Lethabo Power Station Units No. 1 to 6 Particulate Emission Monitor Correlations, Unit No. 4 Start-up & Unit No. 6 Shutdown Report

Transcription

1 Lethabo Power Station Units No. 1 to 6 Particulate Emission Monitor Correlations, Unit No. 4 Start-up & Unit No. 6 Shutdown Report 1st July 2016 Report No. RSL222

2 P.O. Box 2459 Noordheuwel ext 4 Krugersdorp 1756 Vat No Chisel Street Boltonia Krugersdorp 1739 Tel: +27 (011) Tel: +27 (011) Fax:+27 (086) Eskom Holdings SOC Limited Lethabo Power Station Private Bag X415 Vereeniging 1930 Attention: Yaseen Waja Tel: Cell: Date Order No. Report No. Enquiries 1st July 2016 PO: RSL222 Tel: Cell: pieter@stacklabs.co.za REPORT No.: RSL222 LETHABO POWER STATION UNITS NO. 1 TO 6 PARTICULATE EMISSION MONITOR CORRELATIONS, UNIT NO. 4 START-UP & UNIT NO. 6 SHUTDOWN REPORT Sir Herewith the finalised report for the particulate emission monitor correlations conducted on Units No. 1 to 6 at Lethabo Power Station during the period from December 2015 to July 2016, Unit No. 4 Start-up Measurements and Unit No. 6 Shutdown Measurements. We thank you for the opportunity to be of service. We trust that your requirements were interpreted correctly. Should you however have any queries, please contact us at the above numbers, we will gladly assist. PH Pretorius Stacklabs ISO 9096, & STACKLABS ISO #:825268/: ISO 2003

3 Source Information Source Location: Lethabo Power Station Private Bag X415 Vereeniging 1930 South Africa Permit No. TBA Contact: Yaseen Waja Title: System Engineer Telephone: (016) Listed Activity Category: 1.1 Solid Combustion Installation Survey Date: December 2015 to July 2016 Pollutants: Total Particulate Matter (TPM) Negotiated Limit: 100 mg/nm 3 dry 10% O 2 Method: ISO 9096, & Plant: Unit No. 1 Survey Date: 9 th to 18 th March 2016 Measured Concentration: 12.6 to 58.1 mg/nm 3 dry 10 % O 2 Compliance: Yes All Measurements No. 1 to 11 Plant: Unit No. 2 Survey Date: 19 th to 23 rd December 2015 Measured Concentration: 11.6 to 91.2 mg/nm 3 dry 10 % O 2 Compliance: Yes Measurements No. 1 to 12 Measurement No. 9- plant malfunction Plant: Unit No. 4 Survey Date: 13 th to 17 th June 2016 Measured Concentration: 37.9 to mg/nm 3 dry 10 % O 2 Compliance: Yes Measurements No. 3 to 12 No Measurements No. 1 & 2 ( MW SB) Plant: Unit No. 5 Survey Date: 12 th to 17 th December 2015 Measured Concentration: 65.8 to 144 mg/nm 3 dry 10 % O 2 Compliance: Yes Measurements No. 7, 8, 9, 10, 12, 14 & 15 No Measurements No. 1 to 6, 11 & 13 Plant: Unit No. 6 Survey Date: 12 th to 7 th December 2015 Measured Concentration: 18.7 to mg/nm 3 dry 10 % O 2 Compliance: Yes Measurements No. 7 to 12, 14 & 15 No Measurements No. 1 to 6 & 13 Testing Laboratory Laboratory: Stacklabs 10 Chisel Street Boltonia Krugersdorp 1739 Contact: Mr PH Pretorius Title: Managing Member Telephone: (011) E Mail: pieter@stacklabs.co.za II

4 Report No. RSL222 Title: Units No. 1 to 6 Particulate Emission Monitor Correlations, Unit No. 4 Start-up & Unit No. 6 Shutdown Reference Revision SLOP019 0 Date 2012/05/25 Revision Date No Revision Compiled by Functional representative Authorised by..... WJ Bronkhorst P Buell PH Pretorius Team Leader Quality Representative Managing Member Review and Certification All work, activities and tasks performed for this report were carried out under my direction and supervision. All work was conducted in compliance with listed standards I have reviewed the details, calculations, results, conclusions and all written material contained within this report, and hereby certify that the presented material is authentic and accurate. Name: PH Pretorius Title: Managing Member 2016/07/01 Sign: Date: III

5 Table of Contents Section Source Information... Review and Certification... Report Summary... Page II III V 1. Monitoring Objective Plant Description and General Operating Procedures Methods and procedures Results Discussion Monitor Deviations Recommendations Acknowledgements References Distribution Appendix No. 1...Detailed Measurement Results 48 Appendix No. 2...Plant parameters 67 Appendix No. 3...Correlations Graphs 95 Appendix No. 4...Water Vapour Concentration Calculation 112 Appendix No Outlines of Procedures 114 Appendix No Particulate Emission Monitor Calibration Certificate 117 Appendix No. 7...Particle Size Analysis 120 Appendix No Filter Mass Sheets 124 Appendix No Calibration Certificate 130 IV

6 REPORT SUMMARY In order to meet the requirements of the South African Air Quality Act No. 39 of 2004 (Reference 9.1), all Solid Fuel Combustion Installations (Category 1.1) such as Lethabo Power Station, are obligated to monitor several listed pollutants during operation. These pollutants include particulate matter, Sulphur Dioxide and Oxides of Nitrogen. The Act further specifies that all particulate monitoring programs are required to meet international standards such as ISO 9096 & (Reference 9.2 & 9.3) and therewith ISO (Reference 9.4). To this end and in keeping with the ESKOM Standard for Emission Monitoring and Reporting ( ) (Reference 9.5) Eskom s scheduled particulate emission monitor correlations on five Units at its Lethabo Power Station situated near Vereeniging in the Northern Free State. The risks areas included Units No. 1, 2, 4, 5 & 6 s electrostatic precipitators and the only pollutant considered was particulate matter (particulate emission monitors correlations). Continuous particulate emission monitors generally operate on a principle of passing a light beam through a dust-laden gas stream. The dust concentration is then determined by measuring the degree of light attenuation resulting from the dust within the gas stream. However the degree of light attenuation is dependent on more than just the quantity of dust. Dust characteristics such as colour, size, shape and distribution of the dust within a duct, will all impact on the amount of light that is attenuated. In addition, these characteristics will change over time as the plant s electrostatic precipitator or bag filters performances change. In order to compensate for these characteristic changes and to facilitate the determination of mass emissions from the light attenuation, a correlation of light attenuation and measured mass emissions must be conducted at regular intervals. The correlation of the light attenuation and mass emission requires the determination of the actual mass emission emitted from a particular plant by means of isokinetic or Gravimetric dust sampling. This procedure must be conducted over a range of plant operating conditions representative of the plant s general operating conditions and is referred to as a particulate emission monitor correlation or a dynamic calibration. Stacklabs, an environmental testing laboratory, was contracted by Eskom to complete the required particulate emission monitor correlations on Units No. 1, 2, 4, 5 & 6. In addition to the five particulate emissions monitor correlations, Stacklabs was also contracted to conduct particulate emission measurements during a light up period on Unit No. 4 and a shutdown period on Unit No. 6. All required site measurements for the five correlations, the light up and shutdown measurements were carried out during the period from December 2015 to July The relevant results and correlation graphs have been presented in this report and may be summarised as follows: V

7 Report Summary Units No. 1, 2, 4, 5 & 6 Particulate Emission Monitor Correlations Unit No. 1 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 1. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 March 2016 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO Unit No. 1 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 1 March 2016 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /04/ * ma to /04/ * ma to 2.0 VI

8 Unit No. 1 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Unit No. 1 Particulate Emission Monitor Correlation Equations Output No. Lethabo Power Station Unit No. 1 March 2016 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2014/04/26 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a VII

9 Unit No. 2 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 2 except where indicated. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 Dec 2015 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O >20.0* >20.0* >20.0* All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *Measurements No. 5 & 8 were excluded from the Correlation on Output No. 1 due to signal saturation. Measurement No. 9 was excluded from Output No. 1 & 2 Correlations due to burst filter. Unit No. 2 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 2 December 2015 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /02/ * ma to /02/ * ma to 2.0 VIII

10 Unit No. 2 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 2 December 2015 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/02/23 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a IX

11 Unit No. 4 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 4. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 June 2016 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O * * * * * * All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *ma on Output 1 for Measurements No. 1, 2, 4, 5, 7 & 12 were extrapolated from Output 2 s results on request of customer. Unit No. 4 Particulate Emission Monitor Correlation Equations Output No. Lethabo Power Station Unit No. 4 June 2016 Correlations Issued Date Function Correlation *MME Monitor yyyy/mm/dd mg/nm 3 10% O 2 = m * ma + c Coefficient mg/nm 3 10% O 2 Range Extinction /07/ * ma to /07/ * ma to 2.0 X

12 Unit No. 4 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 4 June 2016 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/07/01 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a XI

13 Unit No. 5 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 5 except where indicated. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 Dec 2015 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O 2 1 >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *Measurements No. 1 to 6, 8 to 11, 13 & 14 were excluded from the Correlation on Output No. 1 due to signal saturation. Unit No. 5 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 5 Dec 2015 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /02/ * ma to /02/ * ma to 2.0 XII

14 Unit No. 5 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 5 December 2015 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/02/23 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a XIII

15 Unit No. 6 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 6 except as indicated. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 Dec 2015 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O 2 1 >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *Measurements No. 1 to 6 & 13 were excluded from the Correlation on Output No. 1 due to signal saturation. Unit No. 6 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 6 December 2015 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /02/ * ma to /02/ * ma to 2.0 XIV

16 Unit No. 6 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 6 December 2015 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/02/23 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a XV

17 Unit No. 4 Start-up Measurements The following table presents the conditions as captured during the boiler Light up on Unit No. 4 on the 16 th of March The table presents the boiler load in MW, particulate emission monitor s indications from Output No. 2 and the measured particulate emissions in mg/nm 3 10% O 2. Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass 2015 Correlation Measured Dust Mass mg/nm 3 (dry) mg/nm 3 (dry) Test No. MW % 10% O Stack O >20.0* >20.0* >20.0* Unit No. 6 Shutdown Measurement Results The following table presents the conditions as captured during the boiler shutdown on Unit No. 6 on the 27 th & 28 th of June The table presents the boiler load in MW, stack gas oxygen concentration in % v/v, particulate emission monitor s indications from Output No. 2 and the measured particulate emissions in mg/nm 3 10% O 2 & mg/nm 3 the actual stack gas oxygen concentrations. Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass 2015 Correlation Measured Dust Mass mg/nm 3 (dry) mg/nm 3 (dry) Test No. MW % 10% O Stack O >20.0* * >20.0* * The particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2 are not a true representation of the concentrations due to the high stack gas oxygen concentrations. Report Recommendations It is recommended that: The particulate emissions from Units No. 1 to 6 reported to the authorities, are according to the correlation function presented in Figures No. 1 & 2 of this report. The next compliant correlation is conducted on Unit No 3 during the first quarter of XVI

18 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 1 of Monitoring Objective The primary objective of the particulate emission monitor correlations presented in this report is to quantify the concentrations of all particulate matter released into the atmosphere during the operations of Units No. 1, 2, 4, 5 & 6 at Lethabo Power Station. The requirement for conducting the particulate emission monitor correlations is to demonstrate compliance with the requirements of the National Environmental Management: Air Quality Act (39/2004), Listed Activities and Associated Minimum Emission Standards in terms of Section 21, Category 1.1. The substance applicable under Category 1.1 is Particulate Matter which is capped at 100 mg/nm 3 10% O 2. This cap limit however, in the case of Lethabo Power Station, was negotiated to 100 mg/nm 3 10% O 2. The objective of the particulate emission measurements surveys that were conducted during the unit light up and shutdown periods on Units No. 4 & 6 respectively, was to quantify the concentrations of all particulate matter released into the atmosphere during the unit light up and shutdown periods. The requirement for conducting the particulate emission survey during the light up and shutdown periods has been set in the Stations Atmospheric Licence. 2. Plant Description & General Operating Procedure 2.1. The pulverised fuel steam generating boilers on which the particulate emission monitor correlations, light up and shutdown measurements were conducted, were originally designed for a maximum steam flow of 600 MW. These units were originally equipped with four parallel Brandt / Babcock electrostatic precipitators with a design capacity of 997 Am 3 /s gas flow and a performance collecting efficiency of 99.88%. The electrostatic precipitators were later retro-fitted with sulphur trioxide flue gas conditioning and recently upgraded with high frequency transformers on the first five fields. Electrostatic Precipitator Design Data for Unit under Test (original Design) 97 % MCR Number of ESPs in use 4 Gas Volume Flow Rate Worst Coal 997 m 3 /s Gas Temperature 132 C Inlet Dust Burden 34.9 g/nm 3 Outlet Dust Burden n/a mg/nm3 Carbon in Dust 2% Sulphur in Coal n/a% Pressure Drop 0.25Kpa Temperature Drop 11 C

19 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 2 of During the emission surveys, the particulate emission measurements were conducted through purpose built ports situated on the unit s stacks at a level approximately 150m above ground level. For a diagrammatic representation of the test positions, see the following sketch. Measurements were conducted along sections Q Q The operating regime followed during the survey periods included all significant activities that arise during normal production as well as some fault conditions. The correlation included measurements at the following Boiler Loads: Measurement No. Unit No. 1 Unit No. 2 Unit No. 4 Unit No. 5 Unit No. 6 Load (MW) Load (MW) Load (MW) Load (MW) Load (MW) S/S to 0.0 S/S S/S to S/S Start-up & Shutdown Measurements For additional information of the plant parameters please see Appendix No. 2.

20 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 3 of Methods & Procedures The method selected for the determination of the particulate emission concentration on Units No. 1, 2, 4, 5 & 6 was in compliance with ISO Stationary source emissions - Determination of concentration of particulate matter (dust) at low concentrations Manual gravimetric method. This general method can be briefly described as follows: A sharp-edged nozzle is positioned in the duct facing into the moving gas stream and a sample flow of the gas is extracted isokinetically for a measured period of time. To allow for nonuniformity of the distribution of particulate concentration in the duct, samples are taken at a pre-selected number of stated positions in the duct cross-section. The particulate matter entrapped in the gas sample is separated by a filter medium, then dried and weighed. The particulate concentration is calculated from the weighed particulate mass and the gas sample volume. The particulate mass flow rate is calculated from the particulate concentration and the duct gas volumetric flow rate. The particulate mass flow rate can also be calculated from the weighed particulate matter, the sample time, the area of the sample plane and the nozzle opening. The degree to which this sample represents the total gas flow depends on Homogeneity of the gas velocity within the sampling plane; A sufficient number of sampling points in the sampling plane; Isokinetic withdrawal of the plane As stated above, the gas has to be sampled at more than one sampling point in the sampling plane, dependant on the sampling plane area. This plane is normally divided into equal areas, at the centres of which gas is withdrawn. To determine the particle concentration in the plane, the nozzle is moved from one sampling point to the other, extracting gas isokinetically at each point. Sampling periods should be equal for each sampling point, resulting in a composite sample. If equal sampling areas cannot be chosen, the sampling period shall be proportional to the sampling area. The sample is extracted through a sampling train, which principally consists of: A sampling probe tube with entry nozzle; A particle separator; A gas metering system, in-stack or external; A suction system The particle separator and / or the gas metering system may be located either in the duct, or placed outside the duct. It is necessary to avoid condensation of vapour in the sampling train during gas sampling, because it will interfere with particle separation, particulate condition and flow measurements. To this end, the probe tube, the particle separator and the gas flow-measuring device may be heated above the relevant dew point where necessary. The water vapour may intentionally be removed downstream of the particle separator, to make use of a dry gas meter for the measurement of sampled gas volume. For isokinetic sampling, the gas velocity at the sampling point in the duct has to be measured, and the corresponding sample gas flow has to be calculated and adjusted. Normally a Pitot static tube is used for the measurement of duct gas velocity. If the sample gas flow-measuring device is used within the duct, the relationship between the measured pressure drop and the pitot static tube differential pressure is simple, facilitating the adjustment to

21 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 4 of 131 isokinetic conditions. If the gas meter device is situated outside the duct, the calculation of the isokinetic sample gas flow rate is more complicated. The calculation may also include the duct gas density under standard conditions (which may be derived from the dry gas composition and the moisture content), the temperature, static pressure of the gas in the duct, the gas meter device, and the water vapour content of the duct gas, if the sample gas flow is measured after water removal. After sampling, the collected particulate matter is completely recovered, dried and weighed and the concentrations are determined. All Stacklabs isokinetic sampling is carried out employing procedures and equipment that comply with the requirements of ISO (Reference 1). All Stacklabs sampling equipment is calibrated by SANAS accredited laboratories. Lethabo personnel were responsible for the setting of the plant prior to the test period. Stacklabs was contracted to provide the service of particulate emission monitors correlation through isokinetic dust sampling only. The broad outlines of filter weighing, pre-test preparations, sampling system integrity checks and sampling procedures are discussed in Appendix No 3.

22 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 5 of Results 4.1. Unit No. 1 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final particulate emission monitor correlations for Unit No. 1. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 March 2016 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO Unit No. 1 Particulate Emission Monitor Correlation Equations Output No. Lethabo Power Station Unit No. 1 March 2016 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2014/04/26 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a

23 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 6 of 131 Unit No. 1 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 1 March 2016 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2014/04/26 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a

24 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 7 of Unit No. 2 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 2 except where indicated. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 Dec 2015 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O >20.0* >20.0* >20.0* All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *Measurements No. 5 & 8 were excluded from the Correlation on Output No. 1 due to signal saturation. Measurement No. 9 was excluded from Output No. 1 & 2 Correlations due to burst filter. Unit No. 2 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 2 December 2015 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /02/ * ma to /02/ * ma to 2.0

25 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 8 of 131 Unit No. 2 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 2 December 2015 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/02/23 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a

26 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 9 of Unit No. 4 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 4. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 June 2016 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O * * * * * * All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *ma on Output 1 for Measurements No. 1, 2, 4, 5, 7 & 12 were extrapolated from Output 2 s results on request of customer. Unit No. 4 Particulate Emission Monitor Correlation Equations Output No. Lethabo Power Station Unit No. 4 June 2016 Correlations Issued Date Function Correlation *MME Monitor yyyy/mm/dd mg/nm 3 10% O 2 = m * ma + c Coefficient mg/nm 3 10% O 2 Range Extinction /07/ * ma to /07/ * ma to 2.0

27 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 10 of 131 Unit No. 4 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (kg/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 4 June 2016 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/07/01 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a

28 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 11 of Unit No. 5 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 5 except where indicated. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 Dec 2015 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O 2 1 >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *Measurements No. 1 to 6, 8 to 11, 13 & 14 were excluded from the Correlation on Output No. 1 due to signal saturation. Unit No. 5 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 5 Dec 2015 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /02/ * ma to /02/ * ma to 2.0

29 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 12 of 131 Unit No. 5 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (k/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 5 December 2015 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/02/23 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a

30 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 13 of Unit No. 6 The following table presents the results of the particulate emission monitor s indications from Outputs No. 1 & 2 as well as the measured particulate emissions in mg/nm 3 10% O 2. The measurements listed below were all included in the final correlations for Unit No. 6 except as indicated. Monitor Output (0 to 0.3 Ext) Output No. 1 Monitor Output (0 to 2 Ext) Output No.2 Dec 2015 Correlation Measured Dust Mass Test No. ma ma mg/nm 3 10% O 2 1 >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* >20.0* All particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2. The final correlation includes three zero points as described in ISO *Measurements No. 1 to 6 & 13 were excluded from the Correlation on Output No. 1 due to signal saturation. Unit No. 6 Particulate Emission Monitor Correlation Equations Lethabo Power Station Unit No. 6 December 2015 Correlations Issued Date Function Correlation *MME Monitor Output mg/nm 3 10% O yyyy/mm/dd 2 mg/nm 3 (d) Range Coefficient No. = m * ma + 10% O 2 Extinction /02/ * ma to /02/ * ma to 2.0

31 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 14 of 131 Unit No. 6 Air flow to gas flow correlation The following table presents the results of the plant recorded total Air Flow indication (k/s) as well as the measured Gas Flow results (Nm 3 10% O 2 ). Recorded Total Air Flow Measured Gas Flow Test No. kg/s Nm 3 10% O Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 Output No. Lethabo Power Station Unit No. 6 December 2015 Correlation Issued Date Function Correlation *MMGF Monitor yyyy/mm/dd n/a 2016/02/23 Nm 3 /s 10% O 2 = m * kg/s Air Flow + c * Air Flow (kg/s) Gas Flow reported as Nm 3 / s Dry corrected to 10% O 2 *MMGF: Maximum Measured Gas Flow during correlation period Coefficient Nm 3 /s 10% O 2 Range n/a

32 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 15 of Unit No. 4 Light up Measurement Results The following table presents the conditions as captured during the boiler Light up on Unit No. 4 on the 16 th of March The table presents the boiler load in MW, particulate emission monitor s indications from Output No. 2 and the measured particulate emissions in mg/nm 3 10% O 2. Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass 2015 Correlation Measured Dust Mass mg/nm 3 (dry) mg/nm 3 (dry) Test No. MW % 10% O Stack O >20.0* >20.0* >20.0* Unit No. 6 Shutdown Measurement Results The following table presents the conditions as captured during the boiler shutdown on Unit No. 6 on the 27 th & 28 th of June The table presents the boiler load in MW, stack gas oxygen concentration in % v/v, particulate emission monitor s indications from Output No. 2 and the measured particulate emissions in mg/nm 3 10% O 2 & mg/nm 3 the actual stack gas oxygen concentrations. Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass 2015 Correlation Measured Dust Mass mg/nm 3 (dry) mg/nm 3 (dry) Test No. MW % 10% O Stack O >20.0* * >20.0* * The particulate emissions reported as mg/nm 3 Dry corrected to 10% O 2 are not a true representation of the concentrations due to the high stack gas oxygen concentrations. The detailed results of the correlation measurements for Units No 1, 2, 4, 5 & 6 have been presented in the following Tables: Appendix No. 1 Detailed Measurement Results Appendix No. 2 Plant parameters Appendix No. 3 Correlations Graphs Appendix No. 7 Particle Size Analysis Appendix No. 8 Filter Mass Sheets

33 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 16 of 131 The following abbreviations were used in the text, tables and figures: MCR Maximum Continuous Rating C Degrees Celsius % v/v Percentage on a Volume-by-Volume basis Am 3 Actual Cubic Metres Nm 3 Normal Cubic Metres g/s Grams per second mg/s Milligrams per second Fo Fields out ESP Electrostatic Precipitator FFP Fabric Filter Plant ext. Extinction mg/nm 3 10% O 2 Milligrams per Normal cubic meters dry corrected to 10% Oxygen Actual refers to the measured temperature and pressure conditions of the gases in the duct Normal refers to the actual conditions being normalised to 0 C and 101,325 kpa.

34 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 17 of Discussion 5.1. Unit No. 1 Particulate Emission Correlation The correlation on Unit No 1 was completed form the 9 th to the 19 th of March A total of eleven measurements were conducted of which all eleven measurements were included in the final particulate emission monitor correlations. The following trends indicate the particulate emission monitor signals captured during Measurement No. 1 on the 9 th of March with 609 MW boiler loading and the Measurement No. 10 on the 19 th of March with 400 MW boiler loading.

35 Monitor Output (ma) Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 18 of Lethabo Unit No. 1 TPM Monitor Output Data (ma) Measurement No. 10 Output No The outputs settings of all the particulate emission monitors included in this report have been set for 0 to 0.03 extinction on Output No. 1 and 0 to 2.0 extinction on Output No. 2. The measured particulate emission concentrations on Unit No. 1 ranged from 12.6 to 58.1 mg/nm 3 10% O 2, well below the negotiated cap value of 100 mg/nm 3 10% O 2. The corresponding particulate emission monitor signals, recorded from Output No. 1, ranged from 6.5 to 14.5 ma. The resulting co-ordinates produced the following correlation with a correlation coefficient of 0.974, which falls within the standards tolerance of 0.95 to 1.05.

36 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 19 of 131 A correlation derived for Output No. 2 based on the monitor settings of 0 to 2.0 extinction is presented in the following Figure. This correlation also complies with the requirements of the ISO 10155, and includes the cap limit of 100 mg/nm 3 10% O 2.

37 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 20 of Unit No. 1 Airflow to Gas Flow Correlation In addition to the measurement of the particulate emissions, gas volume flow rates were also determined during this correlation period. The measured gas volume flow rates, which ranged from to Nm 3 /s 10% O 2, were correlated against the plants corresponding Total Air flow Rates to produce the following correlation with a coefficient of The following trends indicate Boiler load and Total Air Flow captured during Measurement No. 1 and demonstrates the typical load and air flow stability experienced during the correlation period.

38 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 21 of 131 Plant parameters and trends for each measurement have been presented in Appendix No. 3. The corresponding stack gas velocity data captured during Measurement No. 1 produced the following profile. The minimum, maximum and average gas velocity for this measurement was recorded as 27.8, 34.6 and 31.8 m/s respectively. The minimum and maximum deviation from the Average velocity is therefore 12.7 & 8.8 % respectively.

39 Particulate Emission (ma) Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 22 of Unit No. 2 Particulate Emission Correlation The correlation on Unit No 2 was completed from the 19 th to the 23 rd of December A total of thirteen measurements were conducted of which only eight measurements were included in the final particulate emission monitor correlation for Output No. 1 and twelve for the correlation for Output No. 2. Measurements No. 2, 5, 8 & 9 were excluded from the correlation for Output No. 1 as a result of monitor signal saturation on the first output. Measurement No. 9 was excluded from the correlations for Outputs No. 1 & 2 as a result of a burst filter. The following trends indicate the particulate emission monitor signals captured during Measurement No. 5 on the 20 th of December with 562 MW boiler loading. The trends show the saturated signal on Output No. 1 and the normal trend from Output No Lethabo Power Station Units No. 2 Measurement No. 5 Stack Emission Dust Emission ma Output The outputs settings have been set to 0 to 0.03 extinction on Output No. 1 and 0 to 2.0 extinction on Output No. 2.

40 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 23 of 131 The measured particulate emission concentrations on Unit No. 2, included in the correlation for Output No. 1, ranged from 11.6 to 83.3 mg/nm 3 10% O 2 and for output No. 2 ranged from 11.6 to 91.2 mg/nm 3 10% O 2. The maximum measured emission of 91.2 mg/nm 3 10% O2 was below the negotiated cap value of 100 mg/nm 3 10% O 2. The corresponding particulate emission monitor signals, recorded from Output No. 1, ranged from 6.0 to 19.3 ma. The resulting co-ordinates produced the following correlation with a correlation coefficient of 0.997, which falls within the standards tolerance of 0.95 to A correlation derived for Output No. 2 based on the monitor settings of 0 to 2.0 extinction is presented in the following Figure. This correlation also complies with the requirements of the ISO 10155, and includes the cap limit of 100 mg/nm 3 10% O 2.

41 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 24 of Unit No. 2 Airflow to Gas Flow Correlation In addition to the measurement of the particulate emissions, gas volume flow rates were also determined during this correlation period. The measured gas volume flow rates, which ranged from to Nm 3 /s 10% O 2, were correlated against the plants corresponding Total Air flow Rates to produce the following correlation with a coefficient of The following trends indicate Boiler load and Total Air Flow captured during Measurement No. 1 and demonstrates the typical load and air flow stability experienced during the correlation period.

42 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 25 of 131 Plant parameters and trends for each measurement have been presented in Appendix No. 3. The corresponding stack gas velocity data captured during Measurement No. 1 produced the following profile. The minimum, maximum and average gas velocity for this measurement was recorded as and 31.8 m/s respectively. The minimum and maximum deviation from the Average velocity is therefore 8.7 & 5.6 % respectively.

43 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 26 of Unit No. 4 Particulate Emission Correlation The correlation on Unit No 4 was completed form the 13 th to the 17 th of June A total of twelve measurements were conducted of which six measurements were included in the final particulate emission monitor correlation for Output No. 1 and twelve for the correlation for Output No. 2. Measurements No. 1, 2, 4, 5, 7 &12 were excluded from the correlation for Output No. 1 as a result of monitor signal saturation on the first output. The following trends indicate the particulate emission monitor signals captured during Measurement No. 7 on the 15 th of June 2016 with 619 MW boiler loading. The trends show the saturated signal on Output No. 1 and the normal trend from Output No. 2. The outputs settings have been set to 0 to 0.03 extinction on Output No. 1 and 0 to 2.0 extinction on Output No. 2. The measured particulate emission concentrations on Unit No. 4, included in the correlation for Output No. 1, ranged from 37.9 to 67.1 mg/nm 3 10% O 2 and for output No. 2 ranged from 37.9 to mg/nm 3 10% O 2. The maximum measured emission of mg/nm 3 10% O2 was above the negotiated cap value of 100 mg/nm 3 10% O 2. The corresponding particulate emission monitor signals, recorded from Output No. 1, ranged from 13.7 to 18.7 ma. The resulting co-ordinates produced the following correlation with a

44 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 27 of 131 correlation coefficient of 0.988, which falls within the standards tolerance of 0.95 to A correlation derived for Output No. 2 based on the monitor settings of 0 to 2.0 extinction is presented in the following Figure. This correlation also complies with the requirements of the ISO 10155, and includes the cap limit of 100 mg/nm 3 10% O 2.

45 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 28 of Unit No. 4 Airflow to Gas Flow Correlation In addition to the measurement of the particulate emissions, gas volume flow rates were also determined during this correlation period. The measured gas volume flow rates, which ranged from to Nm 3 /s 10% O 2, were correlated against the plants corresponding Total Air flow Rates to produce the following correlation with a coefficient of The following trends indicate Boiler load and Total Air Flow captured during Measurement No. 6 and demonstrates the typical load and air flow stability experienced during the correlation period.

46 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 29 of 131 Plant parameters and trends for each measurement have been presented in Appendix No. 3. The corresponding stack gas velocity data captured during Measurement No. 1 produced the following profile. The minimum, maximum and average gas velocity for this measurement was recorded as 25.9, 34.8 & 31.8 m/s respectively. The minimum and maximum deviation from the Average velocity is therefore 18.6 & 9.7 % respectively.

47 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 30 of Unit No. 4 Particulate Matter Size Distribution In addition to the correlations for the particulate emissions and the gas flows, a set of extended measurements were conducted on Unit No. 4 during the 23 rd and 24 th of March of The purpose of these extended measurements was to provide sufficient particulate matter, from the stack gas, for a particle size analysis. The collated particulates from all the measurements conducted on the 23 rd and 24 th of March were combined into one sample. The following figure and tables, take from the lab report, presents the particle size distribution determined from this sample.

48 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 31 of 131 The results show that approximately 20% of the particles fall below 1 µm, 63% fall below 2.5 µm and 95% fall below 10µm. The remaining 5% of particles fall between 10 and 100 µm. The full lab sheet has been presented in Appendix No Unit No. 5 Particulate Emission Correlation The correlation on Unit No 5 was completed form the 12 th to the 17 th of December A total of fifteen measurements were conducted of which only three measurements were included in the final particulate emission monitor correlation for Output No. 1. All fifteen measurements were however included in the correlation for Output No. 2. Only data from Measurements No. 7, 12 & 15 could be included in the correlation for Output No. 1 as these were the only three measurements where the monitor signal did not saturate the first output. The following trends indicate the particulate emission monitor signals captured during Measurement No. 1 on the 12 th of December 2015 with 602 MW boiler loading. The trends show the saturated signal on Output No. 1 and the normal trend from Output No. 2.

49 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 32 of 131 The outputs settings have been set to 0 to 0.03 extinction on Output No. 1 and 0 to 2.0 extinction on Output No. 2. The measured particulate emission concentrations on Unit No. 5, included in the correlation for Output No. 1, ranged from 65.8 to 77.3 mg/nm 3 10% O 2 and for output No. 2 ranged from 65.8 to mg/nm 3 10% O 2. The maximum measured emission of mg/nm 3 10% O2 was above the negotiated cap value of 100 mg/nm 3 10% O 2. The corresponding particulate emission monitor signals, recorded from Output No. 1, ranged from 18.2 to 19.8 ma. The resulting co-ordinates produced the following correlation with a correlation coefficient of 0.988, which falls within the standards tolerance of 0.95 to 1.05.

50 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 33 of 131 A correlation derived for Output No. 2 based on the monitor settings of 0 to 2.0 extinction is presented in the following Figure. This correlation also complies with the requirements of the ISO 10155, and includes the cap limit of 100 mg/nm 3 10% O 2.

51 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 34 of Unit No. 5 Airflow to Gas Flow Correlation In addition to the measurement of the particulate emissions, gas volume flow rates were also determined during this correlation period. The measured gas volume flow rates, which ranged from to Nm 3 /s 10% O 2, were correlated against the plants corresponding Total Air flow Rates to produce the following correlation with a coefficient of The following trends indicate Boiler load and Total Air Flow captured during Measurement No. 1 and demonstrates the typical load and air flow stability experienced during the correlation period.

52 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 35 of 131 Plant parameters and trends for each measurement have been presented in Appendix No. 3. The corresponding stack gas velocity data captured during Measurement No. 5 produced the following profile. The minimum, maximum and average gas velocity for this measurement was recorded as 22.3, 28.6 & 25.6 m/s respectively. The minimum and maximum deviation from the Average velocity is therefore 12.8 & 11.6 % respectively.

53 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 36 of Unit No. 6 Particulate Emission Correlation The correlation on Unit No 6 was completed form the 12 th to the 17 th of December A total of fifteen measurements were conducted of which eight measurements were included in the final particulate emission monitor correlation for Output No. 1. All fifteen measurements were however included in the correlation for Output No. 2. Measurements No. 1 to 6 & 13 were excluded from the correlation for Output No. 1 as a result of monitor signal saturation on the first output. The following trends indicate the particulate emission monitor signals captured during Measurement No. 2 on the 12 th of December 2015 with 602 MW boiler loading. The trends show the saturated signal on Output No. 1 and the normal trend from Output No. 2. The outputs settings have been set to 0 to 0.03 extinction on Output No. 1 and 0 to 2.0 extinction on Output No. 2. The measured particulate emission concentrations on Unit No.6, included in the correlation for Output No. 1, ranged from 18.7 to 44.8 mg/nm 3 10% O 2 and for output No. 2 ranged from 18.7 to mg/nm 3 10% O 2. The maximum measured emission of mg/nm 3 10% O2 was above the negotiated cap value of 100 mg/nm 3 10% O 2. The corresponding particulate emission monitor signals, recorded from Output No. 1, ranged

54 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 37 of 131 from 9.9 to 16.6 ma. The resulting co-ordinates produced the following correlation with a correlation coefficient of 0.995, which falls within the standards tolerance of 0.95 to A correlation derived for Output No. 2 based on the monitor settings of 0 to 2.0 extinction is presented in the following Figure. This correlation also complies with the requirements of the ISO 10155, and includes the cap limit of 100 mg/nm 3 10% O 2.

55 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 38 of Unit No. 6 Airflow to Gas Flow Correlation In addition to the measurement of the particulate emissions, gas volume flow rates were also determined during this correlation period. The measured gas volume flow rates, which ranged from to Nm 3 /s 10% O 2, were correlated against the plants corresponding Total Air flow Rates to produce the following correlation with a coefficient of The following trends indicate Boiler load and Total Air Flow captured during Measurement No. 2 and demonstrates the typical load and air flow stability experienced during the correlation period.

56 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 39 of 131 Plant parameters and trends for each measurement have been presented in Appendix No. 3. The corresponding stack gas velocity data captured during Measurement No. 2 produced the following profile. The minimum, maximum and average gas velocity for this measurement was recorded as 27.4, 37.7 & 33.8 m/s respectively. The minimum and maximum deviation from the Average velocity is therefore 19.0 & 11.5 % respectively.

57 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 40 of Unit No. 4 Start Up or Light Up Measurements On the 16th of March 2016 a set of three measurements were conducted on Unit No. 4 during a Unit Light Up/Start Up. The first two measurements were conducted prior to synchronisation and the third during the load ramping from 130 to 350 MW. The following trends and tables show the Boiler Load, Ait flow & Mill PF flow variation during the measurement period.

58 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 41 of 131 Measurement No. 1 Load Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow Total air flow Total air flow MW US- 04NM10U 603-C153 US- 04NM20U 603-C157 US- 04NM30U 603-C161 US- 04NM40U 603-C165 US- 04NM50U 603-C169 US- 04NM60U 603-C173 The following table presents the conditions as captured during Measurement No. 1. US- 04NG00F6 00-C90 US- 04NG00F6 00-C90 Average Max Min :45: :50: :55: :00: :05: :10: :15: :20: :25: :30: :35: :40: :45: :50: :55: :00: :05: :10: :15: Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass Test No. MW % ma mg/nm 3 Stack O >

59 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 42 of 131 Measurement No. 2 Load Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow Total air flow MW US- 04NM10U 603-C153 US- 04NM20U 603-C157 US- 04NM30U 603-C161 US- 04NM40U 603-C165 US- 04NM50U 603-C169 US- 04NM60U 603-C173 US- 04NG00F6 00-C90 Average Max Min :00: :05: :10: :15: :20: :25: :30: :35: :40: :45: :50: :55: :00: :05: :10: :15: The following table presents the conditions as captured during Measurement No. 2. Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass Test No. MW % ma mg/nm 3 Stack O >

60 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 43 of 131 Measurement No. 3 Load Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow Total air flow MW US- 04NM10U 603-C153 US- 04NM20U 603-C157 US- 04NM30U 603-C161 US- 04NM40U 603-C165 US- 04NM50U 603-C169 The following table presents the conditions as captured during Measurement No. 3.. US- 04NM60U 603-C173 US- 04NG00F6 00-C90 Average Max Min :45: :50: :55: :00: :05: :10: :15: :20: :25: :30: :35: :40: :45: :50: :55: :00: :05: Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass Test No. MW % ma mg/nm 3 Stack O >

61 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 44 of Unit No. 6 Shutdown Measurements On the 27 th of June 2016 two measurements were conducted on Unit No. 6 during a Unit Shutdown. The first measurement was conducted during the load reduction from 270 to 0 MW. Measurement No. 2 was conducted after with zero MW load and with just fans running. The following trends and tables show the Boiler Load, Mill PF flow variation during the measurement period.

62 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 45 of 131 Measurement No. 1 Load Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow MW US- 06NM10U 603-C153 US- 06NM20U 603-C157 US- 06NM30U 603-C161 US- 06NM40U 603-C165 US- 06NM50U 603-C169 The following table presents the conditions as captured during Measurement No. 2. US- 06NM60U 603-C173 Average Max Min :40: :45: :50: :55: :00: :05: :10: :15: :20: :25: :30: :35: :40: :45: :50: :55: :00: :05: :10:

63 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 46 of 131 Measurement No. 2 Load Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow Total air flow MW US- 04NM10U 603-C153 US- 04NM20U 603-C157 US- 04NM30U 603-C161 US- 04NM40U 603-C165 US- 04NM50U 603-C169 US- 04NM60U 603-C173 US- 04NG00F6 00-C90 Average Max Min :00: :05: :10: :15: :20: :25: :30: :35: :40: :45: :50: :55: :00: :05: :10: :15: The following table presents the conditions as captured during Measurement No. 1 & 2 with the particulate concentration in mg/nm 3 stack O 2 conditions. Boiler Load Stack Oxygen Monitor Output (0 to 2 Ext) Output No Correlation Measured Dust Mass Test No. MW % ma mg/nm 3 Stack O > >

64 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 47 of Monitoring Deviations 6.1. The numbers of measurements included in some of the correlations are inconsistent with the requirements of the ESKOM Standard for Emission Monitoring and Reporting ( ). 7. Recommendations It is recommended that: 7.1. The particulate emissions from Units No. 1, 2, 4, 5 & 6, reported to the authorities, are according to the correlation functions presented in Figures No. 1 to 10 of this report New compliant correlations are conducted on Units No. 1, 2, 4, 5 & 6 during the first quarter of The first Output range on Unit No. 1 to 6 be selected to a higher extinction range in order to include the cap limit of 100 mg/nm 3 10% O Acknowledgement The author expresses sincere appreciation for the co-operation and assistance of the Lethabo personnel during the correlation. 9. References 9.1. South African Air Quality Act No. 39 of ISO 9096 Stationary source emission Manual Determination of mass concentration of particulate matter ISO Stationary source emission Determination of concentration of particulate matter (dust) at low concentrations Manual gravimetric method ISO Stationary source emissions Automated monitoring of mass concentrations of particles Performance characteristics, test methods and specifications ESKOM Standard for Emission Monitoring and Reporting 10. Distribution Yaseen Waja Eskom Lethabo Power Station Ebrahim Patel Eskom Enterprises Park R Rampiar Eskom Enterprises Park

65 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 48 of 131 Appendix No. 1 Detailed Measurement Results

66 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 49 of 131 Units No. 1 Table No. 1 Measurements No. 1 to 5 Date 9 th to 16 th March 2016 Customer Name Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2016/03/ /03/ /03/ /03/ /03/16 Start Time 00H00 11H16 15H06 12H07 13H53 15H35 End Time 00H00 13H38 16H20 13H25 15H07 16H47 Plant Load MW Monitor Type Particulate Serial No. M CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FQ3 FQ4 FQ5 FQ6 FQ7 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust Concentration@ 10% O 2 mg/am 3 (wet) Dust Concentration@ 10% O 2 mg/nm 3 (wet) Dust Concentration@ 10% O 2 mg/am 3 (dry) Dust Concentration@ 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/nm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

67 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 50 of 131 Units No. 1 Table No. 2 Measurements No. 6 to 10 Date 17 th to 19 th March 2016 Customer Name Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2016/03/ /03/ /03/ /03/ /03/19 Start Time 00H00 23H44 01H29 03H07 23H45 01H33 End Time 00H00 00H56 02H41 04H20 00H57 02H48 Plant Load MW Monitor Type Particulate Serial No. M CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FQ8 FQ9 FQ10 FQ11 FQ12 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust Concentration@ 10% O 2 mg/am 3 (wet) Dust Concentration@ 10% O 2 mg/nm 3 (wet) Dust Concentration@ 10% O 2 mg/am 3 (dry) Dust Concentration@ 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/nm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

68 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 51 of 131 Units No. 1 Table No. 3 Measurements No. 11 Date 19 th March 2016 Customer Name Lethabo Unit No. 1 Location Stack Measurement No. 11 Date yyyy/mm/dd 2016/03/19 Start Time 00H00 03H20 End Time 00H00 04H39 Plant Load MW 401 Monitor Type Particulate Serial No. 1 CU R Range No. 1 Ext 0.30 Range No. 2 Ext 2.00 Average Range No. 1 ma 7.3 Average Range No. 2 ma 4.5 Ambient Temperature C 24.7 Gas Temperature C 115 Barometric pressure kpa (g) 84.6 Duct pressure Pa Duct pressure kpa (abs) 84.4 Moisture Mass mg 90.0 Moisture %v/v 6.0 Oxygen % 8.2 Nozzle diameter mm 7.0 Sample Time min 60 Thimbles used FQ13 Total Dust Mass g Velocity m/s 22.7 Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust Concentration@ 10% O 2 mg/am 3 (wet) 12.6 Dust Concentration@ 10% O 2 mg/nm 3 (wet) 21.5 Dust Concentration@ 10% O 2 mg/am 3 (dry) 13.4 Dust Concentration@ 10% O 2 mg/nm 3 (dry) 22.9 Outlet Dust Flowrate g/s 10.9 Stack Diameter m 6.4 Duct Area m Moisture Concentration mg/nm 3 (dry) 51.6 Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

69 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 52 of 131 Units No. 2 Table No. 4 Measurements No. 1 to 5 Date 19 th & 20 th December 2015 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/20 Start Time 00H00 13H12 14H57 09H30 11H20 13H00 End Time 00H00 14H25 16H07 10H45 12H30 14H15 Load MW Monitor Type SICK Serial No. M CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FP1 FP2 FP3 FP4 FP5 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

70 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 53 of 131 Units No. 2 Table No. 5 Measurements No. 6 to 10 Date 21 st & 22 nd December 2015 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/22 Start Time 00H00 09H41 11H18 12H58 23H29 01H36 End Time 00H00 10H51 12H28 14H10 01H12 02H46 Load MW Monitor Type Serial No. Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FP6 FP7 FP8 FP9 FP10 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa. Measurement No. 9 was excluded from all correlations as a result of a failed or burst filter. SICK M CU R

71 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 54 of 131 Units No. 2 Table No. 6 Measurements No. 11 to 14 Date 22 nd & 23 rd December 2015 Customer Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/23 Start Time 00H00 03H12 00H19 02H03 03H59 End Time 00H00 04H21 01H29 3H23 05H15 Load MW Monitor Type Serial No. Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FP11 FP12 FP13 FP14 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) n/a Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa. Measurement No. 14 was excluded from the particulate emission monitor correlations as a result of a damaged filter. SICK M CU R

72 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 55 of 131 Unit No. 4 Table No. 7 Measurements No. 1 to 5 Date 13 th & 14 th June 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 216/06/13 216/06/ /06/ /06/ /06/14 Start Time 00H00 11H09 13H00 15H35 11H30 13H18 End Time 00H00 12H36 15H05 16H48 12H40 14H27 Load MW Monitor Type Durag D-R 290 M Serial No. M-***6 8*09 CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used GA 1 GA2 GA3 GA 5 GA 6 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

73 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 56 of 131 Unit No. 4 Table No. 8 Measurements No. 6 to 10 Date 14 th to 16 th June 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2016/06/ /06/ /06/ /06/ /06/16 Start Time 00H00 14H52 10H04 11H39 13H13 21H38 End Time 00H00 16H04 11H15 12H49 14H24 22H51 Load MW Monitor Type OMD41 Serial No. M-###6 8#09 CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used GA 7 GA 8 GA 9 GA 10 GA 11 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

74 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 57 of 131 Unit No. 4 Table No. 9 Measurements No. 11 & 12 Date 16 th & 17 th June 2016 Customer Lethabo Lethabo Unit No. 4 4 Location Stack Stack Measurement No Date yyyy/mm/dd 2016/06/ /06/17 Start Time 00H00 23H11 00H40 End Time 00H00 00H20 01H49 Load MW Monitor Type OMD41 Serial No. 9 CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used GA 12 GA 13 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

75 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 58 of 131 Unit No. 5 Table No. 10 Measurements No. 1 to 5 Date 12 & 14 th December 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/14 Start Time 00H00 10H05 12H30 14H20 10H05 12H25 End Time 00H00 11H50 13H48 15H42 11H50 13H43 Load MW Monitor Type SICK Serial No. M R Cu Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FS1 FS2 FS3 FS4 FS5 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/nm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

76 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 59 of 131 Unit No. 5 Table No. 11 Measurements No. 6 to 10 Date 14 th & 15 th December 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/15 Start Time 00H00 14H40 10H25 12H10 14H00 22H40 End Time 00H00 15H58 11H40 13H29 15H20 00H00 Load MW Monitor Type SICK Serial No. M R Cu Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FS6 FS7 FS8 FS9 FS10 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/nm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

77 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 60 of 131 Unit No. 5 Table No. 12 Measurements No. 11 to 15 Date 16 th & 17 th December 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/17 Start Time 00H00 00H40 02H36 23H55 02H00 04H10 End Time 00H00 01H57 03H50 01H11 03H25 05H25 Load MW Monitor Type SICK Serial No. M R Cu Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FS11 FS12 FS13 FS14 FS15 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/nm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

78 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 61 of 131 Unit No. 6 Table No. 13 Measurements No. 1 to 5 Date 12 th & 14 th December 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No. Unit 6 Unit 6 Unit 6 Unit 6 Unit 6 Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/14 Start Time 00H00 10H06 14H38 16H34 10H13 12H27 End Time 00H00 11H51 15H58 17h49 11H51 13H44 Load MW Monitor Type SICK Serial No. M CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FR1 FR2 FR3 FR4 FR5 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

79 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 62 of 131 Unit No. 6 Table No. 14 Measurements No. 6 to 10 Date 14 th & 15 th December 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No. Unit 6 Unit 6 Unit 6 Unit 6 Unit 6 Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/14 Start Time 00H00 14H40 10H23 12H11 14H04 22H42 End Time 00H00 15H58 11H38 13H27 15H23 00H01 Load MW Monitor Type SICK Serial No. M CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FR6 FR7 FR8 FR9 FR10 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

80 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 63 of 131 Unit No. 6 Table No. 15 Measurements No. 11 to 15 Date 16 th & 17 th December 2016 Customer Lethabo Lethabo Lethabo Lethabo Lethabo Unit No. Unit 6 Unit 6 Unit 6 Unit 6 Unit 6 Location Stack Stack Stack Stack Stack Measurement No Date yyyy/mm/dd 2015/12/ /12/ /12/ /12/ /12/17 Start Time 00H00 00H39 02H37 23H57 02H00 04H11 End Time 00H00 01H55 03H49 01H13 03H24 05H23 Load MW Monitor Type SICK Serial No. M CU R Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FR11 FR12 FR13 FR14 FR15 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

81 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 64 of 131 Unit No. 4 Table No. 16 Measurements No. 1 to 3 Start Up/Light Up Date 16 th & 17 th December 2016 Customer Name Lethabo Lethabo Lethabo Plant Name or No Location Stack Stack Stack Measurement No Date yyyy/mm/dd 2016/03/ /03/ /03/16 Start Time 00H00 11H45 14H00 15H45 End Time 00H00 13H15 15H15 17H05 Plant Load MW Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FO 13 FO 14 FO 15 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust Concentration mg/am 3 (wet) Dust Concentration mg/nm 3 (wet) Dust Concentration mg/am 3 (dry) Dust Concentration mg/nm 3 (dry) Dust 10 % O 2 mg/am 3 (wet) Dust 10 % O 2 mg/nm 3 (wet) Dust 10 % O 2 mg/am 3 (dry) Dust 10 % O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

82 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 65 of 131 Unit No. 6 Table No. 17 Measurements No. 1 & 2 Shutdown Date 16 th & 17 th December 2016 Customer Lethabo Lethabo Unit No. 6 6 Location Stack Stack Measurement No. 1 2 Date yyyy/mm/dd 2016/06/ /06/27 Start Time 00H00 20H42 22H48 End Time 00H00 22H09 00H05 Load MW 55 0 Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used GA14 & 15 GB2 & 3 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust Concentration mg/am 3 (wet) Dust Concentration mg/nm 3 (wet) Dust Concentration mg/am 3 (dry) Dust Concentration mg/nm 3 (dry) Dust 10 % O 2 mg/am 3 (wet) Dust 10 % O 2 mg/nm 3 (wet) Dust 10 % O 2 mg/am 3 (dry) Dust 10 % O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/nm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

83 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 66 of 131 Unit No. 4 Table No. 18 Measurements No. A1-3 & A4-6 For Particle Size Samples Date 23 rd & 24 th March 2016 Customer Name Lethabo Lethabo Plant Name or No. 4 4 Location Stack Stack Measurement No. A1-3 A4-6 Date yyyy/mm/dd 2016/03/ /03/24 Start Time 00H00 10H54 09H54 End Time 00H00 15H03 14H05 Plant Load MW Monitor Type Serial No. Sick M-###6 8#09 CU R-0 Range No. 1 Ext Range No. 2 Ext Average Range No. 1 ma Average Range No. 2 ma Ambient Temperature C Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Nozzle diameter mm Sample Time min Thimbles used FT 9 FT10 Total Dust Mass g Velocity m/s Gas Volume Flow Am 3 /s Gas Volume Flow Nm 3 /s Gas Volume Flow Dry Am 3 /s (d) Gas Volume Flow Dry Nm 3 /s (d) Gas Volume Flow 10% O 2 Nm 3 /s Dust 10% O 2 mg/am 3 (wet) Dust 10% O 2 mg/nm 3 (wet) Dust 10% O 2 mg/am 3 (dry) Dust 10% O 2 mg/nm 3 (dry) Outlet Dust Flowrate g/s Stack Diameter m Duct Area m Moisture Concentration mg/sm 3 (dry) Isokineticity % Dust Concentration [mg/nm 3 ] is the measured dust concentration Normalised to gas conditions at 0 C and 101,325 kpa.

84 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 67 of 131 Appendix No. 2 Plant Parameters

85 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 68 of 131 Unit No. 1 Table No. 19 Plant parameters Emission Output 1 Emission Output 2 Emission Output 1 Emission Output 2 Load Total PA flow Total Steam Flow LH Sec A/h Tout_gas RH Sec A/h Tout_gas LH Prim A/h Tout_gas RH Prim A/h Tout_gas Econ Tout_gas1 Econ Tout_gas3 HP condenser steam P1 Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow

86 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 69 of 131 Unit No. 1 Table No. 20 Plant parameters Mill A PF Mill B PF Mill C PF Mill D PF Mill E PF Mill F PF SO3 Total air flow Sulphur to burner Sulphur cntrl v/v Comb air cntrl v/v Comb air cntrl v/v Ref A heater Temp Comb Temp Mixing chamber Tout Conv 1 stage Tin Conv 1 stge Tout Conv 2 stage Tin Conv 2 stge Tout Cntrl v/v 2 stage C8l air Conv 2 stage C8l air flow

87 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 70 of 131 Unit No. 1 Table No. 21 Plant parameters Heater Amps Act Air Blower Freq Act Air Blower Freq Ref LH ID Fan current RH ID Fan current Oxygen 1 Oxygen 2 Total air flow

88 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 71 of 131 Unit No. 2 Table No. 22 Plant parameters Load Total air flow Total Steam Flow Total PA flow LH Sec A/h Tout_gas RH Sec A/h Tout_gas LH Prim A/h Tout_gas RH Prim A/h Tout_gas Econ Tout_gas1 Econ Tout_gas

89 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 72 of 131 Unit No. 2 Table No. 23 Plant parameters Oxygen 1 Oxygen 2 LH ID Fan current RH ID Fan current Emissions Output 1 Emissions Output 2 Emissions Output 1 Emissions Output 2 n/a SO3 Total air flow n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 861.5

90 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 73 of 131 Unit No. 2 Table No. 24 Plant parameters Sulphur to burner Sulphur cntrl v/v Comb air cntrl v/v Comb air cntrl v/v Ref A heater Temp Comb Temp Mixing chamber Tout Conv 1 stage Tin Conv 1 stge Tout Conv 2 stage Tin

91 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 74 of 131 Unit No. 2 Table No. 25 Plant parameters Conv 2 stge Tout Cntrl v/v 2 stage C8l air Conv 2 stage C8l air flow Heater Amps Act Air Blower Freq Act Air Blower Freq Ref 0 Mill A PA Mill B PA Mill C PA

92 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 75 of 131 Unit No. 2 Table No. 26 Plant parameters Mill D PA Mill E PA Mill F PA Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow HP condenser steam P

93 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 76 of 131 Unit No. 4 Table No. 27 Plant parameters Emissions Output 1 Emissions Output 2 Emissions Output 1 Emissions Output 2 Load Total PA flow Total Steam Flow LH Sec A/h Tout_gas RH Sec A/h Tout_gas LH Prim A/h Tout_gas RH Prim A/h Tout_gas Econ Tout_gas1 Econ Tout_gas3 HP condenser steam P1 Mill A PF flow Mill B PF flow Mill C PF flow Mill D PF flow Mill E PF flow Mill F PF flow

94 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 77 of 131 Unit No. 4 Table No. 28 Plant parameters Mill A PF Mill B PF Mill C PF Mill D PF Mill E PF Mill F PF SO3 Total air flow Sulphur to burner Sulphur cntrl v/v Comb air cntrl v/v Comb air cntrl v/v Ref A heater Temp Comb Temp Mixing chamber Tout Conv 1 stage Tin Conv 1 stge Tout Conv 2 stage Tin Conv 2 stge Tout Cntrl v/v 2 stage C8l air Conv 2 stage C8l air flow

95 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 78 of 131 Unit No. 4 Table No. 29 Plant parameters Heater Amps Act Air Blower Freq Act Air Blower Freq Ref Lance Temp 1 Lance Temp 2 Lance Temp 3 Lance Temp 4 Lance Temp 5 Lance Temp 6 Lance Temp Lance Temp 8 Lance Temp 9 Lance Temp 10 Lance Temp 11 Lance Temp 12 Lance Temp 13 Lance Temp 14 Lance Temp 15 Lance Temp 16 LH ID Fan current

96 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 79 of 131 Unit No. 4 Table No. 30 Plant parameters RH ID Fan current Oxygen 1 Oxygen 2 Mill A PA Mill B PA Mill C PA Mill D PA Mill E PA Mill F PA Total air flow

97 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 80 of 131 Unit No. 5 Table No. 31 Plant parameters Boiler Load Air Flow Total PA flow Total Steam Flow Oxygen 1 Oxygen 2 Emissions Output 1 Emissions Output 2 Emissions Output 1 Emissions Output

98 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 81 of 131 Unit No. 5 Table No. 32 Plant parameters LH Sec A/h Tout_gas RH Sec A/h Tout_gas LH Prim A/h Tout_gas RH Prim A/h Tout_gas Econ Tout_gas1 Econ Tout_gas3 HP condenser steam P1 Mill A PF flow Mill B PF flow Mill C PF flow

99 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 82 of 131 Unit No. 5 Table No. 33 Plant parameters Mill D PF flow Mill E PF flow Mill F PF flow SO3 Total air flow Sulphur to burner Sulphur cntrl v/v Comb air cntrl v/v Comb air cntrl v/v Ref A heater Temp Comb Temp

100 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 83 of 131 Unit No. 5 Table No. 34 Plant parameters Mixing chamber Tout Conv 1 stage Tin Conv 1 stge Tout Conv 2 stage Tin Conv 2 stge Tout Cntrl v/v 2 stage C8l air Conv 2 stage C8l air flow Heater Amps Act Air Blower Freq Act Air Blower Freq Ref

101 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 84 of 131 Unit No. 5 Table No. 35 Plant parameters LH ID Fan current RH ID Fan current

102 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 85 of 131 Unit No. 6 Table No. 36 Plant parameters Boiler Load Air Flow Total PA flow Total Steam Flow Oxygen 1 Oxygen 2 Emissions Output 1 Emissions Output 2 Emissions Output 1 Emissions Output

103 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 86 of 131 Unit No. 6 Table No. 37 Plant parameters LH Sec A/h Tout_gas RH Sec A/h Tout_gas LH Prim A/h Tout_gas RH Prim A/h Tout_gas Econ Tout_gas1 Econ Tout_gas3 HP condenser steam P1 Mill A PF flow Mill B PF flow Mill C PF flow

104 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 87 of 131 Unit No. 6 Table No. 38 Plant parameters Mill D PF flow Mill E PF flow Mill F PF flow SO3 Total air flow Sulphur to burner Sulphur cntrl v/v Comb air cntrl v/v Comb air cntrl v/v Ref A heater Temp Comb Temp

105 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 88 of 131 Unit No. 6 Table No. 39 Plant parameters Mixing chamber Tout Conv 1 stage Tin Conv 1 stge Tout Conv 2 stage Tin Conv 2 stge Tout Cntrl v/v 2 stage C8l air Conv 2 stage C8l air flow Heater Amps Act Air Blower Freq Act Air Blower Freq Ref

106 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 89 of 131 Unit No. 6 Table No. 40 Plant parameters LH ID Fan current RH ID Fan current

107 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 90 of 131 Unit No. 4 Table No. 41 Plant parameters for Unit Start Up/Light Up and Particle Size Measurements Emissions Emissions Emissions Emissions Total Steam LH Sec A/h RH Sec A/h LH Prim A/h Load Total PA flow Output 1 Output 2 Output 1 Output 2 Flow Tout_gas Tout_gas Tout_gas Start Up No Start Up No Start Up No A A RH Prim A/h Econ Econ HP Mill A PF Mill D PF Mill B PF flow Mill C PF flow Tout_gas Tout_gas1 Tout_gas3 condenser flow flow Mill E PF flow Mill F PF flow Start Up No Start Up No Start Up No A A Mill A PF Mill B PF Mill C PF Mill D PF Mill E PF Mill F PF SO3 Total air Sulphur to Sulphur cntrl Comb air flow burner v/v cntrl v/v Start Up No Start Up No Start Up No A A

108 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 91 of 131 Unit No. 4 Table No. 42 Plant parameters for Unit Start Up/Light Up and Particle Size Measurements Comb air A heater Mixing Conv 1 stage Conv 1 stge Conv 2 stage Conv 2 stge Cntrl v/v 2 Conv 2 stage Comb Temp cntrl v/v Ref Temp chamber Tin Tout Tin Tout stage C8l air C8l air flow Start Up No Start Up No Start Up No A A Heater Amps Air Blower Air Blower Act Freq Act Freq Ref Lance Temp 1 Lance Temp 2 Lance Temp 3 Lance Temp 4 Lance Temp 5 Lance Temp 6 Lance Temp 7 Start Up No Start Up No Start Up No A A Lance Temp 8 Lance Temp 9 Lance Temp Lance Temp Lance Temp Lance Temp Lance Temp Lance Temp Lance Temp LH ID Fan current Start Up No Start Up No Start Up No A A

109 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 92 of 131 Unit No. 4 Table No. 43 Plant parameters for Unit Start Up/Light Up and Particle Size Measurements RH ID Fan current Oxygen 1 Oxygen 2 Mill A PA Mill B PA Mill C PA Mill D PA Mill E PA Mill F PA Total air flow Start Up No Start Up No Start Up No A A

110 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 93 of 131 Unit No. 6 Table No. 44 Plant parameters for Unit Shutdown Measurements Emissions Emissions Emissions Emissions Total Steam LH Sec A/h RH Sec A/h LH Prim A/h Load Total PA flow Output 1 Output 2 Output 1 Output 2 Flow Tout_gas Tout_gas Tout_gas RH Prim A/h Econ Econ HP Mill A PF Mill D PF Mill B PF flow Mill C PF flow Tout_gas Tout_gas1 Tout_gas3 condenser flow flow Mill E PF flow Mill F PF flow SO3 Total air Sulphur to Sulphur cntrl Comb air Comb air A heater Mixing Conv 1 stage Conv 1 stge Comb Temp flow burner v/v cntrl v/v cntrl v/v Ref Temp chamber Tin Tout Conv 2 stage Conv 2 stge Cntrl v/v 2 Conv 2 stage Heater Amps Air Blower Air Blower Tin Tout stage C8l air C8l air flow Act Freq Act Freq Ref Lance Temp 1 Lance Temp 2 Lance Temp Lance Temp 4 Lance Temp 5 Lance Temp 6 Lance Temp 7 Lance Temp 8 Lance Temp 9 Lance Temp Lance Temp Lance Temp Lance Temp Lance Temp Lance Temp Lance Temp LH ID Fan RH ID Fan current current Oxygen 1 Oxygen 2 Mill A PA Mill B PA Mill C PA

111 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 94 of 131 Unit No. 6 Table No. 45 Plant parameters for Unit Shutdown Measurements Mill D PA Mill E PA Mill F PA

112 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 95 of 131 Appendix No. 3 Correlation Graphs

113 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 96 of 131 Lethabo Power Station Unit No. 1 Particulate Emission Monitor Correlation March 2016 Output No. 1 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 12.6 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 58.1 [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 8 th March 2016 Correlation dates: 9 th to 19 th March 2016 Correlation Coefficient: 0.97 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 1 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

114 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 97 of 131 Lethabo Power Station Unit No. 1 Particulate Emission Monitor Correlation March 2016 Output No. 2 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 12.6 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 58.1 [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 2.0 Ext Output No. 2 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 8 th March 2016 Correlation dates: 9 th to 19 th March 2016 Correlation Coefficient: 0.97 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 2 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

115 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 98 of 131 Lethabo Power Station Unit No. 2 Particulate Emission Monitor Correlation December 2015 Output No. 1 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 11.6 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 83.3 [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 18 th December 2015 Correlation dates: 19th to 23rd December 2015 Correlation Coefficient: 0.99 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 3 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

116 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 99 of 131 Lethabo Power Station Unit No. 2 Particulate Emission Monitor Correlation December 2016 Output No. 2 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 11.6 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 91.2 [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 18 th December 2015 Correlation dates: 19th to 23rd December 2015 Correlation Coefficient: 0.99 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 4 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

117 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 100 of 131 Lethabo Power Station Unit No. 4 Particulate Emission Monitor Correlation June 2016 Output No. 1 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 37.1 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 67.1 [mg/nm 3 10% O 2] Serial Number: ***68*09 Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 12 th June 2016 Correlation dates: 13 th to 17 th June 2016 Correlation Coefficient: 0.98 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 7 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

118 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 101 of 131 Lethabo Power Station Unit No. 4 Particulate Emission Monitor Correlation June 2016 Output No. 2 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 37.9 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: [mg/nm 3 10% O 2] Serial Number: ***68*09 Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 12 th June 2016 Correlation dates: 13 th to 17 th June 2016 Correlation Coefficient: 0.98 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 8 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

119 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 102 of 131 Lethabo Power Station Unit No. 5 Particulate Emission Monitor Correlation December 2015 Output No. 1 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 65.8 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 77.3 [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 11 th Dec 2015 Correlation dates: 12 th to 17 th Dec 2015 Correlation Coefficient: 0.70 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 9 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

120 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 103 of 131 Lethabo Power Station Unit No. 5 Particulate Emission Monitor Correlation December 2015 Output No. 2 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 65.8 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 11 th Dec 2015 Correlation dates: 12 th to 17 th Dec 2015 Correlation Coefficient: 0.99 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 10 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

121 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 104 of 131 Lethabo Power Station Unit No. 6 Particulate Emission Monitor Correlation December 2015 Output No. 1 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/Nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 18.7 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: 44.8 [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 11 th Dec 2015 Correlation dates: 12 th to 17 th Dec 2015 Correlation Coefficient: 0.97 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 11 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

122 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 105 of 131 Lethabo Power Station Unit No. 6 Particulate Emission Monitor Correlation December 2015 Output No. 2 Plant: Lethabo PS Operational data: Location: Stack Operating Range: [mg/nm 3 10% O 2] Monitor information: Limits of validity: [as an hourly average] Make of Monitor: Sick Lower limit: 18.7 [mg/nm 3 10% O 2] Model: OMD 41-M221 Upper limit: [mg/nm 3 10% O 2] Serial Number: Linear function: E = * x Monitor setting: 0 to 0.3 Ext Output No. 1 where: E = Emission [mg/nm 3 O 2] Dates: x = Monitor output [ma] Calibration date: 11 th Dec 2015 Correlation dates: 12 th to 17 th Dec 2015 Correlation Coefficient: 0.99 Note: All measurements conducted with quartz filters. This correlation was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 12 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

123 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 106 of 131 Lethabo Power Station Unit No 1 Air Flow to Gas flow Correlation March 2016 Plant: Lethabo PS Operational data: Location: Stack Operating Range: 1000 Nm 3 /s Dry 10% O 2 Monitor information: Limits of validity : [as an hourly average] Make of Monitor: N/A Lower limit: Nm 3 /s Dry 10% O 2 Model: N/A Upper limit: Nm 3 /s Dry 10% O 2 Serial Number: N/A Linear function: E = * x Monitor setting: N/A where: E = Gas Flow [Nm 3 /s Dry 10% O 2] Dates: x = Total Air Flow [kg/s] Calibration date: N/A Correlation dates: 9th to 19th March 2016 Correlation Coefficient: 0.99 This correlation spot-check was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 13 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

124 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 107 of 131 Lethabo Power Station Unit No 2 Air Flow to Gas flow Correlation December 2015 Plant: Lethabo PS Operational data: Location: Stack Operating Range: 1000 Nm 3 /s Dry 10% O 2 Monitor information: Limits of validity : [as an hourly average] Make of Monitor: N/A Lower limit: Nm 3 /s Dry 10% O 2 Model: N/A Upper limit: Nm 3 /s Dry 10% O 2 Serial Number: N/A Linear function: E = * x Monitor setting: N/A where: E = Gas Flow [Nm 3 /s Dry 10% O 2] Dates: x = Total Air Flow [kg/s] Calibration date: N/A Correlation dates: 19 th to 23 rd Dec 2016 Correlation Coefficient: 0.99 This correlation spot-check was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 14 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

125 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 108 of 131 Lethabo Power Station Unit No 4 Air Flow to Gas flow Correlation June 2016 Plant: Lethabo PS Operational data: Location: Stack Operating Range: 1000 Nm 3 /s Dry 10% O 2 Monitor information: Limits of validity : [as an hourly average] Make of Monitor: N/A Lower limit: Nm 3 /s Dry 10% O 2 Model: N/A Upper limit: Nm 3 /s Dry 10% O 2 Serial Number: N/A Linear function: E = * x Monitor setting: N/A where: E = Gas Flow [Nm 3 /s Dry 10% O 2] Dates: x = Total Air Flow [kg/s] Calibration date: N/A Correlation dates: 13 th to 17 th June 2016 Correlation Coefficient: 0.99 This correlation spot-check was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 15 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

126 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 109 of 131 Lethabo Power Station Unit No 5 Air Flow to Gas flow Correlation December 2015 Plant: Lethabo PS Operational data: Location: Stack Operating Range: 1000 Nm 3 /s Dry 10% O 2 Monitor information: Limits of validity : [as an hourly average] Make of Monitor: N/A Lower limit: Nm 3 /s Dry 10% O 2 Model: N/A Upper limit: Nm 3 /s Dry 10% O 2 Serial Number: N/A Linear function: E = * x Monitor setting: N/A where: E = Gas Flow [Nm 3 /s Dry 10% O 2] Dates: x = Total Air Flow [kg/s] Calibration date: N/A Correlation dates: 12 th to 17 th Dec 2015 Correlation Coefficient: 0.99 This correlation spot-check was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 16 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

127 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 110 of 131 Lethabo Power Station Unit No 6 Air Flow to Gas flow Correlation December 2015 Plant: Lethabo PS Operational data: Location: Stack Operating Range: 1000 Nm 3 /s Dry 10% O 2 Monitor information: Limits of validity : [as an hourly average] Make of Monitor: N/A Lower limit: Nm 3 /s Dry 10% O 2 Model: N/A Upper limit: Nm 3 /s Dry 10% O 2 Serial Number: N/A Linear function: E = * x Monitor setting: N/A where: E = Gas Flow [Nm 3 /s Dry 10% O 2] Dates: x = Total Air Flow [kg/s] Calibration date: N/A Correlation dates: 12 th to 17 th Dec 2015 Correlation Coefficient: 0.99 This correlation spot-check was produced as described in the German VDI guide with reference to the zero point hypotheses. FIGURE 17 Prepared by: Stacklabs report No. RSL222 ISO 9096, & PH Pretorius ISO 9096:2003(E) Stacklabs ISO #:825268/: ISO 2003

128 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 111 of 131 Appendix No. 4 Water Vapour Concentration Calculation

129 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 112 of 131 Vwsg(std) = (Wf Wi) /ρ Where: Wf = Final weight of silica gel & inpinger (g) Wi = Initial weight of silica gel & inpinger (g) ρ = Density of water vapour at NTP (0.804 kg/m 3 ) Vwsg(std) = Volume of water vapour collected in silica gel (g) at NTP Where: Vwsg(std) Bws = Vwsg(std) + Vm(std) Bws = Proportion of water by volume %v/v Vm(std) = Dry gas volume measured by dry gas meter (Nm 3 dry)

130 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 113 of 131 Appendix No. 5 Outlines of Filter Weighing Procedure Pre-test Preparations Procedure Sampling System Integrity Checks And Sampling Procedures

131 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 114 of FILTER WEIGHING Before the test, the filters are prepared as follows: The required numbers of filters are marked with a unique number. The filters are then heated in an oven at 120 degrees Celsius for a period of one hour. After heating, all the filters are set out together with three reference filters in a dedicator where they will condition for a period of 48 hours. Each filter is then weighed three times, in a temperature controlled clean room, where the masses are captured on a dedicated computer system. Following the weighing process, the filters are packed and sealed into a separate container ready for use. The reference filters are treated in the same manner as those earmarked for the tests, but are not taken to site. After the site measurements, the used and reference filters are again set out in the desiccators and allowed to condition for up to 100 hours. The same weighing procedure is again followed and the final contaminant masses are calculated by the computer system. 2. PRE-TEST PREPARATIONS On site, the equipment is set up at the measuring location. The inside dimensions of the duct are determined. The number of test points per traverse is determined according to the standards and the sampling probe marked accordingly 3. SAMPLING SYSTEM INTEGRITY A leak check is performed on the impulse lines to ensure measurement integrity. With each change in filter or any other operation which might influence the integrity of the vacuum system, a vacuum check is performed. This ensures that only the gas which entered the nozzle will be measured by the gas test meter. Gaseous analysers are zero and span checked with calibration gas at the measurement points. 4. SAMPLING PROCEDURE Gas temperature, pressure and velocity head readings are logged at each sampling point. Velocity head readings are updated at intervals of 1 minute. During this time, the computer program calculates the orifice flow settings required for isokineticity and the flow is adjusted accordingly with each update, either automatically or manually depending on the particular system used. Oxygen in the flue gas is measured to determine gas density. An orifice flow meter is used to facilitate the adjustment of the sampling flow rate at oneminute intervals. The relevant parameters for flow calculation are entered into the computer. The computer is programmed to determine the flow rate through the orifice in order to achieve isokineticity. A dry gas meter is incorporated into the sampling train and is used to record the total actual volume sampled and therewith to determine the percentage isokineticity. Moisture is separated from the sampled gases during sampling, using a water trap and silica gel. The A indicator in the silica gel changes colour as moisture is absorbed. The accumulated liquid is used after the test to determine the moisture content on a percentage-by-volume basis. This value is again incorporated into the volume of dry gas sampled to determine the concentration of pollutants in the gases at Actual and Normal (sometimes referred to as Standard) conditions. The uncertainty before the test, about the moisture content in the gas, fluctuation in the gas flows and human error contribute towards the final deviation from 100 % isokineticity.

132 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 115 of 131 After completion of a measurement the relevant sampling components may be rinsed in order to capture pollutants that may have become attached to the sampling system s exposed surfaces. The rinse medium is captured and contaminants within will be added to the total sampled mass. Relevant plant operating parameters are logged, where possible, for reference purposes and it is usually recommended to take raw product samples during the tests. The content of certain elements in the raw product has specific bearing on plant performance and is useful for comparative reference. On completion of all the site measurements the equipment will be removed from the plant, returned to the laboratory and work shop for processing and cleaning. Where necessary, additional calibration checks will be conducted on specific instruments to determine operational continuity.

133 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 116 of 131 Appendix No. 6 Particulate Emission Monitor Calibration Conducted By Lethabo C & I

134 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 117 of 131 Unit No. 4

135 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 118 of 131 Unit No. 5

136 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 119 of 131 Unit No. 6

137 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 120 of 131 Appendix No. 7 Particle Size Analysis For Unit No. 4

138 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 121 of 131

139 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 122 of 131

140 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 123 of 131

141 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 124 of 131 Appendix No. 8 Filter Mass Sheets

142 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 125 of 131 Filter Mass Sheet Filters Label FQ Number 1 to 15 Reference Filters: E Filter Type & Size: 88R 30x100mm Initial Weighing Final Weighing Customer: Lafarge Customer: Lafarge % Moisture in Dust from Lab Result = % Plant: Lethabo U1/4 Plant: Lethabo U1/4 Unit: Lafa-Rand Separator and Mill Unit: Lafa-Rand Separator and Mill Correction from Reference Masses (%) = K Date: 2015/12/10 Date: 2016/03/30 Correction for Moisture in Filters (%) = K Start Time: 15H57 Start Time: 13H15 Correction from Blank Filter Mass(%) = K End time: 16h32 End time: 13H53 Correction for Moisture in Dust (%) = K Pressure (kpa): 81.7 Pressure (kpa): 82 Mass ofdust in Rinse (g) = RM From Rinse Sheet Temperature ( C): 21 Temperature ( C): 21 Weighed By: PH Pretorius Weighed By: SS Diutlwileng Reference Initials Average Finals Average Masses Initial Final 100g g Total initial mass = Total Final mass = Reference Initials Average K1 Finals Average Masses Initial g Final REF 1 E REF 2 E REF 3 E Total initial mass = Total Final mass = Preliminary *Final Dust Correction Correction Dust Comments Filter Initials Average K1 K2 K3 Finals Average Masses K4 K5 Masses Masses Initial g g g Final g g g g FQ Let U1 M1 FQ Let U1 M2 FQ Let U1 M3 FQ Let U1 M4 FQ Let U1 M5 FQ Let U1 M6 FQ Let U1 M7 FQ Let U1 M8 FQ Let U1 M9 FQ Let U1 M10 FQ Let U1 M11

143 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 126 of 131 Filter Mass Sheet Customer Lethabo U2 Initials Weighed by: Date: PH Pretorius 2015/12/10 Time Start & End: 14H54 15H30 Finals Weighed by: SS Diutlwileng Correction from Reference Masses (%) = K Date: 2016/01/12 Correction for Moisture in Filters (%) = K Time Start & End: 10H19 10H35 Correction from Blank Filter Mass(%) = K Filter Type 30x100mm Quartz Correction for Moisture in Dust (%) = K Correction for Dust in Rinse (g) = K5 Filter Initial Filter Preliminary *Final Identification Filter Corrections Correction & Dust Correction Correction Dust Comments Number Masses K1 K2 K3 Dust Masses K4 K5 Masses g g g g g g g g g FP Lethabo Unit No. 2 M1 FP Lethabo Unit No. 2 M2 FP Lethabo Unit No. 2 M3 FP Lethabo Unit No. 2 M4 FP Lethabo Unit No. 2 M5 FP Lethabo Unit No. 2 M6 FP Lethabo Unit No. 2 M7 FP Lethabo Unit No. 2 M8 FP Lethabo Unit No. 2 M10 FP Lethabo Unit No. 2 M11 FP Lethabo Unit No. 2 M12 FP Lethabo Unit No. 2 M13

144 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 127 of 131 Filter Mass Sheet Filters Label GA Number 1 to 15 Reference Filters: D Filter Type & Size: 88R 30x100mm Initial Weighing Final Weighing Customer: Eskom Customer: Eskom % Moisture in Dust from Lab Result = % Plant: Lethabo Unit 4 Plant: Lethabo Unit 4 Unit: No. 1 Unit: No. 1 Correction from Reference Masses (%) = K Date: 2016/02/29 Date: 2016/06/27 Correction for Moisture in Filters (%) = K Start Time: 15H33 Start Time: 12H12 Correction from Blank Filter Mass(%) = K End time: 16H10 End time: 12H49 Correction for Moisture in Dust (%) = K Pressure (kpa): 82 Pressure (kpa): 8.18 Mass ofdust in Rinse (g) = RM From Rinse Sheet Temperature ( C): 19 Temperature ( C): 19 Weighed By: SS Diutlwileng Weighed By: W J Bronkhorst Reference Initials Average Finals Average Masses Initial Final 100g g Total initial mass = Total Final mass = Reference Initials Average K1 Finals Average Masses Initial g Final REF 1 D REF 2 D REF 3 D Total initial mass = Total Final mass = Preliminary *Final Dust Correction Correction Dust Comments Filter Initials Average K1 K2 K3 Finals Average Masses K4 K5 Masses Masses Initial g g g Final g g g g GA Let U4 M1 GA Let U4 M2 GA Let U4 M3 GA Blank GA Let U4 M4 GA Let U4 M5 GA Let U4 M6 GA Let U4 M7 GA Let U4 M8 GA Let U4 M9 GA Let U4 M10 GA Let U4 M11 GA Let U4 M12

145 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 128 of 131 Filter Mass Sheet Customer lethabo U5 Initials Weighed by: Date: PH Pretorius 2015/12/10 Time Start & End: 16H57 15H30 Finals Weighed by: SS Diutlwileng Correction from Reference Masses (%) = K Date: 2015/01/08 Correction for Moisture in Filters (%) = K Time Start & End: 09H31 10H35 Correction from Blank Filter Mass(%) = K Filter Type 30x100mm Quartz Correction for Moisture in Dust (%) = K Correction for Dust in Rinse (g) = K5 Filter Initial Filter Preliminary *Final Identification Filter Corrections Correction & Dust Correction Correction Dust Comments Number Masses K1 K2 K3 Dust Masses K4 K5 Masses g g g g g g g g g FS Let Unit No. 5 M1 FS Let Unit No. 5 M2 FS Let Unit No. 5 M3 FS Let Unit No. 5 M4 FS Let Unit No. 5 M5 FS Let Unit No. 5 M6 FS Let Unit No. 5 M7 FS Let Unit No. 5 M8 FS Let Unit No. 5 M9 FS Let Unit No. 5 M10 FS Let Unit No. 5 M11 FS Let Unit No. 5 M12 FS Let Unit No. 5 M13 FS Let Unit No. 5 M14 FS Let Unit No. 5 M15

146 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 129 of 131 Filter Mass Sheet Customer Lethabo U6 Initials Weighed by: Date: PH Pretorius 2015/12/10 Time Start & End: 16H32 15H30 Finals Weighed by: SS Diutlwileng Correction from Reference Masses (%) = K Date: 2016/01/12 Correction for Moisture in Filters (%) = K Time Start & End: 09H14 10H35 Correction from Blank Filter Mass(%) = K Filter Type 30x100mm Quartz Correction for Moisture in Dust (%) = K Correction for Dust in Rinse (g) = K5 Filter Initial Filter Preliminary *Final Identification Filter Corrections Correction & Dust Correction Correction Dust Comments Number Masses K1 K2 K3 Dust Masses K4 K5 Masses g g g g g g g g g FR Lethabo Unit No. 6 M1 FR Lethabo Unit No. 6 M2 FR Lethabo Unit No. 6 M3 FR Lethabo Unit No. 6 M4 FR Lethabo Unit No. 6 M5 FR Lethabo Unit No. 6 M6 FR Lethabo Unit No. 6 M7 FR Lethabo Unit No. 6 M8 FR Lethabo Unit No. 6 M9 FR Lethabo Unit No. 6 M10 FR Lethabo Unit No. 6 M11 FR Lethabo Unit No. 6 M12 FR Lethabo Unit No. 6 M13 FR Lethabo Unit No. 6 M14 FR Lethabo Unit No. 6 M15

147 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 130 of 131 Appendix No. 9 Calibration Certificates

148 Lethabo Power Station Units No 1, 2, 4, 5 & 6 Emissions Dec 2015 to June 2016 Report No. RSL222 Page 131 of 131 List of Instrumentation Calibration Certificates