1 2 3 4 9 10 11 12 13

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 87 23 1.32E-06

7 60 83 23 1.13E-06

8 90 77 23 1.03E-06

9 180 66 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

lbs Hg/MMBtu

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

1.20E-06

0
14 15 16 17 18

0 1 2 3 4 5 6

UPL Values for Various Averaging 

Periods based on All Available Data

Hg/MMBtu

Days in Avgeraging Period

Hg/MMBtu

0 1 2 3 4 5 6

UPL Values for Various Averaging Periods based on 

the same data 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

2 6165_STK3 495 6,772 5.0E-09 116.9 5.0E-09 102 5.0E-09 84 76 65 5.0E-09 61 56 52 48 47

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

3 8069_Stk2 474 4,837 1.3E-08 82.7 1.3E-08 57 1.3E-08 48 43 40 1.3E-08 37 35 34 33

6 8069_Stk1 472 3,759 3.3E-08 40.4 3.3E-08 31 3.3E-08 29 24 21 3.3E-08

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

21 3_ESP (4A) Exit 377 3,090 1.4E-07 36.3 1.4E-07 23 1.4E-07 18 16 1.4E-07

19 1552_Stack 1 204 4,833 9.5E-08 33.4 9.5E-08 24 9.5E-08 20 17 16 9.5E-08 16 14

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

4 2451_Unit 2 Stack 377 3,615 2.8E-08 27.0 2.8E-08 22 2.8E-08 19 17 16 2.8E-08

10 2451_Unit 3 Stack 546 7,127 5.0E-08 26.8 5.0E-08 23 5.0E-08 20 18 17 5.0E-08 16 15 14 14 13

23 6257_Stack 3 909 7,487 2.0E-07 23.6 2.0E-07 19 2.0E-07 17 15 13 2.0E-07 12 11 11 10 9

20 1552_Stack 2 208 4,222 9.2E-08 22.7 9.2E-08 14 9.2E-08 12 13 12 9.2E-08 11

22 4162_STK 3 356 2,267 1.1E-07 21.9 1.1E-07 20 1.1E-07 17 1.1E-07

49 6193_Stack 2 373 7,240 1.2E-06 19.9 1.2E-06 12 1.2E-06 9 8 7 1.2E-06 6 6 6 5 5

15 703_Scrubber Stack (2) 773 4,522 9.3E-08 17.9 9.3E-08 15 9.3E-08 12 11 10 9.3E-08 9 8

18 4162_STK 1 174 3,791 9.0E-08 14.8 9.0E-08 14 9.0E-08 13 11 11 9.0E-08

13 3644_Stck 2 113 4,873 7.7E-08 14.1 7.7E-08 13 7.7E-08 13 11 10 7.7E-08 10 9

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

26 3406_SK001 1,098 2,509 1.9E-07 13.4 1.9E-07 11 1.9E-07 8 8 1.9E-07

14 1554_Stack 2 139 6,226 1.0E-07 11.6 1.0E-07 10 1.0E-07 8 7 6 1.0E-07 6 6 6

33 6194_2St 570 5,733 7.8E-07 11.4 7.8E-07 10 7.8E-07 10 9 8 7.8E-07 7 7 6

12 2451_Unit 1 Stack 377 4,159 7.3E-08 11.1 7.3E-08 10 7.3E-08 10 10 9 7.3E-08 9 9

24 1378_SK001 662 2,021 1.7E-07 10.8 1.7E-07 7 1.7E-07 6 1.7E-07

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

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

7 3396_SK001 906 2,259 3.7E-08 7.6 3.7E-08 6 3.7E-08 6 3.7E-08

16 3644_Stck 1 75 4,745 9.0E-08 7.0 9.0E-08 6 9.0E-08 6 6 6 9.0E-08 6 6

32 6193_Stack 3 380 1,884 8.9E-07 6.8 8.9E-07 6 8.9E-07 8.9E-07

41 3845_FGDSSTACK2 726 4,961 8.0E-07 6.0 8.0E-07 6 8.0E-07 5 5 5 8.0E-07 5 5

5 6076_1STACK 352 6,770 6.8E-07 5.9 6.8E-07 6 6.8E-07 5 5 5 6.8E-07 5 5 5 5

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

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

17 1378_SK003 1,089 925 1.1E-07 4.9 1.1E-07 1.1E-07 1.1E-07

37 3403_SK002 556 5,427 7.2E-07 4.7 7.2E-07 4 7.2E-07 4 4 4 7.2E-07 4 4 4

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

29 47_SK001 736 2,002 2.7E-07 4.6 2.7E-07 4 2.7E-07 4 2.7E-07

34 1570_9B 28 709 5.4E-07 4.5 5.4E-07 4 5.4E-07 5.4E-07

52 4158_STK43 246 5,562 1.6E-06 4.3 1.6E-06 4 1.6E-06 4 4 4 1.6E-06 4 3 3

30 703_Scrubber Stack (3) 949 6,354 3.4E-07 4.3 3.4E-07 4 3.4E-07 4 3 3 3.4E-07 3 3 3 3

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
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

38 26_FGD Stack 5 905 5,700 9.5E-07 4.1 9.5E-07 4 9.5E-07 4 4 3 9.5E-07 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

46 4158_STK41 113 5,698 1.0E-06 4.0 1.0E-06 4 1.0E-06 3 3 3 1.0E-06 3 3 3

87 26_Shared Stack 3 4 540 5,108 1.5E-05 4.0 1.5E-05 3 1.5E-05 2 2 2 1.5E-05 2 2

80 10_Shared Stack 1 2 534 7,267 6.8E-06 3.7 6.8E-06 4 6.8E-06 3 3 3 6.8E-06 3 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

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

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

51 4050_ESP Outlet 4 307 6,518 1.3E-06 3.4 1.3E-06 3 1.3E-06 3 3 3 1.3E-06 3 3 2 2 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

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

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

31 4162_STK 2 231 3,558 7.1E-07 3.1 7.1E-07 3 7.1E-07 2 2 2 7.1E-07

25 6165_STK2 461 6,305 6.8E-07 3.0 6.8E-07 3 6.8E-07 3 3 3 6.8E-07 3 2 2 2

64 1048_Unit 2 Stack 224 6,245 4.7E-06 3.0 4.7E-06 3 4.7E-06 2 2 1 4.7E-06 1 1 1 1 1

48 1570_9A 28 803 8.4E-07 2.9 8.4E-07 3 8.4E-07 8.4E-07

62 8066_STK4 577 6,935 1.9E-06 2.8 1.9E-06 3 1.9E-06 3 2 2 1.9E-06 2 2 2 2 2

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

65 6076_4STACK 819 2,579 2.0E-06 2.7 2.0E-06 2 2.0E-06 2 2.0E-06

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

56 3845_FGDSSTACK1 732 4,219 1.6E-06 2.6 1.6E-06 2 1.6E-06 2 2 2 1.6E-06 2

55 4158_STK42 115 5,727 1.4E-06 2.4 1.4E-06 2 1.4E-06 2 2 2 1.4E-06 2 2 2

72 6194_1St 565 6,128 2.9E-06 2.4 2.9E-06 2 2.9E-06 2 2 2 2.9E-06 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

60 3_FGD Stack 5 773 2,025 2.0E-06 2.3 2.0E-06 2 2.0E-06 2.0E-06

58 4158_STK44 368 1,675 2.5E-06 2.2 2.5E-06 2 2.5E-06 2.5E-06

36 3399_SK001 1,309 1,436 5.7E-07 2.1 5.7E-07 2 5.7E-07 5.7E-07

44 6076_2STACK 338 8,144 1.6E-06 2.1 1.6E-06 2 1.6E-06 2 2 2 1.6E-06 2 2 2 2 2

74 8066_STK1 570 6,419 3.0E-06 2.1 3.0E-06 2 3.0E-06 2 2 2 3.0E-06 2 2 2 2

54 6076_3STACK 812 6,974 2.7E-06 2.1 2.7E-06 2 2.7E-06 2 2 2 2.7E-06 2 2 2 2 2

69 8066_STK3 570 6,749 2.4E-06 2.0 2.4E-06 2 2.4E-06 2 2 2 2.4E-06 2 2 2 2 2

84 8_Shared Stack 6 7 215 751 1.0E-05 2.0 1.0E-05 1.0E-05 1.0E-05

27 3403_SK001 489 8,048 3.1E-06 1.9 3.1E-06 2 3.1E-06 2 2 2 3.1E-06 2 2 2 2 2

67 8066_STK2 571 6,779 2.6E-06 1.9 2.6E-06 2 2.6E-06 2 2 2 2.6E-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

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

76 709_Shared Stack 3 4 1,027 7,794 4.3E-06 1.8 4.3E-06 2 4.3E-06 2 2 2 4.3E-06 2 2 2 2 2

77 1104_Stack - 1 216 7,021 4.1E-06 1.7 4.1E-06 2 4.1E-06 2 2 2 4.1E-06 2 2 2 2 2

42 2187_Stack1 166 7,451 3.7E-06 1.7 3.7E-06 2 3.7E-06 2 2 2 3.7E-06 2 2 2 2 2

81 8023_Unit 2 Stack 596 6,835 5.4E-06 1.7 5.4E-06 2 5.4E-06 2 2 2 5.4E-06 2 2 2 2 2
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

82 1047_Unit 4 Stack 261 6,228 6.5E-06 1.6 6.5E-06 2 6.5E-06 1 1 1 6.5E-06 1 1 1 1

83 8023_Unit 1 Stack 595 6,979 6.5E-06 1.6 6.5E-06 2 6.5E-06 2 1 1 6.5E-06 1 1 1 1 1

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

79 6254_Stack-1 771 7,021 5.0E-06 1.6 5.0E-06 2 5.0E-06 2 1 1 5.0E-06 1 1 1 1 1

47 50_SK003 473 769 8.1E-07 1.4 8.1E-07 8.1E-07 8.1E-07

85 3178_Stack_2 189 1,717 1.2E-05 1.0 1.2E-05 1 1.2E-05 1 1 1 1.2E-05 1

40 50_SK001 344 779 6.2E-07 0.7 6.2E-07 6.2E-07 6.2E-07

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

5.0E-09 5.8E-07

46 8.2E-09 45 9.3E-07

1.3E-08 1.1E-06

3.3E-08 1.3E-06

8 3.5E-08 8 4.8E-07

1.4E-07 5.0E-06

9.5E-08 3.2E-06

19 5.1E-08 19 1.5E-06

2.8E-08 7.4E-07

5.0E-08 1.3E-06

9 2.0E-07 4.6E-06

9.2E-08 2.1E-06

1.1E-07 2.5E-06

1.2E-06 2.5E-05

9.3E-08 1.7E-06

9.0E-08 1.3E-06

7.7E-08 1.1E-06

24 5.1E-08 23 2.0E-06

1.9E-07 2.6E-06

1.0E-07 1.2E-06

7.8E-07 8.9E-06

7.3E-08 8.2E-07

1.7E-07 1.8E-06

4 3.3E-07 4 1.8E-06

6 6.3E-07 6 5.0E-06

3.7E-08 2.8E-07

9.0E-08 6.3E-07

8.9E-07

8.0E-07 4.8E-06

6.8E-07 4.0E-06

3 6.4E-07 3 2.6E-06

3 9.1E-07 3 3.7E-06

1.1E-07 5.3E-07

7.2E-07 3.4E-06

2 1.5E-06 2 4.0E-06

2.7E-07 1.3E-06

5.4E-07 2.5E-06

1.6E-06

3.4E-07 1.5E-06

4 1.5E-06 4
Max. 330 

Day Avg/ 

Min Surr. 

Stk Test

Max. 360 

Day Avg/ 

Min Surr. 

Stk Test

Max

9.5E-07 3.9E-06

3 1.6E-06 3

1.0E-06 4.1E-06

1.5E-05

6.8E-06

3 1.6E-06 3

3 1.9E-06 3 1.6E-05

3 2.0E-06 3

1.3E-06 4.4E-06

2 2.1E-06 2

2 2.3E-06 2 1.3E-05

1 2.3E-06 1 6.4E-06

7.1E-07 2.2E-06

6.8E-07 2.0E-06

4.7E-06

8.4E-07 2.4E-06

1.9E-06 5.5E-06

3 2.4E-06 3

2.0E-06

1 2.6E-06 1

1.6E-06 4.0E-06

1.4E-06 3.3E-06

2.9E-06

2 2.9E-06 2

2.0E-06

2.5E-06

5.7E-07 1.2E-06

2 1.6E-06 3.3E-06

3.0E-06

2.7E-06

2.4E-06

1.0E-05

2 3.1E-06

2.6E-06

2 4.0E-06 1

2 6.4E-06 2

2 4.3E-06

2 4.1E-06

3.7E-06

2 5.4E-06
Max. 330 

Day Avg/ 

Min Surr. 

Stk Test

Max. 360 

Day Avg/ 

Min Surr. 

Stk Test

Max

6.5E-06

1 6.5E-06

1 1.4E-05 1

1 5.0E-06

8.1E-07 1.2E-06

1.2E-05

6.2E-07 4.4E-07

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-1: 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 = 0.0032x-0.521

R2 = 0.7323

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

2.4864E-07 2.4864E-07 3.2782E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

3.2782E-07 3.4864E-07 3.4864E-07 3.7903E-07
Seward AES Greenidge

3130 2527 2 6

3.7903E-07 3.8217E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

4.0424E-07 4.2705E-07 4.3680E-07
Northampton Generating 

Company, L.P.

50888

BLR1

4.8000E-07
y = 0.0033x-0.514

R2 = 0.8031

60 

80 

100 

120 

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 84 Units

6hr Surrogate: 3rd Percentile (0.03)

60 Day Rolling Avg: 99th Percentile (0.99)

UPL = 1.01 E-06 lbs Hg/MMBtu

R2 = 0.8031

0 

20 

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

2.2330E-07 2.2330E-07 2.9560E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

2.9560E-07 3.1466E-07 3.1466E-07 3.4250E-07
Seward AES Greenidge

3130 2527 2 6

3.4250E-07 3.4538E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

3.6562E-07 3.8656E-07 3.9552E-07
Northampton Generating 

Company, L.P.

50888

BLR1

4.3524E-07
y = 0.0039x-0.498 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 77 Units

6hr Surrogate: 3rd Percentile (0.03)

90 Day Rolling Avg: 99th Percentile (0.99)

UPL = 0.91 E-06 lbs Hg/MMBtu

y = 0.0039x

R2 = 0.8311

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

1.9238E-07 1.9238E-07 2.5704E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

2.5704E-07 2.7417E-07 2.7417E-07 2.9927E-07
Seward AES Greenidge

3130 2527 2 6

2.9927E-07 3.0186E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

3.2015E-07 3.3912E-07 3.4723E-07
Northampton Generating 

Company, L.P.

50888

BLR1

3.8331E-07
y = 0.004x-0.489 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 66 Units

6hr Surrogate: 3rd Percentile (0.03)

180 Day Rolling Avg: 99th Percentile (0.99)

UPL = 0.91 E-06 lbs Hg/MMBtu

y = 0.004x-0.489

R2 = 0.8624

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

1.6517E-07 1.6517E-07 2.2183E-07
Spruance Genco, LLC Logan Generating Plant Nucla Seward

54081 10043 527 3130

3B B01 1 1

2.2183E-07 2.3690E-07 2.3690E-07 2.5899E-07
Seward AES Greenidge

3130 2527 2 6

2.5899E-07 2.6127E-07
Roanoke Valley I AES Westover, LLC

INDIANTOWN 

COGENERATIO

N L.P.

54035 2526 50976

BLR1 13 AABO1

2.7740E-07 2.9413E-07 3.0130E-07
Northampton Generating 

Company, L.P.

50888

BLR1

3.3319E-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
60 

80 

100 

120 

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 

20 

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)