DCL-2008-511, 2007 Annual Report on Discharge Monitoring at Diablo Canyon Power Plant

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2007 Annual Report on Discharge Monitoring at Diablo Canyon Power Plant
ML080660337
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 02/27/2008
From: Becker J
Pacific Gas & Electric Co
To:
Office of Nuclear Reactor Regulation, State of CA, Central Coast Regional Water Quality Control Bd
References
CA0003751, DCL-2008-511
Download: ML080660337 (37)
v • d • e


Text

PacificGas and Electric Company Diablo Canyon Power Plant PO. Box 56 AMila Beach, CA 93424 800.545.6000 PG&E Letter DCL-2008-511 . Certified ReturnlReceipt

  1. 7007-0220-0004-6736-0116 February 27, 2008 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 2007 Annual Report on Discharge Monitoring at Diablo Canyon Power Plant (Enclosure 1).

Facility Name: Diablo Canyon Power Plant Address: P.O. Box 56 Avila Beach, CA 93424 Contact Person: 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 MR Quarter: (check one): 1 st 2nd 3 rd 4 th El 1:1 11 El Year: 2007 (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 Corrective Actions" section

PG&E Letter DCL-2008-511 Mr. Briggs February 27, 2008 Page 2 If Yes is marked (complete a-g):

a) Parameter(s) in Violation:

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

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

e) Dates of Violation(s)

(reference page of report/data sheet):

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

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

(attach additional information as needed)

PG&E Letter DCL-2008-511 Mr. Briggs February 27, 2008 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,ý 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.

Sincere Name: James R. Becker

Title:

Vice President - Diablo Canyon Operations and Station Director 2008511/JLK

PG&E Letter DCL-2008-511 Mr. Briggs February 27, 2008 Page 4 cc: Peter von Langen, CCRWQCB (Cover Only) 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, Michael S. Peck 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 76011-4005 Director, Division of Reactor Projects U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Dr., Suite 400 Arlington, TX 76011-4005 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) 2007

PG&E Letter No. DCL-2008-511 2007 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. Facility Operating and Maintenance Manual 1
3. Laboratories Used to Monitor Compliance 1
4. Review of Compliance Record and Corrective Actions 2 B. Monitoring of Receiving Water 6
1. Ecological Studies at Diablo Canyon 6
2. In-Situ Bioassay 6 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 2007 ENCLOSURE 2 - Errata, Information

2007 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 2007, discharges occurred from all discharge paths except 001 I, 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 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 October on Stormwater/Yard Drain Discharges 005, 008, 009, 013, and 015. Results were less than 5 mg/I for discharges 009, 013 and 015.

Results for discharges 005 and 008 were 11 mg/I and 5 mg/I, respectively. No discharges that resulted in adequate sample quantities occurred from 016 and no discharge occurred from 017 during 2007.

c. In October, Discharge 001D (Liquid Radioactive Waste Treatment System) annual grab samples for lithium, boron, and hydrazine were collected and analyzed. The results were less than 0.200 mg/I, 123 mg/I, and less than 0.003 mg/I, respectively.
2. Facility Operatinq and Maintenance Manual PacificGas 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 2007 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.

1

a. PG&E Chemistry Laboratory, DCPP, Avila Beach, California (Lab Certification # CA01036)
b. Aquatic Bioassay Consultants, Ventura, California (Lab Certification # CA01 907)
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)
4. Review of Compliance Record and Corrective Actions
a. Circulating Water Pump Chlorination/Bromination Monitoring The 2007 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 August 2007 unrelated to an unmonitored condition (see description below).

Chlorination Cycle Date Monitoring Cause Corrective Action interruptions 05/12/07 Unit 2 Power to chlorine monitoring Chlorine injection stopped until 1 reading system was interrupted, monitor power restored.

06/27/07 to Unit 1 Shift of monitor calibration Monitor recalibrated after 07/03/07 36 readings after 6/27/07 scheduled identification of conservative maintenance, bias.

07/03/07 to Unit 1 Faulty air pump on monitor. Pump replaced.

07/11/07 48 readings 08/02/07 to Unit 1 and Unit 2 Valve mis-positions. Procedure revised.

08/03/07 6 readings each Unit 08/28/07 Unit 2 Valve mis-position. Procedure revised.

1 reading 09/14/07 to Unit 1 Sample line blockage. Line flushed.

09/15/07 2 readings On August 14, 2007 the 0000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> reading on the Unit 1 discharge chlorine monitor reached a maximum of 114 ppb. This value is below the NPDES limit of 200 ppb. However, it is above the calculated effluent limit of 89 ppb from the California Ocean Plan for intermittent 20-minute chemical treatments. Investigation indicated that a strainer at the intake supplying seawater to the injection lines had become significantly fouled with shell debris allowing chemical to accumulate in the line. When the valve was flushed, the accumulated chemical was flushed through the line into the 1-1 conduit resulting in increased levels of chlorine at the discharge.

Upon discovery, injection rates were decreased and dechlorination was initiated. The strainer was manually cleaned the following day. Injection seawater supply has returned to normal levels. CCRWQCB staff were notified the afternoon of August 14, 2007. Long term actions included increasing the frequency of strainer flushing and scheduling cleaning of seawater supply lines and the flush line (scheduled for February and March 2008 during refueling outage 1R14).

b. Closed Cooling Water Releases During 2007, maintenance activities that required draining of closed cooling water systems were performed and are summarized below. PG&E received concurrence from the CCRWQCB in 2

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 2007 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 JIso Total Suspended Oil &

Grease Reason &

Date System (gal) (mgll) (mg/I) Solids (mg/I) (mg/I) Comment 01/03/07 Unit 1 ICW 200 164 <0.25 -- - Routine maintenance

/I 01/26/07 Unit 2 SCW 33,000 191 <0.25 7.1 4.0 Routine maintenance 02/21/07 Unit 2 ICW 3,300 171 <0.25 12.2 <1.4 Routine maintenance 03/07/07 Unit 1 ICW 3,307 137 6.7 35.0 4.5 Routine maintenance 04/30/07 Unit 1 ICW 1,100 <50 <0.25 12.3 4.4 Routine maintenance 04/30/07 Unit1 SCW 11,000 <50 <0.25 17.1 1.5 Routine maintenance 05/09/07 Unit 1 CCW 9,920 186 <0.25 3.8 2.6 Routine maintenance 05/15/07 Unit 1 CCW 25 173 <0.25 - -- Routine maintenance 05/19/07 Unit 1 CCW 1,451 186 <0.25 - - Routine maintenance 05/31/07 Unit 1 ScW 33,499 222 <0.25 19.7 4.4 Routine maintenance 06/07/07 Unit 2 SCW 33,300 <50 4.4 2.6 3.1 Routine maintenance 06/30/07 Unit 2 SCW 80 67 4.4 - -- Routine maintenance 07/20/07 Unit 1 ICW 48 254 <0.25 -- -- System Leakage 08/06/07 Unit 2 ICW 33,214 201 1.93 6.4 2.0 Routine maintenance 07/12/07 to Unit 1 ICW 111 175 1.8 -- -- System Leakage 08/17/07 08/22/07 Unit 1 ICW 3,313 108 1.8 9.8 3.1 Routine maintenance 09/05/07 Unit 1 ICW 15 246 <0.25 -- -- Routine maintenance 10/02/07 Unit 2 ICW 15 167 0.7 .... Routine maintenance 10/17/07 Unit 2 ICW 10 97 0.7 .... Routine maintenance 10/23/07 Unit 2 SCW 330 59 <0.25 ..-- Routine maintenance 10/29/07 Unit 1 ICW 5 228 7.6 .... Routine maintenance 11/11/07 Unit 2 SCW 100 109 3.4 -- - Routine maintenance 11/18/07 Unit 1 SCW 33,100 202 3.4 2.7 3.3 Routine maintenance 11/20/07 Unit 1 ICW 10 60 7.6 -- -- Routine maintenance 11/20/07 Unit 2 SCW 33,100 78 <0.25 17.2 2.9 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 2007 are summarized below.

Number of Duration Injection Rate of SF6 Total SF6 Injected Date Injections (sec) (Standard Cubic Feet per Minute) (Cubic Feet) 01/29/07 8 30 10 40 3

d. Discharge 001N - Sewage Treatment Plant Discharge On Thursday, 6/14/07, the weekly sample for settleable solids was taken from the sewage treatment plant (Discharge 001 N). The sample was delivered to the certified contract laboratory on Friday 6/15/07. Analysis of the sample could not be performed until Sunday, 6/17/07 because appropriate laboratory personnel were unavailable. Therefore, the sample was analyzed approximately 24-hours after the end of the 48-hour maximum holding time. The result of the analysis was below the 0.1 mil/L reporting limit (non-detect). Due to the nature of settleable solids as an analyte, it is unlikely that the result was significantly affected by the extended holding period. Discussion regarding the late analysis were held with the sewage treatment system operator and the contract laboratory manager. Sampling times have been adjusted to avoid necessity for Friday sample deliveries to the off-site laboratory.

On June 21, 2007, the weekly sample from the sewage treatment plant (Discharge 001 N) was taken and delivered to the off-site contract laboratory for analysis (Creek Environmental). The sample was analyzed on June 22"d, and reported to contain 3.9 ml/L of settleable solids. The maximum discharge concentration for this parameter from Pathway 001 N in DCPP's NPDES permit is 3.0 ml/L. Upon receiving the analysis result from the contract laboratory on July 2, 2007, DCPP contacted the Regional Board and reported the apparent exceedance. Regional Board Staff (von Langen) waived the 5-day report and requested that a description of the event be included in the Discharge Monitoring Report for the second quarter 2007.

Settleable solids are typically non-detect (ND) (<0.1 ml/L) in samples taken from the sewage system effluent. Samples are obtained from the bucket of the system decanting apparatus. This is a conservative location for sampling the pathway because it is upstream of the lift station cistern, where mixing and dilution by previously-decanted fluid occurs.

Results for settleable solids samples taken in the two weeks prior to June 21, (June 8th and June 14 th) were 0.1 ml/L and ND respectively. The result for the sample subsequent to June 21 (on June 2 7 th) was ND again. The monthly average limit for settleable solids in 001 N effluent is 1.0 ml/L. The monthly average limit was approached but not exceeded for June inclusive of the 3.9 ml/L laboratory result obtained from the June 21't sample.

The system operator performs at least two samples in sequence each week during a decant phase. One sample is analyzed on-site to assess real-time system performance, and the second sample sent to a qualified off-site laboratory. The result for on-site analysis of the sample taken at 09:15 on June 2 1 st was 2.5 ml/L settleable solids. However, this analysis is not recognized as a formal result because it is not conducted by a certified laboratory. The second sample taken at 09:17 was delivered to a contract laboratory certified to perforýn the analysis by the State Environmental Laboratory Accreditation Program (ELAP). The 3.9 ml/L settleable solids result of that analysis is the value reported for the pathway.

The June 21"' samples were taken as sewage plant operation was in a transitional period to a more typical processing rate after a plant refueling outage when sewage system flows are significantly increased. A potential system anomaly that could result from substantial sewage flow reduction is described below in the background information. No other system changes or events were identified as potential contributing factors to the June 2 1 st laboratory result. No system operating condition or equipment issue has been identified that would have generated excess settleable solids in the decanting aqueous phase. System pumps, aeration equipment, and electrical/mechanical equipment logic controls showed no evidence of failure. Operational logs for the facility did not evidence significant unusual conditions previous to, or immediately after, the June 21st sampling period.

Background information regarding the DCPP sewage treatment system:

Liquid sewage influent undergoes a 90-minute aeration within a cement treatment tank.

Aeration is followed by a 60-minute settling period. Following settling, a decanting arm slowly pivots down to allow the separated aqueous phase to flow-out over a 90-minute period. Settled 4

solids in the treatment tank can then be pumped to a sludge holding tank if required. Solids transfer to the sludge holding tank is accomplished both automatically and manually. An automatic transfer of solids occurs once daily; typically lasting for 10-minutes and occurring at the end of a settling period. The sewage treatment plant operator may elect to perform additional manual transfer to maintain suspended solids in a 3,000-3,500 mg/L target band during aeration steps. These manual transfers are intended to optimize aerobic (oxygenated) bacterial digestion of the sewage undergoing treatment. During periods when average sewage flow is significantly increasing or decreasing, the system operator may need to make adjustments of the daily sludge transfer rate to maintain target operating ranges.

Following the settling phase, effluent flows into the decanting bucket of the pivot arm and is then gravity fed to a pumping station cistern. The pumping station lifts accumulated effluent within the cistern which then flows by gravity to the 001 N discharge point. The 001 N pathway discharges into, and is combined with, DCPP's main cooling water circulating system flow prior to final outfall through the 001 discharge. Effluent from the sewage treatment system is therefore significantly diluted prior to final outfall from the power plant to receiving waters.

Prolonged suspension of solids during the settling phase can occur if conditions that inhibit normal settling exist. One such set of conditions includes an unusually high bacterial population and relatively vigorous anaerobic (non-oxygenated) bacterial digestion within the solid phase.

Vigorous anaerobic digestion within the sludge could generate off-gassing at a rate sufficient to keep pushing a portion of the solids back up into the aqueous layer. It is believed that this type of scenario may have caused the isolated event on June 21 st, 2007. However, that has not been conclusively determined.

.Significant changes of the system bacterial population can occur during transitions from a relatively high rate of processing to lower, more routine, operational volumes. Such circumstances take place following refueling outages at DCPP when augmented plant staffing is rapidly reduced, i.e., the plant population is reduced by more than one fourth within a single week. Essentially, the bacterial population established during heavy sewage influx is subjected to reduced nutrient availability, causing the population equilibrium to shift to a new state. Such a shift has potential to produce a significant anaerobic system condition that may be accompanied by gaseous disturbance of the settled solids. Such events are not routine, and would only occur when variant conditions (temperature, bacterial population density and composition, bacterial nutrient mixture, influent chemical composition) combined to create an environment favorable for such an event. Such conditions in a frequently aerated treatment system would be considered off-normal, and anticipated to be short term in duration.

e. Acute Bioassay Mortalities - 4 th Quarter 2007 Laboratory reports showed apparent toxicity for effluent in two acute bioassays. Three acute bioassays were performed on water sampled from Discharge 001 on October 25-29, 2007, December 6-10, 2007, and December 14-18, 2007. The October bioassay results indicated possible toxicity with one mortality in the 100% solution. Therefore a second test was run on a sample taken on December 5, 2007. The second test result indicated additional toxicity.

However, results were suspect because one 100% tank had 5 mortalities and the other 100%

tank had none. A third test on DCPP effluent, sampled on December 13, 2007, indicated no toxicity. Based on the results of the three tests, the six month median is 0.41 (95% survival) which exceeds DCPP's 0.26 acute toxicity limit. Toxicity tests are considered valid if control survival is above 90%. Therefore, the first test result was within the standard range for acceptable survival levels, yet it still exceeded the limits set forth in DCPP's NPDES permit (Order 90-09). One valid mortality would cause exceedance of this limit. In discussions with laboratory staff and Regional Water Quality Control Board staff, it was agreed that these positive test results were likely anomalies and not true indications of effluent toxicity. The validity of this conclusion is supported by the results of the chronic toxicity test, a far more sensitive test, that did not indicate any toxicity for the October water sample. The acute toxicity median value of 0.41 resulting from inclusion of these test results is therefore suspect, and actual effluent toxicity exceedance highly unlikely.

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B. Monitoring of Receiving Water

1. Ecological Studies at Diablo Canyon Marine ecological monitoring was continued during 2007 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 2007. Results of 2006 RWMP data were submitted to the CCRWQCB on April 28, 2007. A table in Appendix 4 summarizes requirements and completed tasks for 2007. The second replicate of the fourth survey of Fish Observation Transects was completed for six out of twelve stations due to unfavorable ocean conditions from December2007 through January 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 August (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 through mid-April 2007 with brief interruptions due to check valve and discharge monitor maintenance. On April 2 0th, sodium bromide injections were shut down, while sodium hypochlorite injections continued until April 2 7 th when Unit 1 main conduit chemical treatment was secured for the 1R14 refueling outage. Simultaneous injections were restarted May 2 4 th and ran through the rest of 2007 with brief interruptions for maintenance activities in mid-August, late September, late October, early November and early December (conduit 1-1 only).

Both conduits of Unit 2 were treated with simultaneous injections of sodium bromide and sodium hypochlorite six times a day throughout the first quarter with a brief interruption due to check valve maintenance. Unit 2 injections were shut down on March 30 in preparation for a Unit 2 tunnel cleaning thatrd started th in early April. Injections were restarted after tunnel cleaning completion on April 3 and 5 . Simultaneous injections of sodium hypochlorite and sodium bromide continued for Unit 2 the remainder of 2007 with brief interruptions due to maintenance activities in April, May, mid-August, late September,. late October, early November and early December.

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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

2007 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 hiMh low avg high avp hiph low avo JAN 55.0 52.7 53.8 73.9 71.6 72.8 19.7 19.0 2486 2486 2486 FEB 56.1 52.4 54.5 75.0 71.2 73.2 19.2 18.7 2486 2486 2486 MAR 53.5 50.6 51.9 72.1 69.1 70.4 19.0 18.5 2486 2486 2486 APR 51.3 48.4 50.2 70.1 64.8 68.6 19.2 18.4 2486 1862 2419 MAY 51.9 48.7 50.0 70.2 62.1 67.3 18.9 17.3 2486 1279 1499 JUN 54.7 49.3 51.2 73.4 66.5 69.4 18.7 17.6 2486 2486 2486 JUL 54.8 49.8 52.5 73.1 68.0 70.7 18.5 18.3 2486 2486 2486 AUG 55.5 50.7 53.9 74.0 60.4 70.5 19.1 16.6 2486 1950 2465 SEP 57.1 51.6 54.7 76.1 70.2 73.4 19.1 18.7 2486 2486 2486 OCT 55.6 51.0 53.5 74.7 69.9 72.5 19.6 19.0 2486 2486 2486 NOV 56.6 53.1 54.6 76.1 72.1 73.8 19.7 19.2 2486 2486 2486 DEC 54.5 51.4 53.0 74.0 63.1 71.8 20.2 18.8 2486 1941 2457 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 avg high low avg JAN 53 14 33 619 430 496 FEB 49 16 32 547 432 468 MAR 71 14 32 547 230 450 APR 28 <10 20 461 202 370 MAY 62 <20 32 465 134 250 JUN 34 12 25 518 446 490 JUL 34 10 22 562 403 480 AUG 114 <10 16 706 410 596 SEP 37 <10 16 749 394 656 OCT 37 11 25 734 360 548 NOV 41 13 26 576 384 536 DEC 49 23 35 518 341 474 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.

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2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 METALS (monthly avg. ug/1)

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

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

OCT 0.5 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) 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 <0.04 <0.04 10 Cyanide ND(10) ND(10) 30 Lead 0.22 0.04 10 Mercury ND(0.001) ND(0.001) 0.2 Silver <10 <10 2.9 Titanium - ND(10) none

  • Phenolic Compounds ND(13.32) ND(15.12) 150 (non-chlorinated)
    • Phenolic Cmpds ND(3.35) ND(3.75) 10 (chlorinated)
      • PCB's ND(1.59) ND(1.60) none
  • Reporting limits shown are the sum of individual Reporting Limits for 8 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/l)

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

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 Page2 of 6

2007 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 7.9 7.8 8.0 8.0 FEB 7.9 7.9 8.0 7.9 8.0 7.8 MAR 7.9 7.9 8.0 7.9 8.0 7.8 APR 7.9 8.0 7.9 8.0 7.9 7.7 MAY 7.8 7.8 7.9 7.9 7.9 7.7 JUN 7.8 7.8 7.9 7.8 7.8 7.6 JUL 8.1 8.1 8.0 8.0 8.0 7.8 AUG 7.9 7.9 7.8 7.9 8.0 7.6 SEP 8.1 8.1 8.1 8.1 8.1 7.8 OCT 7.9 7.9 7.9 7.9 8.0 7.7 NOV 8.0 8.0 8.0 8.0 7.8 7.7 DEC 7.9 7.9 7.9 7.9 8.0 7.7 DISCHARGE 001F SUSPENDED GREASE & OIL (mg/l) SOLIDS (mg/I)

Month hiah ave high ave JAN ND(5) ND(5) 19 18 FEB 11 11 17 17 MAR ND(5) ND(5) 13 13 APR ND(5) ND(5) 17 16 MAY ND(5) ND(5) 15 15 JUN ND(5) ND(5) 13 13 JUL ND(5) ND(5) 13 12 AUG ND(5) ND(5) 10 10 SEP 5 5 20 20 OCT ND(5) ND(5) 13 13 NOV ND(5) ND(5) 15 14 DEC ND(5) ND(5) 10 9 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/l) SOLIDS (mg/I) SOLIDS (mi/l)

Month high low ave high low ave high low ave JAN ND(5) ND(5) ND(5) 17 10 13 ND(0.1) ND(0.1) ND(0.1)

FEB ND(5) ND(5) ND(5) 28 12 16 ND(0.1) ND(0.1) ND(0.1)

MAR 6 ND(5) <5 74 15 32 ND(0.1) ND(0.1) ND(0.1)

APR ND(5) ND(5) ND(5) 14 8 12 ND(0.1) ND(0.1) ND(0.1)

MAY 6 ND(5) <5 76 29 44 ND(0.1) ND(0.1) ND(0.1)

JUN ND(5) ND(5) ND(5) 58 7 33 3.9 ND(0.1) 1.0 JUL ND(5) ND(5) ND(5) 45 ND(5) 20 ND(0.1) ND(0.1) ND(0.1)

AUG 6 ND(5) <5 17 8 12 ND(0.1) ND(0.1) ND(0.1)

SEP ND(5) ND(5) ND(5) 14 10 12 ND(0.1) ND(0.1) ND(0.1)

OCT ND(5) ND(5) ND(5) 23 11 15 ND(0.1) ND(0.1) ND(0.1)

NOV ND(5) ND(5) ND(5) 23 9 14 ND(0.1) ND(0.1) ND(0.1)

DEC ND(S) ND(5) ND(5) 33 ND(5) 16 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.

Page 3 of 6

2007 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 Au Cd Cr Cu At Cd Cr Cu At Cd Cr Cu JAN ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 16 26 ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 10 FEB MAR APR ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 31 61 ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) ND(10)

MAY JUN JUL ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) <10 <10 ND(10) ND(10) ND(l0) ND(10) ND(10) ND(10) .ND(10) ND(10)

AUG SEP OCT ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 19 27 ND(10) ND(10) ND(10) ND(10) ND(10) ND(10) 140 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 001D, B[,L, F, METALS (avg. ug/l) 001D 001 H 001L 001F Month Hg Ni Pb Zn Hg Ni Pb Zn Hg Ni Pb Zn Ni Pb Zn JAN ND(0.20) ND(10) ND(10) ND(10) ND(0.20) 16 ND(10) 13 ND(0.20) ND(10) ND(10) ND(10) N13(0.20) ND(10) r ~J(10) 55 FEB MAR APR ND(0.2) ND(10) ND(10) 212 ND(0.2) 22 ND(10) 17 ND(0.2) ND(10) ND(10) ND(10) ND(0.2) 11 1NJD(10) 17 MAY JUN JUL ND(0.20) ND(10) ND(10) 43 <0.20 <10 ND(10) ND(10) ND(0.20) ND(10) ND(10) ND(10) ND(0.20) ND(10) 1NJD(10) ND(10)

AUG SEP OCT ND(0.20) ND(10) ND(10) 170 ND(0.20) 16 ND(10) <10 ND(0.20) ND(10) ND(10) ND(10) ND(0.20) 86 1ND(10) 57 NOV DEC limit: none Note: 001D, 001H and 001L analyses performed on quarterly composites.

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

Page4 of 6

2007 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(S) ND(s) ND(5) ND(S) 23 ND(S) ND(S)

FEB <5 ND(S) ND(S) ND(S) ND(5) ND(S) 9 ND(S)

MAR <5 ND(S) ND(S) ND(S) 19 <5 6 APR <5 ND(S) ND(S) ND(S) ND(S) ND(S) ND(S) 9 MAY <5 ND(S) ND(S) ND(S) ND(5) ND(S) 6 23 JUN <5 ND(S) ND(S) ND(S) ND(S) ND(S) <5 JUL <5 ND(S) ND(S) ND(S) 7 5 ND(S) 5 AUG <5 ND(s) ND(s) ND(S) ND(S) ND(S) ND(S) ND(S)

SEP <5 ND(S) ND(S) ND(S) ND(S) ND(S) ND(S) 5 OCT <5 ND(S) ND(S) ND(5) S <S S NOV <5 ND(S) ND(S) ND(S) 5 ND(S) 10 DEC

<5 ND(S) ND(5) ND(S) ND(S) ND(5) <5 14 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 2007.

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

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

Mnnthi Olflt* OfllG OO1lH 0011 0011J 001K 001TL 001M 001P 002 003 004 Month 001D* 001G 001H 001I 001i 001K 001L I001M 001P 002 003 004 JAN ND(S) ND(S) ND(S) ND(S) ND(S) ND(S) ND(S) ND(S)

FEB ND(S) ND(S) ND(S) ND(S)

MAR ND(S)

APR <5 ND(S) ND(S) ND(S) ND(S) ND(S) ND(S) ND(S) ND(S)

MAY <5 ND(S)

JUN ND(S) ND(S)

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

AUG <5 ND(S)

SEP 8 ND(S)

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

NOV <5 DEC ND(S) ND(S) ND(S)

Limit: 15 15 15 15 15 15 15 15 15 is 15 15

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

Note: No discharges occurred from 0011 and 001K during 2007.

Page 5 of 6

2007 Annual Sununary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY ACUTE AND CHRONIC TOXICITY TESTING (toxicity units, tua and tuj ACUTE *CHRONIC Test 6-Month Test Month Result Median Result JAN FEB 0.00 0.00 1.0 MAR APR 0.00 0.00 1.0 MAY JUN JUL 0.00 0.00 1.0 AUG SEP OCT 0.41 0.41 1.0 NOV DEC 0.82 0.41 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.

NOTE: Two acute toxicity tests in October and December had mortalities.

Test results were suspect, but are being reported. See Summary of Monitoring Program Section 4.e.

DISCHARGE 001N ANNUAL ANALYSES Sludge Parameter Result Limit Percent Moisture 99% None Total Kjeldahl Nitrogen 1200 mg/kg None Ammonia (N) 86 mg/kg None Nitrate (N) ND(1) mg/kg None Total Phosphorus 230 mg/kg None pH 7.0 None Oil and Grease ND(200) mg/kg None Boron ND(3) mg/kg None Cadmium ND(0.3) mg/kg 10 X STLC*

Copper 3.6 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 7.4 mg/kg 10 X STLC Volume 1.06 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

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 INFLUENT Temperature ("F) 90.0 -

80.0 -b 70.0 +

60.0-50.0 40.0 -

30.0 +

High 20.0 -I * -l-Average 10.0 - Low 0 .0 I i I I I i i i . I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 DISCHARGE 001 EFFLUENT Temperature ('F) 90.0 -

80.0 +

70.0 60.0-50.0 -

40.0 -

30.0 4 ffigh 20.0 + *Average

-- O-Lew 10.0 0.0 I I I 1 I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Page I of 15

2007 Annual Summary .Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 EFFLUENT Flow (MGD) 3000 2500 2000 1500

. 1000 500 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 DISCHARGE 001 EFFLUENT Monthly Delta T (F) 25 20 15 10-mgh F

5-

-*-Average 04-JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Page 2 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Aeraigh Total ChlorineResidual ugil

-""-Average 120

---Low I 100 80 S60 40 20 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001 Total Chlorine Used, pounds per day 800 -

700 600 500 400 300 200 +

100 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Page 3 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Copper (monthly average, ug/l) 12 10 8+

4 SInflut 2 0Effluent 0 A - a JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 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/l) 35 30 R Limit 20 Influent 5 Effluent 10 5

01-JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 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/l.

Page 4 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001 Zinc (monthly average,ug/l) 80 70 -u 60

-0Limit 50 +

Influent 40 ---- EffluentI 30 +

20 +

10 0 1k a a a JAN FEB MAR APR , MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

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

101 8-4 ~1nfluentI W~t 2

0 + - - - - ------- 0s JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 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.

Page5 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant pH 8.2 "

8.1 8.0 1 i 7.9 7.8 7.7 7.6 7.5 7.4 7.3 -

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Several data points on this chart overlap.

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

3000 - - - M 2500 2000

= 1500 - -

- u-n6-Month Median Limit 1000 -

S-4* Effluent 500 A

  • I A I I 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 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

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F Oil & Grease (Maximum, mg/l)

.25.01-711ii 1 0

5. 9 -- -

- Daily Maximum Limit 2

- Monthly Average Limit 10.0 +

- Sample Result (Maximum) 5.0 -

k A A A U.U i - 0 a a JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Values plotted at zero were below the reporting limit.

DISCHARGE 001F Suspended Solids (Maximum, mg/l) 120 r 1100 U 100 80 -

M Daily Maximum Limit

Monthly Average Limit 60- - Sample Result (Maximum) 40 -

0 -- 0 0 0 0- 0 201 0*

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT- NOV DEC 2007 Note: Maximum values are plotted.

Page 7 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001N Oil & Grease(mg/l) 251

  • N Wl In M N M M 0 1 . -_N ____

20~

10 --

  • Daily Maximum Limit 10 ---- Monthly Average Limit 5 Average 0 Q
  • JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Values plotted at zero were below the reporting limit.

High, low and average values overlap at eleven points on this plot DISCHARGE 001N i Monthly Average Limit Suspended Solids (mg/i)

Hfigh 80

-- 4--Average 70 --

60 1 50 S40 30 20 10 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 DISCHARGE 001N Settleable Solids (mil) 4.5 4

3.5 3

s2.5 22-1.5 0.50 J

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 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

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001D QuarterlyMetals (ugil) 10,-

9-8-

7-6- 0 Cadmium M Chromium 5- M Copper MI1 Silveri 4-3-

2-1 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001D QuarterlyMetals (ug/l) 250 -r 200 - I13Nickel E Lead 150 - 13 Zinc

] Mercury 100-50 -

- A N r I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 9of15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001F 160 -r QuarterlyMetals (ug&l)

'1440 -

1200-10403-Cadmium v

~8 04-0 0[]1 Chromium Silver I 0 Copper 64 0

44 El-24 M I I I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

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

120 -

100 -

80 - El Mercury 0 Nickel 60 -

03 Lead 40 - Is Zinc 20 -

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

j-Page 10 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001H QuarterlyMetals (ug/1) 70 60 50 40 30 El Silver U Cadmium 20 M Chromium M Copper 10 0

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

DISCHARGE 001H Quarterly Metals (ug/l) 25 20 15 0 Nickel 10 E3 Lead M]Zinci 11 Mercury 5

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page 11 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant DISCHARGE 001L QuarterlyMetals (ug/l) 30 -

25 +

20 -

15 El Silver 0 Cadmium 10 + [] Chromium M Copper 5-0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting linit for values plotted at zero.

DISCHARGE 001L QuarterlyMetals (ugll) 10 9

8 7

6-4 E Nickel El Lead 3 MZincI 2 ElMercury 1

0 I I I I I I I I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: The analyte was not detected at or above the reporting limit for values plotted at zero.

Page12 of 15

.2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant MONTHLY TOTAL SUSPENDED SOLIDS 35 (Average, mg/l) 30 E 25 0 Monthly Average Limit 20 --- 001])

--- 1 001G 15 a---- 00O1 10 5 6 A A A A A A A - A A 0 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS 35 (Average, mg/I) 25 ---- *--Monthly Average Limit 0011 20 15 15 ---- O01M 10 0

5 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

MONTHLY TOTAL SUSPENDED SOLIDS (Average, mg/l) 35 -

30 25 -- Monthly Average Limit 001P

%20 0&*'-o-002 E 15 ---- 003 10 5

0 ,

JAN FEB MAR APR MAY JUN JUL AUG' SEP OCT NOV DEC 2007 Note: Points on chart may overlap. Values plotted at zero were below the reporting limit.

Page 13 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant QUARTERLY OIL & GREASE (Average, mg/i) 16 14 4001D1 12 1 001G 10 IMoo 1HI 8 -a- Monthly Average Limit 6

4 2

0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Values plotted at zero were below the reporting limit. Less than values are plotted at the value.

QUARTERLY OIL & GREASE (Average, mg/1) 16 i--i -i N -m -n -mm * - m-14

ý001J1 12 1001L 10 17001M Limit Monthly Average 6

4 2

0 , -- - -

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Values plotted at zero were below the reporting limit.

QUARTERLY OIL & GREASE (A.verage, mg/l) 16 14 12 m o2P 10 -rn

-MI 1000 003i 6 -m--Monthly Average Limit 4

2 0 I - I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Note: Values plotted at zero were below the reporting limit.

Page 14 of 15

2007 Annual Summary Report on Discharge Monitoring at the Diablo Canyon Power Plant ACUTE AND CHRONIC TOXICITY 6.0 5.0 Chronic Results

    • 4.0 ---- 6-mo. Median Acute Limit A Acute Results 2ý 3.0 -- Chronic Limit

"*2.0 1.0 f 7A 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2007 Page 15 of 15

APPENDIX 4

SUMMARY

OF RWMP MONITORING FOR 2007 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 Feb 24 Jun 4 Aug.1 Dec 21 Vertical Band Transects 5/ 4x Feb 15 Jun 4 Jul 30 Dec 12 Benthic Stations. -8 / 4x Mar 7 Jun 20 Aug 31 Dec 12 Fish Observation Transects 12 I 4x May 8 Jul18 Sep 15 Jan 22 08 Bull Kelp Census */ lx Oct 24 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 6 out of 12 stations due to poor ocean conditions from December 2007 through January 2008.

2

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