Text

2008 Annual Report on Discharge Monitoring
	ML090790115
Person / Time
Site:	Diablo Canyon
Issue date:	02/27/2009
From:	Peters K; Pacific Gas & Electric Co
To:	; Office of Nuclear Reactor Regulation, State of CA, Regional Water Quality Control Bd
References
	DCL-2009-507
	Download: ML090790115 (36)
	v • d • e

El Pacific Gas and Electric Company' Diablo Canyon Power Plant P. 0. Box 56 Avila Beach, CA 93424 PG&E Letter DCL-2009-507 February 27, 2009 Electronic Submission PDF Formatted File 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 2008 Annual Report on Discharge Monitoring at Diablo Canyon Power Plant (Enclosure 1).

Facility Name:

Address:

Contact Person:

Job

Title:

Phone Number:

Diablo Canyon Power Plant P.O. Box 56 Avila Beach, CA 93424 Bryan K. Cunningham Supervisor, Environmental Operations 545-4439 Order No. 90-09, NPDES No. CA0003751 WDR/NPDES Order Number:

Type of Report: (check one)

Quarter: (check one):

QUARTERLY 0

ANNUAL 9.l Ist Ii 2nd El 3 rd 11 4 th 11 Year:

2008 (Annual Reports for DCPP are Jan-Dec)

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

see NOTE

[]

No (there are no violations to report)

Note: Reference "Review of Compliance Record and Corrective Actions" Section 0l Yes

PG&E Letter DCL-2009-507 Mr. Briggs February 27, 2009 Page 2 If Yes is marked (complete a-g):

.a) Parameter(s) in Violation:

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

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

e) Dates of Violation(s)

(reference page of report/data sheet):

f) Explanation of Cause(s):

(attach additional information as needed) g) Corrective Action(s):

(attach additional information as needed)

(If "YES", see overview section of attached report)

PG&E Letter DCL-2009-507 Mr. Briggs February 27, 2009 Page 3 I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. The results of the influent and effluent monitoring presented are the observed results of the measurements and analyses required by the monitoring program, and is neither an assertion of the adequacy of any instrument reading or analytical result, nor an endorsement of the appropriateness of any analytical or measurement procedure. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

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

Sincerely,

Title:

Station D' tor - Diablo Canyon Power Plant 2009507/jlk

PG&E Letter DCL-2009-507 Mr. Briggs February 27, 2009 Page 4 cc: w/enclosure PDF Formatted Electronic File Copy:

Regional Administrator U.S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 Director, Division of Reactor Projects U. S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite,400 Arlington, TX 76011-4125 cUL:S:_N ucle-ar-Reg ulatory-Commis-sion7 Document Control Desk Washington, D.C. 20555-0001 California Department of Fish and Game 20 Lower Ragsdale, Suite 100 Monterey, CA 93490 Hardcopy Format:

Resident Inspector, Michael S. Peck U.S. Nuclear Regulatory Commission Diablo Canyon Power Plant 104/5

ENCLOSURE ANNUAL

SUMMARY

REPORT ON DISCHARGE MONITORING-AT THE DIABLO CANYON POWER PLANT I (NPDES NO. CA0003751) 2008

PG&E Letter No. DCL-2009-507 2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant TABLE OF CONTENTS PAGE OVERVIEW

SUMMARY

OF MONITORING PROGRAM A.

Monitoring of Plant Influent and Effluent

1. Monitoring Data

2. Facility Operating and Maintenance Manual

3. Laboratories Used to Monitor Compliance

4. Review of Compliance Record and Corrective Actions B.

Monitoring of Receiving Water

1. Ecological Studies at Diablo Canyon

2. In-Situ Bioassay C.

Sodium Bromide Treatment Program 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 2008 1

1 1

1 2

5 5

5

." 5

2008 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 inciude non-detects and at least one positive result. These less-than results are plotted conservatively at the value. During 2008, discharges occurred from all discharge paths except 0011, 001K, 016, 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 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 PlantlInfluent and Effluent

1. Monitoring Data

a. Appendix 1 provides a list of discharge path names for ease of reference. Appendix 2 contains monitoring data in tabular form. Appendix 3 contains monitoring data in graphical form.

b.

Annual oil and grease analyses were performed in October on Stormwater/Yard Drain Discharges 005, 008, 009, 013, and 015. Results were non-detect (less than 5 mg/I) for discharges 005, 008, 009 and 015. The result for discharge 013 was 5 mg/l. No discharges that resulted in adequate sample quantities occurred from 016 and no discharge occurred from 017 during 2008.

c.

In October, Discharge 001 D (Liquid Radioactive Waste Treatment System) annual grab samples for lithium, boron, and hydrazine were collected and analyzed. The results were 0.058 mg/I, 580 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 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 2008 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)

b.

Aquatic Bioassay Consultants, Ventura, California (Lab Certification # CA01907) 1

c: Creek Environmental, San Luis Obispo, California (Lab Certification # CA00975)

d.

Columbia Analytical Services, Kelso, Washington (Lab Certification # WA00035)

e. TestAmerica, Inc., Earth City, Missouri (Lab Certification # M000054)

Results were also reported from Calscience Environmental Laboratories (CA-ELAP Lab #1230).

These results were from samples taken by Liberty Composting of Bakersfield, CA of sewage treatment sludge received at their facility originating from the DCPP discharge 001 N pathway. The results were provided by Calscience back to the contractor that operates DCPP's sewage treatment unit. The sample results are reported by PG&E as a courtesy, and not used to demonstrate compliance with the annual 001 N pathway sludge analyses required by DCPP's NPDES Permit.

4.

Review of Compliance Record and Corrective Actions

a.

Circulating Water Pump Chlorination/Bromination Monitoring The 2008 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 dischargechlorine limits were not exceeded during these events. An apparent exceedance occurred in February 2008 unrelated to an unmonitored condition (see description below).

Chlorination Cycle Date Monitoring Cause Corrective Action interruptions 7/10/08 to Unit 1 Fouling of monitor's upper Flow block replace and frequency of 7/16/08 37 readings flow block, block inspection/replacement increased.

10/14/08 to Unit 2 Cracked fitting in upper Fitting replaced.

10/15/08 5 readings flow block.

12/18/08 to Unit 1 and 2 Open cross-tie valve between Cross-tie valve closed.

12/19/08 10 readings monitor inlets.

On February 23, 2008, chlorine levels at the Unit-1 discharge monitor reached 207 ppb during the 1600 injection, exceeding the 200 ppb limit in DCPP's NPDES discharge permit. The exceedance was discovered the morning of February 24, 2008. Regional Water Quality Control Board staff were notified the same day, within the 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months notification period. Investigation indicated that maintenance on the main seawater supply piping for the chemical injection system had taken place earlier on February 23rd. Pipe cleaning during the maintenance activity resulted in increased seawater flow within the overall system during the 1600 injection. The increased flow and associated water pressure forced out biofouling material that had accumulated and partially blocked system piping downstream of the conduit 1-1 chemical injection point. The restriction of water flow at this point had generated a build-up of treatment chemical that was suddenly released into the conduit when the blockage broke free.

Fouled system seawater supply piping had been the cause of another exceedance in August 2007 (reported in the third quarter 2007 report). The system maintenance activity on February 23, 2008 was part of the corrective action implemented in response to the August 2007 exceedance.

Unfortunately, chemical treatment operations personnel were not notified that the piping was being cleaned, and the system was being put back in service with potentially enhanced seawater flow. Therefore, measures were not initiated (review chemical injection rate settings, conduct system test injections, increase dechlorination rates, etc.) to adequately evaluate potential change in system conditions, and subsequently mitigate related operational problems. To prevent recurrence, plant procedures have been modified to include notification steps during maintenance activities that could result in enhanced seawater flow. Additionally, preventative maintenance 2.

periodic work orders have been established to remove biofouling throughout the entire'system well before it can cause appreciable pipe occlusion, or contribute to flow restrictions that can result in pockets of chemical accumulation.

c.

Closed Cooling Water Releases During 2008, 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 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 2008 from the component cooling water (CCW),

intake cooling water (ICW), and service cooling water (SCW) systems are presented below. The glutaraldehyde (Glut) and isothiazoline (Iso) concentrations presented in the table below are system concentrations, not concentrations at the point of discharge to receiving water.

Volume Glut so Total Oil &

Reason &

Date System (gal)

(mg/l)

(ag/i)

Suspended Grease Comments Solids (mg/l)

(mg/I) 01/17/08 Unit 2 CCW.

5,300 156 Routine maintenance 01/24/08 Unit 2 SCW 200 92 0.33 Routine maintenance 01/28/08 Unit 2 ICW 1,050

< 50

< 0.25 11.1 3.1 Routine maintenance 01/28/08 Unit 2 SCW 11,000 90 0.33 3.1 1.6 Routine maintenance 01/29/08 Unit 1 ICW 3,308 102 7.3 15.4 3.2 Routine maintenance 02/18/08 Unit 2 SCW 8,000 0.0 0.0

< 2.0

< 1.4 Routine maintenance 03/05/08 Unit 2 SCW 20 297 242 3.4 1.4 Routine maintenance 03/13/08 Unit 2 SCW 33,200 249

< 0.25 3.4 1.4 Routine maintenance 04/12/08 Unit 2 SCW 15 106

< 0.25 Routine maintenance 05/01/08 Unit 1 CCW 181,000 129 0

5.9

< 1.4 Routine maintenance 05/14/08 Unit 1 ICW 200 132 6.0 Routine maintenance 06/05/08 Unit 1 SCW 34,000 144 7.9

< 2.0

< 1.4 Routine maintenance 06/17/08 Unit 1 ICW 3,318

< 50 4.6 Routine maintenance 06/30/08 Unit 2 SCW 15 90 4.3 Routine maintenance 07/03/08 Unit 2 ICW 3,304 153 2.1 Routine maintenance 07/09/08 Unit 2 SCW 33,000 57 4.1

< 0.2

< 1.4 Routine maintenance 07/19/08 Unit 2 CCW 192,500 157 0.0

< 0.2

< 1.4 Routine maintenance 08/25/08 Unit 1 SCW 15 88 0.75 Routine maintenance 09/03/08 Unit 1 SCW 15 85 2.4 Routine maintenance 10/09/08 Unit 2 SCW 10 134 2.8 Routine maintenance

,12/11/08 Unit 1 SCW 33,250 151 5.0

<2.0

<1.4 Routine maintenance

d.

On January 29, 2008, a level switch malfunction caused the turbine building sump to overflow to discharge, bypassing the oily-water-separator. The turbine building watch discovered the sump overflowing to the clean side, and observed pump level switches in normal automatic positions.

Both sump pumps were immediately manually started, terminating flow overboard. However, turbine building sump water that had been directly released bypassed the oily water separator described for this discharge pathway (001 F). DCPP conservatively estimates that a maximum of 25 gpm was released for approximately 18.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months resulting in a bypass of up to 27,750 gallons.

Samples of the water remaining in the turbine building sump indicated that values for oil and grease (19.4 mg/I) and total suspended solids (17 mg/I) were below daily maximum limits for discharge point 001 F. Therefore, this event was-determined to be a bypass and not an exceedance. Regional Water Quality Control Board staff were notified within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of the bypass. Corrective maintenance was performed on the pump switches and satisfactory operation was verified.

e. Shortly after midnight on August 17, 2008, one of three operating Unit 2 main bank electrical transformers failed catastrophically causing a fire. The fire was put out by DCPP emergency 3

responders using water and a protein-based biodegradable, water-soluble, firefighting foam.

Petroleum based electrical insulation oil released from the transformer during the event (estimated at < 100-gallons) was contained within adjacent paved areas, and a large volume oil containment and separation sump installed in the transformer area drainage path. High volumes of deluge water and soluble fire fighting foam additive entered the oil separation sump during the event. Water discharged from the sump flowed to the catch basin of discharge point 004. Foam was subsequently observed in the 004 discharge and in the adjacent power plant intake cove. No obvious petroleum oil sheen was observed at any location. Three oil absorbent booms were deployed, one at the entry to the 004 pathway catch basin, and two at the 004 discharge outlet, to capture any residual oil if transported by water/foam originating from the transformer area. There was a mild kerosene type smell in the foam at the inlet of the drainage catch basin (prior to catch basin outfall to the 004 discharge), but no petroleum type sheen was observed within the catch basin. However, some soot-like material was also observed at this same location. Other than the-foam, the observation of soot-like material and the mild odor were the only notable concerns. Residual fire fighting foam dissipated rapidly once the sun came up, and no oil sheen was observed in the intake cove after all foam was gone.

Regional Board Staff were notified of the event by phone message early Sunday morning (August 17t ) after observations of the catch basin, intake cove, and boom installation. The deployed booms were subsequently examined on Monday August 1 8 th. No petroleum oil was observed in the absorbent material. Additionally, no oil sheen was observed within the drainage catch basin

on the 18 th, or at any location in the intake cove. Follow-up investigation and inspections concluded that during the initial transformer event and subsequent emergency response, the Unit-2 main bank transformer area oil containment and separation sump performed within design function to capture oil and pass water and entrained water soluble materials.

f.

On October 6, 2008, a break in the hydraulic fluid line that controls the paddle wheel on the kelp harvester failed and released a small amount of food grade mineral oil into the Intake Cove.

Operators noticed the leak and immediately returned to the boat dock and shut down the harvester. Hydraulic fluid was observed on the surface of the intake cove as a clear/colorless strip about one foot wide and 100 feet long. The released material did not generate a petroleum oil type multi-colored (rainbow) sheen on the water surface. An absorbent boom was placed around the kelp harvester and absorbent pads were used to clean up the hydraulic fluid. The kelp harvester was removed from the water for repair the same day. It was estimated that approximately one cup reached the water. Central Coast Regional Water Quality Control Board (CCRWQCB) staff were notified the same day and they requested that a brief description be included in the 4 th quarter.report.

g.

A Total Suspended Solids (TSS) minor exceedance for discharge 001 P was discovered on December 15, 2008. The monthly sample for the Seawater Reverse Osmosis (SRO) blowdown (001P) was taken on 12/11/2008 and analyzed on 12/15/2008. The result was 106 mg/I, slightly above the NPDES daily maximum limit of 100 mg/l. Visual inspection of TSS filter residue at the SRO showed much more sand than is typical. It is believed that the sample was taken during a backwash cycle and sock-filters were not operable. Backwash occurs during a very small fraction of the time the SRO is operating. CCRWQCB staff were notified on December 15, the day of discovery, and they requested that additional monitoring be initiated, and a brief description of the event be included in the 4th quarter report. Results of five additional samples were all ND(5). Therefore, the December 2008. monthly average (27 mg/I) was below the monthly average limit (30 mg/I). Evaluation has continued, and temporary engineering controls have been implemented. Details will be provided in the first quarter 2009 monitoring report.

h.

On December 17, 2008, a bypass of the oily water separator occurred for discharge pathway 001 F. The turbine building sump was discovered to have increasing water level with both pumps running to the WHAT facility. Operators were unable to discover where the water was coming from in time to prevent water from overflowing to the outfall, bypassing the oily water separator. It was estimated that the overflow continued for no more than five minutes at a rate of 50 gallons per minute for a total of 250 gallons. It was later discovered that the excessive inflow was water being transferred from a sump in the Unit-1 Turbine Building ReverseOsmosis.

4

(RO) Buttress. The water source was rainwater from the Unit-1 transformer yard area that had entered a piping trench terminating in the Buttress Sump. Water samples were taken from the turbine building sump immediately after the discharge was terminated. Results were as follows:

Oil and Grease - 4.2 mg/I Total Suspended Solids (TSS) - 45.0 mg/I and 41.5 mg/I (2 samples)

Oil and grease sample results were below monthly average and instantaneous maximum limits.

The TSS results from this event were above the monthly average limit of 30 mg/I, but below the instantaneous maximum of 100 mg/l. These two values were averaged with the routine monthly measurements from discharge 001 F for an actual monthly average of 9.0 mg/I, which is below the NPDES monthly average limit of 30 mg/l. Therefore, this event resulted in a bypass, not an exceedance. Operational procedures are being modified to ensure the turbine building sump can handle incoming flow when other sumps are drained. CCRWQCB staff were notified on December 1 7th, the day of the event.

B.

Monitoring of Receiving Water

1. Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2008 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 2008. Results of 2007 RWMP data were submitted to the CCRWQCB on April 25, 2008. A table in Appendix 4 summarizes requirements and completed tasks for 2008.

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 the agency's periodic report for this program.

C. Sodium Bromide Treatment Program 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 February (reference section 4.a). 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-1 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day throughout 2008 with brief interruptions for maintenance activities in January, February, May, June, July, August, and a few times in October.

Both conduits of Unit-2 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day throughout January 2008 with a brief interruption for maintenance activities in mid January. Unit-2 injections were shut down at the beginning of February for the 2R14 refueling outage. Unit-2 injections remained off until early April 2008, when simultaneous injections were restarted. Simultaneous treatment of Unit-2 intake conduits continued through the remainder of 2008 with brief interruptions in May, 'June, August (transformer failure described in Section 4.e.) and October for maintenance activities.

5

APPENDIX 1 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

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Month high low avg MPERATURE (DEG F)

EFFLUENT high low avg DELTA T high avg FLOW (MGD) high low avg JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 54.5 53.8 53.6 50.2 52.2 54.0 56.7 57.8 58.0 58.0 60.6 58.2 51.9 53.4 51.6 52.8 48.8 50.6 47.0 48.6 47.7 50.0 48.6 51.3 51.5 54.1 54.0 55.7 54.4 56.4 52.8 55.1 53.5 56.7 53.1 55.3 74.2 73.0 71.6 67.9 71.0 72.6 75.4 75.6 76.7 76.8 79.5 77.4 71.3 72.5 67.3 70.9 66.7 68.8 59.8 65.1 66.5 68.7 67.2 70.0 70.2 72.8 56.2 69.7 65.5 73.5 65.1 73.1 72.4 75.8 72.4 74.5 20.0 19.1 19.2 18.2 18.9 18.2 18.9 16.5 19.4 18.8 18.9 18.1 18.9 18.7 19.0 14.0 19.2 17.1 19.2 17.9 19.4 19.0 19.4 19.3 2486 2486 2486 2486 1239 1363 1239 1239 1239 2486 1239 2244 2486 1874 2400 2486 2486 2486 2486 2486 2486 2486 1862 2442 2486 2486 2486 2486 1239 2431 2486 2486 2486 2486 2486 2486 limit:

22 2760 The Influent and Effluent "high" and "low" temperture values correspond to the highest and lowest daily average value for that month. The Influent high and low temperature does not necessarily correspond to the same day as the Effluent high and low temperature for that month. The "avg" temperature for Influent and Effluent is the average for the entire month. The Monthly Delta T "high" is the highest Delta T for a day of the month based on daily average Influent and Effluent temperature values. The "Avg" temperature is calculated from Influent and Effluent monthly avg values.

DISCHARGE 001 TOTAL RESIDUAL CHLORINE (daily max. ug/I)

Month high low avp TOTAL CHLORINE USED (lbs/day) high low ave JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 54 207 52 65 41 30 43 39 63 60 36 52 28

<20

<20 21

<10

<10 12 25 43 41

<20 34 15 21 21 19 28 32 27 35 490.

346 230 403 461 547 706 706 677 619 518 547 370 435 156 227 163 197 194 336 202 360 336 475 526 652 408 629 574 629 204 498 496 518 346 484 Note that the residual chlorine limits in Permit CA0003751, Order 90-09, is an instantaneous max of 200 ug/I, and includes a time-based limit (per the Ocean Plan) which depends on the length of the respective chlorination cycle.

Page I of 6

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ug/I)

COPPER CHROMIUM NICKEL

ZINC Month Influent Effluent Influent Effluent Influent Effluent Influent Effluent JAN ND(10)

ND(10)

ND(I0)

ND(10)

FEB ND(10)

ND(10)

MAR ND(10)

ND(10)

APR ND(10)

ND(10)

MAY ND(10)

ND(10)

JUN ND(10)

ND(10)

ND(10) 13 11 ND(10)

ND(10)

JUL ND(10)

ND(10)

AUG ND(10)

ND(10)

SEP ND(10)

ND(10)

ND(I0)

ND(10)

OCT ND(10)

ND(10)

NOV ND(10)

ND(10)

DEC ND(10)

ND(10)

ND(10) 6-month median limit:

10 10 30,

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

Effluent Parameter Influent Effluent Limit Arsenic 1.2 1.2 30 Cadmium 0.027 0.038 10 Cyanide ND(10)

ND(I0) 30 Lead 0.025 0.031 10 Mercury 0.2 0.2 0.2 Silver 0.025 0.025 2.9 Titanium 2.5 none

Phenolic Compounds ND(13.27)

ND(15.12) 150 (non-chlorinated)

- Phenolic Cmpds ND(3.92)

ND(3.75) 10 (chlorinated)

- - PCB's ND(1.59)

ND(I.59) none

Reporting limits shown are the sum of individual Reporting Limits for 7 target compounds.

- Reporting limits shown are the sum of individual Reporting Limits for 6 target compounds.

- - Reporting limits shown are the sum of individual Reporting Limits for 7 target compounds.

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

Month Influent Effluent JAN ND(200)

ND(200)

FEB MAR APR ND(200)

ND(200)

MAY JUN JUL ND(200)

ND(200)

AUG SEP OCT ND(200)

ND(200)

NOV DEC 6-month median limit:

3060 Page 2 of 6

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY pH (averages)

Discharge:

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

Month high av2 JAN 19 10 FEB ND(5)

ND(5)

MAR ND(5)

ND(5)

APR ND(5)

ND(5)

MAY ND(5)

ND(5)

JUN ND(5)

ND(5)

JUL ND(5)

ND(5)

AUG ND(5)

ND(5)

SEP ND(5)

ND(5)

OCT ND(5)

ND(5)

NOV ND(5)

ND(5)

DEC ND(5)

ND(5) limit:

20 15 SUSPENDED SOLIDS (mg/I) high ave 17 16 7

7 16 12 16 16 14 13 14 14 18 18 11 10 6

6 5

5 6

45 100 6

9 30 Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average Limits.

DISCHARGE 001N (Monthly Summary of Weekly Data)

Month JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC limit:

GREASE & OIL (mg/I) high low ave 10 ND(5)

<5 8

ND(S)

<5 ND(5)

ND(5)

ND(5) 7 ND(5)

<5 8

ND(5)

<5 8

ND(5)

<5 ND(5)

ND(5)

ND(5) 7 ND(5)

<5 ND(5)

ND(5)

ND(5) 20 15 hip-h 50 60 34 37 12 32 23 36 42 20 27 35 SUSPENDED SOLIDS (mg/I) low av2 15 29 25 40 11 21 t0 22 7

10 ND(5) 14 7

16 14 27 ND(5) 20 14 16 16 21 17 26 60 SETTLEABLE SOLIDS (ml/l) hieh low av=

ND(0.1)

ND(0.1) 0.3 ND(0.1)

<0.1 ND(0.1)

ND(0.1)

ND(0.1) 0.2 ND(0.11

<fl.1

-j 3.0 1.0 Page 3 of 6

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant Note: "high" limits based upon Daily Maximum limits. "avg" limits based upon Monthly Average limits.

DISCHARGE 001D, H, L, F, METALS (avg. ug/l) 001D 001 H 001L 00IF Month Ag Cd Cr Cu Ag Cd Cr Cu At!

Cd Cr Cu Ag Cd Cr Cu JAN ND(10)

ND(10)

ND(10) ND(10) 20 27 ND(10) ND(10) ND(10) ND(10) 25 ND(10)

ND(10)

FEB MAR APR ND(10)

ND(10)

ND(10) 10 ND(10) ND(10) 21 69 ND(10) ND(10) ND(10)

<10 ND(10)

ND(10)

ND(10) 38 MAY JUN JUL ND(10)

ND(10)

ND(10) 40 67 ND(10) ND(10) ND(10) ND(10)

ND(10)

AUG SEP OCT ND(10)

ND(10)

ND(10) ND(10) 19 62 ND(10) ND(10)

ND(10)

ND(10) 23 ND(10)

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 O01D, H 001 H 001 D

[,L, F, METALS (avg. ug/l) 0011L Zn Hg Ni Pb Zn

<10 ND(O.20) ND(10) ND(10) ND(10)

Month Hg Ni Pb Zn Hg Ni Pb JAN ND(0.20)

ND(10)

ND(10) 46 ND(0.20) 18 50 FEB MAR APR ND(0.20)

ND(10)

ND(10) 155

<0.20 16 ND(10)

MAY JUN JUL ND(0.20)

ND(10)

ND(10) 58 ND(0.20)

24 ND(10)

AUG SEP OCT ND(0.20)

ND(10)

ND(10) 174

<0.20 22 ND(10)

NOV DEC limit: none Note: 001D, 001H and 00IL analyses performed on quarterly composites.

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

ND(10)

<10 12 ND(0.20)

<10 ND(10)

ND(10)

ND(0.20) ND(10) ND(10)

ND(10)

ND(0.20) ND(10) ND(10)

ND(10) 001F Hg Ni Pb Zn ND(0.20) ND(10) 39 49 ND(0.20) 20 ND(10) 28 ND(0.20) ND(10) ND(10)

ND(10)

ND(0.20) 33 ND(10) 42 Page 4 of 6

2008 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 FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

<5 ND(5)

ND(5)

<5 ND(5)

ND(5) 6 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 ND(5) 6

<5 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 ND(5)

ND(5)

<5 5

ND(5)

<5

<5 ND(5)

ND(5) 5 5

ND(5) 5 ND(5)

ND(5)

<5 ND(5) 6 ND(5)

ND(5)

ND(5) 7 9

ND(5)

ND(S)

ND(5)

ND(S)

ND(5)

ND(5) 5 ND(5) 27 ND(5)

ND(5)

Limit:

30 30 30 30 30 30 30 30 30 30

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

Note: No discharges occurred from 0011 and 001K during 2008.

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 001.1 001K 001L 001M 01 P 002 003 004 JAN

<5 FEB MAR ND(5)

ND(5)

ND(S)

ND(5)

ND(5).

ND(5)

APR MAY JUN JUL AUG SEP OCT NOV DEC 8

ND(5)

<5 ND(5)

ND(5)

<5 S

ND(5)

ND(5) 10 ND(5)

ND(5)

Limit:

15 15 15 15 15 15 15 15 15 15 15 15

Discharges from 001D are batched. Monthly averages are f1ow weighted.

Note: No discharges occurred from 0011 and 001K during 2008.

Page 5 of 6

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING (toxicity units, tIa and tuj)

ACUTE Test 6-Month Result Median

CHRONIC Test Result Month JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 0.00 0.00 0.00 0.00 0.41 0.00 0.00 0.00 1.0 1.0 1.0 1.0 0.00 0.00 0.23 0.00 6-month median limit:

0.26 5.1 This parameter is monitored for the State Ocean Plan instead of the NPDES Permit. A value of 1.0 indicates no chronic toxicity.

NOTE:

Increased acute toxicity testing in January, February and March were due to acute tests in the 4th quarter of 2007 that reported mortalities. The additional tests were negative for toxicity.

DISCHARGE W1N ANNUAL ANALYSES Sludge Parameter Percent Moisture Total Kjeldahl Nitrogen Ammonia (N)

Nitrate (N)

Total Phosphorus pH Oil and Grease Boron Cadmium Copper Chromium Lead Nickel Mercury Zinc Volume Result 99%

720 mg/kg 170 mg/kg ND(I) mg/kg 140 mg/kg 6.9 96 m/kg 20 mg/kg ND(0.3) mg/kg 4.6 mg/kg ND(0.5) mg/kg ND(I) mg/kg ND(0.5) mg/kg ND(0.04) mg/kg 8 mg/kg I fc Limit None None None None None None None None Io XSTLC*

I0 X STLC 10 X STLC IOX STLC 0 X STLC I0 X STLC I0 X STLC 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

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Temperature (CF)

Average -O---LI 90.0-80.0 70.0 -

60.0 50.01 40.0-30.0 4 20.0 4 10.0 0.0 JAN FEB MAR APR I

I MAY JUN JUL AUG SEP OCT NOV DEC 2008 90.0 80.0-70.0o 60.0 50.0 40.0 30.0 20.0 10.0 0.0 DISCHARGE 001 EFFLUENT Temperature (*F)

High

-- 0'-Average

-- O-Low JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Page 1 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flow (MGD) 2008 3000 25001 0

I C

2000 -

IN 1500 1 1000 -

500+

-*HighI

-*Averagel LOWI t*

V I

I I

i 1

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 DISCHARGE 001 EFFLUENT Monthly Delta T ('F) 25 20, A.

15 +

10+

5 0

Limit High Average JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Page 2 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Total Chlorine Residual, ug/1 250-200 150 100-50',

0-JAN Hi-.-

lgh

-- 4"-Average Law FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001 Total Chlorine Used, pounds per day 800 High Average 700 a

Low 600 0500

~400 1300 a00 200 100-0 4-JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Page 3 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper (monthly average, ug/h) 12 T 10 8-S6-F 0

EffnluentI 2

A A

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 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, ugh1) 35 30 25 20 15

-hInfluentI 10-5-

0 I

I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 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

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Zinc (monthly average, ug/l) 80 -

60-50 30 -

-hInfluentl 20 +

10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

12 DISCHARGE 001 Chromium (monthly average, ug/l) 101 8 -

4-2 -

...h..InfluentI U.5.

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 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

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant pH 8.2 8.1 8.0 7.9 7.8 S7.7 7.6 7.5 7.4 7.3 7.2 4-JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Several data points on this chart overlap.

Discharge 001 Ammonia (as N, ug/l) 3500-3000:

2500-2000-1500-1000-500-0 6-Month Median Limit A

Influent Effluent A

A JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 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.

Page 6 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F Oil & Grease (Maximum, mg/l) 25.0 20.0 15.0 10.0 5.0 Daily Maximum Limit -Monthly Average Limit 0-Sample Result (Maximum) 0.0 4 6

6 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001F Suspended Solids (Maximum, mg/i) 120 1001 80 -

60-N Daily Maximum Limit

-- O-Monthly Average Limit S-4 Sample Result (Maximum) 40A 20 0

0 0

0 JAN FEB MAR APR MAY JUN JUL AUG 2008 SEP OCT NOV DEC Note: Maximum values are plotted.

Page 7 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001N Oil & Grease(mg/l) 25 20

_15 10 5

Daily Maximum Limit

-O-Monthly Average Limit

-A-- High

-*-Average 06 4

4 A

0 0

"2*

111 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Values plotted at zero were below the reporting limit.

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

70 Average 60 50

-40 t 3 0 20 10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 DISCHARGE 001N Setleable Solids (ml/l) 3.5 -

31 2.5 1.5 1

0.5

-- i--Daily Maximum Limit Monthly Average Limit A-High U.

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 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

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D Quarterly Metals (ug/l) 10 T 9

8 6-a5 0 Silver M Cadmium E Chromium E Copper I

3 2

1 0

I I

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001D Quarterly Metals (ugil) 200 180 160 140 120 a

100 80 60 40 20 0

[ Nick~el 0 Lead EZincI JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 9 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F Quarterly Metals (ug/1) 40T 35 +

30 +

25 20 15 10-5-

0 I

I 0" Silver E Cadmium 0 Chromium 0 Copper JAN FEB MAR APR MAY JUN JUL AUG SEP OCT 2008 NOV DEC Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001F Quarterly Metals (ug/1) 140 -

120+

100+

80-604-

[] Mercury E Nickel N Lead

Zinc 40+- I 20 0

1I HI

-I I

I I

I~I I

I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page lOofl5

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001H Quarterly Metals (ug/l) 80 70 60 50

~40 30 20 10 n

0 Silver N Cadmium E Chromium 0 Copper I

-J JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001H Quarterly Metals (ug/l) 60 50 40 4b30 20 10 0

o Mercury E Nickel 0 Zinc JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 11 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001L Quarterly Metals (ug/l) 30 25 20 t15 10 5

0 0 Silver E Cadmium 0 Chromium E Copper I

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001L Quarterly Metals (ug/1) r' Mercury ENickel M Lead 11Zm 10 9

8 7

6 4

3 2

1 0

I I

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 12 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/1) 35 30 25 20 15 10 5

0 J

35 30 25 20 15 10 5

0 J

35 30 25 S20 15 10 5

0 J

-Monthly Average Limit

-- OID

--+k'-001G 0111G A

AN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DE(

2008 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/I)

Monthly Average Limit A

001J

-0001M IAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DE(

2008 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/1)

-- I--Monthly Average Limit

@0011'

-"'4"--OIL 2--0-00 M

TOA S

N O

(Aeae mg/i)

AN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

Page 13 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY OIL & GREASE (Average, mg/i) 16 14-1411001D 12 --

1111111110 I

10 0o 1H 8 --

Monthly Average Limit 6-4 2

0 L

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 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 14

-oo1J 1111111001.1 12 --

1111111110 1 10 001M

-a-Monthly Average Limit 6

4 2

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Values plotted at zero were below the reporting limit.

QUARTERLY OIL & GREASE (Average, mg/1) 16 14 12 --

op 10oo 8--~

6 --

a-aMonthly Average Limit 4 --

2 --

iI I

0 I

I I

I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: Values plotted at zero were below the reporting limit.

Page 14 of 15

2008 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY (6-Month Median) 6.0 5.0 Chronic Bioassay Results

~ 4.0 -

0-- 6-mo. Median Acute Limit 3.0 7

-"--Acute Bioassay Results

-U Chronic Limit 2.0 Acute 6-month Median 1.0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2008 Note: High acute 6-month median value in January due to positive test results in late 2007.

Page 15of15

APPENDIX 4

SUMMARY

OF RWMP MONITORING FOR 2008 RWMP 1st Survey 2nd Survey 3rd Survey 4th Survey Stations/

Completion Completion Completion Completion Surveys Stations/

Stations/

Study per Year Dates Dates Dates Dates Horizontal Band Transects 14 / 4x Feb 6 Jun 4 Aug 29 Dec 8 Vertical Band Transects 5 I 4x.

Feb 7 Jun 5 Aug 29 Nov 14 Benthic Stations 8 / 4x Apr 2 Jun 20 Sep 17 Dec 11 Fish Observation Transects 12 / 4x Apr24 Jul16 Sep 29 Dec 22 Bull Kelp Census

- /fx Oct 28 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).

/

F_

M

DCL-2009-507, 2008 Annual Report on Discharge Monitoring

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