DSHW-2023-208737 - 0901a0688126c008

State of Utah Mail - WZ MNA Confirmation SAP-4th Revision
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WZ MNA Confirmation SAP-4th Revision
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Michele Bay <[e-mail]>Fri, Sep 1, 2023 at 11:12 AM
To: "[e-mail]" <[e-mail]>, Karen Wallner <[e-mail]>
Cc: "Bradford, Kent J" <[e-mail]>, "Dodson, Eric" <[e-mail]>, "Storey, Austin D"
<[e-mail]>, Jeff Bailey <[e-mail]>
Good afternoon,
On behalf of Western Zirconium in Ogden, UT, please find attached the 4th revision of the Western
Zirconium Monitored Natural Attenuation Sampling and Analysis Plan.
Thank you,
~Michele
Michele Bay
Engineer II
406.686.3108 406.498.7867 woodardcurran.com
[e-mail]
1015 S. Montana St. Butte, MT 59701
COMMITMENT & INTEGRITY DRIVE RESULTS
DSHW-2023-208737
9/1/23, 1:43 PM
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9/1/23, 1:43 PM State of Utah Mail - WZ MNA Confirmation SAP-4th Revision
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WZ_MNA Confirmation Soil Sampling SAP_Draft Final_rev 4.zip
8269K

WESTINGHOUSE ELECTRIC COMPANY
Western Zirconium Plant

SOIL SAMPLING AND ANALYSIS PLAN

Monitored Natural Attenuation (MNA)
Confirmation Soil Sampling
Western Zirconium Mud Flats Area

Prepared by: Woodard & Curran

July 13, 2023

2

TABLE OF CONTENTS
SECTION PAGE NO.
1.0 Project Background………………………………………………………………………………. 4
1.1 Sampling Locations…………………………………………………………………………… 4
1.2 Schedule………………………………………………………………………………………. 4
2.0 Sampling Process………………………………………………………………………………… 5
2.1 Field Preparations…………………………………………………………………………….. . 5
2.2 Equipment………………………………………………………………………………………6
2.3 Surficial Soil Sampling Procedure…………………………………………………………….. 6
2.4 Decontamination Procedure…………………………………………………………………… 7
2.5 Quality Assurance/Quality Control Samples………………………………………………….. 7
2.5.1 Temperature Blanks……………………………………………………………………… 7
2.5.2 Equipment/Field Blank……………………………………………………………………7
2.5.3 Blind Duplicates………………………………………………………………………….. 7
2.5.4 Matrix Spike, Matrix Spike Duplicates, and Method Duplicates…………………………8
2.6 Documentation Procedure……………………………………………………………………... 8
2.6.1 Sample Identification and Labeling……………………………………………………….9
3.0 Laboratory Analysis………………………………………………………………………………. 9
3.2 Data Quality…………………………………………………………………………………… 9
4.0 Reporting…………………………………………………………………………………………10
5.0 References………………………………………………………………………………………..11

3

List of Tables
Table 1. Soil Sample Approximate Coordinates
Table 2. Sample Containers, Preservation, and Hold Times
Table 3. Analytical Methods
Table 4. EPA Regional Screening Levels Outdoor Worker and Historic Analytical Results
Table 5. EPA Regional Screening Levels Composite Worker Soil – May 2023

Figure
Figure 1. MNA Soil Sample Locations

Appendix
Appendix A. Soil Sample Log Form
Appendix B. EPA Outdoor Worker Regional Screening Levels Default Values – August 2023
Regional Screening Level (RSL) Composite Worker Soil Table – May 2023

4

Monitored Natural Attenuation Confirmation Soil Sampling

Westinghouse Electric Company
Western Zirconium Plant
10,000 West 900 South
Ogden, UT 84404

1.0 Project Background

The Mud Flats area of the Western Zirconium site is located east of the Plant and evaporation ponds. The
area was historically impacted by seepage of evaporation pond water through earthen berms surrounding
the ponds and/or upwelling of contaminated groundwater from the shallow aquifer affected by pond
seepage. During Phase II of the RFI investigation conducted in 2003, soil samples were collected
throughout the Mud Flats Area to determine baseline concentrations of constituents that may pose a risk to
human health and the environment. These findings are presented in the Western Zirconium Ecological Risk
Assessment (URS, 2008). In 2012 the Western Zirconium Corrective Measures Study (URS, 2012) was
conducted to identify appropriate corrective actions and site management activities, of which are described
in the Western Zirconium Site Management Plan (SMP; Westinghouse, April 2022). During 2012-2013,
one of the resulting corrective actions implemented the development and installation of the impermeable
barrier wall that surrounds the evaporation ponds. The barrier wall is designed to capture and contain
contaminated groundwater beneath the evaporation ponds that historically seeped into groundwater within
the Mud Flats area. Following the completion of the barrier wall (2013), contaminants that remain in
groundwater, surface water, and soils throughout the Mud Flats area are predicted to attenuate over time.
According to the SMP, Western Zirconium shall collect monitored natural attenuation (MNA) confirmation
soil samples from ten specific locations within the Mud Flats area to confirm that natural attenuation has
occurred following 10 years after the installation of the barrier wall.

1.1 Sampling Locations

The Mud Flats area of the Western Zirconium site encompasses approximately 110 undeveloped acres
located north, east, and south of the evaporation ponds. Ten sample locations historically identified as SS-
101 – SS-104 and SS-106 – SS-111 will be sampled for this project, and are located within the vicinity of
the northeast, east, and south perimeters of the evaporation ponds. (See Figure 1. MNA Soil Sample
Locations) The approximate coordinates where samples are to be collected are presented in Table 1.

1.2 Schedule
Soil sample collection from these locations will be conducted during the scheduled 3rd Quarter Evaporation
Pond Area Monitoring event. This event is scheduled to be conducted during the week of August 21st -
August 25, 2023

5

Table 1. Soil Sample Approximate Coordinates

Sample ID Approximate Coordinates
SS-101 41° 15' 58.77" N, 112° 13' 17.58" W
SS-102 41° 15' 57.23" N, 112° 13' 13.40" W
SS-103 41° 15' 53.14" N, 112° 13' 16.27" W
SS-104 41° 15' 48.93" N, 112° 13' 11.32" W
SS-106 41° 15' 40.29" N, 112° 13' 02.54" W
SS-107 41° 15' 35.22" N, 112° 13' 01.15" W
SS-108 41° 15' 21.07" N, 112° 13' 00.65" W
SS-109 41° 15' 16.73" N, 112° 12' 51.26" W
SS-110 41° 15' 17.85" N, 112° 13' 06.81" W
SS-111 41° 15' 19.40" N, 112° 13' 25.44" W

2.0 Sampling Process

The soil sampling process is described in this section. Soil samples will be collected from specific locations
previously sampled during Phase II of the RFI investigation conducted in 2003, before the installation of
the barrier wall that surrounds the evaporation ponds. Analytical data will be used to confirm the natural
attenuation of ammonia as N and arsenic in soil has occurred.

2.1 Field Preparations

The field personnel will ensure that the following activities have been completed prior to mobilizing to the
site:

· Verify with the Project Manager of when the sampling is to be conducted.
· Ensure all field staff conducting the sampling have reviewed the Site-Specific Health
and Safety Plan (SSHASP).
· Ensure that appropriate sample containers have been procured for the required
samples, quality control (QC) sample analyses, and that the analytical laboratory has
been contacted and is prepared to receive the samples.
· Obtain appropriate site maps with planned soil sample locations clearly labeled, if
appropriate.

6

2.2 Equipment
· Personal protective clothing and equipment as required by the Site-Specific Health and
Safety Plan (SSHASP)
· Sample containers and labels
· Sample collection device (stainless steel spoons)
· Stainless steel bowl or pan for sample homogenizing
· Decontamination equipment and supplies
· Field logbook and sample collection forms.
· Insulated cooler and ice.
· Global Positioning System (GPS) device

2.3 Surficial Soil Sampling Procedure

Soil samples will be collected using a sample collection device that is appropriate for the environment and
type of sample required. Sampling will be conducted using hand collection techniques (hand augers,
trowels, spoons, etc.) as required by physical characteristics and location of soil. The following steps will
be followed when collecting soil samples from a depth of 0-2” below the ground surface.

· Obtain GPS coordinates and record all applicable data into the field logbook and
sample forms for each individual location.
· Each field team member will don a new pair of nitrile gloves at each sampling location.
· With a clean, decontaminated stainless steel spoon or trowel, clear the area of any
vegetation and surface debris.
· Using a clean, decontaminated stainless steel spoon or trowel, dig to a depth of two
inches and collect the sample by scraping the inner walls of the hole. Place the sample
aliquot from the individual location (e.g., SS-101) into the stainless-steel mixing
bowl/pan. Homogenize the sample from the location by dividing the material in the
sample pan into quarters. Mix each quarter, then combine two quarters to form halves.
Mix the two halves to complete homogenization.
· Fill the laboratory provided sample container (s).
· Secure sample container caps.
· Label the sample containers.
· Pack samples in a cooler with ice to reduce temperature.
· Properly decontaminate re-usable equipment before collecting samples from the next
location.

7

2.4 Decontamination Procedure

All re-usable sampling equipment that directly contacts any soil will be decontaminated prior to each use,
between each sample location, and at the end of each sampling event. The following procedure will be used:
· Clean equipment thoroughly with a solution of tap water and non-phosphate, laboratory
grade detergent using brushes as necessary,
· Rinse thoroughly with tap water,
· Rinse thoroughly with deionized (DI) or distilled water, and
· Allow equipment to dry.

Between use, equipment will be stored in dedicated cases or a clean plastic bag to prevent contamination
from soil or dust.

2.5 Quality Assurance/Quality Control Samples
QA/QC samples collected will enable data quality evaluation and validation. In general,
QA/QC samples are collected using the same procedures as those used for collecting
environmental samples, with notable exceptions as described in the following subsections.

2.5.1 Temperature Blanks
Temperature blanks consist of a 40 milliliter (mL) glass vial filled with reagent-grade water.
The temperature of this sample is measured at the time the samples are received by the
laboratory. Temperature blanks will be used to assess whether the preservation criterion of 0-
4°C has been met.

2.5.2 Equipment/Field Blank
Field Blanks will be used to help identify contamination from the sampling environment, from
sampling equipment, or from sample handling. A Field Blank (FB) is a sample clean silica
sand and appropriate preservatives prepared in the field. FB is contained in a sample container
randomly chosen from each lot of containers received from the supplier. Field blanks will be
collected by pouring silica sand over decontaminated sampling equipment and then dispensing
the sand into sample containers. The FB sample will be assigned its own sample identification,
but will be sealed, handled, shipped, and analyzed in the same manner as native samples.
Analysis will be identical to native samples. Sample identification and labeling can be found
in Section 2.6.1.

2.5.3 Blind Duplicates
A blind duplicate sample is a second sample collected at the same location and time as the
original sample. Blind duplicate samples are collected simultaneously or in immediate
succession using identical techniques. Blind duplicates will be collected at select locations to
8

provide estimates of the total sampling and analytical precision. At least one duplicate sample
will be analyzed from each group of twenty environmental samples of the same matrix. Blind
duplicate samples will be analyzed for all analyses required for the original sample. The blind
duplicates will be managed and analyzed in the same manner as all environmental samples;
however, the COC forms will not indicate which samples are duplicates. A record of the
duplication will be made on the appropriate sampling log form. Sample identification and
labeling can be found in Section 2.6.1.

2.5.4 Matrix Spike, Matrix Spike Duplicates, and Method Duplicates
Samples submitted for matrix spiking will be collected from locations that are known or
assumed to be relatively free of contamination and can produce a sufficient amount of sample
to easily fill all sample containers. At least one matrix spike and matrix spike duplicate sample
or method duplicate sample will be analyzed from each group of twenty environmental samples
of the same matrix. The MS, MSD, and MD samples will be spiked in the laboratory. The
concentrations and compounds that are used for spike testing will be appropriate for the
Western Zirconium site and are discussed in the WZ QAPP. A record of the MS/MSD
collection will be made on the appropriate sampling log form.

Samples will be properly preserved and will be accompanied by a completed chain-of-custody form in a
custody-sealed cooler. The sample containers, preservation, and hold times are presented below in Table 2.

Table 2. Sample Containers, Preservation, and Hold Times

Analyte Container Preservative Holding Time
(days)
Ammonia 4-oz Glass jar w/Teflon lid 0°C - 4°C 28
Arsenic 4-oz Glass jar w/Teflon lid None 180

2.6 Documentation Procedure

All field entries will be recorded in a bound field logbook with consecutively numbered pages.
Additionally, Soil Sampling Log form will be completed for each individual location sampled. An
example of the Soil Sampling Log form is included in Appendix A. Logbook entries and associated
form will be completed prior to proceeding to the next sample location. Specific entries will
include but are not necessarily limited to the following: sample location (sample ID); sample date
and time; depth at which sample was collected, sample identification number; sample analysis,
sample field preparation, sample preservative, sampling equipment decontamination, weather
conditions, personnel present and affiliation of personnel, and any deviations from the SAP
protocols.
9

2.6.1 Sample Identification and Labeling

Soil samples will be identified by their media type, location ID, and the date of sample collection.
The media type will be identified as SS, the location ID will be the identification number, and the
date will be a two-digit month followed by two-digit day, followed by a two-digit year.
Example Natural Sample: Soil sample collected from location SS-101 on
June 1, 2023, would be designated as SS-101-060123.
Example Duplicate Sample: Duplicate soil sample collected from location SS-101 on
June 1, 2023, would be designated as SS-D1-060123.
Example Field Blank Sample: Field blank sample collected on June 1, 2023, would
be designated as SS-FB1-060123.

3.0 Laboratory Analysis

The collected samples, including QA/QC samples, will be analyzed by Chemtech-Ford Analytical
Laboratory located in Sandy, UT. The samples will be analyzed by the following methods presented in
Table 3.
Table 3. Analytical Methods

3.2 Data Quality

Chemtech-Ford will provide analytical results within a level IV quality control/quality assurance data
package(s). The data package(s) will be validated according to level IV data validation guidelines
specified in the Western Zirconium Quality Assurance Project Plan (QAPP; Westinghouse, 2002) and
by USEPA National Functional Guidelines for Superfund Inorganic Methods Data Review (EPA,
2020). Data assessment procedures will be conducted in accordance with precision, accuracy,
representativeness, comparability, and completeness (PARCC) parameters described in detail in
Section 13.0 of the WZ QAPP. All analytical data will be validated, and all decisions and
recommendations will be based upon validated data.

Analyte Method
Ammonia as N EPA 350.1
Total Arsenic SW846 6010B
10

4.0 Reporting

According to the Western Zirconium Site Management Plan (Westinghouse, April 2022) and
Corrective Measures Study Volume II (November 2012), analytical results for ammonia as N and
total arsenic are predicted to decrease in concentration after ten years. The analytical results will
be evaluated against the EPA Regional Screening Levels for Outdoor Workers calculated using
the RSL Calculator for nitrate (measured as nitrogen) and inorganic arsenic and analytical results
obtained during the 2003 Phase II RCRA Facility Investigation (RFI). (See Table 4. EPA Regional
Screening Levels Outdoor Worker and Historic Analytical Results). Additionally, analytical data
will be compared to the Regional Screening Level Composite Worker Soil Table (May 2023)
summarized in Table 5 for total inorganic arsenic. Supporting documents can be found in
Appendix B. The confirmation soil samples are predicted to confirm that natural attenuation has
occurred following 10 years after the installation of the barrier wall that surrounds the evaporation
ponds. A report detailing sample collection, laboratory analytical results, data validation, and data
assessment will be prepared and submitted to UDWMRC and UDWQ no later than 60 days after
the completion of the sampling event.

Table 4. EPA Regional Screening Levels Outdoor Worker and Historic Analytical Results

Table 5. EPA Regional Screening Levels Composite Worker Soil – May 2023

The data presented was obtained from the EPA Regional Screening Levels Generic Tables.
https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables

Ammonia as N mg/kg Soil NA NA
NA NA NA NA NA NA
Total Arsenic mg/kg Soil 3.6 17 3900 3.0 580 2800 89,000 480
Carcinogenic Target Risk = 1E-06 Noncancer Hazard Index = 1
Analyte Units Media Ingestion
SL
Dermal
SL
Inhalation
SL
Carcinogenic
SL
Injestion
SL
Dermal
SL
Inhalation
SL
Noncarcinogenic
SL
Ammonia as N mg/kg Soil 250 560 5.4 470 2.8 0.82 6100 19 0.97 150
Total Arsenic mg/kg Soil 5.1 7.1 4 8.2 12 8.8 8.1 8.3 4.9 7
*These RSLs were calculated using the default values provided by the EPA RSL Calculator for an Outdoor Worker. Target Risk of 1 x E-
06 and a hazard index equal to 1.0 (August 2023)
MediaUnitsAnalyte
Historic Analytical Results (2003)
SS-101 SS-102 SS-103 SS-104 SS-106 SS-107 SS-108 SS-109
3.33*
2.8 E+06*
SS-110 SS-111
EPA Outdoor
Worker RSL
11

5.0 References

EPA, 2002. USEPA RCRA Waste Sampling Draft Technical Guidance. Planning, Implementation,
and Assessment. August 2002.

EPA, 2010. USEPA Contract Laboratory Program National Functional Guidelines for Inorganic
Superfund Methods Data Review. Office of Emergency and Remedial Response, Washington,
D.C. EPA-540-R-10-011. January 2010.

URS, 2003b. Phase II RCRA Facility Investigation Work Plan for Pond Solid Waste Management
Units and Area of Concern Lowlands East of the Plant. May 2003.

URS, 2004b. Phase II RCRA Facility Investigation Report for Pond Solid Waste Management Units
and Area of Concern Lowlands East of the Plant. August 2004.

URS, 2004c. Human Health Risk Assessment Criteria, Western Zirconium Evaporation Ponds Area.
October 2004.

URS, 2007. URS Corporation. Human Health Risk Assessment Western Zirconium Evaporation
Ponds Area. Prepared for Westinghouse Electric Company, LLC. June 2007.

URS, 2008. URS Corporation. Final Ecological Risk Assessment. Prepared for Westinghouse Electric
Company, LLC. January 2008.

URS, 2010. Western Zirconium Plant Corrective Measures Study. Prepared for Westinghouse Electric
Company, LLC. April 2010.
Westinghouse, 2002. Westinghouse Electric Company Western Zirconium Plant Western Zirconium
Quality Assurance Project Plan (QAPP). November 2002.

Westinghouse, 2018. Evaporation Pond Area Ongoing Monitoring Plan. August 2018.

Westinghouse, 2018. Groundwater Quality Discharge Permit UGW570002, Statement of Basis. 2018

Westinghouse, 2022. Site Management Plan. April 2022

12

FIGURE

13

15

APPENDIX A

Soil Sampling Log

16

17

APPENDIX B
EPA Outdoor Worker Regional Screening Levels Default Values – August 2023
EPA Regional Screening Level (RSL) Composite Worker Soil Table – May 2023
Output generated 28AUG2023:11:37:04
Site-specific 1
Outdoor Worker Soil Inputs
Variable
Outdoor
Worker
Soil
Default
Value
Site-Specific
Value
A (PEF Dispersion Constant)16.2302 16.2302
A (VF Dispersion Constant)11.911 11.911
A (VF Dispersion Constant - mass limit)11.911 11.911
B (PEF Dispersion Constant)18.7762 18.7762
B (VF Dispersion Constant)18.4385 18.4385
B (VF Dispersion Constant - mass limit)18.4385 18.4385
City (PEF Climate Zone) Selection Default Default
City (VF Climate Zone) Selection Default Default
C (PEF Dispersion Constant)216.108 216.108
C (VF Dispersion Constant)209.7845 209.7845
C (VF Dispersion Constant - mass limit)209.7845 209.7845
foc (fraction organic carbon in soil) g/g 0.006 0.006
F(x) (function dependent on U m/Ut) unitless 0.194 0.194
n (total soil porosity) L pore /L soil 0.43396 0.43396
pb (dry soil bulk density) g/cm 3 1.5 1.5
pb (dry soil bulk density - mass limit) g/cm 3 1.5 1.5
PEF (particulate emission factor) m 3/kg 1359344438 1359344438
ps (soil particle density) g/cm 3 2.65 2.65
Q/Cwind (g/m2-s per kg/m 3)93.77 93.77
Q/Cvol (g/m2-s per kg/m 3)68.18 68.18
Q/Cvol (g/m2-s per kg/m 3 - mass limit)68.18 68.18
As (PEF acres)0.5 0.5
As (VF acres)0.5 0.5
As (VF mass-limit acres)0.5 0.5
AFout (skin adherence factor - outdoor worker) mg/cm 2 0.12 0.12
ATout (averaging time - outdoor worker)365 365
BW out (body weight - outdoor worker)80 80
EDout (exposure duration - outdoor worker) yr 25 25
EFout (exposure frequency - outdoor worker) day/yr 225 225
ETout (exposure time - outdoor worker) hr 8 8
Output generated 28AUG2023:11:37:04
Site-specific 2
Outdoor Worker Soil Inputs
Variable
Outdoor
Worker
Soil
Default
Value
Site-Specific
Value
THQ (target hazard quotient) unitless 0.1 1
IRSout (soil ingestion rate - outdoor worker) mg/day 100 100
LT (lifetime) yr 70 70
SAout (surface area - outdoor worker) cm 2/day 3527 3527
TR (target cancer risk) unitless 1.0E-06 1.0E-06
Tw (groundwater temperature) Celsius 25 25
Theta a (air-filled soil porosity) L air/L soil 0.28396 0.28396
Theta w (water-filled soil porosity) L water /L soil 0.15 0.15
T (exposure interval) s 819936000 819936000
T (exposure interval) yr 26 26
Um (mean annual wind speed) m/s 4.69 4.69
Ut (equivalent threshold value)11.32 11.32
V (fraction of vegetative cover) unitless 0.5 0.5
Output generated 28AUG2023:11:37:04
Site-specific 3
Outdoor Worker Risk-Based Regional Screening Levels (RSL) for Soil
Key: I = IRIS; P = PPRTV; O = OPP; A = ATSDR; C = Cal EPA; X = PPRTV Screening Level; H = HEAST; D = OW; W = TEF applied; E = RPF applied; G = see
user guide; U = user provided; ca = cancer; nc = noncancer; * = where: nc SL < 100X ca SL; ** = where nc SL < 10X ca SL; SSL values are based on DAF=1;
max = ceiling limit exceeded; sat = Csat exceeded.
Chemical
CAS
Number Mutagen?Volatile?
Chemical
Type
SFo(mg/kg-day)-1
SFoRef
IUR
(ug/m 3)-1
IUR
Ref
RfD
(mg/kg-day)
RfD
Ref
RfC
(mg/m 3)
RfC
Ref GIABS ABS RBA
Soil
Saturation
Concentration
(mg/kg)
Arsenic, Inorganic 7440-38-2 No No Inorganics 1.50E+00 I 4.30E-03 I 3.00E-04 I 1.50E-05 C 1 0.03 0.6 -
Nitrate (measured
as nitrogen)
14797-55-8 No No Inorganics --1.60E+00 I -1 -1 -
S
(mg/L)
Koc\
(cm 3/g)
Kd\
(cm 3/g)
HLC
(atm-m 3/mole)
Henry's
Law
Constant
Used in
Calcs
(unitless)
H`
and
HLC
Ref
Normal
Boiling
Point
BP
(K)
BP
Ref
Critical
Temperature
TC\
(K)
TC\
Ref
Chemical
Type
Dia\
(cm 2/s)
Diw \
(cm 2/s)
DA\
(cm 2/s)
Particulate
Emission
Factor
(m 3/kg)
--2.90E+01 --888.15 PHYSPROP 1673 CRC INORGANIC ---1.36E+09
-------INORGANIC ---1.36E+09
Volatilization
Factor
Unlimited
Reservoir
(m 3/kg)
Volatilization
Factor
Mass Limit
(m 3/kg)
Volatilization
Factor
Selected
(m 3/kg)
Ingestion
SL
TR=1E-06
(mg/kg)
Dermal
SL
TR=1E-06
(mg/kg)
Inhalation
SL
TR=1E-06
(mg/kg)
Carcinogenic
SL
TR=1E-06
(mg/kg)
Ingestion
SL
THQ=1
(mg/kg)
Dermal
SL
THQ=1
(mg/kg)
Inhalation
SL
THQ=1
(mg/kg)
Noncarcinogenic
SL
THI=1
(mg/kg)
Screening
Level
(mg/kg)
---4.04E+00 1.91E+01 4.31E+03 3.33E+00 6.49E+02 3.07E+03 9.92E+04 5.33E+02 3.33E+00 ca
-------2.08E+06 --2.08E+06 2.08E+06 nc
max
Output generated 28AUG2023:11:37:04
Site-specific 4
Outdoor Worker Risk for Soil
Chemical
SFo(mg/kg-day)-1
SFoRef
IUR
(ug/m 3)-1
IUR
Ref
RfD
(mg/kg-day)
RfD
Ref
RfC
(mg/m 3)
RfC
Ref GIABS ABS RBA
Soil
Saturation
Concentration
(mg/kg)
S
(mg/L)
Koc\
(cm 3/g)
Kd\
(cm 3/g)
Arsenic, Inorganic 1.50E+00 I 4.30E-03 I 3.00E-04 I 1.50E-05 C 1 0.03 0.6 ---2.90E+01
Nitrate (measured as nitrogen)--1.60E+00 I -1 -1 ----
*Total Risk/HI -----------
HLC
(atm-m 3/mole)
Henry's
Law
Constant
Used in
Calcs
(unitless)
H`
and
HLC
Ref
Normal
Boiling
Point
BP
(K)
BP
Ref
Critical
Temperature
TC\
(K)
TC\
Ref
Chemical
Type
Dia\
(cm 2/s)
Diw \
(cm 2/s)
DA\
(cm 2/s)
Particulate
Emission
Factor
(m 3/kg)
Volatilization
Factor
Unlimited
Reservoir
(m 3/kg)
--888.15 PHYSPROP 1673 CRC INORGANIC ---1.36E+09 -
----INORGANIC ---1.36E+09 -
---------
Volatilization
Factor
Mass Limit
(m 3/kg)
Volatilization
Factor
Selected
(m 3/kg)
Concentration
(mg/kg)
Ingestion
Risk
Dermal
Risk
Inhalation
Risk
Carcinogenic
Risk
Ingestion
HQ
Dermal
HQ
Inhalation
HQ
Noncarcinogenic
HI
-----------
-----------
-----------
Output generated 28AUG2023:11:37:04
Inhalation Unit Risk Toxicity Metadata 5
Chemical
CAS
Number
Chemical
Type
IUR
(ug/m 3)-1
Toxicity
Source
EPA Cancer
Classification
IUR
Tumor
Type
IUR
Target
Organ
IUR
Species IUR Method
IUR
Route
IUR
Treatment
Duration IUR Study Reference
IUR
Notes
Arsenic,
Inorganic
7440-38-2 Inorganics 0.0043 IRIS A Cancer Lung Human Absolute-risk
linear model
NA NA Brown and Chu 1983a,b,c,
Lee-Feldstein 1983, Higgins
1982, Enterline and Marsh
1982
NA
Nitrate
(measured
as nitrogen)
14797-55-8 Inorganics -
Output generated 28AUG2023:11:37:04
Oral Slope Factor Toxicity Metadata 6
Chemical
CAS
Number
Chemical
Type
SFo(mg/kg-day)-1
Toxicity
Source
EPA Cancer
Classification
SFoTumor
Type
SFoTarget
Organ
SFoSpecies SFo Method
SFoRoute
SFoTreatment
Duration
SFo Study
Reference
SFoNotes
Arsenic,
Inorganic
7440-38-2 Inorganics 1.5 IRIS A Skin
cancer
Skin Human Time- and dose-related
formulation of the
multistage model
NA NA Tseng, 1977,
Tseng et al.,
1968
NA
Nitrate
(measured
as nitrogen)
14797-55-8 Inorganics -
Output generated 28AUG2023:11:37:04
Oral Chronic Toxicity Metadata 7
Chemical
CAS
Number
Chemical
Type
Chronic
RfD
(mg/kg-day)
Toxicity
Source
Chronic
RfD Basis
Chronic
RfD
Confidence
Level Chronic RfD Critical Effect
Chronic
RfD
Target
Organ
Chronic
RfD
Modifying
Factor
Chronic
RfD
Uncertainty
Factor
Chronic
RfD
Species
Arsenic,
Inorganic
7440-38-2 Inorganics 0.0003 IRIS NOAEL:
0.0008
mg/kg-day
Medium Hyperpigmentation, keratosis and
possible vascular complications
Skin and
blood
1 3 Human
Nitrate
(measured
as nitrogen)
14797-55-8 Inorganics 1.6 IRIS NOAEL: 1.6
mg/kg-day
High Early clinical signs of
methemoglobinemia in excess of
10% (0-3 months old infants
formula)
Blood 1 1 Human
Chronic
RfD
Route
Chronic
RfD
Study
Duration
Chronic RfD
Study
Reference
Chronic
RfD
Notes
NA NA Tseng, 1977,
Tseng et al.,
1968
NA
NA NA Bosch et al.
1950,
Watson 1951
NA
Output generated 28AUG2023:11:37:04
Inhalation Chronic Toxicity Metadata 8
Chemical
CAS
Number
Chemical
Type
Chronic
RfC
(mg/m 3)
Toxicity
Source
Chronic
RfC
Basis
Chronic
RfC
Confidence
Level
Chronic
RfC
Critical
Effect
Arsenic, Inorganic 7440-38-2 Inorganics 0.000015 CALEPA NA NA NA
Nitrate (measured as nitrogen)14797-55-8 Inorganics -
Chronic
RfC
Target
Organ
Chronic
RfC
Modifying
Factor
Chronic
RfC
Uncertainty
Factor
Chronic
RfC
Species
Chronic
RfC
Route
Chronic
RfC
Study
Duration
Chronic
RfC Study
Reference
Chronic
RfC
Notes
NA NA NA NA NA NA NA NA