6/26/09 Page of

INITIAL REVIEW EXPOSU RE REPORT (IRExR)

Chemical ID: P090417 Reviewer: Delpire

Results Table: Dose, Concentration, and Days Exceeded Results Summary

Exposure Scenario 1 Water Landfill Stack Air Fugitive Air Drinking Water Fish Ingestion

ADR LADD ADR LADD 7Q10 4 CC=NA PDM Days Exceeded LADD ADR LADD ADR LADD Release activity(ies) 2 ; exposure calculation(s) 3 mg/kg/day mg/kg/day mg/kg/day mg/kg/day μ g/l # Days mg/kg/day mg/kg/day mg/kg/day mg/kg/day mg/kg/day max ADR, LADD --- --- --- --- --- --- 2.94E-06 4.95E-05 2.71E-06 --- ---
1 Exposure scenario titles consist of release activ ity followed by exposure calculation abbreviation.
2 Release activities are from engineering report's Manufactur ing (Mfg), Processing (Proc) and Use release activity labels. Multiple release activities are combined in one exposure scenario if their releases occur at same location.
3 Exposure calculations are Acute Dose Rate (ADR), Lifetime Average Daily Dose (LADD), and Probabilistic Dilution Model (PDM). There may be one, two, or all three exposure calculations per exposure scenario. CC is the aquatic concentration of concern.
4 This column displays concentration values for the 7Q10 streamflow, which is defined as the average streamflow of the 7 consecutive days of lowest flow within a 10 year period.

Remarks:

Fate test recommendations?: (default is NA)6/26/09 Page of

INITIAL REVIEW EXPOSURE REPORT

Chemical ID: P090417 Assessor: Delpire

ENVIRONMENTAL RELEASES

Scenario#:1 Number of Release Sites: Release Activity: max ADR, LADD
Release Description: WATER LANDFILL Non-sludge/Sludge STACK FUGITIVE

Total Releases:
(kg/yr) (kg/yr) (kg/yr) (kg/yr)

Non-sludge/Sludge
Release Days/yr:

Per Site Release:
(kg/site/day) (kg/site/day) (kg/site/day) (kg/site/day)

Remarks:6/26/09 Page of

INITIAL EXPOSURE REVIEW REPORT Chemical ID: P090417

DRINKING WATER EXPOSURE ESTIMATES FROM LANDFILL RELEASES

SCENARIO #: 1 ACTIVITY: max ADR, LADD

RELEASE DESCRIPTION:

EXPOSED POPULATION: Adult

NUMBER OF SITES NON-SLUDGE LANDFILL RELEASE AND DAYS OF RELEASE (kg/site/day)/(days) LANDFILLED SLUDGE 1
AND DAYS OF RELEASE (kg/site/day)/(days) MIGRATION DESCRIPTOR 2 ADSORPTION TO WASTEWATER SLUDGE (%) DRINKING WATER TREATMENT (%)

1 Landfilled sludge equals the fraction adsorbed to wastewater treatment sludge times the surface water pre-treatment release.

2 Migration Descriptor Log Koc Groundwater Concentration (GWC) (mg/L per kg release) Negligible no migration None Negligible to slow > 4.5 3.21E-6 Slow <4.5 to 3.5 2.67E-5 Moderate <3.5 to 2.5 5.95E-5 Rapid <2.5 7.55E-5

ASSUMPTIONS Exposure Units Results ED (years) AT (years) BW (kg) IR (L/day)
Cancer
LADD pot (mg/kg/day) 2.94E-06 30.00 75.00 71.80 1.40
LADC pot (mg/L) 1.51E-04 30.00 75.00 NA NA

REMARKS:6/26/09 Page of

INITIAL EXPOSURE REVIEW REPORT Chemical ID: P090417

INHALATION EXPOSURE ESTIMATES (POST-TREATMENT)

SCENARIO #: 1 RELEASE ACTI VITY max ADR, LADD

RELEASE DESCRIPTION:

METHOD OF CALCULATION: Screen3

EXPOSED POPULATION: Adult

Number of Sites:
Per Site Fugitive Release: NA kg/site/day
Fugitive Release Days per Year: NA days
% Removal via Fugitive Release: 0.00 %
Total Fugitive Release: NA kg/yr
Max Annual Average Air Concentration (Fugitive): 0.00 μg/m 3

Max 24 Hour Average Air Concentration(Fugitive): 0.00 μg/m 3

Per Site Stack Release: kg/site/day
Stack Release Days per Year: days

% Removal via Stack Release: %

Total Stack Release: kg/yr
Max Annual Average Air Concen tration (Stack): 3.69E-02 μg/m 3

Max 24 Hour Average Air Concentration (Stack): 0.27 μg/m 3

ASSUMPTIONS
Exposure Units Results (Stack) Results (Fugitive) ED (years) AT (years) BW (kg) Inh. Rate (m 3 /hr)

Cancer

LADD pot (mg/kg/day) 2.71E-06 N/A 30.00 75.00 71.80 0.55

LADC pot (mg/m 3 ) 1.48E-05 N/A 30.00 75.00 NA NA

Acute

ADR pot

(mg/kg/day) 4.95E-05 N/A NA 1 day 71.80 0.55

Inhalation Comments:6/26/09 Page of

Stack Parameter Data Fugitive Parameter Data Stack Height 10.00 m Release Height: N/A

Inside Stack Diameter: 0.10 m Length of Release Opening: N/A

Stack Gas Exit Velocity: 0.10 m/sec Width of Release Opening: N/A

Stack Gas Temperature: 293.00 K

Meteorological and Terrain Information:

Surrounding Land Use: Rural
Terrain Height: 0.00 m

Distance to Residence of Interest: 100.00 m
Meteorological Class: Full
Stability Class: NA
Wind Speed: NA

Downwash Information:

Facility Length: NA m
Facility Width: NA m
Facility Height: NA m6/26/09 Page of



## LEGEND FOR NEW CHEMICAL S EXPOSURE REPORT

This new chemicals exposure report wa s prepared by the Exposure Assessment Branch (EAB) of the Economics, Exposure and Technology Division, Office of Pollution Prevention and Toxics, USEPA.

The goals of these reports are to calcula te conservative (protective) estimates of exposure endpoints for consumers, the general population, and the environment.

For each exposure scenario to industrial releases, the following three endpoints are calculated: (1) maximum possible acute concentrations and doses (2) maximum possible chronic concentrations and doses (3) for water releases ≥ 20 days, the probability of exceedence of the aquatic concentration of concern These endpoints are identified by abbreviati ons on the Release Activity line, e.g., (1) max ADR , (2) max LADD , (3) max PDM . Depending on the release inputs, these e ndpoints may be calculated and presented on the same page or different pages. That is, a release activity ID of mfg; max ADR, max PDM, max LADD indicates that all the exposure endpoints were cal culated from common manufacturing release values; conversely, a release activity ID of mfg &proc; max ADR indicates that only the maximum acute exposure values were calculated for manufacturing and proce ssing releases that occurred at the same site.

For each consumer product use exposure scenario, whether exposure is to the user directly or to the general population/environment, the maximum exposure values are calculated and presented together.

In addition to the exposure values above, EPA policy dir ects that exposure and release values be compared to criteria threshold values for Exposure-based and PBT Exposure-based cases.

Exposure-based (YX) cases (those with ≥ 100,000 kg/yr production volume) Criteria are exceeded under the following conditions: Presence in consumer product with likely exposure ≥ 3E-3 mg/kg/d exposure via air, fish ingestion or drinking water ≥ 10,000 kg/yr release to environment (post-treatment) ≥ 1,000 kg/yr release to water (post-treatment)

Persistent, Bioaccumulative, Toxic (PBT) chemical s of P2B2 rating or hi gher and production volume ≥ 20,000 kg/yr Criteria are exceeded as for YX cases, with the following differences: ≥ 2,000 kg/yr release to environment (post-treatment) ≥ 200 kg/yr release to water (post-treatment)

Bolding rules in the Report: Values for endpoints above th at are also health or eco concerns are bolded.