Appendix 6

Acute Impacts Refined Analysis Figures 
Refined Acute Modeling Approach 

 Initial acute screening risk calculations were performed with the HEM-3 model. 

HEM-3 estimates acute (1-hour) impacts at both polar and census block receptors. 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 

also 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. 

 This appendix includes the results of refined acute assessments performed for 

facilities that exceeded short-term health benchmarks using the HEM-3 approach. The 

refinements can address both areas of conservatism described above. The simplest 

refinement is to plot the HEM-3 polar grid results 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 public buildings.). In cases where this refinement results in lower acute 

risks no further refinement was conducted. The attached figures present the estimated 

hazard quotient values (the modeled 1-hour concentration of a pollutant divided by its 

short-term health benchmark) at the polar receptors near the facilities. Each set of figures 

is prefaced with a description of the maximum off-site hazard quotient value and where 

that value occurs. Refer to below for a brief summary; 

PEPOs Source Category:

• 54039NEIWV0390005*

; maximum offsite acute HQ(REL) for glycol ethers of 6 to 

the north of the facility on 1st Avenue South 

• 22089NEILA13809*; maximum offsite acute HQ(REL) for acrolein of 4, southeast 

of the facility. Acute MIR for the source category. 

• 48245NEI12483; maximum offsite acute HQ(REL) chlorine of 2, southeast of the 

facility on Hogaboom Road and north of the facility on Hwy 366. 
PR4ABS Source Category:

 26111NEI11906; maximum offsite acute HQ(REL) for acetaldehyde of 2; east of 

facility on South Sagnaw Road. 

PAI Source Category:

• 54039NEIWV0390007; maximum offsite acute HQ(REL) for arsenic compounds of 

80; intersection of 1st Avenue South and Goff Mountain Road. 

• 01097NEI8596 

*

; maximum offsite acute HQ (REL) for phosgene of 4; southwest 

of the plant on Roger Phillips Road. 

• 54039NEIWV0390007; maximum offsite acute HQ(REL) for ethylene glycol ethyl 

ether of 8; to the west of facility on 1st Avenue South Road. 

• 54039NEIWV0390007; maximum offsite acute HQ(REL) for acrolein of 4; 

intersection of 1st Avenue South and Goff Mountain Road. 

• 54039NEIWV0390007; maximum offsite acute HQ(REL) for nickel compounds of 

2; intersection of 1st Avenue South and Goff Mountain Road. 

• 26111NEI11906; chloroform acute HQ(REL) less than or equal to 2, north of the 

facility 

• 48201NEI7211; maximum offsite acute HQ(REL) for chlorine of 2 to the southeast 

of facility 

• 19139NEI12233; maximum offsite acute HQ(REL) for formaldehyde of 2; south of 

facility 

PR4PET Source Category:

• 45063NEI41393 

*

; maximum offsite acute HQ(REL) for acetaldehyde of 8 and a 

HQ(ERPG-1) of 1, southeast of the facility 

• 45031NEI43310; maximum offsite HQ(REL) acetaldehyde of 20, south of the 

facility 

• 54053NEI43309 

*

; maximum offsite acute HQ(REL) for acetaldehyde of 6 to the 

southeast of facility 

• 47037NEI45591; maximum offsite acute HQ(REL) acetaldehyde of 7, southwest of 

the facility on Old Hickory blvd. 

• 45041NEI41302; maximum offsite acute HQ(REL) for acetaldehyde of 6 to the 

north of the facility on East Palmetto Street 

• 45015NEI2SC00089; maximum offsite acute HQ(REL) for acetaldehyde of 3 to the 

south of facility on Cypress Gardens Road 

• 01103NEI8510; maximum offsite acute HQ(REL) for acetaldehyde of 3 to the north 

of the facility 

• 45083NEI41468; maximum offsite acute HQ(REL) for acetaldehyde of 3 to the 

west of facility 

• 45045NEISC120000; maximum offsite acute HQ(REL) for acetaldehyde of 3; west 

of facility 

*-- Denotes facilities that utilized an acute multiplier =2 vs 10 
Chemical Sector Facilities - PEP

(Refined Acute Risk Assessmen(Refined Acute Risk Assessmen

• Figure 1– 54039NEIWV0390005

*

; maximu

offsite acute HQ(REL) offsite acute HQ(REL) for glycol ethers of 6 

for glycol ethers of

6 

north of the facility on 1st Avenue South

• Figure 2 – 22089NEILA13809

*

; maximum 

acut HQ e(REL) f l i f 4 th t 

for acrolein o

f

4, southeas

t o

facility. Acute MIR for the source category

• Fi

gure 3 

– 48245NEI12483; maximum offs

acute HQ(REL) chlorine of 2, southeast of th

on Hogaboom Road and north of the facili

Hwy 366. Hwy 366.

* (Denotes facilities that utilized an acute hourly multiplier = 2 
Chemical Sector Facilities – PR4

(Refined Acute Risk Assessmen(Refined Acute Risk Assessmen

• Fi

gure 4 

–26111NEI11906; maximum offs

HQ(REL) for acetaldehyde of 2; east of facil

South Sagnaw Road.
Chemical Sector Facilities – PA

(Refined Acute Risk Assessmen(Refined Acute Risk Assessmen

• Figure 5 – 54039NEIWV0390007; maximu

offsite acute H

Q(REL) for arsenic com

pound

80; intersection of 1st Avenue South and G

Mountain Road.

• Figure 6 01097NEI8596

*

• Figure

6

– 01097NEI8596 ; maximum offs

maximum offs

acute HQ (REL) for phosgene of 4; southwes

the plant on Roger Phillips Road.

• Figure 7 

– 54039NEIWV0390007; maximu

offsite acute HQ(REL) for ethylene glycol eth

ether of 8; to the west of facility on 1 ether of 8; to the west of facility on

1st Aven

South Road.

• Figure 8 – 54039NEIWV0390007; maximu

offsite acute HQ offsite acute HQ(REL) for acrolein of 4; inters

for acrolein of 4; inters

of 1st Avenue South and Goff Mountain Ro

* (Denotes facilities that utilized an acute hourly multiplier = 
Chemical Sector Facilities – PA

(Refined Acute Risk Assessmen(Refined Acute Risk Assessmen

• Fi

gure 9 

– 54039NEIWV0390007; maximu

offsite acute HQ(REL) for nickel compounds 

intersection of 1st Avenue South and Goff 

Mountain Road.

• Figure 10 – 26111NEI11906; chloroform a

HQ(REL) less than or equal to 2, north of the 

• Fi 11 gure 11 - 48201NEI7211 i ff 

48201NEI7211; maximum off

s

HQ(REL) for chlorine of 2 to the southeast o

• Figu er

e 12 - 1

9 39 33; a u o 

139NEI12233; m

axim

um 

off

acute HQ(REL) for formaldehyde of 2; south 

facility
Chemical Sector Facilities – PR4P

(Refined Acute Risk Assessment (Refined Acute Risk Assessment

• Figure 13 – 45063NEI41393 

*; maximum o

acute HQ acute HQ(REL) for acetaldehyde of 8 for acetaldehyde of

8.

• Figure 14 - 45031NEI43310; maximum offs

HQ(REL) acetaldeh

y 

de of 20, south of the fa

• Figure 15 – 54053NEI43309 

*; maximum o

acute HQ(REL) for acetaldehyde of 6 to the southeast of facility southeast of facility

• Figure 16 -- 47037NEI45591; not part of th

source category, maximum offsite acute H

acetaldeh de less than 1 after adj stment acetaldeh

yde less than

1 after adj

ustment 

emissions inventory 

* (Denotes facilities that utilized an acute hourly multiplier = 2 
Chemical Sector Facilities 

– PR4

( 

Refined Acute Risk Assessmen

• Figure 17 – 45041NEI41302; maximum off

acute HQ(REL) for acetaldehyde of 6 to the 

h f ili E P l S ( )

t

he 

facility on 

East 

P

almetto 

Street

• Figure 18 - 45015NEI2SC00089; maximum 

acute HQ(REL) acute HQ for acetaldehyde of 3 to the s

for acetaldehyde of

3 to the s

facility on Cypress Gardens Road

• Figure 19 – 01103NEI8510; maximum offs

HQ(REL) for acetaldehyde of 3 to the north o

for acetaldehyde of

3 to the north o

facility

• Fi

gure 20 -- 45083NEI41468; maximum of

acute HQ(REL) for acetaldehyde of 3 to the w

facility
Chemical Sector Facilities – PR4

(Refined Acute Risk Assessmen(Refined Acute Risk Assessmen

• Fi

gure 21 

– 45045NEISC120000; maximu

acute HQ(REL) for acetaldehyde of 3; west 
Chemical Sector Facilities – PR4

(Refined Acute Risk Assessmen(Refined Acute Risk Assessmen

• Figure 22 – 01097NEI43296; maximum of

acute HQ(ERPG-1) for ethyl acrylate of 9; nor

facility
Figure 1 – 54039NEIWV0390005* Acute Glycol ethers HQ 
Figure 2 – 22089NEILA13809* Acute Acrolein HQ (REL)
Figure 3 – 48245NEI12483 Acute Chlorine HQ (REL)
Figure 4 – 26111NEI11906 Acute Acetaldehyde HQ (RE
Figure 5 – 54039NEIWV0390007 Acute Arsenic Compounds H
Figure 6 – 01097NEI8596 Acute Phosgene HQ (REL)
Figure 7 – 54039NEIWV0390007 Acute Ethylene glycol ethyl ethe
Figure 8 – 54039NEIWV0390007 Acute Acrolein HQ (REL)
Figure 9 – 54039NEIWV0390007 Acute Nickel Compounds HQ (
Figure 10 – 26111NEI11906 Acute Chloroform HQ (REL
Figure 11 – 48201NEI7211 Acute Chlorine HQ (REL)
Figure 12 – 19139NEI12233 Acute Formaldehyde HQ (R
Figure 13 – 45063NEI41393 Acute Acetaldehyde HQ (R
Figure 14 – 45031NEI43310 Acute Acetaldehyde HQ (R
Figure 15 – 54053NEI43309 Acute Acetaldehyde HQ (R
Figure 16 – 47037NEI45591 Acute Acetaldehyde HQ (R
Figure 17 – 45041NEI41302 Acute Acetaldehyde HQ (R
Figure 18 – 45015NEI2SC00089 Acute Acetaldehyde HQ 
Figure 19 – 01103NEI8510 Acute Acetaldehyde HQ (RE
Figure 20– 45083NEI41468 Acute Acetaldehyde HQ (RE
Figure 21 – 45045NEISC120000 Acute Acetaldehyde HQ (
Figure 22 –01097NEI43296 Acute Ethyl Acrylate HQ (ERPG