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

{{Adams
| number = ML070660578
| issue date = 02/27/2007
| title = Annual Report for 2006 on Discharge Monitoring at Diablo Canyon Power Plant
| author name = Becker J
| author affiliation = Pacific Gas &amp; Electric Co
| addressee name = 
| addressee affiliation = NRC/NRR, State of CA, Central Coast Regional Water Quality Control Bd
| docket = 05000275, 05000323
| license number = 
| contact person = 
| case reference number = CA0003751, DCL-2007-508
| document type = Annual Operating Report, Environmental Monitoring Report, Letter type:DCL
| page count = 39
}}

=Text=
{{#Wiki_filter:`7&#xfd;    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 hours. Total volume discharged was approximately 64,800 gallons over the 72 hours. 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.
6

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
* Cadmium
 ~15-                                                                                                              13 Chromium
* Copper 10       I' 5-A 0
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                                                                                                &#xfd;o-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~                                                                      1&#xfd;001j 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.}}