DCL-2007-508, Annual Report for 2006 on Discharge Monitoring at Diablo Canyon Power Plant

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Annual Report for 2006 on Discharge Monitoring at Diablo Canyon Power Plant
ML070660578
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 02/27/2007
From: Becker J
Pacific Gas & Electric Co
To:
Office of Nuclear Reactor Regulation, State of CA, Central Coast Regional Water Quality Control Bd
References
CA0003751, DCL-2007-508
Download: ML070660578 (39)
v • d • e


Text

`7ý Pacific Gas and Electric Company Diablo Canyon Power Plant P0. Box 56 Avila Beach, CA 93424 800.545.6000 Certified Return/Receipt Date: February 27, 2007 1 #7005-0390-0003-1611-7991 PG&E Letter DCL-2007-508 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 2006obnDischarge'Monitoring at Diablo Canyon Powdr:Plant(Enclosure 1).

Facility Name: Diablo Canyon Power Plant Address: P.O. Box 56 Avila Beach, CA 93424 Contact Person: Bryan K. Cunningham Job

Title:

Supervisor, Environmental Operations Phone Number: 545-4439 WDR/NPDES Order Number: Order No. 90-09, NPDES No. CA0003751 Type of Report: (check one) QUARTERLY ANNUAL El []

1St

  • 3rd th Quarter: (check one): 2nd 4

[] El El 1-Year: 2006 (Annual Reports for DCPP are Jan-Dec)

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

  • see NOTE El No (there are no violations to El Yes report)
  • NOTE: Please see "Review of Compliance Record and CorrectiveActions" section

_::T-E-2-S

PG&E Letter DCL-2007-508 Mr. Briggs February 27, 2007 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 LimitlCondition:

e) Dates of Violation(s)

(reference page of report/data sheet):

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

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

(attach additional information as needed)

PG&E Letter DCL-2007-508 Mr. Briggs February 27, 2007 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, concerns, or require additional information, please contact Bryan Cunningham at (805) 545-4439.

Sincerely, Name: James R. Becker

Title:

Vice President - Diablo Canyon Operations and Station Director 2007508/J LK~kmo

PG&E Letter DCL-2007-508 Mr. Briggs February 27, 2007 Page 4 cc: Peter von Langen, 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, Terry Jackson 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) ... ._

2006

PG&E Letter No. DCL-2007-508 2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant TABLE OF CONTENTS PAGE OVERVIEW 1

SUMMARY

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

1. Monitoring Data 1 2.. FacilityOperating 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 5
1. Ecological Studies at Diablo Canyon 5
2. In-Situ Bioassay 5 C. Sodium Bromide Treatment Program 6 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 2006 ENCLOSURE 2 - Errata Information

2006 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 (ND or non-detect) are plotted as a "zero" value in accordance with ELAP guidance. Less-than results are typically reported to express an average of values that include non-detects and at least one positive result. These less-than results are plotted conservatively at the value. During 2006, discharges occurred from all discharge paths except 0011, 001 K, 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 January 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 documents.

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 November on Stormwater/Yard Drain Discharges 005, 008, 009, 013, and 015. Results were less than 5 mg/I for discharges 005, 009 and 013. Results for discharges 008 and 015 were both 6 mg/l. No discharges that resulted in adequate sample quantities occurred from 016 and no discharge occurred from 017 during 2006.
c. InNovember, Discharge 001D (Liquid Radioactive Waste Treatment System) annual grab samples for lithium, boron, and hydrazine were collected and analyzed. The results were less than 0.010 mg/I, 118 mg/I, and 0.005 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 The following laboratories were used during 2006 for monitoring compliance. They are certified under the appropriate agencies for the test/analyses they perform. As part of the on-going annual certification process, these laboratories take part in, and have passed, annual quality performance evaluation testing.
a. PG&E Chemistry Laboratory, DCPP, Avila Beach, California (Lab Certification # CA01036) 1
b. Aquatic Bioassay Consultants, Ventura, California (Lab Certification # CA01907)
c. FGL Environmental, Santa Paula, California (Lab Certification # CA00140)
d. Creek Environmental, San Luis Obispo, California (Lab Certification # CA00975)
e. Columbia Analytical Services, Kelso, Washington (Lab Certification # WA00035)
f. SevernTrent Laboratories, Earth City, Missouri (Lab Certification # M000054)
4. Review of Compliance Record and Corrective Actions
a. Circulating Water Pump Chlorination/Bromination Monitoring The 2006 quarterly NPDES reports discuss chlorination cycles when discharge monitoring was interrupted. These are listed below with brief descriptions of the cause and corrective action.

When these monitoring interruptions occurred, engineering evaluations (approved by the CCRWQCB January 13, 1994; PG&E Letter No. DCL-94-002) were performed. Detailed descriptions of these evaluations are included in the quarterly reports. Evaluations concluded that discharge chlorine limits were not exceeded during these events. An apparent exceedence occurred in December 2006 unrelated to an unmonitored condition (reference section 4.j.).

Chlorination Cycle .

Date Monitoring Cause Corrective Action interruptions I 12/30/05 Unit 1 Sample flow restricted by Debris removed and to 01/05/06 28 readings storm-related debris monitor recalibrated.

01/12/06 Unit 1 Monitor vendor-related Calibration corrected.

1 reading calibration error.

01/12/06 Unit 1 and Unit 2 Cross-tie in sample piping Valve closed. Procedure to 01/18/06 72 readings left open after weekly flush. revised to minimize probability of recurrence.

03/27/06 Unit 1 Air supply to monitor Air supply to mixing to 21 readings mixing chamber restricted chamber restored.

03/30/06 by biological growth.

05/18/06 Unit 1 Sample flow restricted due Fouled section of to 05/25/06 41 readings to biological fouling, instrument replaced 05/19/06 Unit 2 Calibration problem during Monitor recalibrated.

to 05/25/06 47 readings post-outage start-up.

07/20/06 Unit 1 Plankton fouling of the Replaced monitor flow to 35 readings sensor. block, and increased 07/27/06 piping flush frequency.

08/10/06 Unit 1 - 2 readings Low reagent Replaced reagent 08/10/06 Unit 2 - 1 reading Calibration problem Recalibrated monitor 10/19/06 Unit 2 - 1 reading Air entrained in sample line Recalibrated monitor during calibration

b. Closed Cooling Water Releases During 2006, maintenance activities that required draining of closed cooling water systems were performed and are summarized below. PG&E received concurrence from the CCRWQCB in response to letters dated July 19, 1995 (PG&E Letter DCL-95-156), May 23, 1996 (PG&E Letter DCL-96-522), and May 19,1997 (PG&E Letter DCL-97-533) regarding the use of glutaraldehyde and isothiazolin to control microbiological growth and corrosion in DCPP's closed cooling water systems. Any drainage from these systems is discharged at a flow-rate 2

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 2006 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 at the point of discharge to receiving water.

Volume Glutaraldehyde Isothiazoline Reason &

Date System (gal) (mg/I) (mg/I) Comment 02/22/06 Unit 1 SCW 15,151 67 0.4 Routine maintenance 02/23/06 Unit 1 SCW 17,850 67 0.4 Routine maintenance 03101/06 Unit 1 ICW 3,100 224 4.1 Routine maintenance 04/18/06 Unit 2 ICW 1,150 224 2.7 Routine maintenance 05/04/06 Unit 2 SCW 24,000 140 4.4 Routine maintenance 07/20/06 Unit 1 SCW 33,000 100 3.2 Routine maintenance 08/17/06 Unit 1 ICW 3,300 201 2.8 Routine maintenance 09/08/06 Unit 2 SCW 33,000 157 6.0 Routine maintenance 09/15/06 Unit 1 SCW 60 55 1.0 Routine maintenance 09/19-20/06 Unit 1 CCW 180,300 215 0.0 Routine maintenance 10/05/06 Unit 2 CCW 182,100 196 0.0 Routine maintenance c.- Injections-of-sulfur. hexafluoride-(SF6)-.

Injections of sulfur hexafluoride (SF6) into DCPP's condensers were performed to detect saltwater leaks during this year. CCRWQCB's Sorrel Marks concurred during conversations held in May 1996 that periodic use of SF6 would not increase DCPP's probability of exceeding NPDES permit limitations. Injections during 2006 are summarized below.

Number of Duration Injection Rate of SF6 Total SF6 Injected Date Injections (sec) (Standard Cubic Feet per Minute) (Cubic Feet) 01/14/06 7 30 10 35 10/16/06 2 30 10 10 10/30/06 12 30 5 30 11/01/06 11 30 10 55

d. January On January 12, 2006, chemical drain tank 0-2 (CDT 0-2) was discharged. A sample from the tank was analyzed using hexane extraction to measure oil and grease content. The result was 26 mg/L of hexane-extractable material. This value apparently exceeded the monthly and daily limits (15 mg/L and 20 mg/L, respectively) for oil and grease for discharge pathway 001 D.

However, the result is believed to be a false positive due to the presence of liquid scintillation (LS) solution in the CDT and the sample. Prior to extraction, it was identified that the sample had a whitish tint. This tint is believed to have been caused by a small amount of waste LS solution that had entered the tank during rinsing of residue from bulk solution containers before disposal. The practice of segregating the waste LS solution for separate disposal has been used since May 2005 when LS solution was found to give false positive results from samples extracted with hexane to measure oil and grease. Five CDT samples had been extracted using the hexane method subsequent to May 2005, with no results greater than 9 mg/L, and the improved laboratory processes for managing LS solution were believed to have eliminated.the potential for biased positive .results. However, rinsing of empty bulk containers was not specifically addressed, and the 26 mg/L value is believed to be a result of this practice.

Permanent postings were subsequently installed in the Chemistry laboratory to prohibit rinsing of any container that contained LS solution into the CDTs. During the remainder of the quarter, eight follow-up samples were taken and analyzed using the hexane extraction method. The highest result of these follow-up samples was 5.1 mg/l. Regional Water Control Board staff 3

were notified on January 19, 2006 regarding the CDT 0-2 issue, and correspondence regarding the LS solution was forwarded on February 21, 2006.

e. March During routine preventative maintenance on March 29, 2006, the discharge temperature recorder for Unit 2 was found to be high out of tolerance. The recorder was adjusted and retested. Subsequent data was within specifications. A review of historical temperature data indicated that the recorder may have been out of tolerance since the end of the Unit 1 refueling outage (early December 2005). Since that time Unit 2 discharge temperatures have averaged about 2 degrees F above Unit 1 values. Therefore, actual discharge temperatures and differential temperatures were slightly lower than the values that had been reported for December 2005 and for January, February and March of 2006. The reported values are slightly inaccurate in a conservative direction, therefore there were no exceedences of NPDES temperature limits.
f. April On April 17, 2006 condensate from Unit 2 was discharged overboard via point 001J during shut down of the unit for routine maintenance. The monthly samples for suspended solids and oil and grease from this discharge were missed due to human error on the part of the technician responsible for collection of the samples. The cause of this error has been evaluated, and implementation of comprehensive measures to prevent recurrence is in progress. The daily maximum concentraItion limits for suspended sb6iidsand oil aindgrease discharged from 001 J-are 100 mg/L and 20 mg/L, respectively. Samples were taken from Unit 2 001J at the next available opportunity on May 20, 2006. Analysis results were below the 1.4 mg/L detection limit for oil and grease, and less than the 5 mg/L reporting limit for suspended solids. There is no operational reason to believe that analysis results would have been higher if samples had been taken from the water discharged on April 17, 2006.
g. May Starting on May 17, 2006 firewater was inadvertently discharged via 001 E due to a leaking valve. The firewater was being used to cool the service cooling water heat exchanger. The butterfly valve on the heat exchanger was not completely sealing off flow, and an estimated 15 gpm of firewater leaked past the valve for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Total volume discharged was approximately 64,800 gallons over the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Water that is normally discharged via 001 E is pure water with corrosion inhibitors and biocides added. The firewater was clean freshwater with no corrosion inhibitors and no biocides. Firewater is a routine component of 001 discharge.
h. July On July 27, 2006 a pipe leading from the seawater reverse osmosis unit burst along the roadway leading up to the raw water storage reservoirs, sending freshwater into Discharge Path 006. Upon discovery, active measures were taken to prevent erosion and sediment from entering the storm water drainage ditch and ocean outfall. Flow was stopped and the pipe was repaired by the end of the day on July 28. It is estimated that a maximum of 2,000 gallons of freshwater was released. The description in the NPDES permit includes only rainwater for Discharge 006. Even though the released water was pure freshwater, technically it is not rainwater and Regional Water Quality Control Board staff were notified on July 28, 2006.
i. October In late October and early November 2006, DCPP replaced a check valve in the outfall pipe of discharge 001 H, discharge for the High Conductivity Tank (HCT). This required re-routing the 001 H waste water (after normal filtration and neutralization processes) to the dirty side of the turbine building sump. From there the water flowed through the oily-water-separator and overboard via 001 F. This process did not change the character of HCT waste water. The HCT 4

discharge (001 H re-routed through the 001 F outfall) continued to comply with NPDES permit limitations. This temporary re-route was discussed with CCRWQCB staff prior to initiating the work and written concurrence for the re-route was received on October 18, 2006. As requested by CCRWQCB staff, volumes of water discharged through this temporary re-route were documented and are listed below.

10/25/06 22,732 gallons 10/31/06 22,156 gallons 11/02/06 22,156 gallons Total: 67,044 gallons

j. December On December 15, 2006 during the 4:00 AM routine chlorination of the circulating water tunnels for Unit 1, the discharge chlorine monitor momentarily spiked up from a steady reading of 46 pg/L to an instantaneous peak of 97 pg/L, then immediately dropped back down to the 46 pg/L level. The total residual oxidant instantaneous maximum for Discharge 001 per DCPP NPDES Permit Order 90-09 is 200 ug/L. However, the calculated discharge limit in accordance with the California Ocean Plan is 89 pg/L. CCRWQCB staff were notified of the incident by telephone on December 15, 2006. Subsequent investigation determined that the most probable cause of the, event was an electrical disturbance in the discharge monitor 120-Volt AC power supply. The Unit 1 discharge monitor was inspected following discovery of the recorded spike and found to be operating normally and within calibration limits.. Unit 1 chemical injection cycles subsequent to the 4:00 AM treatmient displayed expected residdaalchl6rinbe c6ncentrations in the 40-50 dg/L range. Condenser waterbox chlorine monitors recorded normal oxidant curves during the 0400 treatment with no indications of a chemical concentration spike ruling out momentary excess chlorine injection at the seawater system intake. The post condenser dechlorination system was found to be operating within normal parameters with no indications of chemical flow restriction, feed pump volume or pressure loss, significant power supply disruption, or any other evidence of equipment operational anomaly. Furthermore, the chemical injection system is designed to trip-off in the event of a significant equipment fault. No system trip occurred. In response to this event, the electric power system to the discharge monitors and associated recording equipment is being equipped with an in-line uninterruptible power supply (UPS) reserve battery unit with continuous voltage and amperage output conditioning.

B. Monitoring of Receiving Water

1. Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2006 under the Receiving Water Monitoring Program (RWMP) as requested. in a letter from the Central Coast Regional Water Quality Control Board (CCRWQCB) dated December 9, 1998, and as detailed in a letter from PG&E dated January 8, 1999 (DCL-99-503). This program includes tasks from the Ecological Monitoring Program (EMP) with additional stations and increased sampling frequencies. This program replaces the EMP and the Thermal Effects Monitoring Program (TEMP). Several one-year-only tasks outlined in the above letters were completed in 1999 and were not requested to be performed in 2006. Results of 2005 RWMP data were submitted to the CCRWQCB on April 28, 2006. A table in Appendix 4 summarizes requirements and completed tasks for 2006. The second replicate of the fourth survey of Fish Observation Transects was completed for only three out of twelve stations due to unfavorable ocean conditions from December 2006 through January 2007.
2. In Situ Bioassay Results of the Mussel Watch Program are reported to the CCRWQCB directly by the California Department of Fish and Game in their periodic report for this program.

5

C. Sodium Bromide Treatment Prociram DCPP continued its integrated sodium bromide and "foul release coating" strategy to control macrofouling in the Circulating Water System (CWS). The treatment program consists of six 20-minute injections (at four hour intervals) of a blend of generic sodium bromide and sodium hypochlorite into DCPP's seawater intake conduits. Each injection attempts to achieve a target concentration of 200 parts per billion (ppb) Total Residual Oxidant (TRO) at the inlet waterbox of the main condensers. Discharge TRO, measured at the plant outfall, remained below NPDES limitations, except for one reading in December (reference section 4.j). Typically, discharge values were between 20 ppb to 50 ppb. In conjunction with the chemical treatment, untreated portions of the cooling water system were previously painted with a non-toxic "foul release coating" to reduce or prevent attachment of fouling organisms.

Both conduits of Unit I were treated throughout the first three quarters of 2006 with simultaneous injections of sodium bromide and sodium hypochlorite six times a day. There were brief interruptions in late July, August, and September due to a flow alarm system trip, depletion of sodium bromide chemical stock due to supply delays, and piping maintenance activities. Both conduits of Unit 1 continued the simultaneous injection treatment through October 2006. Sodium bromide injections were shut down in early November in preparation for a Unit 1 tunnel cleaning.5 Sodium hypochlorite injections to the Unit 1 main conduits were maintained until November 21s when the Unit 1 injection system was secured for the tunnel cleaning. Simultaneous injections of sodium bromide and sodium hypochlorite were restarted in late November after completion of the tunnel cleaning. Thiere was one other brief interruption in the Urhit-'1treatment schedule in early December when a Unit 2 circulating water pump automatically shut down.

Both conduits of Unit 2 were treated throughout the first quarter of 2006 with simultaneous injections of sodium bromide and sodium hypochlorite six times a day until late March when sodium bromide injections were turned off in anticipation of the 2R1 3 refueling outage. Microfouling injections of sodium hypochlorite continued six times a day until mid-April when all Unit 2 injections were terminated for the start of 2R1 3. Simultaneous injections of sodium bromide and sodium hypochlorite six times a day were initiated shortly after the middle of May once the circulating water pumps were returned to service. This treatment schedule continued throughout the remainder of 2006 with brief interruptions in late July, August, September, and mid-December due to a flow alarm system trip, depletion of sodium bromide chemical stock due to supply delays, piping maintenance activities, storm wave induced condenser cleaning, a circulating water pump 2-1 shut down, and a tunnel cleaning for the 2-1 conduit.

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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

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 MPERATURE (DEG F) FLOW (MGD)

INFLUENT EFFLUENT DELTA T Month high low avg high low avg high avg high low av, JAN 57.0 52.6 54.5 77.1 72.1 74.2 20.1 19.7 2486 2486 2486 FEB 55.1 51.3 52.9 74.8 70.6 72.5 19.9 19.5 2486 2486 2486 MAR 54.9 50.1 52.1 74.8 70.0 72.0 20.3 19.8 2486 2486 2486 APR 56.5 50.7 53.5 75.5 68.7 72.3 19.4 18.8 2486 1239 1927 MAY 55.7 49.3 51.6 71.3 62.7 68.7 19.1 17.1 2486 1239 1624 JUN 53.5 49.9 51.7 72.0 67.5 70.2 18.9 17.9 2486 2486 2486 JUL 58.5 50.3 53.9 77.1 68.8 72.5 18.8 18.6 2486 2486 2486 AUG 58.6 53.1 55.6 77.2 71.8 74.1 19.0 18.5 2486 2486 2486 SEP 58.7 52.4 55.8 77.5 71.2 74.7 19.5 18.8 2486 2486 2486 OCT 59.1 55.2 57.6 78.2 74.3 76.6 19.4 19.0 2486 2486 2486 NOV 58.5 53.9 55.5 77.6 73.2 74.6 20.0 19.2 2486 1899 2430 DEC 58.3 53.4 55.5 75.8 71.2 73.7 19.4 18.2 2486 1732 2324 limit: 22 2760

-The INFLUENT and EFFLUENT "high" and "low" temperture values correspond to the highest and lowest daily average value for.that month.. The -

INFLUENT high and low temperature does not necessarily correspond to the same day as the EFFLUENT high and low temperature for that month. The "avg" temperature for INFLUENT and EFFLUENT is the average for the entire month. The Monthly Delta T "high" is the highest Delta T for a day of the month based on daily average INFLUENT and EFFLUENT temperature values. The "Avg" temperature is calculated from INFFLUENT and EFFLUENT monthly avg values.

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

Month high low avgI r[t high I

low avgI I

JAN 64 <10 51 605 360 465 FEB 60 <10 28 461 360 392 MAR 60 <10 34 504 353 404 APR 42 <10 25 547 187 316 MAY 55 <20 28 475 173 283 JUN 66 13 31 533 403 484 JUL 73 <10 41 667 446 538 AUG 73 <10 35 864 619 745 SEP 60 <10 20 922 511 686 OCT 87 <10 40 922 677 747 NOV 87 <7 37 734 288 533 DEC 97 7 36 655 410 573 Note that the residual chlorine limits in Permit CA0003751, Order 90-09, is a daily max of 200 ug/l and includes a time-based limit (per the Ocean Plan) which depends on the length of the respective chlorination cycle.

Page I of 6

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ug/l)

CHROMIUM COPPER NICKEL *ZINC Month Influent Effluent Influent Effluent Influ ent Effluent Influent Effluent JAN ND(10) ND(10) ND(10) ND(10) 10 11 ND(10) ND(10)

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

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

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

MAY ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

JUN ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 59 ND(10)

JUL ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

AUG ND(10) ND(10) ND(10) ND(10) 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)

OCT 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(10) ND(10) ND(10) ND(10) ND(10) ND(10) 6-month median limit: 10 10 30 70

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

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

Effluent Parameter Influent Effluent Limit Arsenic 1.5 1.5 30 Cadmium 0.03 0.03 10 Cyanide ND(10) ND(10) 30 Lead 0.02 0.05 10 Mercury ND(0.0010) ND(0.0010) 0.2 Silver 0.02 0.02 2.9 Titanium - 10 none

  • Phenolic Compounds ND(11.82) ND(11.82) 150 (non-chlorinated)
    • Phenolic Cmpds ND(3.36) ND(3.36) 10 (chlorinated)
      • PCB's ND(1.59) ND(1.59) none
  • Reporting limit [ND(I1.82)1 shown is the sum of individual Reporting Limits for 8 target compounds.
    • Reporting limit [ND(3.36)] shown is the sum of individual Reporting Limits for 6 target compounds.
      • Reporting limit [ND(1.59)] shown is the sum of individual Reporting Limits for 7 target compounds.

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

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

FEB MAR APR ND(200) ND(200)

MAY JUN JUL ND(200) ND(200)

AUG SEP OCT ND(200) ND(200)

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

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY pH (averages)

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

Month high avg high ave JAN ND(5) ND(5) 10 10 FEB ND(5) ND(5) 5 5 MAR ND(5) ND(5) 13 13 APR ND(5) ND(5) 12 11 MAY ND(5) ND(5) 6 6 JUN ND(5) ND(5) ND(5) ND(5)

JUL ND(5) ND(5) 11 11 AUG ND(S) ND(S) 9 8 SEP ND(5) ND(5) 11 10 OCT ND(5) ND(5) 22 21 NOV ND(5) ND(5) 18 17 DEC ND(5) ND(S) 13 12 limit: 20 15 100 30 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average Limits.

DISCHARGE 001N (Monthly Summary of Weekly Data)

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

Month high low avg high low avg high low avg JAN ND(5) ND(5) ND(5) 33 5 14 ND(0.1) ND(0.1) ND(0.1)

FEB ND(5) ND(5) ND(5) 10 ND(5) 7 ND(0.1) ND(0.1) ND(0.1)

MAR ND(5) ND(5) ND(5) 18 ND(5) 8 ND(0.1) ND(0.1) ND(0.1)

APR ND(5) ND(5) ND(5) 28 12 18 ND(0.1) ND(0.1) ND(0.1)

MAY ND(5) ND(5) ND(5) 56 24 40 ND(0.1) ND(0.1) ND(0.1)

JUN ND(5) ND(5) ND(5) 10 5 8 ND(0.1) ND(0.1) ND(0.1)

JUL 6 ND(5) <5 27 6 13 ND(0.1) ND(0.1) ND(0.1)

AUG ND(5) ND(5) ND(5) 14 7 10 0.1 ND(0.1) <0.1 SEP ND(5) ND(5) ND(5) 26 8 18 0.1 ND(0.1) <0.1 OCT ND(5) ND(5) ND(5) 14 6 10 ND(0.1) ND(0.1) ND(0.1)

NOV ND(S) ND(5) ND(5) 16 10 13 ND(0.1) ND(0.1) ND(0.1)

DEC ND(5) ND(5) ND(5) 20 15 18 ND(0.1) ND(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.

Page3 of 6

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D, H, L, F, METALS (avg. ug/l) 001D 001 H 001L 001F Month Ag Cd Cr Cu A2 Cd Cr Cu A2 Cd Cr Cu A2 Cd Cr Cu JAN ND(1) ND(10) ND(10) ND(10) ND(2) ND(10)- 17 42 ND(1) ND(10) ND(10) ND(10) ND(1) ND(10) 27 12 FEB ND(1)

MAR APR ND(10) ND(10) ND(10) 13 ND(10) ND(10) 16 55 ND(10) ND(10) ND(10) 13 ND(10) ND(10) 15 ND(10)

MAY JUN JUL ND(10.0) ND(10) ND(10) ND(10) ND(10.0) ND(10) 21 38 ND(10.0) ND(10) ND(10). ND(10) ND(10.0) ND(10) ND(10) ND(10)

AUG ND(10)

SEP OCT ND(10) ND(10) ND(10) 10 ND(10) ND(10) 20 30 ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 18 NOV DEC limit: none Note: 001D, 001H and 001L analyses performed on quarterly composites. 001F analyses performed quarterly on a composite of weekly samples.

DISCHARGE 001D, H, L, F, METALS (avg. ug/1) 001D 001 H 001L 001F Month Hg Ni Pb Zn Hg Ni Pb Zn Hg Ni Pb Zn Hg Ni Pb Zn JAN ND(0.2) ND(10) ND(10) 67 ND(0.2) 17 ND(10) 10 ND(0.2) ND(10) ND(10) <10 ND(0.2) 19 ND(10) 22 FEB ND(0.2)

MAR APR ND(0.20) ND(10) 35 236 0.27 17 ND(10) 17 ND(0.20) ND(10) ND(10) ND(10) ND(O.20) 11 ND(10) 17 MAY JUN JUL ND(0.20) ND(10) ND(10) 214 0.23 16 ND(10) <10 ND(O.20) ND(10) ND(10) ND(10) ND(0.20) 10 ND(10) 22 AUG ND(0.20)

SEP OCT ND(0.20) ND(10) ND(10) 109 ND(0.20) 18 ND(10) 11 ND(0.20) ND(10) ND(10) ND(10) ND(0.20) 15 ND(10) 33 NOV DEC limit: none Note: 001D, 001H and 061L analyses performed on quarterly composites, except for mercury (due to holding time).

001F analyses performed quarterly on a composite of weekly samples.

Page 4 of 6

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS Averages (mg/I)

Month . 001D* 001G 001H 0011 001J 001K 001L 001M 001P 002 003 JAN <5 ND(5) ND(5) ND(S) ND(5) 5 17 FEB <5 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

MAR <5 ND(S) ND(5) ND(5) ND(5) 6 7 APR <5 ND(5) ND(5) ND(5) ND(S) ND(5) ND(5) ND(5)

MAY 7 ND(5) 6 ND(S) ND(5) ND(5) ND(5) 5 JUN <5 5 ND(5) ND(5) ND(5) ND(5) 5 JUL <5 ND(5) 8 ND(5) ND(5) ND(S) 7 AUG <5 ND(5) ND(5) ND(S) ND(S) ND(5) 14 <5 9 SEP <5 ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

OCT <5 ND(S) ND(S) ND(5) 5 11 ND(5)

NOV <5 ND(S) 10 ND(5) ND(5) ND(5) 8 DEC <5 ND(5) ND(5) ND(S) ND(S) 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 2006.

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

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

Month 001D* 001G 001H 0011 001J 001K 001L 001M 001P 002 003 004 JAN <5 ND(5) ND(5) ND(S) ND(5) ND(5) ND(5) ND(5)

FEB <5 MAR ND(S)

APR ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5) ND(5)

MAY <5 ND(5)

JUN ND(5)

JUL ND(5) ND(5) ND(5) ND(S) ND(5) ND(5) ND(5) ND(5)

AUG <5 ND(5) ND(5)

SEP ND(5)

OCT <5 ND(S) ND(S) ND(5) ND(5) ND(5) ND(5) ND(5)

NOV <5 ND(S)

DEC ND(5) ND(S)

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 2006.

Page 5 of 6

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING (toxicity units, tua and tue)

ACUTE *CHRONIC Test 6-Month Test Month Result Median Result JAN FEB 0.00 0.00 1.0 MAR APR MAY 0.00 0.00 1.0 JUN JUL AUG 0.00 0.00 1.0 SEP OCT NOV 0.00 0.00 1.0 DEC 6-month median limit: 0.26 5.1

  • 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 Kjeldahl Nitrogen 580 mg/kg None Ammonia (N) 95 mg/kg None Nitrate (N) ND(1) mg/kg None Total Phosphorus 210 mg/kg None pH 6.7 None Oil and Grease 6 mg/kg None Boron ND(3) mg/kg None Cadmium ND(0.3) mg/kg 10 X STLC*

Copper 3 mg/kg 10 X STLC Chromium ND(0.5) mg/kg 10 X STLC Lead ND(1) mg/kg 10 X STLC Nickel ND(0.5) mg/kg 10 X STLC Mercury ND(0.04) mg/kg 10 X STLC Zinc 7 mg/kg 10 X STLC Volume 0.76 tons None Note: Annual samples were collected in October.

  • STLC = Soluble Threshold Limit Concentration Page 6 of 6

APPENDIX 3 GRAPHICAL SUMMARIES OF INFLUENT AND EFFLUENT MONITORING

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Temperature(IF) 90.0 80.0 70.0 60.0 Ga 50.0 I-Ga 40.0 30.0 High 20.0 -- 4-"Average 10.0 -- o-'0Low 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 DISCHARGE 001 EFFLUENT Temperature (fF) 90.0 80.0 70.0 60.0 3!g Ga. 50.0 ---..--- Averag I-40.0 30.0 20.0 10.0 0.0 JA*N FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Page 1 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flow (MGD) 3000 2500 C4 2000

  • 1500 o 1000 500 0 ii I i I I I I i I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 DISCHARGE 001 EFFLUENT Monthly Delta T (If) 25 20 v 15 10

-ULimit 5- -- High 0 Average 0 ! i i i I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Page 2 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001

-High Total ChlorineResidual, ug/

120 4 Average 100 Low 100 60 40 20 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001 Total Chlorine Used, pounds per day 1000 900 800 700 600

  • "500 S400 a,300 200 100 0-JAN FEB MAR APR MAY JUN JUL AUG SEP OCT, NOV. DEC 2006 Page3 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper (monthly average,ug/l) 12 10 T M5 - l - F I

n 8

4-

-A-Influent 2 +-Effluent 0 A A A A JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting 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 Copper is 50 ug/l.

DISCHARGE 001 Nickel (monthly average,ug/1) 35 30 E n - N- - -

25 20 &I Influent]

15-10 5

0 B 3 3 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting 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/Il.

Page 4 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Zinc (monthly average,ug/l) 80 70 60

-W- Limit 50 A Influent S40 - Effluent 30 20 N a A A I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001 Chromium (monthly average,ug/l) 121 10 8

4 I-&.-Influentl

$[ flen~t 2

0 p p JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 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. The daily maximum limit for chromium is 40 ug/l.

Page 5 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant pH 8.2 8.1 8.0 7.9 7.8 0.

7.7 7.6 7.5 7.4 7.3 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Several data points on this chart overlap.

Discharge 001 Ammonia (as N, ug/l) 3500 T 3000 M Ill 2500 2000 1500 - U- 6-Month Median Limit 1000 ---A Influent Effluent 50 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Influent and Effluent values overlap at four points on this plot.

Page6of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F Oil & Greaqe (Maximum, mg/i) 25.0 t 7211.UN s= 9" - Ism 20.0 15.0

-U Daily Maximum Limit 10.0

-- 0--Monthly Average Limit 0 Sample Result (Maximum) 5.0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001F Suspended Solids 11n (Maximum, mg/l) 100 80

-U- Daily Maximum Limit

- Monthly Average Limit

} 60

'- Sample Result (Maximum)

' I 40 20 o0 T i i I i i i i i I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Maximum values are plotted. The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 7 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001N Oil & Grease(mg/l) 25T 20 E--

15 M Daily Maximum Limit 10 -- -- Monthly Average Limit A High 5

  • Average 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit.

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

DISCHARGE 001N Suspended Solids (mg/l) 70T 60 50 40 a30 20 10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001N Setleable Solids (mill) 3.5 -

3:

2.5 - - Daily Maximum Limit

- Monthly Average Limit 2 A High .

1.Z1 - Average 3-- 3 3 -- - - -- ---

0.5 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit. -

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

Page 8 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D Quarterly Metals (ug/l) 14 -

12 10

[3 SilverV 0 Cadmium 8 0 Chromium M Copper 6

4 2

0 F... I I I I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001D Quarterly Metals (ugil) 25(0 20(0 ONickel E.Lead 150 E]Zinc M]Mercury 100 50 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 9 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F 30 Quarterly Metals (ug/l) 25 20 0 Silver

~15- 13 Chromium

I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001F QuarterlyMetals (ug/l) 140 120 100 80 [5Mercury ENickelj 60 ElLeadj 40 20 0

WA

] [ t I* I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 10 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001H QuarterlyMetals (ug/l) 60 50 40 13 Silver 20 NCadmium E]Chromium IICopper 10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001H Quarterly Metals (ug/l) 20 18 16 14 12 MNickel r0MLead Mercury 8

M]Zinc 6

4 2

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page11 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001L Quarterly Metals (ug/l) 14 12 10 8

0 Silver ,

6 E Cadmium M Chromium SCopper I 2-0V I I I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001L Quarterly Metals (ug/l) 12 10 8

E3 Mercury N Nickel InLead E]Zinc 2 -

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 12 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS 35 (Average, mg/i)

I 25 -@--Monthly Average Limit

-- 20 ooID 00*-

001G---O0G 15 --0-001H JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS 35 (Average, mg/..)

30E 25 --- Monthly Average Limit A 001i

- 20

-G-0-01M 10 06 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/i) 35T 30 "

25 -U- Monthly Average Limit

.& 001P 20 4--- 002 10 5

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

Page13 of 15

2006 Annual Summary Report on Discharge Monitoring at the -

Diablo Canyon Power Plant QUARTERLY OIL & GREASE (Average, mg/I) 16.-

14 mlm001Di 12 i001G 10 ýo-n00tH

}8 -r-Monthly Average Limit 6

4 2

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit. Less than values are plotted at the value.

QUARTERLY. OIL & GREASE (Average, mg/I) 16 0 I ' " I - I -- I I I - ' I[ -

.14 12~ 1ý001j 12 001L 10 *' mOGIM

-rn-Monthly Average Limit 6

4 2

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 10 2006 _ O01M Note: Values plotted at zero were below the reporting limit.

QUARTERLY OIL & GREASE (Average, mg/I) 16 ... ........ .. ... . . . . .

14 12 001P 002 10 - - 003 004 6 - Average Limit a-Monthly 4

2 0 I I , I -- I - ,

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Note: Values plotted at zero were below the reporting limit.

Page14 of 15

2006 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY 6.0 T m

  • 5.0 -

Chronic Results o 4.0 - 6-mo. Median Acute Limit A-Acute Results 3.0 ---- Chronic Limit o 2.0 1.0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2006 Page 15 of 15

APPENDIX 4

SUMMARY

OF RWMP MONITORING FOR 2006 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 / 4x Jan 28 May 19 Jul 28 Dec 20 Vertical Band Transects 5 / 4x Jan 31 Jun 14 Aug 11 Dec 7 Benthic Stations 8 / 4x Mar 31 Jun 12 Aug 28 Nov 20 Fish Observation Transects 12 I 4x May 5 Jul 28 Oct 4 Jan 15 07 Bull Kelp Census */ lx. Oct 4 Temperature Monitoring 24 / ** Jan-Mar Apr-Jun Jul-Sep Oct-Dec

  • Diablo Cove census.
    • Temperature measured throughout the year at 20 minute intervals (14 intertidal and 10 subtidal stations).

The second replicate of the fourth survey of Fish Observation Transects was completed for only 3 out of 12 stations due to poor ocean conditions from December 2006 through January 2007.

ENCLOSURE 2 ERRATA 2006 NPDES DISCHARGE MONITORING REPORTS FOR DIABLO CANYON POWER PLANT ERRATA: November 2006 temperature and flow averages were reported incorrectly. The following table summarizes the reported values and the correct values.

Reported Correct Parameter Value Value Influent Average Temperature 53.7 55.5 Influent Average Temperature 72.2 74.6 Delta T Average Temperature 18.6 19.2 Flow (MGD) 2352 2430 The attached monitoring report page [PAGE: (M) 1] should replace the original November monitoring data page contained in the fourth quarter NPDES report PG&E letter DCL-2007-501, dated January 19, 2007.

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

CONTROL BOARD DIABLO CANYON NUCLEAR POWER PLANT CENTRAL COAST REGION PO BOX 56 895 AEROVISTA PLACE, SUITE 101 AVILA BEACH, CALIF 93424 SAN LUIS OBISPO, CA 93401 PAGE: (M) 1 FACIUTY I.D. YEAR I MO/DAY YEAR / MO / DAY STATE CODE NPDES PERMIT #

3402003001 BEGINNING 06 / 11 / 01 ENDING 06 / 11/ 30 06 CA0003751 STATION INFLUENT EFFLUENT 001 DELTATEMP EFFLUENT 001 INFLUENT EFFLUENT001 EFFLUENT 001P EFFLUENT002 ANALYSIS TEMPERATURE TEMPERATURETEMPERATURE FLOW pH

  • pH pH pH UNITS DEGREES F DEGREES F DEGREES F MGD pHUNITS pHUNITS pHUNITS pHUNITS SMPLTYPE METERED METERED METERED RECORDED GRAB GRAB GRAB GRAB FREO. CONTINUOUS CONTINUOUS CONTINUOUS DAILY MONTHLY MONTHLY () MONTHLY MONTHLY 1 58.4 77.4 19.0 2486 2 7.7 2 8.0 2 58.5 77.6 19.1 2486 3 58.1 77.3 19.2 2486 4 56.6 75.7 19.1 2486 5 56.8 75.7 18.9 2486 6 57.4 76.2 18.8 2486 7 57.1 75.9 18.8 2486 8 56.1 74.9 18.8 2486 9 54.4 73.3 18.9 2486 10 54.7 73.7 19.0 2486 11 54.5 73.6 19.1 2486 12 54.6 73.7 19.1 2486 13 55.0 74.2 19.2 2486 14 55.3 74.5 19.2 2486 7.9 7.9 15 54.3 73.5 19.2 2486 16 54.6 73.7 19.1 2486 17 54.1 73.2 19.1 2486 18 54.6 73.6 19.0 2486 19 55.2 74.2 19.0 2486 20 55.3 74.5 19.2 2486 21 55.5 74.7 19.2 2486 22 55.8 75.1 19.3 2486 23 55.5 74.8 19.3 2486 24 54.9 74.3 19.4 2486 25 54.4 73.9 19.5 2486 26 54.3 73.8 19.5 2486 27 55.3 74.3 19.0 1899 28 54.9 74.3 19.4 1925 29 53.9 73.9 20.0 1965 30 54.1 73.8 19.7 2486 31 MONTHLY AVG 55.5 74.6 19.2 2430 7.9 7.9 7.7 8.0 MONTHLY HIGH 58.5 77.6 20.0 2486 7.9 7.9 7.7 8.0 MONTHLYLOW 53.9 73.2 18.8 1899 7.9 7.9 7.7 8.0 lIMES EXCEEDED NO UMIT NO UMIT MAX22 = 0 MAX2760 0 NO LIMIT NO UMIT NO UMIT NO UMIF TIMES EXCEEDED (**

TIMES EXCEEDED REMARKS: NUMBER OF SAMPLES TAKEN DURING THE DAY.

EXCEPT DURING DEMUSSEUNG.

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

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