE & OIL Averages by Month (mg/I)

Mnnth 001D'* Cofi 00111 0011 0013 001K 001L 001NI 001P 002 003 WIt JAN <3 <3 3 <3 <3 <3 <3 a3 FEB 9 a3 MAR APR <3 <3 MAY <3 <3 <3 JUN

<3<

JUL <3 <3 <3 <3 . <3 AUG 3 SEP Ocr <3 3 <3 <3 NOV DEC Limit: 15 15 15 15 15 15 15 15 15 15 15 15

• Discharges from 001D are batched. Monthly averages are flow weighted.

Note: No discharges occurred from 0011 and 001K during 2003.

PageS of 6

• 2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING (toxicity units, tu, and tu,)

ACUTE *CIRONIC Test 6-Mfonth Test Month Result Median Result JAN 0.00 0.00 1.0 FEB MAR APR 0.00 0.00 1.0 MAY JUN JUL 0.00 0.00 1.0 AUG SEP OCT 0.00 0.00 1.0 NOV DEC 6-month median limit: 0.26 5.1 I It should be noted that this parameter is monitored for the State Ocean Plan instead of the NPDES permit. A value of 1.0 indicates no chronic toxicity.

DISCHARGE 001N ANNUAL ANALYSES Sludge Parameter Result Limit Percent Moisture 99% None Total Kieldahi Nitrogen 700 mg/kg None Ammonia (N) 75 mg/kg None Nitrate (N) ND(0.1) mg/kg None Total Phosphorus 200 mg/kg None pi] 6.8 None Oil and Grease 140 mg/kg None Boron ND(3) mg/kg None Cadmium ND(0.3) mg/kg *o10X STLC Copper 5 mg/kg 10 X STLC Chromium ND(0.5) mg/kg 10 X STLC Lead ND(I) mg/kg 10 X STLC Nickel ND(0.5) mg/kg 10 X STLC Mtercury ND(0.04) mg/kg 10 X STLC Zinc 20 mg/kg IOX STLC Volume 0.91 tMns None Note: Annual samples were collected in October

• STLC - Soluble Threshold Limit Concentration Page6 of 6

APPENDIX 3 GRAPHICAL SUMMARIES OF INFLUENT AND EFFLUENT MONITORING

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Temperature(r)i 90.0 -T 80.0 -

70.0 -

60.0 50.0-I-U" 40.0 30.0 A Iflitb 20.0 I Avente 10.0 - Law 0.0 l i li JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 DISCHARGE 001 EFFLUENT Temperature(rI0 90.0 -

80.0-AI = $

70.0-60.0- - _

4.

CI50.0 - -

t:

0 40.0 -

30.0 A H 20.0 - Avfnag 10.0 - Slav 0.0 - I I I I I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 PageI of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flaw (MGD) 3000 ;

2500 4, 2000-

_ 1500-A 1000 500 I-*--Avm"Ce Wo 0-JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 DISCHARGE 001 EFFLUENT Afonthly Delta T(r'f 25 I . . . .

20 I

& A- ---- W b_ O -

15i +

0 10 Umit A fligb 5+

. AveraSe 0 I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Page 2 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Total ChlorineResidual 80 70 60 50 30 20-10 JAN FEB MLAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

I--

DISCHARGE 001 Total Chlorine Used 1000 9000 800 k l 100 600 500J 400 300 200 100 JAN FEB MA4R APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Page 3 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper (monthly average) 121 10 8

4

.* Inflaent 2

. EmLent 01 A A a a A a is A A JAN FEB MAR APR uAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

The 6-month median limit is plotted on this chart.

DISCHARGE 001 Nickel (nonthly average) 3i NM 30 25 720

'15 10

. I nnuest 5 i . +EmAA nt 0 Il A A 1K &' & A A *

• JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

The 6-month median limit Is plotted on this chart.

Page 4 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant ,

DISCHARGE 001 Zinc (monthly average) s8o0 70 60 50 +

b40 30 +

_Imrit 20 A InfAueet 10 n _

I A atn JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

The 6-month median limit is plotted on this chart.

DISCHARGE 001 Chromium (monthly average) 12 8-a 6-4-

2 2 A ifnuent

• Aj ^*

• * *p

• i JAN FEB MLAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

The 6-month median limit is plotted on this chart PageS of 15

2003 Annual Summary Report on Discharge Monitoring at -the Diablo Canyon Power Plant-pH r_

7.3 1 1 1 1 1 I i i i JAN FEB hlAR APR hlAY JUN JUL AUG SEP ocr1 NOV DEC 2003 Note: Scveral data points on this chart ovcrlap.

Discharge 001 Ammonia (as N) 3500 T 3000* * * * * *

• t * *

• 2500 --

2000 hot hledian Limit 1500 - AInfluent 5000 -

500 A JAN FEB hlAR APR hlAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Thc analyte wvas not detected at or above the reporting limit for values plotted st zero.

Influent and E~uent values overlap at four points on this plot.

Page6 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE OO1F 01l Grease avgmA 25.0 -

20.0 15.0 E 11D alyMNlaimurn Lmif 10.0 +

0-Monthly Average Umit

+Sample Result 5.0 -

0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

DISCHARGE OOIF Suspended Solids avg mtgi 120 100 I

80 +

L ODoulDly Mavximum mit

-- nthly ahyAvn= limit E 60 4Sample Result 40 +

20 0

tI

- - I

- . I JAN FEB - MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero. When sample values were above the detection limit, the maximum values arc plotted (April, Mlay, June and October).

Page 7 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant 25 20

%15 E10 5

O Ia _-

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

Low and average values overlap at twelve points on this plot.

70 T 60 *-

50 -

l 40 -

E 30 20 10J 0g JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

DISCHARGE OOIN Settleable Solids 2.5 S 2 -

E 1.5 1

0.5 0

JAN FEB MIAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

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

Page 8 of 15

2003 Annual Summary Report on Discharge Monitoring

-at the Diablo Canyon Power Plant DISCHARGE OOID QuarterlyMetals 25 20

[ ilver 15 *Cadmium C Chromium R Copper

=

10 5

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE OO1D Quarterly . etals 800 5

• Afercury

,,7 700

• Nickel N 600 MLead a 500 *Zine 400

& 300 200 100 0

JAN FEB MUAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page9 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 00lF 40 T QuarterlyMetals I -

• Silver

• Cadmium Xj 20 MChromium I

ElCopper 35 10 5

0 F I I I I ml I I I J, I I 340 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE OOIF Quarterly AMetals 140 -

120 -

100-80 -

[iilercury 60 -

• Nickel 3 Lead 40 - lnZine 20 -

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte Was not detected at or above the reporting limit for values plotted at zero.

Page10 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE OOIH QuarterlyMetals 300 250 200

?50 Silver 100

• Cadmium A Chromium O Copper 50 0

JAN FEB MAR- APR MfAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE OOIH Quarterly leetals 90 80 70 60 50 [iMercury

• 40 *Nickeln ALeadi 30 20 10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page11 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE DO1L Quarterly .letals 7

6 5

4 Silver 3 *Cadmium 2 ElChromium 0 Copper 1

0 JAN FEB MIAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE OIL Quarterly Mfetals 90 80 70 60

%50 E Mercury a 40

• Nickel 30 13 Lead D Zi.

20 10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 12 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS Average 35T 30 * *1" 01 25 -Efifoathly Average Umit 20 . O A I E 15- 00111 10 5

0 JAN FEB MIAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS Average 5T Ju 25 M,,,tbly Average Unit

%20 ..I 0011,I E is 0 COIM I 10 0

5 g p p p JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Points on charts may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS Average 35 T 30"

• M 25 EMoanIly Average Unit

~20- . -002 E 15- 0o003 10 5

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Points on charts may overlap. Values plotted at zero were below the reporting limit.

Page13 of 15

2003 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY OIL & GREASE Average 16 - * .

• _ *_*_*_*_._.

14 12 _OOID

_OOICI 10- *- oox

- -*-Monthly Avenge Umit 6

• 4-02 I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

QUARTERLY OIL & GREASE Average 16

• -U-U-.-.-.* U-U-U-U* U-.

14 12 _OOIJ

_OOIL 10 oon a 8 -- *Monftliy Avenrge Umit 6

4 2

O I I_ I _I I _I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

QUARTERLY OIL & GREASE Average 16 14 12 ~001?

10 003 Em 004 6 -&-bonthly Avenge Umit 4

2 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 Note: Values plotted at zero were below the reporting limit.

Page14 of 15

2003 Annual Summary Report on Discharge Monitoring

• .at the Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY 5 .0 U

.U 4.0 -Chronic Results

.E 6-mo. Median Acute Limit 3.0 Acute Results

-- *.Chronic Limit 0 2.0 F-4 1.0 -

0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2003 PageIS of 15

APPENDIX 4

SUMMARY

OF RWMP MONITORING FOR 2003 RWMP 1st Survey 2nd Survey 3rd Survey 4th Survey Stations/ Completion Completion Completion Completion Surveys Stations/ Stations/ Stations/ Stations/

Study per Year Dates Dates Dates Dates Horizontal Band Transects 14 14x Feb 26 Jun 19 Aug 27 Dec 9 Vertical Band Transects 5/ 4x Feb 27 Jun 18 Aug 28 Dec 23 Benthic Stations 8 14x Apr 2 Jun 27 Sep 10 Jan 7/04 Fish Observation Transects 121 4x Apr 6 Jul 21 Sep 19 Jan 8/04 Bull Kelp Census *I11lx I I Oct Temperature Monitoring 241** 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).

ENCLOSURE 2 ERRATA 2003 NPDES DISCHARGE MONITORING REPORTS FOR DIABLO CANYON POWER PLANT ERRATA: February 2003 monitoring data Effluent 001: Influent Temperature, Effluent Temperature, Delta Temp Temperature, and Effluent Flow 'Monthly Avg" were incorrect. The correct data is 55.9, 74.7, 18.8, 1345, respectively.

The attached monitoring report page [PAGE: (M) 1] should replace the original February monitoring data page contained in the first quarter NPDES report PG&E DCL-2003-530, dated April 18, 2003.

ERRATA: Second Quarter 2003 NPDES report uOverview" section did not include an item discussing low flow to the Unit 1 Outfall chlorine monitor on 5/25/03 and 5/26/03, and the engineering evaluation performed. Based on the results of the evaluation, chlorine concentrations at the Outfall were in compliance with NPDES permit limitations.

The attached report "Overview" includes this item and should replace the original page contained in the Second Quarter 2003 NPDES report PG&E DCL-2003-544, dated July 18, 2003.

CALIFORNIA REGIONAL WATER OUALITY DISCHARGE SELF MONITORING REPORT PACIFIC GAS AND ELECTRIC CO.

CONTROL BOARD DIABLO CANYON NUCLEAR POWER PLANT CENTRAL COAST REGION PO BOX 56 31HIGUERA AVILA BEACH, CALIF 93424 SAN LUIS OBISPO CA 93401 PAGE: (M) 1 FACILITY I.D. YEARIMO/DAY YEAR/MO/DAY STATE CODE NPDES PERMIT#

3402003001 BEGINNING 03 / 02 1 01 ENDING 03 102 i 28 06 CA0003751 STATION INFLUENT EFRLUENT 001 DELTA TEMP EFFLUENT 001 NFLUENT EFFLUENT 001 EFFLUENT001P EFFLUENT002 ANALYSIS TEMPERATURE TEMPERATURE TEMPERATURE FLOW pH pH pH pH UNITS DEGREES F DEGREES F DEGREES F MGD pH MITS pH UNITS pH UNITS pH UNITS SMPL TYPE METERED METERED METERED RECORDED GRAB GRAB GRAB GRAB FRED. CONTINUOUS CONTINUOUS CONnNUOUS DAILY MONTHLY mONTHLY ( MONTHLY MONTHLY 1 56.1 74.7 18.6 2486 2 54.8 73.4 18.6 2486 3 55.3 72.5 17.2 1706 4 55.6 74.6 19.0 1239 5 55.5 74.5 19.0 1239 8.1 8.1 2 8.1 6 55.6 74.6 19.0 1239 2 8.0 7 55.8 74.8 19.0 1239 8 56.0 75.0 19.0 1239 9 56.3 75.3 19.0 1239 10 56.1 75.1 19.0 1239 11 56.6 75.5 18.9 1239 12 57.3 76.2 18.9 1239 13 57.5 76.5 19.0 1239 14 57.2 76.2 19.0 1239 15 57.1 76.2 19.1 1239 16 57.3 76.2 18.9 1239 17 57.1 76.1 19.0 1239 18 56.9 76.0 19.1 1239 19 55.7 74.8 19.1 1239 20 54.2 73.3 19.1 1239 21 54.7 73.8 19.1 1239 22 54.9 74.0 19.1 1239 23 55.7 72.7 17.0 1239 24 55.6 73.9 18.3 1239 25 55.9 74.6 18.7 1239 26 55.1 73.8 18.7 1239 27 54.8 73.5 18.7 1239 28 54.3 73.0 18.7 1239 29 30 31 _________ . ______ __ ____ _______

?AONTHLYAVG 55.9 74.7 18.8 1345 8.1 8.1 8.0 8.1

.4ONT1-LY HIGH 57.5 76.5 19.1 2486 8.1 8.1 8.0 8.1 MONTHLY LOW 54.2 725 17.0 1239 8.1 8.1 8.0 8.0 MESEXCEEDED NO UMIT NOLUMIT MAX22=0 MAX 2760 0 NO UMIT NOUMIT NO LIMIT NO UMIT MES EXCEEDED M MES EXCEEDED REMARKS: ' NUMBER OF SAMPLES TAKEN DURING THE DAY.

- EXCEPT DURING DEMUSSEUNG.

- DAILY WHEN DISCHARGING CHEMICAL CLEANING WASTES FROM DISCHARGES 001D, F.1.L. AND/OR M.

OVERVIEW

1. During the second quarter of 2003, discharges occurred from Discharge Paths 001 (once through cooling water), 001B, 001D, 001F, 001G, 001H, 001J, 001 L, 001M, 001N, 001P, and 002 through 005. No discharges occurred from Discharge Paths OQIE, 0011, 001K, and 006 through 017. A list of all of the permit discharge pathways, including name and number, is provided in Appendix 1.

2. The substances listed in Table B of the 1990 California Ocean Plan were each analyzed for and reported in the permit renewal application for Diablo Canyon submitted in 1994.

There have been no changes in the activities conducted at the plant that would have significantly affected the results previously reported in the 1994 renewal application.

California Ocean Plan Table B substances that were not analyzed for this quarter were not added to the discharge stream.

3. Unit 1 discharge chlorine monitor had low flow from 2000 on May 25, 2003 through 1200 on May 26, 2003. Proper flow was reestablished after the 1200 injection on May 26, 2003. An engineering evaluation was completed in accordance with PG&E's January 5, 1994, letter as authorized by the CCRWQCB. The calculated value from the engineering evaluation was 27 ppb, well below the 89 ppb Ocean Plan limit.

4. During the second quarter of 2003, system maintenance activities that required draining of closed cooling water systems were performed and are summarized below. PG&E received concurrence from the CCRWQCB in a letter dated July 19, 1995 and another letter dated May 19, 1997(PG&E Letter DCL-95-156 and PG&E Letter DCL-97-533, respectively) regarding the use of glutaraldehyde and isothiazolin to control microbiological growth and corrosion in PG&E's closed cooling water systems.

Discharges are drained at a flow rate such that the chronic toxicity level would be below the "No Observable Effect Concentration" (NOEC) at NPDES Discharge 001.

Date System Volume Glutaraldehyde Isothiazolin I (gal) (mgfl) (mg/I) 4108/03 Unit 2 SCW 50 0 0 4/14/03 Unit I SCW 33,000 0 2.5

SUMMARY

OF MONITORING PROGRAM A. Monitoring of Plant Influent and Effluent

1. The results of the April, May, and June 2003 plant influent and effluent monitoring are reported on Discharge Self Monitoring Report (DSMR) forms in Appendices 2, 3, and 4, respectively.

2. The laboratory report for one acute bioassay on water sampled from Discharge 001, performed April 2 - 6, 2003, is included in Appendix 5. The bioassay results show that acute toxicity was 0.00 (no mortality).

3. The laboratory report for one chronic bioassay on water sampled from Discharge 001, performed April 3 - 5, 2003, is included in Appendix 6. The bioassay results show that chronic toxicity was 1.0 (no chronic toxicity).

l