## Appendix 8

Draft Detailed Acute Risk Modeling Results

### Acute Modeling Approach Initial acute screening risk calculations were performed with the HEM

-3 model. HEM

-3 estimates acute (1

-hour) concentrations at both polar and census block receptors, which are presented in Appendix 6

- Table 3. It is assumed for this short period of time that an exposed individual could be located at any off

-site location. The lack of readily available detailed property boundary information for many of the facilities evaluated made it difficult to determine whether receptors were on
- or off

-site. In the absence of such information, the first ring of polar receptors was placed 100 meters from the plant center for many facilities. However, these polar rings often transected on

-site locations, restricting public access to exposures at these levels and thereby overestimating exposures. The screening approach used by HEM

-3 to estimate maximum 1

-hour exposures
are likely overestimates. To estimate maximum 1

-hour concentrations at each receptor, HEM

-3 sums the maximum concentrations attributed to each source, regardless of whether those maximum concentrations occurred during the same hour. In other words, HEM

-3 assumes that the maximum impact from each source at each receptor occurs at the same time. In actuality, maximum impacts from different sources may occur at different times. In accordance with our mandate in Section 112 of the Clean Air Act, we use the point of highest off

-site exposure to assess the potential risk to the maximally exposed individual. In some cases, the Agency may choose to refine the above acute screen by also assessing the exposure that may occur at a centroid of census block

. Thisrefinement reduces the uncertainty in the assessment because we are evaluating the potential for exposures to occur at locations where people could actually live, rather than at the point of maximum off

-site concentration. For this source category we refined the acute assessment in this manner for facilities where concentrations exceeded the REL for arsenic and hydrogen fluoride at the site of maximum impact. This appendix includes the MIR results ofthisrefined acute assessments performed for facilities that exceeded short

-term health benchmarks using the HEM

-3 approach, refer to Table 1

. For a detailed accounting of all census blocks that exceeded the acute benchmarks for this source category refer to Table 2.
The refinements can address both areas of conservatism described above. The simplest refinement is to plot the HEM

-3 polar grid and census blockresults on aerial photographs of the facilities

. This allows the assessment of off

-site locations that may be accessible to the public (e.g., roadways and publicbuildings.) as well as the centroid locations for populated census blocks

. In cases where this refinement results in lower acute risks no further refinement is necessary. However, if acute risk still remain at or near levels of concern a further refinement is conducted. This second refinement includes remodeling with the AERMOD model directly (instead of using HEM) to estimate maximum 1

-hour concentrations at each receptor by pairing individual source impacts in time and space.

### The AERMOD results are then plotted on aerial photographs as noted above to determine

off

-site impacts. Modeling with AERMOD also allows the estimation of the frequency of higher impacts at or above the health levels of concern.
The attached Figures present the estimated HQ values from HEM

-3 (the modeled 1

-hour concentration of a pollutant divided by its short

-termhealth benchmark) at the polar and residentialreceptors near the facilities. Each set of figures is prefaced with a description of the maximum and residential off

-site hazard quotient value and where that value
occurs for all operating plants. Refer below for a brief summary with all HQ values reported to 1 significant figure;

• NEI32661; maximum offsite acute HQ(REL) 

### for arsenic of20;Northeast of plant Highway 66 and HQ = 10 at the residential receptor; East of the plant

.
• NEI42328 maximum offsite acute HQ(REL) 

### for arsenic of 30; South of plant and HQ = 10 at the residential receptor; West of the plant.

• NEI6464; maximum offsite acute HQ(REL) 

### for arsenic of 10; West of plant and HQ = 10 at the residential receptor; West of the plant.

• NEI39458; maximum offsite acute HQ(REL) 

### for arsenic of 10; North of plant Highway 131 and HQ = 5 at the residential receptor; South of the plant.

• NEI700; maximum offsite acute HQ(REL) 

### for arsenic of 8; Northwest of plant Highway 124 and HQ = 7 at the residential receptor; East of the plant.

• NEI34464; maximum offsite acute HQ(REL) 

### for arsenic of 7; Northwest of plant of of I

-55 and HQ = 5 at the residential receptor; Southwest of the plant.

• NEI11365; maximum offsite acute HQ(REL) 

### for arsenic of 4; West of plant Highway 9004 and HQ = 3 at the residential receptor; West of the plant

• NEI41217; maximum offsite acute HQ(REL) 

### for arsenic of 2; Northeast of plant Highway 52 and HQ = 2 at the residential receptor; Northeast of the plant.

• NEI32661; maximum offsite acute HQ(REL) 

### for HF of 2; Northeast of plant Highway 66 and HQ = 2 at the residential receptor; East of the plant.

• NEI6464; maximum offsite acute HQ(REL) 

### for HF of 2; West of plant and HQ = 2 at the residential receptor; West of the plant. An evaluation of the population impacts from the maximum hourly HQ (REL) value for arsenic identified 8 active plants with HQ values greater than 1.We estimate that about 170 people could be exposed to concentrations leading to a HQ of 10, about 1500 people could be exposed to a concentration leading to a HQ greater than 5, and that about 8500 people could be exposed to a concentration leading to a HQ greater than 1. These population impact estimates are based upon a 3 kilometer distance from the emission
source to ensure we identify the census block with the highest MIR value for acute non

cancer impacts. This assessment still assumes that in order to reach an HQ greater than one peak emissions from the source category and worst

-case meteorological conditions
co
-occur. We expect that this would happen for very few hours of the 8760 hours that are in a year. Refer to Table 3 for abreakdown of population risks.

### Facility NEI ID HAP HEM-3 Screen Model Value GIS Overlay HEM-3 HQ Value Population

Exposed NEI32661 Arsenic cpds 35 19 14 59 NEIOH1110001 1 

### Arsenic cpds 51 21 13 4 NEI42328 Arsenic cpds 54 34 13 10 NEI6464 Arsenic cpds 28 10 10 7 NEI39458 Arsenic cpds 12 10 5 26 NEI700 Arsenic cpds 20 8 7 105 NEI34464 Arsenic cpds 14 7 5 2 NEI46970 1 

### Arsenic cpds 25 11 5 169 NEI11365 Arsenic cpds 8 4 3 3 NEI41217 Arsenic cpds 16 2 2 2 NEI32661 Hydrofluoric acid 5 3 2 59 NEIOH1110001 1 

### Hydrofluoric acid 7 5 2 4 NEI6464 Hydrofluoric acid 5 2 2 7
1 -- Indicates facility has either ceased operations or have gone bankrupt Table 1: Summary of Refined Acute Analysis for Maximum Off-site and Residential Impacts

Maximum HQ Off-site Maximum HQ Residential ExposureNEI ID Census Block ID Population of Census Block LAT LON Pollutant Maximum Hourly HQ (REL) 18173NEI32661 305004067 59 37.9132 -87.3113 arsenic 14 18173NEI32661 305004037 92 37.92372 -87.3059 arsenic 12 18173NEI32661 305004046 25 37.93063 -87.3504 arsenic 9 18173NEI32661 305004039 13 37.91816 -87.2999 arsenic 9 18173NEI32661 305004030 2 37.94075 -87.3332 arsenic 9 18173NEI32661 305004021 30 37.93376 -87.3029 arsenic 9 18173NEI32661 207014007 1 37.89719 -87.3356 arsenic 7 18173NEI32661 305004024 6 37.94741 -87.328 arsenic 7 18173NEI32661 305004055 13 37.93749 -87.3513 arsenic 7 18173NEI32661 305004080 4 37.93056 -87.3627 arsenic 7 18173NEI32661 305004056 4 37.94119 -87.3521 arsenic 7 21101NEI11365 208001051 3 37.6613 -87.517 arsenic 3 21101NEI11365 208001052 3 37.67231 -87.5155 arsenic 2 21101NEI11365 208001050 18 37.6649 -87.5237 arsenic 2 21101NEI11365 208001049 2 37.66412 -87.5257 arsenic 2 21101NEI11365 208001032 3 37.67526 -87.5205 arsenic 2 21101NEI11365 208001033 7 37.67625 -87.5204 arsenic 2 21101NEI11365 208001040 5 37.66671 -87.5313 arsenic 2 21101NEI11365 208001037 58 37.67281 -87.5227 arsenic 2 21101NEI11365 208001098 36 37.68604 -87.5068 arsenic 2 21101NEI11365 9702001015 2 37.65913 -87.4752 arsenic 2 21101NEI11365 208001031 56 37.6777 -87.5179 arsenic 2 21101NEI11365 208001059 5 37.65434 -87.5337 arsenic 2 21101NEI11365 9601001024 8 37.64234 -87.5216 arsenic 2 29143NEI34464 9604002173 2 36.49747 -89.5981 arsenic 5 29143NEI34464 9604002127 1 36.52411 -89.5951 arsenic 5 29143NEI34464 9604002133 2 36.52606 -89.5866 arsenic 5 29143NEI34464 9604002140 5 36.51673 -89.5966 arsenic 4 36089NEI39458 4901002139 26 44.96403 -74.9146 arsenic 5 36089NEI39458 4901002204 41 44.94557 -74.8983 arsenic 5 36089NEI39458 4901002212 20 44.94539 -74.8956 arsenic 5 36089NEI39458 4902002015 3 44.94588 -74.9012 arsenic 5 36089NEI39458 4901002203 34 44.94455 -74.8982 arsenic 4 36089NEI39458 4901002202 198 44.9454 -74.8999 arsenic 4 36089NEI39458 4901002205 113 44.94441 -74.8966 arsenic 4 36089NEI39458 4902002011 13 44.94917 -74.9125 arsenic 4 36089NEI39458 4901002249 31 44.94369 -74.8976 arsenic 4 36089NEI39458 4901002206 33 44.94419 -74.8939 arsenic 4 36089NEI39458 4902002020 32 44.94349 -74.9022 arsenic 4 36089NEI39458 4901002248 69 44.94316 -74.8964 arsenic 4 36089NEI39458 4901002012 13 44.96118 -74.9207 arsenic 4 36089NEI39458 4901002247 72 44.94268 -74.8951 arsenic 4 36089NEI39458 4901003000 78 44.94241 -74.8983 arsenic 4 36089NEI39458 4902002018 17 44.94279 -74.9003 arsenic 4 36089NEI39458 4902002010 5 44.94979 -74.9209 arsenic 4 Residential Receptors with HQ (REL) > 1 Table 2: Residential Receptors Impacted with HQ Values greater than 1 Primary Aluminum Reduction Plants Source Category36089NEI39458 4901002207 31 44.94366 -74.893 arsenic 4

36089NEI39458 4902002012 490 44.94166 -74.9111 arsenic 4 36089NEI39458 4902002006 10 44.95163 -74.9229 arsenic 4 36089NEI39458 4902002005 1 44.95363 -74.9246 arsenic 4 36089NEI39458 4901004007 65 44.94181 -74.8948 arsenic 4 36089NEI39458 4902002016 29 44.94198 -74.9015 arsenic 4 36089NEI39458 4901004006 30 44.94259 -74.8931 arsenic 3 36089NEI39458 4901002209 104 44.94249 -74.8904 arsenic 3 36089NEI39458 4902002023 70 44.94005 -74.8998 arsenic 3 36089NEI39458 4901004008 53 44.94111 -74.8943 arsenic 3 36089NEI39458 4901003001 41 44.94044 -74.8968 arsenic 3 36089NEI39458 4901004005 37 44.94203 -74.8922 arsenic 3 36089NEI39458 4902001000 189 44.93789 -74.8988 arsenic 3 36089NEI39458 4901004003 67 44.94101 -74.8903 arsenic 3 36089NEI39458 4901004004 101 44.94091 -74.8926 arsenic 3 36089NEI39458 4902002022 7 44.94147 -74.9203 arsenic 3 36089NEI39458 4902001013 97 44.93648 -74.9022 arsenic 3 36089NEI39458 4902002017 7 44.93951 -74.9185 arsenic 3 36089NEI39458 4901002133 19 44.96428 -74.8692 arsenic 3 36089NEI39458 4904003008 5 44.94693 -74.928 arsenic 3 36089NEI39458 4901004011 30 44.94006 -74.8901 arsenic 3 36089NEI39458 4901004013 55 44.93986 -74.8929 arsenic 3 36089NEI39458 4901004002 1 44.94086 -74.8892 arsenic 3 36089NEI39458 4901004000 91 44.93984 -74.8864 arsenic 3 36089NEI39458 4901004001 78 44.94052 -74.8881 arsenic 3 36089NEI39458 4901002237 109 44.94046 -74.8856 arsenic 3 36089NEI39458 4902002021 21 44.93638 -74.9072 arsenic 3 36089NEI39458 4901002132 5 44.96706 -74.8687 arsenic 3 36089NEI39458 4902001014 106 44.93644 -74.8965 arsenic 3 36089NEI39458 4901004012 63 44.93924 -74.8923 arsenic 3 36089NEI39458 4902002024 43 44.93455 -74.9137 arsenic 3 36089NEI39458 4901004010 79 44.93943 -74.8889 arsenic 3 36089NEI39458 4901004015 9 44.93849 -74.8897 arsenic 3 36089NEI39458 4901003002 138 44.9373 -74.8942 arsenic 3 36089NEI39458 4901001005 56 44.93909 -74.8845 arsenic 3 36089NEI39458 4901004014 91 44.93839 -74.8918 arsenic 3 36089NEI39458 4901001016 37 44.93763 -74.8857 arsenic 3 36089NEI39458 4901004017 2 44.93781 -74.8901 arsenic 3 36089NEI39458 4901001004 24 44.93836 -74.8826 arsenic 2 36089NEI39458 4902001006 10 44.93419 -74.8967 arsenic 2 36089NEI39458 4901001019 52 44.93705 -74.8866 arsenic 2 36089NEI39458 4902001012 22 44.93468 -74.9065 arsenic 2 36089NEI39458 4902001004 2 44.9342 -74.8963 arsenic 2 36089NEI39458 4901003005 21 44.93697 -74.8888 arsenic 2 36089NEI39458 4903006083 34 44.9488 -74.8534 arsenic 2 36089NEI39458 4902001001 249 44.93391 -74.9039 arsenic 2 36089NEI39458 4902001007 3 44.93353 -74.8966 arsenic 2 36089NEI39458 4901003004 48 44.93609 -74.8896 arsenic 2 36089NEI39458 4901003006 7 44.93648 -74.8875 arsenic 2 36089NEI39458 4901001008 18 44.93746 -74.883 arsenic 2 36089NEI39458 4901003003 52 44.93671 -74.8911 arsenic 2 36089NEI39458 4901001018 48 44.93617 -74.8843 arsenic 236089NEI39458 4901001015 46 44.9369 -74.8838 arsenic 2

36089NEI39458 4901001003 53 44.93735 -74.8802 arsenic 2 36089NEI39458 4901002162 54 44.96188 -74.861 arsenic 2 36089NEI39458 4901001013 71 44.93672 -74.881 arsenic 2 36089NEI39458 4901003009 22 44.93528 -74.8865 arsenic 2 36089NEI39458 4903006112 135 44.94609 -74.8543 arsenic 2 36089NEI39458 4901001014 73 44.93609 -74.8817 arsenic 2 36089NEI39458 4901001023 15 44.93532 -74.8845 arsenic 2 36089NEI39458 4901003013 3 44.93477 -74.8928 arsenic 2 36089NEI39458 4901003010 49 44.93488 -74.89 arsenic 2 36089NEI39458 4901003008 33 44.93451 -74.8864 arsenic 2 36089NEI39458 4901003007 105 44.93462 -74.8881 arsenic 2 36089NEI39458 4901001002 54 44.93637 -74.8789 arsenic 2 36089NEI39458 4901001021 68 44.93541 -74.8824 arsenic 2 36089NEI39458 4901001001 2 44.93676 -74.8781 arsenic 2 36089NEI39458 4901001022 57 44.93466 -74.8833 arsenic 2 36089NEI39458 4903003002 1 44.93639 -74.8723 arsenic 2 36089NEI39458 4901003020 21 44.93378 -74.8863 arsenic 2 36089NEI39458 4902004001 5 44.93109 -74.8952 arsenic 2 36089NEI39458 4903002023 8 44.93268 -74.8921 arsenic 2 36089NEI39458 4901001020 31 44.9337 -74.8833 arsenic 2 36089NEI39458 4901001012 22 44.93519 -74.8796 arsenic 2 36089NEI39458 4903001001 18 44.93139 -74.8921 arsenic 2 36089NEI39458 4902004000 8 44.93123 -74.8936 arsenic 2 36089NEI39458 4903002009 37 44.93276 -74.8904 arsenic 2 36089NEI39458 4903002022 1 44.93245 -74.8907 arsenic 2 36089NEI39458 4903002003 47 44.9328 -74.8782 arsenic 2 36089NEI39458 4903002002 122 44.93197 -74.8816 arsenic 2 36089NEI39458 4903001000 60 44.93057 -74.8893 arsenic 2 36089NEI39458 4901002130 26 44.96443 -74.8505 arsenic 2 36089NEI39458 4903002010 62 44.93083 -74.887 arsenic 2 36089NEI46970 4903005002 169 44.97041 -74.7453 arsenic 5 36089NEI46970 4903006001 4 44.98273 -74.7281 arsenic 4 36089NEI46970 4903005004 1 44.97438 -74.7321 arsenic 4 36089NEI46970 4901002100 27 44.98112 -74.7821 arsenic 4 36089NEI46970 9400001022 3 44.97895 -74.7224 arsenic 3 36089NEI46970 4903005016 45 44.96238 -74.7472 arsenic 3 36089NEI46970 4903005015 31 44.95789 -74.7583 arsenic 3 36089NEI46970 1 4903006067 2 44.96468 -74.784 arsenic 3 36089NEI46970 1 4903005009 22 44.95852 -74.7709 arsenic 3 36089NEI46970 1 9400001021 10 44.97816 -74.7213 arsenic 3 36089NEI46970 1 9400001030 15 44.97683 -74.7189 arsenic 3 36089NEI46970 1 4903005007 23 44.96092 -74.7343 arsenic 2 36089NEI46970 1 9400001008 205 44.99034 -74.7168 arsenic 2 39111NEIOH1110001 1 49002028 4 39.69464 -80.8521 arsenic 13 39111NEIOH1110001 1 9666004005 25 39.71372 -80.862 arsenic 9 39111NEIOH1110001 1 49002035 319 39.68825 -80.8498 arsenic 8 39111NEIOH1110001 1 49001000 37 39.68819 -80.8529 arsenic 7 39111NEIOH1110001 1 49001016 29 39.68606 -80.85 arsenic 7 39111NEIOH1110001 1 49001017 39 39.68535 -80.8491 arsenic 639111NEIOH1110001 1 49001001 4 39.68888 -80.8546 arsenic 6

39111NEIOH1110001 1 49002025 60 39.69106 -80.8568 arsenic 6 39111NEIOH1110001 1 304001054 5 39.71165 -80.8245 arsenic 6 39111NEIOH1110001 1 49001015 157 39.68562 -80.8538 arsenic 6 39111NEIOH1110001 1 9666004003 20 39.72506 -80.8457 arsenic 6 39111NEIOH1110001 1 304001048 5 39.71532 -80.8243 arsenic 6 39111NEIOH1110001 1 9666004024 3 39.69527 -80.8611 arsenic 6 39111NEIOH1110001 1 304001049 33 39.71252 -80.8233 arsenic 6 39111NEIOH1110001 1 49002011 2 39.7084 -80.8244 arsenic 6 39111NEIOH1110001 1 49001022 25 39.68258 -80.8474 arsenic 6 39111NEIOH1110001 1 49001004 16 39.68834 -80.8566 arsenic 6 39111NEIOH1110001 1 304001041 5 39.7153 -80.8227 arsenic 6 39111NEIOH1110001 1 304001051 23 39.71123 -80.8236 arsenic 6 39111NEIOH1110001 1 49001005 8 39.6885 -80.8578 arsenic 5 39111NEIOH1110001 1 9666002087 1 39.7261 -80.8557 arsenic 5 39111NEIOH1110001 1 49002015 14 39.70792 -80.8232 arsenic 5 39111NEIOH1110001 1 49001014 9 39.68682 -80.8558 arsenic 5 39111NEIOH1110001 1 49001019 3 39.68821 -80.8574 arsenic 5 39111NEIOH1110001 1 304001073 10 39.68824 -80.8111 arsenic 5 39111NEIOH1110001 1 49001021 44 39.68244 -80.8504 arsenic 5 39111NEIOH1110001 1 49001020 112 39.68369 -80.8549 arsenic 5 39111NEIOH1110001 1 49001013 13 39.68745 -80.8567 arsenic 5 39111NEIOH1110001 1 49001008 32 39.68864 -80.8587 arsenic 5 39111NEIOH1110001 1 49001012 6 39.68778 -80.8575 arsenic 5 39111NEIOH1110001 1 49002032 123 39.68002 -80.8492 arsenic 5 39111NEIOH1110001 1 49001006 65 39.68687 -80.8589 arsenic 5 39111NEIOH1110001 1 49002000 2 39.70654 -80.8199 arsenic 5 39111NEIOH1110001 1 49002034 43 39.67984 -80.8553 arsenic 5 39111NEIOH1110001 1 49001009 19 39.68503 -80.8581 arsenic 5 39111NEIOH1110001 1 49003029 28 39.68363 -80.8576 arsenic 4 39111NEIOH1110001 1 49001010 21 39.68514 -80.8589 arsenic 4 39111NEIOH1110001 1 304001043 2 39.71922 -80.8207 arsenic 4 39111NEIOH1110001 1 49001011 8 39.6854 -80.8607 arsenic 4 39111NEIOH1110001 1 49001007 18 39.68529 -80.86 arsenic 4 39111NEIOH1110001 1 49003014 10 39.68373 -80.8583 arsenic 4 39111NEIOH1110001 1 49001018 4 39.68537 -80.8611 arsenic 4 39111NEIOH1110001 1 49002038 61 39.67833 -80.8558 arsenic 4 39111NEIOH1110001 1 49002039 22 39.67864 -80.8544 arsenic 4 39111NEIOH1110001 1 49002037 6 39.67836 -80.8571 arsenic 4 39111NEIOH1110001 1 49002033 29 39.67683 -80.8479 arsenic 4 39111NEIOH1110001 1 49003015 31 39.68382 -80.8591 arsenic 4 39111NEIOH1110001 1 49003013 27 39.68177 -80.8582 arsenic 4 39111NEIOH1110001 1 304001035 2 39.72061 -80.8202 arsenic 4 39111NEIOH1110001 1 209004110 7 39.72599 -80.8187 arsenic 439111NEIOH1110001 1 49002041 23 39.67763 -80.855 arsenic 4

39111NEIOH1110001 1 49002045 46 39.67749 -80.8534 arsenic 4 39111NEIOH1110001 1 49003016 37 39.68398 -80.8603 arsenic 4 39111NEIOH1110001 1 49002040 25 39.67757 -80.8543 arsenic 4 39111NEIOH1110001 1 49003020 8 39.68292 -80.8595 arsenic 4 39111NEIOH1110001 1 49003017 9 39.68397 -80.8611 arsenic 4 39111NEIOH1110001 1 49003011 8 39.679 -80.8585 arsenic 4 39111NEIOH1110001 1 304001039 16 39.70916 -80.8123 arsenic 4 39111NEIOH1110001 1 49003021 29 39.68164 -80.8595 arsenic 4 39111NEIOH1110001 1 49002042 13 39.67659 -80.8556 arsenic 4 39111NEIOH1110001 1 49003019 23 39.68295 -80.8605 arsenic 4 39111NEIOH1110001 1 49003024 22 39.68101 -80.8597 arsenic 4 39111NEIOH1110001 1 49003018 55 39.68251 -80.8604 arsenic 4 39111NEIOH1110001 1 49003025 22 39.68016 -80.8597 arsenic 4 39111NEIOH1110001 1 49003022 14 39.68173 -80.8606 arsenic 4 39111NEIOH1110001 1 49003028 20 39.67912 -80.8599 arsenic 4 39111NEIOH1110001 1 49003023 20 39.6811 -80.8608 arsenic 4 39111NEIOH1110001 1 49003000 13 39.68246 -80.8622 arsenic 4 39111NEIOH1110001 1 49003026 25 39.68026 -80.8609 arsenic 4 39111NEIOH1110001 1 49003027 23 39.67922 -80.861 arsenic 3 39111NEIOH1110001 1 49003003 6 39.68037 -80.8618 arsenic 3 39111NEIOH1110001 1 49003002 7 39.67933 -80.8618 arsenic 3 39111NEIOH1110001 1 304001069 22 39.69654 -80.8104 arsenic 3 39111NEIOH1110001 1 304001028 2 39.70041 -80.8071 arsenic 3 39111NEIOH1110001 1 304001027 3 39.69659 -80.808 arsenic 3 45015NEI41217 207071084 2 33.0573 -80.0329 arsenic 2 45015NEI41217 207071061 50 33.0613 -80.0326 arsenic 2 45015NEI41217 207071062 11 33.06081 -80.0322 arsenic 2 45015NEI41217 207071085 13 33.05946 -80.0315 arsenic 2 45015NEI41217 207071072 4 33.05695 -80.0302 arsenic 2 45015NEI41217 207071064 11 33.06135 -80.0318 arsenic 2 45015NEI41217 207182000 28 33.0432 -80.0765 arsenic 2 45015NEI41217 207071080 18 33.05759 -80.0285 arsenic 2 45015NEI41217 207181018 17 33.04501 -80.0785 arsenic 2 45015NEI41217 207182002 29 33.04172 -80.0762 arsenic 2 45015NEI41217 207182023 40 33.04181 -80.0775 arsenic 2 45015NEI41217 207071073 14 33.05317 -80.0268 arsenic 2 45015NEI41217 207072008 23 33.03232 -80.0547 arsenic 2 45015NEI41217 207182024 87 33.0421 -80.0783 arsenic 2 45015NEI41217 207182001 21 33.0435 -80.079 arsenic 2 45015NEI41217 207071071 17 33.06348 -80.0291 arsenic 2 45015NEI41217 207071079 10 33.05619 -80.0258 arsenic 2 45015NEI41217 207191002 124 33.04031 -80.0723 arsenic 2 45015NEI41217 207181020 9 33.0459 -80.0811 arsenic 2 45015NEI41217 207181021 59 33.04542 -80.0812 arsenic 2 45015NEI41217 207182025 78 33.04148 -80.0794 arsenic 2 45015NEI41217 207181019 97 33.04651 -80.0825 arsenic 245015NEI41217 207072011 11 33.03064 -80.0542 arsenic 2

45015NEI41217 207191003 137 33.04007 -80.0741 arsenic 2 45015NEI41217 207181022 39 33.04465 -80.0816 arsenic 2 45015NEI41217 207071040 25 33.07528 -80.0635 arsenic 2 45015NEI41217 208071011 250 33.03736 -80.0308 arsenic 2 45015NEI41217 207182026 26 33.04164 -80.0801 arsenic 2 45015NEI41217 207071060 15 33.06916 -80.0319 arsenic 2 45015NEI41217 207182027 52 33.04001 -80.0792 arsenic 2 45015NEI41217 207182008 20 33.04146 -80.0806 arsenic 2 45015NEI41217 207071070 32 33.06639 -80.0282 arsenic 2 45015NEI41217 207182005 156 33.04155 -80.0811 arsenic 2 45015NEI41217 207071074 1 33.05715 -80.0228 arsenic 2 48331NEI6464 9508001145 7 30.5577 -97.0886 arsenic 10 48331NEI6464 9508001158 7 30.55145 -97.0834 arsenic 9 48331NEI6464 9508001214 5 30.5435 -97.1004 arsenic 4 53007NEI42328 9612001008 10 47.36124 -120.143 arsenic 13 53007NEI42328 9503005008 3 47.36849 -120.124 arsenic 11 53007NEI42328 9503005059 2 47.37042 -120.136 arsenic 9 53007NEI42328 9503005012 67 47.37193 -120.136 arsenic 9 53007NEI42328 9503005047 24 47.37174 -120.141 arsenic 8 53007NEI42328 9503005057 35 47.3727 -120.147 arsenic 8 53007NEI42328 9503005050 50 47.37317 -120.142 arsenic 8 53007NEI42328 9503005049 10 47.37467 -120.141 arsenic 8 53007NEI42328 9503005051 70 47.37349 -120.143 arsenic 8 53007NEI42328 9503005011 15 47.37441 -120.14 arsenic 8 53007NEI42328 9503005009 5 47.37482 -120.131 arsenic 8 53007NEI42328 9503005036 18 47.37267 -120.155 arsenic 8 53007NEI42328 9503005016 33 47.37581 -120.142 arsenic 7 53007NEI42328 9503005048 78 47.37264 -120.145 arsenic 7 53007NEI42328 9503005052 27 47.37424 -120.144 arsenic 7 53007NEI42328 9503005017 26 47.37608 -120.143 arsenic 7 53007NEI42328 9503005056 20 47.37422 -120.149 arsenic 7 53007NEI42328 9503005053 50 47.37424 -120.145 arsenic 7 53007NEI42328 9503005055 51 47.37423 -120.148 arsenic 7 53007NEI42328 9503005021 8 47.37468 -120.15 arsenic 6 53007NEI42328 9503005054 66 47.37423 -120.146 arsenic 6 53007NEI42328 9503004017 28 47.37949 -120.138 arsenic 6 53007NEI42328 9503005018 51 47.37643 -120.145 arsenic 6 53007NEI42328 9503005019 11 47.37579 -120.146 arsenic 6 53007NEI42328 9503004019 15 47.38007 -120.145 arsenic 6 53007NEI42328 9503005022 105 47.37507 -120.155 arsenic 6 53007NEI42328 9503004038 15 47.37809 -120.135 arsenic 6 53007NEI42328 9503004026 82 47.37824 -120.146 arsenic 6 53007NEI42328 9503004032 4 47.37914 -120.148 arsenic 5 53007NEI42328 9503004030 12 47.37873 -120.153 arsenic 5 53007NEI42328 9503004002 12 47.38143 -120.148 arsenic 5 53007NEI42328 9503004031 8 47.37874 -120.15 arsenic 5 53007NEI42328 9612001133 5 47.33049 -120.107 arsenic 4 53007NEI42328 9612001119 8 47.36096 -120.16 arsenic 4 53007NEI42328 9503005001 20 47.37043 -120.111 arsenic 2 53007NEI42328 9612001017 23 47.35847 -120.163 arsenic 1 54035NEI700 9634001041 105 38.92838 -81.8123 arsenic 754035NEI700 9634002028 5 38.92125 -81.8134 arsenic 6

54035NEI700 9634002024 8 38.91999 -81.8123 arsenic 5 54035NEI700 9646004042 10 38.9424 -81.8453 arsenic 5 54035NEI700 9646001064 2 38.95426 -81.8129 arsenic 5 54035NEI700 9634002021 32 38.91833 -81.8181 arsenic 5 54035NEI700 9646001065 6 38.94887 -81.8109 arsenic 5 54035NEI700 9646001063 6 38.95245 -81.8052 arsenic 4 54035NEI700 9634001145 22 38.92878 -81.8082 arsenic 4 54035NEI700 9646004051 6 38.9348 -81.8476 arsenic 4 54035NEI700 9634001044 20 38.929 -81.803 arsenic 4 54035NEI700 9646001071 4 38.9443 -81.7988 arsenic 4 54035NEI700 9646004049 73 38.92825 -81.8553 arsenic 3 54035NEI700 9646004012 3 38.95537 -81.8365 arsenic 3 54035NEI700 9646001072 5 38.9348 -81.7889 arsenic 3 54035NEI700 9646004001 1 38.96407 -81.8361 arsenic 3 54035NEI700 9634001050 1 38.92377 -81.791 arsenic 2 54035NEI700 9646004013 3 38.95063 -81.851 arsenic 2 18173NEI32661 305004067 59 37.9132 -87.3113 HF 2 18173NEI32661 305004037 92 37.92372 -87.3059 HF 2 48331NEI6464 9508001145 7 30.5577 -97.0886 HF 2 48331NEI6464 9508001158 7 30.55145 -97.0834 HF 2
1 -- Indicates facility has either ceased operations or have gone bankruptFacility NEI ID HAP HQ > 1 HQ > 5 HQ > 10 HQ > 15

NEI32661 Arsenic cpds 249 249 151 0 NEIOH1110001 1 Arsenic cpds 2082 1315 4 0 NEI42328 Arsenic cpds 1044 1011 13 0 NEI6464 Arsenic cpds 19 14 7 0 NEI39458 Arsenic cpds 5164 90 0 0 NEI700 Arsenic cpds 312 168 0 0 NEI34464 Arsenic cpds 10 5 0 0 NEI46970 1 Arsenic cpds 557 169 0 0 NEI11365 Arsenic cpds 206 0 0 0 NEI41217 Arsenic cpds 1501 0 0 0 Total Population Exposed 11144 3021 175 0

NEI32661 Hydrofluoric acid 59 0 NEIOH1110001 * Hydrofluoric acid 4 0 NEI6464 Hydrofluoric acid 7 0 Total Population Exposed 70 0
1 -- Indicates facility has either ceased operations or have gone bankrupt Population Exposed within 3 km of plant Table 3 - Population Exposure Estimates for Acute Noncancer HQ's greater than 1

Primary Aluminum Reduction Plant Source Category

# Appendix 8: Figures 1

– 10

Acute Non

-cancer GIS Plots for estimated Hazard Quotient (HQ)Values 

# from HEM

-3 for Residential and Maximum Off

-site Receptors for All

Operating Plants exceeding an HQ (REL) > 1

# Figure 1: NEI32661 Refined Acute Analysis

HQ Values

-- Arsenic (REL)

Maximum Off

-site HQ

Maximum Residential HQ

# Figure 2: NEI42328 Refined Acute Analysis

HQ Values

- Arsenic (REL)

Maximum Off

-site HQ 

# Maximum Residential HQ

# Figure 3: NEI6464 Refined Acute Analysis

HQ Values

- Arsenic (REL)

Maximum Residential HQ

Maximum Off

-site HQ

# Figure 4: NEI39458 Refined Acute Analysis

HQ Values

- Arsenic (REL)

Maximum Off

-site HQ

Maximum Residential HQ

# Figure 5: NEI700 Refined Acute Analysis

HQ Values

- Arsenic (REL)

Maximum Off

-site HQ

Maximum Residential HQ 

# Maximum Off

-site HQ

Maximum Residential HQ

# Figure 6: NEI34464 Refined Acute Analysis

HQ Values

- Arsenic (REL)

Maximum Off

-site HQ

Maximum Residential HQ

# Figure 7: NEI11365 Refined Acute Analysis

HQ Values

-- Arsenic (REL)

Maximum Off

-site HQ
Maximum Residential HQ

# Figure 8: NEI41217 Refined Acute Analysis

HQ Values

- Arsenic (REL)

Maximum Off

-site HQ

Maximum Residential HQ

# Figure 9: NEI32661 Refined Acute Analysis

HQ Values

-- HF (REL)

Maximum Off

-site HQ

Maximum Residential HQ

# Figure 10: NEI6464 Refined Acute Analysis

HQ Values

-- HF (REL)