Appendix 7 Acute Impacts Refined Analysis FiguresRefined 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, t he 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 overestimati ng exposures

.

The screening approach used by HEM

- 3 to estimate maximum 1

- hour exposures also likely overestimate s . To estimate maximum 1

- hour concentrations at each re ceptor, 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 assum es that t he maximum impact from each source at each receptor occurs at the same time. In actuality

, maximum impacts from different sources may occur at differe nt times.

This appendix addresses refinements to determine the maximum offsite values by plot ting the HEM

- 3 polar grid results on aerial photographs of the facilities

. Th ese photograp h s were examined to determine off

- site locations that may be accessi ble to the public ( e.g., roadways and public buildings.). The attached f igures present the estimate d hazard quotient values (the modeled 1

- hour concentration of a pollutant divided by its short

- term health benchmark) at the polar receptors near the facil ities.

# Mineral Wool Production Mineral Wool Production

• Figure 1 - NEI32636 ; maximum offsite acute HQ for formaldehye of 20 to the north of the facility 20 to the north of the facility

## Figure 1 - NEI32636 Acute Formaldehyde HQ (REL)

# Wool Fiberglass Man fact ring Man u fact u ring

• Figure 2- NEI32855 ; maximum offsite acute HQ for formaldehye of 30 (REL) to acute HQ for formaldehye of 30 (REL) to the northeast of the facility • Figure 3- NEI120375 ; maximum offsite acute HQ for formaldehye of 11 to the acute HQ for formaldehye of 11 to the northwest of the facility • Figure 4 – NEI11393; maximum offsite acute HQ for formaldehye of 6 to the acute HQ for formaldehye of 6 to the north of the facility • Figure 5 – NEIGA1210021; maximum ff it t HQ f f ld h f 3 t o ff s it e acu t e HQ f or f orma ld e h ye o f 3 t o the north and east of the facility • Figure 6 – NEI11202; maximum offsite t HQ f f ld h f 3 t th acu t e HQ f or f orma ld e h ye o f 3 t o th e south and west of the facility • Figure 7 NEI11431; maximum offsite acute HQ for formaldehye of 3 to the nprth and west of the facility

## Figure 2 – NEI32855 Acute Formaldehyde HQ (REL)

## Figure 3 – NEI12037 Acute Formaldehyde HQ (REL)

## Figure 4 – NEI11393 Acute Formaldehyde HQ (REL)

## Figure 5 – NEIGA1210021 Acute Formaldehyde HQ (REL)

## Figure 6 – NEI11202 Acute Formaldehyde HQ (REL)

## Figure 7 – NEI11431Acute Formaldehyde HQ (REL)