## Coversheet:

**Tab Tab Description**  Table 6-5 (1) This table presents a summary of the key environmental improvements

associated with Options 1, 2, 3, 4, and 5 in immediate receiving waters evaluated in the Environmental Assessment (EA). Table 6-5 (2) This table presents a summary of the key environmental improvements

associated with Options 3a, 3b, and 4a in immediate receiving waters evaluated in the EA. Table 6-15 (1) This table presents a summary of the key environmental improvements

associated with Options 1, 2, 3, 4, and 5 in downstream receiving waters evaluated in the EA. Table 6-15 (2) This table presents a summary of the key environmental improvements

associated with Options 3a, 3b, and 4a in downstream receiving waters evaluated in the EA. WQ Calcs This tab contains summary tables generated from the Water Quality Model

Summary Tables Database (DCN SE03505) used to calculate water quality improvements presented in Table 6-5. WL Calcs This tab contains summary tables generated from the Wildlife Model Summary

Tables Database (DCN SE03528) used to calculate wildlife improvements presented in Table 6-5. Non-Cancer CalcsThis tab contains summary tables generated from the Human Health Model

Summary Tables Database (DCN SE03529) used to calculate human health improvements (non-cancer) presented in Table 6-5. Cancer Calcs This tab contains summary tables generated from the Human Health Model

Summary Tables Database (DCN SE03529) used to calculate cancer human health improvements (cancer) presented in Table 6-5. This spreadsheet summarizes the key environmental improvements estimated using the water quality model, wildlife model, and human health model for baseline and the regulatory options under the current profile. These results are presented in Section 6 (Environmental Improvements under the Proposed Regulatory Options) of the Final Environmental Assessment for the Proposed Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category Report (DCN SE01995).**Table 6-5. Key Environmental Improvements Under the Evaluated Regulatory Options**

**No. %**  Freshwater Acute NRWQC 31 10% 24 (23%) 24 (23%) 20 (35%) 5 (84%) 5 (84%) Freshwater Chronic NRWQC 67 23% 62 (7%) 56 (16%) 54 (19%) 16 (76%) 16 (76%) Human Health Water and Organism NRWQC 147 49% 147 (0%) 147 (0%) 120 (18%) 48 (67%) 50 (66%) Human Health Organism Only NRWQC 99 33% 99 (0%) 99 (0%) 85 (14%) 28 (72%) 24 (76%) Drinking Water MCL 59 20% 58 (2%) 54 (8%) 51 (14%) 5 (92%) 5 (92%) Fish Ingestion NEHC for Mink 99 33% 91 (8%) 83 (16%) 69 (30%) 15 (85%) 15 (85%) Fish Ingestion NEHC for Eagles 129 43% 118 (9%) 110 (15%) 97 (25%) 17 (87%) 17 (87%) Non-Cancer Reference Dose for Child (recreational) 124 42% 109 (12%) 106 (15%) 92 (26%) 12 (90%) 10 (92%) Non-Cancer Reference Dose for Adult (recreational) 128 43% 114 (11%) 109 (15%) 96 (25%) 12 (91%) 10 (92%) Non-Cancer Reference Dose for Child (subsistence) 196 66% 179 (9%) 173 (12%) 155 (21%) 39 (80%) 33 (83%) Non-Cancer Reference Dose for Adult (subsistence) 189 64% 170 (10%) 167 (12%) 149 (21%) 35 (81%) 30 (84%) Arsenic Cancer Risk for Child (recreational) 5 2% 5 (0%) 5 (0%) 2 (60%) 1 (80%) 1 (80%) Arsenic Cancer Risk for Adult (recreational) 12 4% 12 (0%) 12 (0%) 7 (42%) 2 (83%) 2 (83%) Arsenic Cancer Risk for Child (subsistence) 9 3% 9 (0%) 9 (0%) 5 (44%) 2 (78%) 2 (78%) Arsenic Cancer Risk for Adult (subsistence) 27 9% 25 (7%) 25 (7%) 19 (30%) 3 (89%) 2 (93%)

**Number of total plant-receiving waters**

297 **Option 5 Percent Reduction Under Scenario Options**  **Option 4 Evaluation Criteria**  **Modeled Plant-Receiving Waters Exceeding Criteria**  **Under Baseline Option 1**  **Option 2 Option 3** **Table 6-5. Key Environmental Improvements Under the Evaluated Regulatory Options (Continued)**

**No. %**  **Pollutants Option 3a** **Option 3b Option 4a**  Freshwater Acute NRWQC 31 10% 22 22 29% 22 22 29% 14 14 55% Arsenic -0.1670-0.1295 0.2720 Freshwater Chronic NRWQC 67 23% 57 57 15% 56 56 16% 39 39 42% Cadmium -0.2839-0.23380.2823 Human Health Water and Organism NRWQC 147 49% 127 127 14% 125 125 15% 86 86 41% Chromium VI-0.0861-0.0745 0.2920 Human Health Organism Only NRWQC 99 33% 89 89 10% 88 88 11% 61 61 38% Copper -0.1736-0.13610.2948 Drinking Water MCL 59 20% 53 53 10% 52 52 12% 36 36 39% Lead -0.1687-0.1315 0.3040 Mercury -0.2720-0.22370.2859 Fish Ingestion NEHC for Mink 99 33% 76 76 23% 75 75 24% 49 49 51% Nickel -0.2908-0.24100.2974 Fish Ingestion NEHC for Eagles 129 43% 104 104 19% 103 103 20% 69 69 47% Selenium -0.3014-0.2513 0.2410 Thallium -0.2578-0.20990.3069 Non-Cancer Reference Dose for Child (recreational) 124 42% 100 100 19% 98 98 21% 66 66 47% Zinc -0.2843-0.23520.2865 Non-Cancer Reference Dose for Adult (recreational) 128 43% 104 104 19% 102 102 20% 69 69 46% Non-Cancer Reference Dose for Child (subsistence) 196 66% 165 165 16% 163 163 17% 111 111 43% Non-Cancer Reference Dose for Adult (subsistence) 189 64% 159 159 16% 157 157 17% 106 106 44% Arsenic Cancer Risk for Child (recreational) 5 2% 3 3 40% 2 2 60% 1 1 80% Arsenic Cancer Risk for Adult (recreational) 12 4% 8 8 33% 8 8 33% 5 5 58% Arsenic Cancer Risk for Child (subsistence) 9 3% 6 6 33% 6 6 33% 4 4 56% Arsenic Cancer Risk for Adult (subsistence) 27 9% 20 20 26% 20 20 26% 14 14 48%

**Number of total plant-receiving waters**

297
**3a 3b**  **4a** Freshwater Acute NRWQC -0.2158-0.17570.2894 Freshwater Chronic NRWQC -0.2253-0.18410.2840 Human Health Water and Organism NRWQC -0.2458-0.20050.2831 Human Health Organism Only NRWQC -0.2602-0.21340.2808 Drinking Water MCL -0.2138-0.17380.2849 Fish Ingestion NEHC -0.2253-0.18410.2840 Non-Cancer Reference Dose -0.2437-0.20070.2859 Arsenic Cancer Risk -0.1670-0.12950.2720 **Correction Factors**

**Evaluation Criteria Modeled Plant-Receiving**  **Waters Exceeding Criteria Under Baseline**  **Option 3a Percent Reduction Under Scenario Options**  **Option 3b Option 4a** 

**Average Correction Factor** Arsenic, Cadmium, Chromium VI, Copper, Lead, Mercury, Nickel, Zinc Arsenic, Cadmium, Chromium VI, Copper, Lead, Mercury, Nickel, Selenium, Zinc Arsenic, Copper, Nickel, Selenium, Thallium, Zinc Arsenic, Nickel, Selenium, Thallium, Zinc **Evaluation Criteria Applicable Pollutants** 

Arsenic, Cadmium, Chromium VI, Copper, Lead, Mercury, Nickel, Selenium, Zinc Cadmium, Chromium VI, Copper, Mercury, Nickel, Selenium, Thallium, Zinc Arsenic Arsenic, Cadmium, Chromium VI, Copper Lead, Mercury, Selenium, Thallium**Table 6-15. Key Environmental Improvements for Downstream Waters Under the Evaluated Regulatory Options**

**No. %**  Freshwater Acute NRWQC 402 1% 228 43% 200 50% 160 60% 25.7 94% 25.7 94% Freshwater Chronic NRWQC 1,140 3% 953 16% 797 30% 692 39% 152 87% 161 86% Human Health Water and Organism NRWQC 11,200 31% 11,100 1% 11,100 1% 6,370 43% 854 92% 708 94% Human Health Organism Only NRWQC 4,310 12% 4,290 0% 4,280 1% 2,610 39% 280 94% 215 95% Drinking Water MCL 965 3% 953 1% 924 4% 836 13% 37.8 96% 31.5 97% Fish Ingestion NEHC for Mink 9,710 27% 7,180 26% 7,100 27% 4,400 55% 475 95% 394 96% Fish Ingestion NEHC for Eagles 15,300 42% 12,100 21% 11,900 22% 9,940 35% 1,200 92% 988 94% Non-Cancer Reference Dose for Child (recreational) 13,700 38% 10,900 20% 10,800 21% 8,520 38% 1,110 92% 934 93% Non-Cancer Reference Dose for Adult (recreational) 14,800 41% 11,500 22% 11,300 24% 9,400 36% 1,170 92% 980 93% Non-Cancer Reference Dose for Child (subsistence) 23,600 65% 21,400 9% 21,000 11% 19,200 19% 5,540 77% 5,050 79% Non-Cancer Reference Dose for Adult (subsistence) 22,400 62% 20,000 11% 19,500 13% 17,400 22% 4,640 79% 4,400 80% Arsenic Cancer Risk for Child (recreational) 6.25 0% 6.25 0% 6.25 0% 1.36 78% 1.36 78% 1.36 78% Arsenic Cancer Risk for Adult (recreational) 101 0% 101 0% 101 0% 43.2 57% 5.57 94% 5.57 94% Arsenic Cancer Risk for Child (subsistence) 68.5 0% 68.5 0% 68.5 0% 29.9 56% 1.36 98% 1.36 98% Arsenic Cancer Risk for Adult (subsistence) 266 1% 197 26% 199 25% 133 50% 18.2 93% 13.3 95%

**Number of total river miles**

36,200 **Evaluation Criteria Number of River Miles**  **Exceeding Criteria Under Baseline Conditions**  **Number of River Miles Exceeding Criteria (Percent Reduction from Baseline Conditions) Under the Regulatory Options**  **Option 1 Option 2**  **Option 3 Option 4**  **Option 5 Table 6-15. Key Environmental Improvements for Downstream Waters Under the Evaluated Regulatory Options (Continued)** 

**No. %**  **Pollutants Option 3a** **Option 3b Option 4a**  Freshwater Acute NRWQC 402 1% 212 47% 203 50% 114 72% Arsenic -0.1670-0.1295 0.2720 Freshwater Chronic NRWQC 1,140 3% 793 30% 774 32% 495 57% Cadmium -0.2839-0.2338 0.2823 Human Health Water and Organism NRWQC 11,200 31% 7,557 33% 7,338 34% 4,567 59% Chromium VI-0.0861-0.0745 0.2920 Human Health Organism Only NRWQC 4,310 12% 3,052 29% 2,973 31% 1,877 56% Copper -0.1736-0.1361 0.2948 Drinking Water MCL 965 3% 864 11% 858 11% 598 38% Lead -0.1687-0.1315 0.3040 Mercury -0.2720-0.2237 0.2859 Fish Ingestion NEHC for Mink 9,710 27% 5,596 42% 5,377 45% 3,150 68% Nickel -0.2908-0.2410 0.2974 Fish Ingestion NEHC for Eagles 15,300 42% 11,148 27% 10,927 29% 7,117 53% Selenium -0.3014-0.2513 0.2410 Thallium -0.2578-0.2099 0.3069 Non-Cancer Reference Dose for Child (recreational) 13,700 38% 9,783 29% 9,560 30% 6,084 56% Zinc -0.2843-0.2352 0.2865 Non-Cancer Reference Dose for Adult (recreational) 14,800 41% 10,716 28% 10,484 29% 6,713 55% Non-Cancer Reference Dose for Child (subsistence) 23,600 65% 20,272 14% 20,083 15% 13,711 42% Non-Cancer Reference Dose for Adult (subsistence) 22,400 62% 18,619 17% 18,403 18% 12,426 45% Arsenic Cancer Risk for Child (recreational) 6 0% 2 65% 2 68% 0.99 84% Arsenic Cancer Risk for Adult (recreational) 101 0% 53 48% 51 50% 31 69% Arsenic Cancer Risk for Child (subsistence) 69 0% 36 47% 35 49% 22 68% Arsenic Cancer Risk for Adult (subsistence) 266 1% 155 42% 150 44% 97 64%

**Number of total plant-receiving waters**

36,200
**3a 3b**  **4a** Freshwater Acute NRWQC -0.2158 -0.1757 0.2894 Freshwater Chronic NRWQC -0.2253 -0.1841 0.2840 Human Health Water and Organism NRWQC -0.2458 -0.2005 0.2831 Human Health Organism Only NRWQC -0.2602 -0.2134 0.2808 Drinking Water MCL -0.2138 -0.1738 0.2849 Fish Ingestion NEHC -0.2253 -0.1841 0.2840 Non-Cancer Reference Dose -0.2437 -0.2007 0.2859 Arsenic Cancer Risk -0.1670 -0.1295 0.2720

**Evaluation Criteria Number of River Miles**  **Exceeding Criteria Under Baseline Conditions**  **Correction Factors Option 3a**  **Option 3b Option 4a**  **Number of River Miles Exceeding Criteria (Percent Reduction from Baseline Conditions) Under the Regulatory Options** 

**Evaluation Criteria Applicable Pollutants**  **Average Correction Factor** Arsenic, Cadmium, Chromium VI, Copper, Lead, Mercury, Nickel, Zinc Arsenic, Cadmium, Chromium VI, Copper, Lead, Mercury, Nickel, Selenium, Zinc

Arsenic Arsenic, Copper, Nickel, Selenium, Thallium, Zinc Arsenic, Nickel, Selenium, Thallium, Zinc Arsenic, Cadmium, Chromium VI, Copper Lead, Mercury, Selenium, Thallium Arsenic, Cadmium, Chromium VI, Copper, Lead, Mercury, Nickel, Selenium, Zinc Cadmium, Chromium VI, Copper, Mercury, Nickel, Selenium, Thallium, Zinc

## Rivers **Lakes Rivers**  **Lakes Rivers** 

Freshwater Acute NRWQC 27 4 21 3 21
Freshwater Chronic NRWQC 53 14 51 11 46
Human Health Water and Organism NRWQC 123 24 123 24 123 Human Health Organism Only

NRWQC 84 15 84 15 84 Drinking Water MCL 47 12 46 12 43**Total Number of Unique Plant Receiving Waters** c 

## 123 24 123 24 123
Directions: Automated based on values in Table 1. **Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4** Freshwater Acute NRWQC 31 24 24 20 5
Freshwater Chronic NRWQC 67 62 56 54 16
Human Health Water and Organism NRWQC 147 147 147 120 48 Human Health Organism Only

NRWQC 99 99 99 85 28 Drinking Water MCL 59 58 54 51 5
Directions: Automated based on values in Table 1. **Evaluation Criteria Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Freshwater Acute NRWQC 23 23 35 84 84
Freshwater Chronic NRWQC 7 16 19 76 76 **Number of Plant-Receiving Waters Table 1. Number of Plant-Receiving Waters that Exceeded a Standard by Receiving Water Type and Standard Type**  **Number of Exceedances Under Scenario 2** 

**Evaluation Criteria Evaluation Criteria**  **Number of Exceedances Under Baseline**  **Number of Exceedances Under Scenario 1** 

## Human Health

Water and Organism NRWQC 0 0 18 67 66 Human Health Organism Only

NRWQC 0 0 14 72 76 Drinking Water MCL 2 8 14 92 92
Directions: Transcribe the values in the table below. **Evaluation Criteria Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Freshwater Acute NRWQC 23 23 35 84 84
Freshwater Chronic NRWQC 7 16 19 76 76
Human Health Water and Organism NRWQC 0 0 18 67 66 Human Health Organism Only

NRWQC 0 0 14 72 76 Drinking Water MCL 2 8 14 92 92

## Lakes **Rivers Lakes**  **Rivers Lakes**  **Rivers Lakes** 

3 18 2 5 0 5 0
10 44 10 16 0 16 0
24 99 21 40 8 45 5
15 71 14 27 1 23 1 11 40 11 5 0 5 0 24 99 21 40 8 45 5

**Scenario 5** 5
16
50
24 5 **Number of Exceedances Under Scenario 5**  **Table 1. Number of Plant-Receiving Waters that Exceeded a Standard by Receiving Water Type and Standard Type Number of Exceedances**  **Under Scenario 2 Number of Exceedances**  **Under Scenario 3 Number of Exceedances**  **Under Scenario 4**

## Table 7. Number of Plant-Receiving Waters that Exceed Wildlife Fish Ingestion Hazard Quotients for Mink, by Receiving Water Type
**Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Lakes, Ponds, and Reservoirs 22 19 16 15 1 0 Rivers and Streams 77 72 67 54 14 15 **Table 8. Number of Plant-Receiving Waters that Exceed Wildlife Fish Ingestion Hazard Quotients for Eagles, by Receiving Water Type**

**Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Lakes, Ponds, and Reservoirs 28 25 22 20 1 0 Rivers and Streams 101 93 88 77 16 17 **Number (%) of Plant-Receiving Waters with HQmink >1**

**Number (%) of Plant-Receiving Waters with HQeagle >1**

## Table 7. Number of Plant-Receiving Waters that Exceed Wildlife Fish Ingestion Hazard Quotients for Mink, by Receiving Water Type
**Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Total number 99 91 83 69 15 15 Percent Reduction 8 16 30 85 85 **Table 8. Number of Plant-Receiving Waters that Exceed Wildlife Fish Ingestion Hazard Quotients for Eagles, by Receiving Water Type**
**Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Total number 129 118 110 97 17 17 Percent Reduction 9 15 25 87 87

## Directions: Transcribe the numbers in the table below. **Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Total number 99 91 83 69 15 15 Percent Reduction 8 16 30 85 85

**Directions: Transcribe the numbers in the table below.**

**Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Total number 129 118 110 97 17 17 Percent Reduction 9 15 25 87 87

## Table 9. Total Number of Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Oral Reference Doses)
**Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Child (recreational) 124 109 106 92 12 10 Adult (recreational) 128 114 109 96 12 10 Child (subsistence) 196 179 173 155 39 33 Adult (subsistence) 189 170 167 149 35 30 **Table 10. Percent Reduction in Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Oral Reference Doses)**

**Scenario 1 Scenario 2** **Scenario 3 Scenario 4** **Scenario 5** Child (recreational) 12 15 26 90 92 Adult (recreational) 11 15 25 91 92 Child (subsistence) 9 12 21 80 83 Adult (subsistence) 10 12 21 81 84
Directions: Transcribe the numbers in the table below.

**Scenario 1 Scenario 2** **Scenario 3 Scenario 4** **Scenario 5** Child (recreational) 12 15 26 90 92 Adult (recreational) 11 15 25 91 92 Child (subsistence) 9 12 21 80 83 Adult (subsistence) 10 12 21 81 84

**Number of Plant-Receiving Waters where HQ>1 for Non-Cancer**

**Reference Doses**

**Percent Reduction in Number of Plant-Receiving Waters where HQ>1 for NonCancer Reference Doses** 

**Cohort Description**  **Cohort Description**  **Cohort Description** 

**Percent Reduction in Number of Plant-Receiving Waters**

**where HQ>1 for NonCancer Reference Doses**

## Table 9. Total Number of Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Oral Reference Doses)

**Table 10. Percent Reduction in Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Oral Reference Doses)**

## Table 11. Total Number of Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Life-time Excess Cancer Risk) for Arsenic **Baseline Scenario 1** **Scenario 2 Scenario 3** **Scenario 4 Scenario 5**  Child (recreational) 5 5 5 2 1 1 Adult (recreational) 12 12 12 7 2 2 Child (subsistence) 9 9 9 5 2 2 Adult (subsistence) 27 25 25 19 3 2 **Table 12. Percent Reduction in Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Life-time Excess Cancer Risk) for Arsenic**

**Scenario 1 Scenario 2** **Scenario 3 Scenario 4** **Scenario 5** Child (recreational) 0 0 60 80 80 Adult (recreational) 0 0 42 83 83 Child (subsistence) 0 0 44 78 78 Adult (subsistence) 7 7 30 89 93
Directions: Copy and paste the numbers in the table below.

**Scenario 1 Scenario 2** **Scenario 3 Scenario 4** **Scenario 5** Child (recreational) 0 0 60 80 80 Adult (recreational) 0 0 42 83 83 Child (subsistence) 0 0 44 78 78 Adult (subsistence) 7 7 30 89 93 **Cohort Description**  **Number (%) of Plant-Receiving Waters where LECR Exceeds 10-6**

**Percent Reduction in Number of Plant-Receiving Waters**

**where LECR Exceeds 10-6 Percent Reduction in Number of Plant-Receiving Waters** 

**where LECR Exceeds 10-6 Cohort**  **Description Cohort**  **Description**

## Table 11. Total Number of Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Life-time Excess Cancer Risk) for Arsenic

**Table 12. Percent Reduction in Plant/Receiving Waters Exceeding Human Health Evaluation Criteria (Life-time Excess Cancer Risk) for Arsenic**