r.

c 

### BEST TECHNOLOGYAVAILABLE 1999 TECHNICAL REPORT FOR THE PITTSBURG AND CONTRA COSTA POWER PLANTS

Submittedto: 

### SANFRANCISCOBAY REGIONALWATER QUALITY CONTROL BOARD In ComplianceWith 

### OrderNo. 95-225 PROVISION D17 

### NPDES PERMITNO. CAOOO4880 and 

### CENTRAL VALLEY REGIONALWATER QUALITY CONTROLBOARD In ComplianceWith 

### Order No. 95-234 PROVISIONE10 NPDES PERMIT NO. CA0004863

Submittedby: 

### SOUTHER 

### ENERGY CALIFORNIA January 31; 2000

I999BTA Report

### CONTENTS

EXECUTIVE 

### SUMMARY BEST TECHNOLOGYAVAILABLETECHNICAL REPORT Introduction Data Collected on PowerPlant Operations BTA Monitoring Provision 

### B. 1 

## - Pittsburg (E3. 

### 1 

### - Contra Costa) BTA Monitoring Provision B. 

### 2 

## - Pittsburg 

### (B. 2 

## - Contra Costa) BTA Monitoring Provision B. 

### 3 

### - Pittsburg (B. 

### 3 

### - Contra Costa) BTA Monitoring Provision 

### B. 4 

### - Pittsburg (E3.4

### - Contra Costa) BTA Monitoring Provision B. 

### 5. a 

## - Pittsburg (B. 

### 5.a 

## - Contra Costa) BTA Monitoring Provision 

### B. 5.

### b 

## - Pittsburg 

### (B. 5.b 

## - Contra Costa) BTA Monitoring Provision B. 5.c 

### - Pittsburg 

### Page 1 3 3 

### 3 4 5 

### 8 12 

### 14 14 15

1 1999BTA ReportAppendices:
AppendixA AppendixB
Appendix C
AppendixD AppendixE Hourly Gross Megawattsfor Contra CostaUnits 

### 6 & 

### 7 and Pittsburg Units 

### 1-7 Duringthe EntrainmentPeriod Hourly Gross Megawatts Above Minimum Load for ContraCosta Units 

### 6 8z 7 and Pittsburg Units 

### 1-6 when Pittsburg Unit 

### 7 was Below Maximum Available CapacityDuring the Entrainment Period Exceptions to Hourly Gross Megawatts Above Minimum 

### Load for Contra Costa Units 

### 6 & 

### 7 and Pittsburg Units 

### 1-6 when Pittsburg Unit 

### 7 

### was Below Maximum AvailableCapacity Duringthe Entrainment Period ResourcesManagement Program Summary 

### of Modificationsand Improvementsto Intake Systems

11 1999BTA Report

### TABLES Number Page 1 

### Summaryof Pittsburg Unit 7 Outages and Curtailments During the 1999 

### 4 Entrainment Period 

### 2 

### Summaryof 

### Hours for Contra Costa Units 

### 6 & 

### 7 and Pittsburg Units 1-6 7 Relative to Pittsburg Unit 

### 7 Operation for the 1999 Entrainment Period 3 Monthly Capacity Factors and Gross Monthly Generation 

### for the 1999 12 Entrainment Period 4 MonthlyCooling Water Flow by Unit Group for Pittsburg and Contra Costa Power Plants for the 1999 Entrainment Period 13

... 111 I999BTA Report

### EXECUTIW SUMMARY
Southern Energy California, in compliance with provisions of the NPDES permits and BTA Monitoring Program requirements for the Pittsburg and Contra Costa power plants, has developed this technical report for the 1999 striped bass 

# --

“entrainment period”, which ran from May 

### 1to July 15, inclusive. 

### In accordan>e with permit provisions, the period referred to 

### as the eniGnt period 

### is the time from May 

### 1 

# ...“or such later date that the Discharger demonstrates by a Threshold Monitoring Program or other program approved by Fish and Game that the density of striped bass either entrained 

### or located in the river or at the intake structure, normalized to 

### 150 mm equivalents, exceeds 0.0005 per cubic meter of cooling water (for entrainment sampling) for three consecutive sampling days at either power plant or 

### as defined by the agreement with CDFG” and continues until July 15 or until the 38-mm striped bass index is predicted to be set, whichever is earlier. 

### Thus the entrainment period does not necessarily comprise the entire time from May 1to the date on which the 38-mm index is set. This year, the entrainment period ended on July 15, although the California Department of Fish and Game didn’t predict that the 38-mm index would be set until August 

### 6. A summary of the significant findings and conclusions related to the provisions of the BTA Monitoring Programis presented below:

a Reductions in cooling water system operations and striped bass losses were achieved at the two power plants 

### as a result of measures implemented during the 1999 striped bass entrainment period. The entrainment period extended fromMay 

### 1through July 15,1999. The entrainment period was terminated July 15,

### as described 

### in the “AgreementBetween The Pacific 

### Gas and Electric Company and the California Department of Fish and Game for the Monitoring and Mitigation of Striped Bass in the Sacramento-San Joaquin Estuary”. This agreement was reassigned upon sale of the Pittsburg and Contra Costa power plants to Southern Energy California. CDFG predicted that the 38-mm striped bass index would be set on August 6,

a Measures implemented during the 1999 entrainment period at the Contra Costa and Pittsburg power plants to reduce striped bass losses included: operation of the variable speed circulating water pump controls; removal of circulating water pumps from service as soon 

### as practicable to reduce cooling water volumes on units which were not in operation; preferential operation of Pittsburg Unit 

### 7; dispatch of committed units to minimize the frequency of discharge temperatures exceeding 86“ F; and reduced unit loading 

### as part of the Resources Management Program.

a As provided for in the PG&E/reassigned Southern Energy California and CDFG Striped

~ 

### ) $2, c, @ <*-

F. f Bass Agreement (1995), the 1986 striped 

### bass distribution, the current year operations, and the average __,^l__.&-,.*-.--“-*%- of 1976 1978, .-.--n.C*m*r.+., and

.IC- 1979 nw-yy-a 

### opera$@ alive 

### yb,y,p’f, reduction of 89.0percent in striped bass losses fro --“--.*-.,,.- .pl 

### ,p”) 

## - \,p 

## .c..i” t:x, 

### t.

i 1 1999BTA Report0 Preferential operation of Pittsburg Unit 

### 7 in accordance with the Resources Management Programwas achieved during the 

### 1999 entrainment period. Pittsburg Unit 

### 7 was available 

### 1,824hours 

### (100 percent) during 

### the 

### 1999 entrainment period. For 

### 97.9percent of the time that either 

### (1) Pittsburg Unit 

### 7 

### was operating at maximum available capacity, or 

### (2) when Pittsburg Unit 

### 7 was operating at less than maximum available capacity (per the 

### RMP), Contra Costa Units 

### 1-7 and Pittsburg Units 

### 1-6 were operating at or below minimum capacity.

0 Pittsburg Units 

### 1-6 and Contra Costa Units 

### 4-7 are equipped with temperature-modified, variable speed circulating water pump controls. The variable speed pump controls contributed to areduction in cooling water volumes.

2 I999 BTA ReportI t



### BEST TECHNOLOGY AVAILABLE TECHNICALREPORT
Introduction Southern Energy California (SECAL)has prepared this technical report to complywith provisions of the NPDES permits and BTA (best technology available) Monitoring Program requirements for the Pittsburg and Contra Costa power plants. 

### In 1993, Delta smelt was listed 

### as a threatened species under both the federal and state Endangered Species Acts. As provided for 

### in the 1995 Striped Bass Agreement between PG&E (reassigned to SECAL upon sale of Pittsburg and Contra Costa power plants in April, 1999) and CDFG, striped bass monitoring was not conducted in 1999 because of the possibility of collecting a Delta smelt. SECALand the CDFG agreed 

### to use striped bass entrainment data from 1986, a year which closely approximated 1999 bay outflow conditions, and actual 1999 power plant cooling water systems data to estimate losses for 1999. Since no threshold monitoring was done, the striped bass entrainment period ran from May 1 through July 15, and terminated on July 15, 

### as stipulated in the CDFG striped bass agreement. CDFG predicted that the 

### 38-mm index would be set on August 6,1999. This report presents a restatement 

### of each provision from Section B of the BTA Monitoring and Reporting Program requirements for both NPDES permits, followed by a discussion of compliance with that provision. For purposes of this compliance report, the monitoring requirements will be listed as they appear in the Monitoring and Reporting Program for the Pittsburg PowerPlant with the corresponding requirement, if any, for the Contra Costa Power Plant in parentheses. 

### Data Collected on Power Plant Operations The following operations data were collected at both the Pittsburg and Contra Costa power plants in accordance with Section A of the BTA Monitoring and Reporting Program: Hourly records compiled on the operation of each circulating water pump at both plants from May 1 to July 15, 1999. Records for the constant speed circulating water pumps at Contra Costa Units 1-3 and Pittsburg Unit 7 show whether each pump was in or out of service. Records for variable speed circulating water pumps at Pittsburg Units 1-6 and Contra Costa Units 4-7 show the percent of flow for each pump. Hourly discharge temperatures compiled from Foxboro temperature recorders located 

### in the discharge conduits at Pittsburg Units 1-4, 5 and 6, and the Contra Costa Units 1-5, 6 and 

### 7 for the period 

### from May 1to July 15,1999. Hourly records of gross electrical generation for Contra Costa Units 6 & 

### 7 and Pittsburg Units 1-7 during the 1999 entrainment period.

3 I999BTA Report

### BTA Monitoring Provision 

### B. 1.

# - Pittsburg (Provision

### B. 1.

# - Contra Costa) A tabulation 

### of outages and curtailments 

### for Pittsburg Unit 

### 7 by occurrence with a brief description of the cause of eachoccurrence during theprevious entrainmentperiod. 

### Discussion Table 

### 1 presents information on the curtailments and outages during the 

### 1999 entrainment period. Unit 

### 7 did not have 

### any forced.or scheduled outages. 

### Two curtailments affected the unit’s generating capacity during the 

### 1999 entrainment period. Unit 

### 7 remained available for service during these forced curtailments. Table 

### 1 

### Summary of Pittsburg Unit 

### 7 Outages and Curtailments During the 

### 1999 Entrainment Period Total Curtailment(Mwe) Outage (Mwe) Start Date / Time End Date/ Time Hours Reason Forced Scheduled Forced Scheduled 05-24-99/ 1430 05-24-99/ 1805 4 Feedwater heater high level trip 62 06-26-99/ lo00 06-29-99/ 2210 82 Feedwater heaterhead leak 12 

### *


## * Note: the hours reported are for the entrainment period only.

4 I999BTA Report

### BTA Monitoring Provision 

### B. 2.

# - Pittsburg (Provision

### B. 2. 

# - Contra Costa) A comparison of hourly electrical generation by unit at Contra Costa Units 1-7and Pittsburg Units 

### 1-6 with the generation at Pittsburg Unit 

### 7 (expressed 

### as a percentage 

### of available capacity)during theprevious entrainmentperiod 

### as itpertains to compliance withprovisions 

### of the ResourcesManagementProgram. 

### Discussion Hourly gross megawatts for Contra Costa Units 6 & 

### 7 (Units 

### 1-5 were not operated in 1999,and consequently, 

### are not reported here) and Pittsburg Units 1-7 for each day of the entrainment period (May 1 through July 15) 

### are provided in Appendix A. 

### Also included in 

### this appendix is the hourly generation at Pittsburg Unit 

### 7 expressed 

### as a percentage of available capacity. Pittsburg Unit 

### 7 available capacity reflects the maximum generation possible from the unit each hour. The available capacity varies in response to changing operating conditions 

### as reported in the unit-specific curtailments and outages (shown in Table 1) for Unit 

### 7. Appendix

### B provides the hourly 

### gross megawatts above minimum load for Contra Costa Units 6 & 

### 7 and Pittsburg Units 1-6 when Pittsburg Unit 

### 7 was operating at 

### less than 

### 100percent of its available load during the entrainment period. To arrive at the values in Appendix 

### B, the minimum load established for each unit was subtracted from the hourly generation values reported for each unit in Appendix A. Minimum load is set each year by the Operations Department 

### of the power plants and is based on the current operating condition of the units. In 1999, the minimum load was 

### 35 megawatts for Pittsburg Power Plant Units 1-4 and 

### 50 megawatts for Pittsburg Power Plant Units 5 & 

### 6 and Contra Costa Power Plant Units 

### 6 & 

### 7. Unless a unit was operating aboveminimum load when PittsburgUnit 

### 7 was not operating at full available capacity, generation at the units is reported 

### as a zero in Appendix 

### B. Appendix 

### B thus serves to highlight all instances when one or more of the units at the two plants was operating above minimum load at the same time that Pittsburg Unit 7 was not operating at full available capacity. Constraints imposed by rapid changes in system demand or the necessity to maintain system reliability precluded the preferential operation of Pittsburg Unit 

### 7 on some occasions. The margins of Appendix 

### B have been numbered to indicate those instances when Pittsburg Unit 7 was operating at less than maximum available capacity when other unites) were operating above minimum load. These margin numbers correspond to the event numbers listed in Appendix 

### C which summarize the date, time, and affected units for each instance of non-preferential operation. Appendix 

### C also provides a description of the situation or problem that caused the occurrence. Instanceswhen Unit 

### 7 was not operatingat full available capacitywhen anotherunit was operating at less than 10

### MW aboveminimum load are not discussed. Evaluating compliance with provisions of the Resources Management Program (W) requires considerationof both the preferential operation

### ofPittsburg Unit 7 duringthe entrainmentperiod and operational constraints related to meeting electrical system demand and maintaining system reliability. Preferential operation of Pittsburg Unit 

### 7 can involve a change from the standardunit

5 1999 BTA Reportdispatch schedule of the Independent SystemOperator or 

### SECKto maximize power production from Pittsburg Unit 

### 7 before increasing power production above minimum load at any other unit at the Pittsburg and Contra Costa power plants 

### as required under Section D.14 and E.7 of each power plants "DES Permits, respectively (See Appendix D for a complete listing of all provisions of the RMP). 

### This preferential operation scheme is to be in effect throughout the striped bass entrainment period. Appendix 

### B represents the tabulation of 

### 14,592 hourly observations during the entrainment period (Pittsburg Units 

### 1-6 and Contra Costa Units 

### 6 & 

### 7 = 8 units x 

### 1,824 total hourly observations during the entrainment period 

### = 14,592). During the striped bass entrainment period, Pittsburg Unit 

### 7 was available 

### 100 percent of the time. Table 

### 2 provides a 

### summary of the information presented 

### in Appendix C relative to Pittsburg Unit 

### 7 operation during the entrainment period. For 

### 97.9percent of the time that either (1) Pittsburg Unit 

### 7 was operating at maximum available capacity, or 

### (2) when Pittsburg Unit 

### 7 was operating at less than maximum available capacity (per the RMP), Contra Costa Units 1-7 and Pittsburg Units 

### 1-6 were operating at orbelow minimum capacity. Table 

### 2 demonstrates adherence to preferential operation of Pittsburg Unit 

### 7 during the 

### 1999 entrainment period.

6 1999BTA ReportTable 

### 2 Summary of Hours for Contra CostaUnits 6 &7 and PittsburgUnits 1-6 Relative to PittsburgUnit 7 Operation for the 1999 Entrainment Period Number of Percentage

(Hours) Total Observations of PPPU7 at less than Maximum Available PPPU7 Operating a.4 Under RMP Provision 1,480 10.1 PPPU7 at Maximum Available 0 Mwe above Minimum Load for CCPPU6 & 7
Subtotal and PPPU1-6
Mwe above Minimum Load for CCPPU6 & 7 and PPPU1-6 1-9 10-25 26-50 51-75 76-100 101-150 151-200 20 1-250 >250 12,816 14,296

147

11 20 12 

### 5 28 10 11 52 87.8
97.9

1

## .o 0.1 0.1 0.1 4.1

0.1 0.1 0.1 0.4 Subtotal 296 2.1 Total 14,592 100.0 Note: Generation is reported 

### as a zero when a unit is operating at, or below, minimum load as well as when PittsburgUnit 7 is operating at full availablecapacity.

7 1999 BTAReport

### BTA Monitoring Provision 

### B. 3.

# - Pittsburg (Provision

### B. 3.

# - Contra Costa) A summary 

### ofinformation used to determine the start and end date 

### ofthe entrainment period. 

### Discussion The 1999 entrainment period ran from May 1 to July 15, inclusive. The NPDES permits state that “the entrainment period shall commence either May 

### 1 or such later date that the Discharger demonstrates by 

### a Threshold Monitoring Program or other program approved by Fish and Game that the density of striped bass either entrained or located 

### in the river or at the intake structure, normalized to 150 

### mm equivalents, exceeds 

### 0.0005 per cubic meter of cooling water (for entrainment sampling) for three consecutive sampling days at either power plant, 

### or 

### as defined by the agreement with the CDFG.” Threshold monitoring was not conducted; therefore, the entrainment period began May 1. Under the NPDES permits, the entrainment period can end when “the density of striped bass normalized to 150 

### mm is less than 0.0005 per cubic meter of cooling water (for entrainment sampling) in any three consecutivemonitoring samples at both Pittsburg and Contra Costa Power Plants, or the day when the striped 

### bass 

### 38 

### mm index 

### is set, 

### as predicted by CDFG whichever is earlier” or 

### as described 

### in the “Agreement Between The Pacific 

### Gas and Electric Company and the California Department of Fish and Game for the Monitoring and Mitigation of Striped 

### Bass in the Sacramento-San Joaquin Estuary”. This agreement was reassigned upon sale of the Pittsburg and Contra Costa power plants to SECAL. The 1999 entrainment period ended 

### as stipulated 

### in the agreement on July 15. CDFG predicted that the striped bass population would reach 

### 38-mm as of August 

### 6, 1999 (See letter to Southern Energy Delta from Perry Herrgesell (CDFG) dated September 21, 1999).

8 1999 BTAReportYL

d 

### blank page left for 

### CDFG letter

9 1999BTAReportblank page left 

### for CDFG letter

10 1999BTA Reportblank page left for 

### CDFG letter

11 1999BTAReport

### BTA 

### MonitoringProvision

### B. 4.

# - Pittsburg (Provision

### B. 4.

# - Contra 

### Costa) A summary 

### of monthly capacityfactors and generation by unit for the Pittsburg and Contra Costapowerplants and monthly cooling 

### water flow 

### by unit group 

### as in 

### A.2 for the preceding entrainmentperiod. 

### Discussion The 1999 entrainment period ran from May 

### 1 through July 15, 1999. Monthly generation, capacity factors, and cooling water volumes 

### are therefore reported for the months of May, June, and July 1-15. The monthly capacityfactors (percent)and generation by unit for Contra Costa and Pittsburg powerplants duringMay, June, and 

### July 1-15, 1999are presented in Table 

### 3. A capacity factor is determined by dividing the actual 

### gross unit generation 

### by the maximum potential generation during the period of interest. The capacity factor gives an indication of the amountof generation a unit is producing versus the maximum generation a unit can produce.

Power Plant Contra Costa Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Pittsburg Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Table 3 Monthly Capacity Factors and GrossMonthly Generation forthe 1999Entrainment Period CaDacity Factors’ GrossMonthly Generation (MWH) 2 May June Julf May June July’ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 

### 0 6.0 2.1 21.4 5.8 10.0 27.4 0 0 0 0 0 0 

### 0 0 0 0 0 0 

### 0 0 0 15,480 6,670 26,530 14,780 24,830 34,000
0.0 4.7 15.6 0 5,800 9,540 0.0 1.8 15.5 0 2,250 9,510 0.0 1.7 10.5 0 2,140 6,410 1



### .o 1.9 11.9 1,310 2,340 7,270 0.0 9.1 22.6 0 21,540 26,790 11.1 6.1 15.8 27,200 14,540 18,790 28.7 32.8 47.5 158,100 175,000 126,500 Thesenumbers represent the gross capacity factors for the unit’s generators. These numbers represent the MWHs generatedby both the main and the house-unit generators. 

# ’ July 1-15,only.

12 1999BTAReportThe monthly cooling water flow 

### (m3 

### x 10') by unit group for Contra Costa and Pittsburg power plants during May, June, and July 1-15, 1999 

### is presented in Table 

### 4. These data are presented by unit group because each group shares the samewater intake structure.



## * In millions Table 4 Monthly Cooling Water Flow*by Unit Groupfor Pittsburg and Contra CostaPower Plants for the 1999Entrainment Period Power Plant May June July (

### 1

### -15) 

### Pittsburg Units 1-4, & 7 3.90 10.12 17.60 

### Units 5 & 6 9.54 15.60 14.32 

### Contra Costa Units 1-5 

### 0.00 0.00 0.00 Units 6 & 

### 7 8.70 10.20 13.83 of cubicmeters.

13 1999BTA Report

### BTA Monitoring Provision 

### B. 5. a.

# - Pittsburg (Provision

### B. 

### 5. a.

# - Contra Costa) Compliance withResourceManagementProgram 

### Discussion Evaluating compliance with provisions of the 

### RMP requires consideration of both the preferential operation of Pittsburg Unit 

### 7 during the entrainment period and operational constraints related to meeting electrical system demand and maintaining system reliability. Preferential operation of Pittsburg Unit 

### 7 

### can involve a change from the standard unit dispatch schedule of the Independent System Operator or SECAL to maximize power production from Pittsburg Unit 

### 7 before increasing power production above minimum load at any other unit at the Pittsburg and Contra Costa power plants except 

### as stipulated under Section D. 

### 14 and 

### E.7 of each power plants NPDES Permits, respectively (See Appendix D for a complete listing of all provisions related to the 

### RMP). Preferential operation of Pittsburg Unit 7 is required throughout the striped bass entrainment period. 

### In 1999, the entrainment period ran from May 

### 1 through July 15. During the striped bass entrainment period, Pittsburg Unit 

### 7 was available 

### 100 percent 

### of the time (1,824 out of a possible 1,824hours). Table 2 demonstrates adherence to either preferential operation of Pittsburg Unit 

### 7 when it 

### was available for service or to the provisions 

### of the 

### RMP during the 1999 striped bass entrainment period. For 97.9 percent 

### of the time either (1) Pittsburg Unit 7 

### was operating at maximum available capacity, or (2) when Pittsburg Unit 

### 7 was operating at less than maximum available capacity (per Provisions D. 14 and 

### E.7of the RMP), Contra Costa Units 

### 1-7 and Pittsburg Units 1-6 were operating at or below minimum capacity.


### BTA Monitoring Provision B. 5. 

### b.

# - Pittsburg Provision B. 

### 5. b. 

# - Contra Costa) Status 

### of intake improvements andmodification, 

## if any. 

### Discussion No improvements or modifications to the intake systems were made in the previous 12-month period (since the last BTA report was submitted, January 31,1999). 

### A 

### summary of previous intake improvements and modifications, including installation of temperature modulated variable speed pumps at Pittsburg Units 1-4 and Contra Costa Units 4-5 and a circulating water crossover system on Contra Costa Units 1-3 (1987 and 1988) are listed in AppendixE.

14 1999BTA Report

### BTA Monitoring 

### B. 

### 5. c.- 

### Pittsburg A summary 

### of intake screen operation (rotation frequency)at Contra Costaand Pittsburg Power Plants, 

### and 

### fish pump operation at the Contra Costa 

### Units 1-5 intake during the previous calendaryear. 

### Discussion Debris retained, along with fish and invertebrates, by the cooling water intake screens at the Pittsburg and Contra Costa power plants is removed during screen rotation and washing. This is to maintain intake water velocities as close as practicable to design levels 

### as specified in provisions of the 

### NPDES permits. Screen rotation and washing are initiated either manually,by a timer, or when the hydraulic differential across the screen exceeds a predeterminedmaximum. Intake screens 

### are normally operated on a timer set 

### for two wash cycles per 8-hour shift at the Pittsburg Power Plant and three wash cycles per 8-hour shift at the Contra Costa Power Plant, with each wash cycle 

### 15 minutes in duration. 

### All intake screens in operation at both power plants were rotated and cleaned using dual high-pressure spray washes at a frequencyof not less than once every four hours with the exception of those intake screens removed from service by mechanicalfailure,periodic maintenance inspections,

### or overhaul. Because Contra Costa Units 

### 1-5 were not in service during the entrainment period, the fish pumps were not operated in 1999.

15 1999BTA Report

### BEST TECHNOLOGYAVAILABLE 1999 TECHNICAL REPORT FOR THE PITTSBURG AND CONTRA COSTA POWER PLANTS
APPENDICES

Submittedto: 

### SANFRANCISCO BAY REGIONALWATER QUALITY CONTROL BOARD In Compliance With


### Order No. 95-225 PROVISION D17 NPDES PERMIT NO. CA0004880 and
CENTRAL VALLEY REGIONALWATER QUALITY CONTROLBOARD In ComplianceWith


### ORDER NO. 95-234 PROVISIONE10 NPDES PERMITNO. CA0004863

Submittedby: 

### SOUTHERNENERGY 

### CALIFORNIA January 31,2000

1999BTAReport

### TABLE OF CONTENTS AppendixA Hourly Gross Megawatts for Contra Costa Units 

### 6 & 

### 7 and Pittsburg Units 

### 1-7 During the Entrainment Period AppendixB Hourly Gross MegawattsAbove Minimum Load for Contra CostaUnits 

### 6 & 

### 7 and Pittsburg Units 1-6 when Pittsburg Unit 

### 7 was Below Maximum Available Capacity During the EntrainmentPeriod Appendix C Exceptions to Hourly Gross Megawatts Above Minimum Load for Contra Costa Units 

### 6 & 

### 7 and Pittsburg Units 

### 1-6 when Pittsburg Unit 7 was Below Maximum Available Capacity Duringthe Entrainment Period AppendixD ResourcesManagement Program AppendixE 

### Summary of Modificationsand Improvementsto Intake Systems

1999BTAReport

### Appendix

### A Hourly Gross Megawattsfor Contra 

### Costa Units 6 & 

### 7 

### and Pittsburg Units 1-7

### During the EntrainmentPeriod

1999BTA Report

### Appendix

### B Hourly Gross Megawatts Above Minimum Load for Contra Costa Units 6 & 

### 7 and Pittsburg Units 1-6

### when PittsburgUnit 7 

### was Below MaximumAvailable Capacity During the EntrainmentPeriod

I999BTA Repori

### Appendix 

### C Exceptionsto Hourly Gross Megawatts Above Minimum Load for Contra Costa 

### Units 6 & 

### 7 

### and Pittsburg Units 1-6

### when PittsburgUnit 7 was Below Maximum Available Capacity During the Entrainment Period

1999BTA Report

### Exceptions to Hourly Gross Megawatts Above Minimum Load for Contra Costa

### Units 6 & 

### 7 and Pittsburg Units 

### 1-6when PittsburgUnit7 was below Maximum Available Capacity During the Entrainment Period: 1999
Event Affected Plant & Unit Number me Contracosta Pittsburg Time 1 05/06/99 6 6 0500-0600 6 0500 2 05/19/99 7 0900 3 05/20/99 7 0900 4 05/24/99 7 0900 5 05/25/99 7 0400-0500 6 05/27/99 6 2200 7 05/28/99 7 2000 8 06/09/99 5 1700-2200 9 06/22/99 5,6 1900 10 06/28/99 67 1,5,6 1900 11 06/29/99 6 5 2200 12 06/30/99 6,7 1,3,4,5,6 1500 13 06/30/99 67 1,3,4,5,6 1700-1800 14 06/30/99 67 5,6 2200 15 07/08/99 5 2300 16 07/19/99 67 1500 17 07/11/99 5 2200 18 07/12/99 677 1,2,4,5,6 1400-1900 19 07/13/99 67 0900 20 07/14/99 67 5,6 0800 21 07/14/99 67 5,6 1100 23 07/14/99 67 5,6 1900 24 07/15/99 67 5,6 0900 25 07/15/99 67 1400 22 07/14/99 67 5,6 1300-1600

26 07/15/99 697 16 1900 27 07/15/99 67 2000-2200 28 07/15/99 7 2300 Comments PPPU7 coming on line after fuel economy PPPU7 raising load simultaneously See event#2 See event #2 CCPPU7 ordered to low-range AGC PPPU6 ordered to low-range AGC CCPPU7 valve testing PPPU5 vibration testing after overhaul See event#2 PPPU7 thoughtto be at full available Lowering load simultaneously See event#15 See event#15 See event#16 See event#16 See event#15 PPPU5 ordered to high-range AGC See event#15 See event #2 See event #2 See event#15 See event#15 See event#15 See event#2 Load change on PPPU7 orderedby SCEM See event#16 CCPPU6,7 ordered to full availableby SCEM CCPPU7 lowering load



## c- 1 1999BTA Report

### Appendix 

### D Resources

### ManagementProgram

1999BTAReport

### Provisions 

### Related 

### toBTA* 14. (7. 

### - Contra Costa)

if During the entrainment period, the discharger shall implement the following Resources Management Program,which is designedto minimize adverse environmental impacts:

a. The Discharger shall maximize the commitment of, dispatchingof, and power productionfromPittsburgUnit 

### 7, as requiredto meet system demand, in place of and before the dispatchingand power production above minimum load at any otherunit at Pittsburg or Contra CostaPower Plants, except under the following conditions: 

### 1) Whenever PittsburgUnit 

### 7 is committed, Pittsburg Unit 5 or 

### 6 may operate at minimum load for the purpose ofproviding steamnecessary to start orrestart PittsburgUnit 

### 7. 

### 2) The Dischargermay remove PittsburgUnit 

### 7 from service for emergencyor unscheduled maintenance, for personnel or equipment safety, or for the reliabilityof the system. 

### 3) The Dischargermay have PittsburgUnit 

### 7 at less than full available load when other committed units are dispatched aboveminimum load necessary to meet system stability, equipmentor personnel safety, and torespondto system transient conditions. 4) When generation from PittsburgUnit 

### 7 is not needed, the Discharger may have oneunit in operationat Pittsburg and/or Contra Costa, without dispatching PittsburgUnit 

### 7, if necessaryto maintain system reliability accordingto prudent utility operating practice, including equipment and personnel safety,or to provide steam supply. 5) The Dischargermay operateunits without restraint at eitherpower plant if the Discharge demonstrateswith the threshold monitoring program that the densitiesof stripedbass do not exceedthe threshold at that power plant. b. The Discharger shall minimize the commitmentand dispatch of all units at Contra CostaPower Plant to minimize coolingwater flows unless commitmentand dispatching

### of these units is necessary to meet system demand,to meet power pool commitments,and/or to maintain system 

## * From sectionD. and E. Provisions of the NPDES permits for the Pittsburg and Contra

Costapower plants, respectively.

D- 1 1999BTA ReportJ reliability according to prudent utility operating practice, including equipment and personnel safety.

c. All committed units at Pittsburg and Contra Costa power plants must be dispatched to the level at which the unit discharge temperatures equal 

### 86 OF before the discharge temperature for any similar unit 

### is allowed to exceed 

### 86 OF unless the unit is located at a plant which has fish densities below the threshold level as demonstratedby the threshold monitoring program. d. The Discharger shall schedule Pittsburg Unit 

### 7 overhauls 

### so that work not occur between 

### 1May and 

### 30 July each year. shall

e. The Discharger shall minimize circulation water flows under all conditions, temperatures shall 

### use except during clorination,while maintaining discharge pursuant to Provision 14.c 

### (7. 

### c 

## - Contra Costa). The Discharger the variable speedpumps whenever the units operate at reduced loads 

### in accordance with design parameters. Reduced load is defined as less than 

### 95% of maximumload for the existing variable speed pumps. The Discharger shall shut off circulation water for uncommittedunits 

### as soon possible, except 

### as required according to prudent operating practices to ensurepersonnel and equipment safety. 

### as
f. The Discharger shall recirculate house unit cooling water to suction when the house units at Contra Costa are in service without the main units.

D-2 1999BTA Report

### Appendix 

### E Summary 

### ofModifications

### and Improvementsto 

### Intake Systems

1999 BTA Report

### Summary

### ofModifications and Improvementsto 

### Intake Systems Year Modification andorImprovement 1999 None 1998 None 1997 None 1996 None. 1995 None. 1994 Fiberglass baskets installed 

### on Contra Costa intake screennumber 

### 8 (12/94) and 9 (3/94). 1993 Fiberglass baskets installed on Contra Costa intake screen number 

### 6 (6/93) and 

### 7 (3/93). 1992 None. 1991 Fiberglass baskets installed on Contra Costa intake screen number 

### 10 

### (11/91). 1990 None. 1989 None. 1988 Temperature modulated variable speed pumps installed on Pittsburg Units 1-4and Contra CostaUnits

### 4 & 

### 5. 1987 Water crossover system installed on Contra Costa Units 1-3.



### E- 1 1999 BTA Report