1 2 3 4 9 10 11 12

Available Used UPL

Run ID Avg Period Data Sets Data Sets lb Hg /MMBtu

1 30 87 87 1.11E-06

2 60 83 83 1.01E-06

3 90 77 77 9.13E-07

4 180 66 66 8.04E-07

5 360 23 23 7.60E-07

6 30 23 23 1.32E-06

7 60 23 23 1.13E-06

8 90 23 23 1.03E-06

9 180 23 23 9.17E-07

10 360 23 23 7.60E-07

0.00E+00

2.00E-07

4.00E-07

6.00E-07

8.00E-07

1.00E-06

1.20E-06

1.40E-06

0 1 2

UPL Values for Various Averaging 

Periods based on All Available Dat

lbs Hg/MMBtu

6.00E-07

8.00E-07

1.00E-06

1.20E-06

1.40E-06

1.60E-06

lbs Hg/MMBtu

0.00E+00

2.00E-07

4.00E-07

6.00E-07

8.00E-07

1.00E-06

0 1 2

UPL Values for Various Averaging P

the same data set of 23 units.
13 14 15 16 17 18

3 4 5 6

s for Various Averaging 

sed on All Available Data

Days in Avgeraging Period

3 4 5 6

 for Various Averaging Periods based on 

ata set of 23 units.

Days in Avgeraging Period
a = run 

sequence

fac_stack Max_MW

CEMS Hr 

Count for 

Unit

Minimum 

Surr. Stk 

Test

Max. 30 

Day Avg/ 

Min Surr. 

Stk Test

Max. 60 

Day Avg/ 

Min Surr. 

Stk Test

Max. 90 

Day Avg/ 

Min Surr. 

Stk Test

Max. 120 

Day Avg/ 

Min Surr. 

Stk Test

Max. 150 

Day Avg/ 

Min Surr. 

Stk Test

Max. 180 

Day Avg/ 

Min Surr. 

Stk Test

Max. 210 

Day Avg/ 

Min Surr. 

Stk Test

Max. 240 

Day Avg/ 

Min Surr. 

Stk Test

Max. 270 

Day Avg/ 

Min Surr. 

Stk Test

Max. 300 

Day Avg/ 

Min Surr. 

Stk Test

1 130_C1 643 25,439 8.2E-09 114.4 8.2E-09 93 8.2E-09 78 68 62 8.2E-09 59 56 54 51 48

9 56224_STK1 241 11,691 5.1E-08 38.4 5.1E-08 34 5.1E-08 32 30 28 5.1E-08 28 27 26 25 24

11 130_C2 621 25,742 5.1E-08 29.2 5.1E-08 26 5.1E-08 25 24 24 5.1E-08 22 22 21 20 20

8 2451_Unit 4 Stack 548 8,697 3.5E-08 13.7 3.5E-08 12 3.5E-08 10 10 10 3.5E-08 9 8 8 9 9

39 4041_OCPP-S13 529 9,481 6.3E-07 8.0 6.3E-07 7 6.3E-07 7 7 7 6.3E-07 6 6 6 6 6

28 6165_STK1 460 8,273 3.3E-07 5.5 3.3E-07 5 3.3E-07 5 4 4 3.3E-07 4 4 4 4 4

53 4050_Stack - 5 429 7,313 1.5E-06 4.7 1.5E-06 4 1.5E-06 4 4 4 1.5E-06 4 4 4 4 4

61 6101_STK1 387 8,740 1.9E-06 8.2 1.9E-06 6 1.9E-06 5 4 4 1.9E-06 4 4 4 4 4

45 6170_PPPPS2 650 9,504 9.1E-07 4.0 9.1E-07 4 9.1E-07 4 4 4 9.1E-07 4 4 4 4 3

35 1606_STK1 159 13,401 6.4E-07 4.1 6.4E-07 4 6.4E-07 4 4 4 6.4E-07 4 3 3 3 3

43 1554_Stack 3 319 8,760 1.6E-06 3.5 1.6E-06 3 1.6E-06 3 3 3 1.6E-06 3 3 3 3 3

63 6002_Stack 2 730 9,040 2.0E-06 3.4 2.0E-06 3 2.0E-06 3 3 3 2.0E-06 3 3 3 3 3

71 3_Shared Stack 1 2 3 548 8,728 2.4E-06 3.2 2.4E-06 3 2.4E-06 3 3 3 2.4E-06 3 3 3 3 3

50 6170_PPPPS1 651 9,504 1.6E-06 3.5 1.6E-06 3 1.6E-06 3 3 3 1.6E-06 3 3 3 3 3

68 3181_Stack 4 307 10,945 2.3E-06 5.7 2.3E-06 4 2.3E-06 3 3 3 2.3E-06 3 3 3 3 2

59 6002_Stack 4 725 8,265 2.1E-06 3.2 2.1E-06 3 2.1E-06 3 3 3 2.1E-06 2 2 2 2 2

57 6761_S101 308 8,111 1.5E-06 2.6 1.5E-06 2 1.5E-06 2 2 2 1.5E-06 2 2 2 2 2

78 26_Shared Stack 1 2 543 12,081 6.4E-06 3.3 6.4E-06 3 6.4E-06 3 3 2 6.4E-06 2 2 2 2 2

70 6002_Stack 3 726 8,919 2.9E-06 2.3 2.9E-06 2 2.9E-06 2 2 2 2.9E-06 2 2 2 2 2

75 6002_Stack 1 720 9,096 4.0E-06 1.8 4.0E-06 2 4.0E-06 2 2 2 4.0E-06 2 2 2 2 2

86 7_Shared Stack 1 2 106 9,427 1.4E-05 1.9 1.4E-05 2 1.4E-05 2 2 2 1.4E-05 1 1 1 1 1

66 8_Shared Stack 8 9 10 1,078 8,393 2.3E-06 2.7 2.3E-06 2 2.3E-06 1 1 1 2.3E-06 1 1 1 1 1

73 4054_U1U2 CS Stack 232 7,588 2.6E-06 1.6 2.6E-06 1 2.6E-06 1 1 1 2.6E-06 1 1 1 1 1

2 6165_STK3 495 6,772

3 8069_Stk2 474 4,837

6 8069_Stk1 472 3,759

21 3_ESP (4A) Exit 377 3,090

19 1552_Stack 1 204 4,833

4 2451_Unit 2 Stack 377 3,615

10 2451_Unit 3 Stack 546 7,127

23 6257_Stack 3 909 7,487

20 1552_Stack 2 208 4,222

22 4162_STK 3 356 2,267

49 6193_Stack 2 373 7,240

15 703_Scrubber Stack (2) 773 4,522

18 4162_STK 1 174 3,791

13 3644_Stck 2 113 4,873

26 3406_SK001 1,098 2,509

14 1554_Stack 2 139 6,226

33 6194_2St 570 5,733
a = run 

sequence

fac_stack Max_MW

CEMS Hr 

Count for 

Unit

Minimum 

Surr. Stk 

Test

Max. 30 

Day Avg/ 

Min Surr. 

Stk Test

Max. 60 

Day Avg/ 

Min Surr. 

Stk Test

Max. 90 

Day Avg/ 

Min Surr. 

Stk Test

Max. 120 

Day Avg/ 

Min Surr. 

Stk Test

Max. 150 

Day Avg/ 

Min Surr. 

Stk Test

Max. 180 

Day Avg/ 

Min Surr. 

Stk Test

Max. 210 

Day Avg/ 

Min Surr. 

Stk Test

Max. 240 

Day Avg/ 

Min Surr. 

Stk Test

Max. 270 

Day Avg/ 

Min Surr. 

Stk Test

Max. 300 

Day Avg/ 

Min Surr. 

Stk Test

12 2451_Unit 1 Stack 377 4,159

24 1378_SK001 662 2,021

7 3396_SK001 906 2,259

16 3644_Stck 1 75 4,745

32 6193_Stack 3 380 1,884

41 3845_FGDSSTACK2 726 4,961

5 6076_1STACK 352 6,770

17 1378_SK003 1,089 925

37 3403_SK002 556 5,427

29 47_SK001 736 2,002

34 1570_9B 28 709

52 4158_STK43 246 5,562

30 703_Scrubber Stack (3) 949 6,354

38 26_FGD Stack 5 905 5,700

46 4158_STK41 113 5,698

87 26_Shared Stack 3 4 540 5,108

80 10_Shared Stack 1 2 534 7,267

51 4050_ESP Outlet 4 307 6,518

31 4162_STK 2 231 3,558

25 6165_STK2 461 6,305

64 1048_Unit 2 Stack 224 6,245

48 1570_9A 28 803

62 8066_STK4 577 6,935

65 6076_4STACK 819 2,579

56 3845_FGDSSTACK1 732 4,219

55 4158_STK42 115 5,727

72 6194_1St 565 6,128

60 3_FGD Stack 5 773 2,025

58 4158_STK44 368 1,675

36 3399_SK001 1,309 1,436

44 6076_2STACK 338 8,144

74 8066_STK1 570 6,419

54 6076_3STACK 812 6,974

69 8066_STK3 570 6,749

84 8_Shared Stack 6 7 215 751

27 3403_SK001 489 8,048

67 8066_STK2 571 6,779

76 709_Shared Stack 3 4 1,027 7,794

77 1104_Stack - 1 216 7,021

42 2187_Stack1 166 7,451
a = run 

sequence

fac_stack Max_MW

CEMS Hr 

Count for 

Unit

Minimum 

Surr. Stk 

Test

Max. 30 

Day Avg/ 

Min Surr. 

Stk Test

Max. 60 

Day Avg/ 

Min Surr. 

Stk Test

Max. 90 

Day Avg/ 

Min Surr. 

Stk Test

Max. 120 

Day Avg/ 

Min Surr. 

Stk Test

Max. 150 

Day Avg/ 

Min Surr. 

Stk Test

Max. 180 

Day Avg/ 

Min Surr. 

Stk Test

Max. 210 

Day Avg/ 

Min Surr. 

Stk Test

Max. 240 

Day Avg/ 

Min Surr. 

Stk Test

Max. 270 

Day Avg/ 

Min Surr. 

Stk Test

Max. 300 

Day Avg/ 

Min Surr. 

Stk Test

81 8023_Unit 2 Stack 596 6,835

82 1047_Unit 4 Stack 261 6,228

83 8023_Unit 1 Stack 595 6,979

79 6254_Stack-1 771 7,021

47 50_SK003 473 769

85 3178_Stack_2 189 1,717

40 50_SK001 344 779

1 2 3 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Max. 330 

Day Avg/ 

Min Surr. 

Stk Test

Max. 360 

Day Avg/ 

Min Surr. 

Stk Test

Max

46 8.2E-09 45 9.3E-07

24 5.1E-08 23 2.0E-06

19 5.1E-08 19 1.5E-06

8 3.5E-08 8 4.8E-07

6 6.3E-07 6 5.0E-06

4 3.3E-07 4 1.8E-06

4 1.5E-06 4

3 1.9E-06 3 1.6E-05

3 9.1E-07 3 3.7E-06

3 6.4E-07 3 2.6E-06

3 1.6E-06 3

3 2.0E-06 3

3 2.4E-06 3

3 1.6E-06 3

2 2.3E-06 2 1.3E-05

2 2.1E-06 2

2 1.5E-06 2 4.0E-06

2 6.4E-06 2

2 2.9E-06 2

2 4.0E-06 1

1 1.4E-05 1

1 2.3E-06 1 6.4E-06

1 2.6E-06 1
Max. 330 

Day Avg/ 

Min Surr. 

Stk Test

Max. 360 

Day Avg/ 

Min Surr. 

Stk Test

Max
Max. 330 

Day Avg/ 

Min Surr. 

Stk Test

Max. 360 

Day Avg/ 

Min Surr. 

Stk Test

Max

21 22 23 24 25 26 27 28 29 30 31
60.0 

80.0 

100.0 

120.0 

140.0 

y= (30 Day Rolling Avg)/(6hr CEMS Surrogate for Stack Test)

Figure A-2: Relationship Between Minimum Single Point Stack Tests and 30 Day Rolling Averages Based on Hg CEMS Data for 23 

6hr Surrogate: 3rd Percentile (0.03)

30 Day Rolling Avg: 99th Percentile (0.99)

UPL = 1.32 E-06 lbs Hg/MMBtu

Control Data Set - Same 23 Units Used in 360 Day Average Analysis 

y = 0.0034x-0.528

R2 = 0.8326

0.0 

20.0 

40.0 

60.0 

0.0E+00 2.0E-06 4.0E-06 6.0E-06 8.0E-06 1.0E-05 1.2E-05 1.4E-05 1.6E-05

x= Surrogate Stack 

Test (lbs Hg/MMBtu)
Spruance Genco, LLC Spruance Genco, LLC Spruance Genco, LLC

54081 54081 54081

2B 2A 3A

3.0336E-07 3.0336E-07 3.9836E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

3.9836E-07 4.2327E-07 4.2327E-07 4.5961E-07
Seward AES Greenidge

3130 2527 2 6

4.5961E-07 4.6336E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

4.8971E-07 5.1693E-07 5.2855E-07
Northampton Generating 

Company, L.P.

50888

BLR1

5.8003E-07
y = 0.003x-0.526

R2 = 0.845

50 

60 

70 

80 

90 

100 

y= (60 Day Rolling Avg)/(6hr CEMS Surrogate for Stack Test)

The Relationship Between Minimum Single Point Stack Tests and 60 Day Rolling Averages Based on Hg CEMS Data for 23 Units

6hr Surrogate: 3rd Percentile (0.03)

60 Day Rolling Avg: 99th Percentile (0.99)

UPL = 1.01 E-06 lbs Hg/MMBtu

R2 = 0.845

0 

10 

20 

30 

40 

0.0E+00 2.0E-06 4.0E-06 6.0E-06 8.0E-06 1.0E-05 1.2E-05 1.4E-05 1.6E-05

x= Surrogate Stack 

Test (lbs Hg/MMBtu)
Spruance Genco, LLC Spruance Genco, LLC Spruance Genco, LLC

54081 54081 54081

2B 2A 3A

2.5730E-07 2.5730E-07 3.3827E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

3.3827E-07 3.5952E-07 3.5952E-07 3.9051E-07
Seward AES Greenidge

3130 2527 2 6

3.9051E-07 3.9371E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

4.1620E-07 4.3944E-07 4.4936E-07
Northampton Generating 

Company, L.P.

50888

BLR1

4.9332E-07
40 

50 

60 

70 

80 

90 

y= (90 Day Rolling Avg)/(6hr CEMS Surrogate for Stack Test)

The Relationship Between Minimum Single Point Stack Tests and 90 Day Rolling Averages Based on Hg CEMS Data for 23 Units

6hr Surrogate: 3rd Percentile (0.03)

90 Day Rolling Avg: 99th Percentile (0.99)

UPL = 0.91 E-06 lbs Hg/MMBtu

y = 0.0033x-0.515

R2 = 0.8444

0 

10 

20 

30 

0.0E+00 2.0E-06 4.0E-06 6.0E-06 8.0E-06 1.0E-05 1.2E-05 1.4E-05 1.6E-05

x= Surrogate Stack 

Test (lbs Hg/MMBtu)
Spruance Genco, LLC Spruance Genco, LLC Spruance Genco, LLC

54081 54081 54081

2B 2A 3A

2.2775E-07 2.2775E-07 3.0132E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

3.0132E-07 3.2071E-07 3.2071E-07 3.4903E-07
Seward AES Greenidge

3130 2527 2 6

3.4903E-07 3.5195E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

3.7253E-07 3.9383E-07 4.0293E-07
Northampton Generating 

Company, L.P.

50888

BLR1

4.4331E-07
30 

40 

50 

60 

70 

y= (180 Day Rolling Avg)/(6hr CEMS Surrogate for Stack 

Test)

The Relationship Between Minimum Single Point Stack Tests and 180 Day Rolling Averages Based on Hg CEMS Data for 23 Units

6hr Surrogate: 3rd Percentile (0.03)

180 Day Rolling Avg: 99th Percentile (0.99)

UPL = 0.91 E-06 lbs Hg/MMBtu

y = 0.0036x-0.503

R2 = 0.8572

0 

10 

20 

0.0E+00 2.0E-06 4.0E-06 6.0E-06 8.0E-06 1.0E-05 1.2E-05 1.4E-05 1.6E-05

x= Surrogate Stack 

Test (lbs Hg/MMBtu)
Spruance Genco, LLC Spruance Genco, LLC Spruance Genco, LLC

54081 54081 54081

2B 2A 3A

1.9602E-07 1.9602E-07 2.6114E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

2.6114E-07 2.7837E-07 2.7837E-07 3.0359E-07
Seward AES Greenidge

3130 2527 2 6

3.0359E-07 3.0619E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

3.2455E-07 3.4358E-07 3.5172E-07
Northampton Generating 

Company, L.P.

50888

BLR1

3.8788E-07
25 

30 

35 

40 

45 

50 

y= (360 Day Rolling Avg)/(6hr CEMS Surrogate for Stack 

Test)

The Relationship Between Minimum Single Point Stack Tests and 360 Day Rolling Averages Based on Hg CEMS Data for 23 Units

6hr Surrogate: 3rd Percentile (0.03)

360 Day Rolling Avg: 99th Percentile (0.99)

UPL = 0.76 E-06 lbs Hg/MMBtu

y = 0.0044x-0.48

R2 = 0.8607

0 

5 

10 

15 

20 

0.0E+00 2.0E-06 4.0E-06 6.0E-06 8.0E-06 1.0E-05 1.2E-05 1.4E-05 1.6E-05

x= Surrogate Stack 

Test (lbs Hg/MMBtu)
Spruance Genco, LLC Spruance Genco, LLC Spruance Genco, LLC

54081 54081 54081

2B 2A 3A

1.5210E-07 1.5210E-07 2.0533E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

2.0533E-07 2.1953E-07 2.1953E-07 2.4038E-07
Seward AES Greenidge

3130 2527 2 6

2.4038E-07 2.4254E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

2.5778E-07 2.7361E-07 2.8039E-07
Northampton Generating 

Company, L.P.

50888

BLR1

3.1063E-07
Spruance Genco, LLC Spruance Genco, LLC Spruance Genco, LLC

54081 54081 54081

2B 2A 3A

2.6333E-09 2.6333E-09 4.6900E-09
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

4.6900E-09 5.3333E-09 5.3333E-09 6.3500E-09

9.8533E-09 5.5333E-08

6.0000E-09 3.8000E-08
Seward AES Greenidge

3130 2527 2 6

6.3500E-09 6.4602E-09

5.5333E-08 7.6771E-08

3.8000E-08
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

7.2633E-09 8.1456E-09 8.5384E-09

5.4900E-07
Northampton Generating 

Company, L.P.

50888

BLR1

1.0397E-08

1.2872E-07
50 

60 

70 

80 

90 

100 

y= (30 Day Rolling Avg)/(6hr CEMS Surrogate for Stack Test)

The Relationship Between Minimum Single Point Stack Tests and 30 Day Rolling Averages Based on Hg CEMS Data for 87 Units

6hr Surrogate: 3rd Percentile (0.03)

30 Day Rolling Avg: 99th Percentile (0.99)

UPL = 1.1 E-06 lbs Hg/MMBtu

y = 0.0033x-0.514

R2 = 0.8031

0 

10 

20 

30 

40 

0.0E+00 2.0E-06 4.0E-06 6.0E-06 8.0E-06 1.0E-05 1.2E-05 1.4E-05 1.6E-05

x= Surrogate Stack 

Test (lbs Hg/MMBtu)