ML24214A054

Enclosure 11: ENG-OCS-008 Revision: 0, Derived Concentration Guideline Levels Values for Soil – Industrial Use Scenario Oyster Creek, July 26, 2023

ML24214A054
Person / Time
Site:	Oyster Creek
Issue date:	07/26/2023
From:	Bisson J BHI Energy, Holtec Decommissioning International, Westinghouse
To:	Office of Nuclear Reactor Regulation
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References
HDI-OC-24-018 ENG-OCS-008, Rev 0
Download: ML24214A054 (1)

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ENGINEERING CALCULATION Derived Concentration Guideline Levels Values for Soil - Industrial Use Scenario Oyster Creek Station ENG-OCS-008 Revision: 0 July 26, 2023 Prepared by:

BHI Energy 97 Libbey Industrial Pkwy Weymouth, MA Prepared by Approved by

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 1 of 18 1.0 PURPOSE The purpose of this calculation is to develop derived concentration guideline levels (DCGLs) values for assessing soil at the Oyster Creek Station (OCS) site.

2.0 APPLICABILITY This calculation addresses only the development of DCGLs for soil in open land areas at the OCS site.

3.0 REFERENCES

3.1 BHI Energy Engineering Procedure ENG-AP-02, Verification of Software Operability 3.2 ANL/EAD-4, Users Manual for RESRAD Version 6, U.S. Department of Energy - Argonne National Laboratory, July 2001 3.3 ANL/EVS/TM-18/1, RESRAD-Onsite 7.2 Users Guide, April 2018 3.4 ENG-OCS-007, RESRAD-Onsite Probabilistic Analysis - Industrial Use Scenario, July 2023 3.5 NUREG/CR-5512, Residual Radioactive Contamination from Decommissioning Volume 1: Technical Basis for Translating Contamination Levels to Annual Total Effective Dose Equivalent, Oct. 1992 (PNL-7994)

Volume 3: Parameter Analysis, Draft Report for Comment, Oct. 1999 (SAND99-2148) 3.6 Radionuclide Selection for DCGL Development-Oyster Creek Station Site Characterization Project, January 2022 4.0 DISCUSSION The operability of the RESRAD-Onsite 7.2 computer code was verified on each computer used for code executions in accordance with BHI Energy Engineering procedure ENG-AP-02, Verification of Software Operability [3.1]. The RESRAD code has undergone extensive review, benchmarking, verification, and validation [3.2]. The RESRAD-Onsite 7.2 Users Guide [3.3] provided instructions for code use.

Sensitive RESRAD-Onsite input parameters have been identified for each radionuclide-of-concern (ROC) and conservative input values for use in DCGL calculations have been determined in ENG-OCS-007 [3.4].

The 75th percentile and 25th percentile values are recommended as reasonably conservative input values for the sensitive parameters in calculations for DCGL values for open land areas at the OCS site. The approach of assigning 25th and 75th percentile values of a sensitive parameters distribution to account for uncertainty in DCGL values has been accepted in past decommissioning projects (e.g., Yankee Rowe, Zion, Connecticut Yankee, Humboldt Bay, Fort Calhoun Station, and SMUD) by the U.S. Nuclear Regulatory Commission (NRC) and State regulators. Refer to ENG-OCS-007 for details regarding the probabilistic analyses.

RESRAD-Onsite code executions were performed for each ROC identified for the OCS site. The peak of the mean (POM) dose for each ROC was used to determine the DCGL value that corresponded to the NRC dose criteria established in 10CFR20.1403 (i.e., 25 mrem/y). The DCGL value for each ROC was calculated as follows:

DCGL(pCi/g) = (25 mrem/y)/(POM dose (mrem/y per 1 pCi/g)).

5.0 SCENARIO and INPUT 5.1 Scenario

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 2 of 18 5.1.1 The dose model behind the DCGL values is an Industrial Use Scenario. The average member of the critical group is a hypothetical full-time industrial worker who is assigned to outdoor tasks and catches and ingests fish from the intake/discharge canal during off-hours. As an industrial site, ingestion exposure pathways for plant, meat, and milk products originating on the site do not exist. Drinking water is assumed to be provided by a municipal water supply supported by site infrastructure. The exposure pathways used to estimate human radiation exposure resulting from residual radioactivity in the soil for this scenario are the following:

• Direct external radiation exposure pathway

• Inhalation exposure pathway

• Aquatic food ingestion exposure pathway

• Inadvertent ingestion of contaminated soil 5.1.2 Time fractions: The hypothetical industrial worker is assumed to spend 7h per day on outdoor tasks and 1h per day for indoor work breaks (i.e., 15 min morning break, 30 min lunch, and 15 min afternoon break). Under this assumption, the worker spends 35h/week performing outdoor tasks and 5h/week indoors on work breaks. Over a 50-week occupational year, the worker spends (35h/week

• 50 weeks =) 1750h outdoors at the industrial site and (5h/week

• 50 weeks =) 250 h indoors at the site. A calendar year has (24h/d

• 365.25d =) 8766h.

Fraction of calendar year off-site = (8766h - 2000h)/8766h = 0.77 (no exposure to radioactive material at the site during this time)

• Fraction of calendar year outdoors at the site = 1750h/8766h = 0.20 (receives site radiation exposure)

• Fraction of calendar year indoors at the site = 250h/8766h = 0.03 (receives site radiation exposure) 5.1.3 Site Conceptual Model: The conceptual hydrological model for this Industrial Use scenario has three geological strata: (1) a contaminated zone (CZ), (2) an unsaturated zone (UZ), and (3) a saturated zone (SZ). The contaminated zone is assumed to be uncovered, equivalent in size to the OCS Protected Area (PA),

124,400 m2. The UZ, SZ, and groundwater in the SZ are assumed initially uncontaminated.

5.2 Input 5.2.1 A site-specific suite of ROCs has been identified for the OCS site [3.6]. OCS ROCs are shown in Table 1 below.

Table 1: Radionuclides-of-Concern for input to RESRAD-Onsite:

ROCa Progenyb ROCa Progenyb Am-241 Np-237, Th-229, U-233 Nb-94 C-14 Ni-63 Cm-243 Ac-227, Am-243, Pa-231, Pu-239, U-235 Np-237 Th-229, U-233 Cm-244 Pu-240, Ra-228, Th-228, Th-232, U-236 Pu-238 Pb-210, Po-210, Ra-226, Th-230, U-234 Cs-137 Pu-239 Ac-227, Pa-231, U-235

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 3 of 18 ROCa Progenyb ROCa Progenyb Co-60 Pu-240 Ra-228, Th-228, Th-232, U-236 Eu-152 Gd-152 Pu-241 Am-241, Np-237, Th-229, U-233 Eu-154 Sb-125 Te-125m Fe-55 Sr-90 H-3 Tc-99 Mn-54 a ROC = radionuclide-of-concern identified for the OCS site.

b Included automatically with input of parent ROC.

5.2.2 Table 2 summarizes the following information from ENG-OCS-007:

RESRAD-Onsite parameters identified as sensitive.

ROC for which the parameter was determined to be sensitive.

25th and 75th percentile values from the parameter distributions.

5.2.3 Table 3 provides the input value for each RESRAD-Onsite parameter for the DCGL calculations. Separate RESRAD-Onsite code executions were performed for each ROC.

Note: Except for values assigned to sensitive parameters, all input values for non-sensitive parameters are the same as those used in the probabilistic analysis (ENG-OCS-007).

6.0 RESULTS 6.1 The calculated POM dose for each ROC is provided in column 2 of Table 4. The calculated POM doses from the RESRAD-Onsite 7.2 output reports are provided by ROC in Appendix A.

6.2 Column 3 of Table 4 provides the DCGL values corresponding to an annual dose equal to 25 mrem. The DCGL for each ROC was calculated from the POM dose using the following relationship:

DCGL(pCi/g) = (25 mrem/y)/(POM mrem/y per 1 pCi/g)

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 4 of 18 Table 2: RESRAD-Onsite Generated Percentile Values for Sensitive Input Parameters (from ENG-OCS-007)

Radionuclide Sensitive Parameter PRCC Value Am-241 Inhalation Rate Mass Loading for Inhalation Soil Ingestion 0.66 0.84 0.99 C-14 Thickness of CZ Kd in UZ 0.26

-0.51 Cm-243 Inhalation Rate Mass Loading for Inhalation External Shielding Factor Soil Ingestion 0.31 0.49 0.87 0.94 Cm-244 Inhalation Rate Mass Loading for Inhalation Soil Ingestion 0.63 0.82 0.99 Co-60 External Shielding Factor Kd in CZ 0.88 0.48 Cs-137 External Gamma Shielding Factor 0.96 Eu-152 External Shielding Factor Kd in CZ 0.87 0.48 Eu-154 External Shielding Factor Kd in CZ 0.86 0.48 Fe-55 Inhalation Rate Mass Loading for Inhalation Soil Ingestion 0.54 0.77 1.00 H-3 Thickness of CZ Evapotranspiration Coefficient Inhalation Rate Kd in CZ 0.71 0.59 0.80

-0.28 Mn-54 External Shielding Factor Kd in CZ 0.94 0.28 Nb-94 External Shielding Factor 0.96 Ni-63 Soil Ingestion Kd in CZ 1.00 0.36 Np-237 Kd in CZ Mass Loading for Inhalation External Shielding Factor Soil Ingestion 0.61 0.32 0.72 0.85 Pu-238 Inhalation Rate Mass Loading for Inhalation Soil Ingestion 0.62 0.84 0.99 Pu-239 Soil Ingestion Kd in CZ Kd in UZ 0.43 0.57

-0.34 Pu-240 Soil Ingestion Kd in CZ Kd in UZ 0.43 0.54

-0.29

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 5 of 18 Radionuclide Sensitive Parameter PRCC Value Pu-241 Kd of Am-241 in CZ Mass Loading for Inhalation Soil Ingestion Kd in CZ 0.44 0.47 0.93 0.28 Sb-125 External Shielding Factor Kd in CZ 0.85 0.73 Sr-90 External Shielding Factor Soil Ingestion Kd in CZ 0.66 0.89 0.59 Tc-99 Contaminated Fraction for Aquatic Food Kd in UZ Fish Transfer Factor 0.53

-0.31 0.80

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 6 of 18 Table 3. Summary of Values for RESRAD Input Parameters Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario RESRAD Exposure Pathways External Gamma Open Inhalation Open Plant Ingestion Close Meat Ingestion Close Milk Ingestion Close Aquatic Foods Open Drinking Water Close Soil Ingestion Open Radon Close Parameter (unit)

Typea Priorityb Treatmentc Value/Distribution Basis Distribution's Statistical Parametersd Median/

Mean 1

2 3

4 Soil Concentrations Basic radiation dose limit (mrem/y)

P 3

D 25 10 CFR 20.1402 NR NR NR NR Initial principal radionuclide (pCi/g)

P 2

D 1

Unit Value NR NR NR NR Distribution coefficients (sand soil type assigned to contaminated, unsaturated. and saturated zones) (cm3/g)

Ac-227 P

1 S

Truncated lognormal-n NUREG/CR-7267 7.44 1.1 0.001 0.999 1700 Am-241 P

1 D

S 3.7E+03 (CZ)

Truncated lognormal-n (UZ, SZ) 75th percentile ANL/EVS/TM-14/4 6.91 1.95 0.001 0.999 1000 Am-243 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 6.91 1.95 0.001 0.999 1000 C-14 P

1 D

S 6.2E+00 (UZ)

Truncated lognormal-n (CZ, SZ) 25th percentile NUREG/CR-7267 3.04 1.82 0.001 0.999 21 Cm-243 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 8.13 2.64 0.001 0.999 3400 Cm-244 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 8.13 2.64 0.001 0.999 3400 Co-60 P

1 D

S 1.8E+03 (CZ)

Truncated lognormal-n (UZ, SZ) 75th percentile ANL/EVS/TM-14/4 5.56 2.89 0.001 0.999 260 Cs-137 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 6.27 1.79 0.001 0.999 530 Eu-152 P

1 D

S 1.4E+04 (CZ)

Truncated lognormal-n (UZ,SZ) 75th percentile NUREG/CR-7267 6.86 4.01 0.001 0.999 955 Eu-154 P

1 D

S 1.4E+04 (CZ)

Truncated lognormal-n (UZ,SZ) 75th percentile NUREG/CR-7267 6.86 4.01 0.001 0.999 955 Fe-55 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 5.77 0

0.001 0.999 320 Gd-152 P

1 S

Truncated lognormal-n NUREG/CR-7267 1.61 3.22 0.001 0.999 5

H-3 P

1 D

S 4.3E-02 (CZ)

Truncated lognormal-n (UZ,SZ) 25th percentile NUREG/CR-7267

-2.81 0.5 0.001 0.999 0.06 Mn-54 P

1 D

S 5.8E+03 (CZ)

Truncated lognormal-n (UZ,SZ) 75th percentile ANL/EVS/TM-14/4 6.89 2.64 0.001 0.999 980

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 7 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Nb-94 P

1 S

Truncated lognormal-n NUREG/CR-7267 7.31 1.39 0.001 0.999 1500 Ni-63 P

1 D

S 6.1E+02 (CZ)

Truncated lognormal-n (UZ,SZ) 75th percentile ANL/EVS/TM-14/4 4.87 2.3 0.001 0.999 130 Np-237 P

1 D

S 3.6E+01 (CZ)

Truncated lognormal-n (UZ, SZ) 75th percentile ANL/EVS/TM-14/4 2.64 1.39 0.001 0.999 14 Pa-231 P

1 S

Truncated lognormal-n NUREG/CR-7267 7.6 1.1 0.001 0.999 2000 Pb-210 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 5.39 1.39 0.001 0.999 220 Po-210 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 4.61 1.79 0.001 0.999 100 Pu-238 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 5.99 1.39 0.001 0.999 400 Pu-239 P

1 D

S 1.0E+03 (CZ) 1.6E+02 (UZ)

Truncated lognormal-n (SZ) 75th percentile 25th percentile ANL/EVS/TM-14/4 5.99 1.39 0.001 0.999 400 Pu-240 P

1 D

D S

1.0E+03 (CZ) 1.6E+02 (UZ)

Truncated lognormal-n (SZ) 75th percentile 25th percentile ANL/EVS/TM-14/4 5.99 1.39 0.001 0.999 400 Pu-241 P

1 D

S 1.0E+03 (CZ)

Truncated lognormal-n (UZ, SZ) 75th percentile ANL/EVS/TM-14/4 5.99 1.39 0.001 0.999 400 Ra-226 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 8.04 2.08 0.001 0.999 3100 Ra-228 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 8.04 2.08 0.001 0.999 3100 Sb-125 P

1 D

S 5.6E+01 (CZ)

Truncated lognormal-n (UZ,SZ) 75th percentile ANL/EVS/TM-14/4 2.83 1.79 0.001 0.999 17 Sr-90 P

1 D

S 7.3E+01 (CZ)

Truncated lognormal-n (UZ.SZ) 75th percentile ANL/EVS/TM-14/4 3.09 1.79 0.001 0.999 22 Tc-99 P

1 D

S 1.9E-02 (UZ)

Truncated lognormal-n (CZ, SZ) 25th percentile ANL/EVS/TM-14/4

-3.22 1.1 0.001 0.999 0.04 Te-125m P

1 S

Truncated lognormal-n NUREG/CR-7267 6.31 3.22 0.001 0.999 550 Th-228 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 6.55 2.4 0.001 0.999 700 Th-229 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 6.55 2.4 0.001 0.999 700 Th-230 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 6.55 2.4 0.001 0.999 700 Th-232 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 6.55 2.4 0.001 0.999 700 U-233 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 4.7 2.48 0.001 0.999 110 U-234 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 4.7 2.48 0.001 0.999 110 U-235 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 4.7 2.48 0.001 0.999 110 U-236 P

1 S

Truncated lognormal-n ANL/EVS/TM-14/4 4.7 2.48 0.001 0.999 110 Initial concentration of radionuclides present in groundwater (pCi/l)

P 3

D 0

Ground water uncontaminated NR NR NR NR Calculation Times Time since placement of material (y)

P 3

D 0

NR NR NR NR Time for calculations (y)

P 3

D 1, 3, 10, 30, 100, 300, 1000 RESRAD Default NR NR NR NR

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 8 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Contaminated Zone Area of contaminated zone (m2)

P 2

D 124,400 OCGS PA NR NR NR NR Thickness of contaminated zone (m)

P 2

D S

3.0E+00 Uniform 75th percentile value assigned to C-14, H-3 Site-specific distribution; assigned to all other ROCs 0.1524 3.96 2.06 Length parallel to aquifer flow (m)

P 2

D 398 Site-specific - assumed diameter of a circle with an area = OCGS contaminated zone, 124,400 m2 NR NR NR NR Cover and Contaminated Zone Hydrological Data Cover depth (m)

P 2

D 0

No cover NR NR NR NR Density of contaminated zone (g/cm3)

P 1

S Bounded Normal NUREG/CR-7267 distribution for site soil type - sand.

1.5105 0.159 1.019 2.002 1.5105 Contaminated zone erosion rate (m/y)

P 2

D 6E-04 NUREG/CR-7267; assumed erosion rate for site with shallow slope (i.e., relatively level)

NR NR NR NR Contaminated zone total porosity P

2 S

Bounded Normal NUREG/CR-7267 distribution for site soil type - sand 0.43 0.06 0.2446 0.6154 0.43 Contaminated zone field capacity P

3 D

0.18 Value based on site-specific soil type (sand);

calculated using equation in NUREG/CR-7267 NR NR NR NR Contaminated zone hydraulic conductivity (m/y)

P 2

D 2741 2017 Hydrogeologic Investigation Report NR NR NR NR Contaminated zone b parameter P

2 S

Bounded Log Normal n NUREG/CR-7267 distribution for site soil type - sand

- 0.0253 0.216 0.501 1.90 0.975 Humidity in air (g/m3)

P 3

D 6.6 Figure 1 in Regional and Site-Specific Absolute Humidity Data for Use in Tritium Dose Calculations (figure provide below)

NR NR NR NR Evapotranspiration coefficient P

2 D

S 6.9E-01 Uniform 75th percentile assigned to H-3 NUREG/CR-7267 assigned to all other ROCs 0.5 0.75 0.625 Average annual wind speed (m/s)

P 2

D 3.13 Internet search:

https://www.windfinder.co m/windstatistics/oyster_cre ek_barnegat_bay NR NR NR NR Precipitation (m/y)

P 2

D 1.4 Annual Report on the Meteorological Program at Oyster Creek Generating Station - average annual precipitation for 2015 through 2020 NR NR NR NR Irrigation (m/y)

B 3

D 0.2 RESRAD default NR NR NR NR Irrigation mode B

3 D

Overhead Overhead irrigation is common practice for crops in U.S.

NR NR NR NR Runoff coefficient P

2 D

0.2 Value determined using methodology described in Data Collection Handbook and NUREG/CR-7267 NR NR NR NR

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 9 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Watershed area for nearby stream or pond (m2)

P 3

D 1.01E+08 NJ-GeoWeb (NJDEP BGIS)

NR NR NR NR Accuracy for water/soil computations 3

D 1.00E-03 RESRAD Default NR NR NR NR Saturated Zone Hydrological Data Density of saturated zone (g/cm3)

P 1

S Bounded Normal NUREG/CR-7267 Table C-1, distribution for site soil type - sand 1.5105 0.159 1.019 2.002 1.5105 Saturated zone total porosity P

1 S

Bounded Normal NUREG/CR-7267 distribution for site soil type - sand 0.43 0.06 0.2446 0.6154 0.43 Saturated zone effective porosity P

1 D

0.25 2017 Hydrogeologic Investigation Report NR NR NR NR Saturated zone field capacity P

3 D

0.18 Value based on site-specific soil type (sand);

calculated using equation in NUREG/CR-7267 NR NR NR NR Saturated zone hydraulic conductivity (m/y)

P 1

D 2741 2017 Hydrogeologic Investigation Report NR NR NR NR Saturated zone hydraulic gradient P

2 S

Uniform 2017 Hydrogeologic Investigation Report (section 5.1.4) 0.01 0.04 0.025 Saturated zone b parameter P

2 S

Bounded Log Normal n NUREG/CR-7267 distribution for site soil type - sand

- 0.0253 0.216 0.501 1.90 0.975 Water table drop rate (m/y)

P 3

D 1.00E-03 RESRAD Default NR NR NR NR Well pump intake depth (m below water table)

P 2

D 10 RESRAD Default NR NR NR NR Model:

Nondispersion (ND) or Mass-Balance (MB)

P 3

D ND ND model recommended for contaminant areas

>1,000 m2 NR NR NR NR Well pumping rate (m3/y)

P 2

N/A Input not required -

drinking water pathway inactive Unsaturated Zone Hydrological Data Number of unsaturated zone strata P

3 D

1 2017 Hydrogeologic Investigation Report (Figures 5.7 & 5.8)

NR NR NR NR Unsat. zone 1, thickness (m)

P 1

S uniform Distribution developed from depth range for site groundwater, 5 ft - 20 ft (2017 Hydrogeologic Investigation Report (section 2.4.3) and minimum thickness of CZ (0.5 ft) 1.37 5.94 3.65 Unsat. zone 1, soil density (g/cm3)

P 2

S Bounded Normal NUREG/CR-7267 distribution for site soil type - sand 1.5105 0.159 1.019 2.002 1.5105 Unsat. zone 1, total porosity P

2 S

Bounded Normal NUREG/CR-7267 distribution for site soil type - sand 0.43 0.06 0.2446 0.6154 0.43 Unsat. zone 1, effective porosity P

2 D

0.25 2017 Hydrogeologic Investigation Report NR NR NR NR

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 10 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Unsat. zone 1, field capacity P

3 D

0.18 Value based on site-specific soil type (sand);

calculated using equation in NUREG/CR-7267 NR NR NR NR Unsat. zone 1, hydraulic conductivity (m/y)

P 2

D 2741 2017 Hydrogeologic Investigation Report NR NR NR NR Unsat. zone 1, soil-specific b parameter P

2 S

Bounded Log Normal n NUREG/CR-7267 distribution for site soil type - sand

- 0.0253 0.216 0.501 1.90 0.975 Occupancy Inhalation rate (m3/y)

B 3

D S

9.9E+03 Triangular 75th percentile value assigned to Am-241, Cm-243, Cm-244, Fe-55, H-3, Pu-238 NUREG/CR-7267 assigned to all other ROCs 4380 8400 13000 8593 Mass loading for inhalation (g/m3)

P 2

D S

2.9E-05 Continuous linear 75th percentile value assigned to Am-241, Cm-243, Cm-244, Fe-55, Np-237, Pu-238, Pu-241 NUREG/CR-7267 assigned to all other ROCs 2.3E-5 Exposure duration B

3 D

30 RESRAD Default NR NR NR NR Indoor dust filtration factor P

2 S

Uniform NUREG/CR-7267 0.15 0.95 0.55 Shielding factor, external gamma P

2 D

S 4.0E-01 Bounded lognormal-n 75th percentile assigned to Cm-243, Co-60, Cs-137, Eu-152, Eu-154, Mn-54, Nb-94, Np-237, Sb-125, Sr-90 NUREG/CR-7267 assigned to all other ROCs

-1.3 0.59 0.044 1

0.2725 Fraction of time spent indoors B

3 D

0.03 Fraction of calendar year assuming 1h/work day for daily work breaks NR NR NR NR Fraction of time spent outdoors B

3 D

0.2 Fraction of calendar year assuming 7h/work day for outside tasks NR NR NR NR Shape factor flag, external gamma P

3 D

Circular RESRAD Default -

Circular contaminated zone assumed NR NR NR NR Ingestion, Dietary Fruits, vegetables, grain consumption (kg/y)

B 2

D N/A Input not required - plant ingestion pathway inactive NR NR NR NR Leafy vegetable consumption (kg/y)

B 3

D N/A Input not required - plant ingestion pathway inactive NR NR NR NR Milk consumption (L/y)

B 2

D N/A Input not required - milk ingestion pathway inactive NR NR NR NR Meat and poultry consumption (kg/y)

B 3

D N/A Input not required - meat ingestion pathway inactive NR NR NR NR Fish consumption (kg/y)

B 3

D 20.6 NUREG/CR-5512, Vol. 3 NR NR NR NR Other seafood consumption (kg/y)

B 3

D 0.9 RESRAD Default NR NR NR NR

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 11 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Soil & dust ingestion rate (g/yr)

B 2

D S

2.4E+01 Triangular 75th percentile value assigned to Am-241, Cm-243, Cm-244, Fe-55, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90 NUREG/CR-7267 assigned to all other ROCs 0

18.3 36.5 18.3 Drinking water intake (L/y)

B 2

N/A Input not required -

drinking water pathway inactive Contamination fraction of drinking water P

3 N/A Input not required -

drinking water pathway inactive Contamination fraction of household water P

3 N/A Input not required - water pathway inactive Contamination fraction of livestock water P

3 N/A Input not required -

drinking water/ingestion pathways inactive Contamination fraction of irrigation water P

3 N/A Input not required - plant ingestion pathway inactive Contamination fraction of aquatic food P

2 D

S 6.1E-01 Triangular 75th percentile assigned to Tc-99 NUREG/CR-7267 assigned to all other ROCs 0

0.39 1

0.45 Contamination fraction of plant food P

3 N/A Input not required - plant ingestion pathway inactive Contamination fraction of meat P

3 N/A Input not required - meat ingestion pathway inactive Contamination fraction of milk P

3 N/A Input not required - milk ingestion pathway inactive Ingestion, Non-Dietary Livestock fodder intake for meat (kg/d)

M 3

N/A Input not required - meat ingestion pathway inactive Livestock fodder intake for milk (kg/d)

M 3

N/A Input not required - milk ingestion pathway inactive Livestock water intake for meat (L/d)

M 3

N/A Input not required - water ingestion pathway inactive Livestock water intake for milk (L/d)

M 3

N/A Input not required - milk ingestion pathway inactive Livestock soil intake (kg/d)

M 3

N/A Input not required - meat ingestion pathway inactive Mass loading for foliar deposition (g/m3)

P 3

N/A Input not required - plant ingestion pathway inactive Depth of soil mixing layer (m)

P 2

D 0.15 RESRAD Default NR NR NR NR Depth of roots (m)

P 1

N/A Input not required - plant ingestion pathway inactive Drinking water fraction from ground water P

3 N/A Input not required -

drinking water ingestion pathway inactive Household water fraction from ground water (if used)

P 3

N/A Input not required -

drinking water pathway inactive Livestock water fraction from ground water P

3 N/A Input not required -

drinking water/meat ingestion pathways inactive

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 12 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Irrigation fraction from ground water P

3 N/A Input not required -

drinking water pathway inactive Wet weight crop yield for Non-Leafy (kg/m2)

P 2

N/A Input not required - plant ingestion pathway inactive Wet weight crop yield for Leafy (kg/m2)

P 3

N/A Input not required - plant ingestion pathway inactive Wet weight crop yield for Fodder (kg/m2)

P 3

N/A Input not required - meat ingestion pathway inactive Growing Season for Non-Leafy (y)

P 3

N/A Input not required - plant ingestion pathway inactive Growing Season for Leafy (y)

P 3

N/A Input not required - plant ingestion pathway inactive Growing Season for Fodder (y)

P 3

N/A Input not required - meat ingestion pathway inactive Translocation Factor for Non-Leafy P

3 N/A Input not required - plant ingestion pathway inactive Translocation Factor for Leafy P

3 N/A Input not required - plant ingestion pathway inactive Translocation Factor for Fodder P

3 N/A Input not required - meat ingestion pathway inactive Weathering Removal Constant for Vegetation (1/y)

P 2

N/A Input not required - plant ingestion pathway inactive Wet Foliar Interception Fraction for Non-Leafy P

3 N/A Input not required - plant ingestion pathway inactive Wet Foliar Interception Fraction for Leafy P

2 N/A Input not required - plant ingestion pathway inactive Wet Foliar Interception Fraction for Fodder P

3 N/A Input not required - meat ingestion pathway inactive Dry Foliar Interception Fraction for Non-Leafy P

3 N/A Input not required - plant ingestion pathway inactive Dry Foliar Interception Fraction for Leafy P

3 N/A Input not required - plant ingestion pathway inactive Dry Foliar Interception Fraction for Fodder P

3 N/A Input not required - meat ingestion pathway inactive Storage times of contaminated foodstuffs (days)

Fruits, non-leafy vegetables, and grain B

3 N/A Input not required - plant ingestion pathway inactive Leafy vegetables B

3 N/A Input not required - plant ingestion pathway inactive Milk B

3 N/A Input not required - milk ingestion pathway inactive Meat and poultry B

3 N/A Input not required - meat ingestion pathway inactive Fish B

3 D

7 RESRAD Default NR NR NR NR Crustacea and mollusks B

3 D

7 RESRAD Default NR NR NR NR Well water B

3 N/A Input not required -

drinking water pathway inactive

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 13 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Surface water B

3 N/A Input not required drinking water pathway inactive Livestock fodder B

3 N/A Input not required - meat ingestion pathway inactive Special Radionuclides (C-14)

C-12 concentration in water (g/cm3)

P 3

D 2.00E-05 RESRAD Default NR NR NR NR C-12 concentration in contaminated soil (g/g)

P 3

D 3.00E-02 RESRAD Default NR NR NR NR Fraction of vegetation carbon from soil P

3 D

2.00E-02 RESRAD Default NR NR NR NR Fraction of vegetation carbon from air P

3 D

9.80E-01 RESRAD Default NR NR NR NR C-14 evasion layer thickness in soil (m)

P 2

D 0.3 RESRAD Default NR NR NR NR C-14 evasion flux rate from soil (1/s)

P 3

D 7.00E-07 RESRAD Default NR NR NR NR C-12 evasion flux rate from soil (1/s)

P 3

D 1.00E-10 RESRAD Default NR NR NR NR Fraction of grain in beef cattle feed B

3 D

0.8 RESRAD Default NR NR NR NR Fraction of grain in milk cow feed B

3 D

0.2 RESRAD Default NR NR NR NR Inhalation Dose Conversion Factors (mrem/pCi inhaled) from FGR11 (contained in RESRAD Dose Conversion Library)

Ingestion Dose Conversion Factors (mrem/pCi ingested) from FGR11 (contained in RESRAD Dose Conversion Library)

Plant Transfer Factors (pCi/g plant)/(pCi/g soil) Note: Plant ingestion pathway closed - input for plant transfer factors not required for Industrial Use dose calculations.

Meat Transfer Factors (pCi/kg)/(pCi/d) Note: Meat ingestion pathway closed - input for meat transfer factors not required for Industrial Use dose calculations.

Milk Transfer Factors (pCi/L)/(pCi/d) Note: Milk ingestion pathway closed - input for milk transfer factors not required for Industrial Use dose calculations.

Bioaccumulation Factors for Fish ((pCi/kg)/(pCi/L))

Ac-227 P

2 S

Lognormal-n NUREG/CR-7267 3.2 1.1 Am-241 P

2 S

Lognormal-n NUREG/CR-7267 5.5 1.1 Am-243 P

2 S

Lognormal-n NUREG/CR-7267 5.5 1.1 C-14 P

2 S

Lognormal-n NUREG/CR-7267 13.0 1.1 Cm-243 P

2 S

Lognormal-n NUREG/CR-7267 3.4 1.1 Cm-244 P

2 S

Lognormal-n NUREG/CR-7267 3.4 1.1 Co-60 P

2 S

Lognormal-n NUREG/CR-7267 4.3 0.9 7.4E+01 Cs-137 P

2 S

Lognormal-n NUREG/CR-7267 7.8 0.9 2.4E+03 Eu-152 P

2 S

Lognormal-n NUREG/CR-7267 4.9 1.6 1.3E+02 Eu-154 P

2 S

Lognormal-n NUREG/CR-7267 4.9 1.6 1.3E+02 Fe-55 P

2 S

Lognormal-n NUREG/CR-7267 5.1 1.9 1.6E+02 Gd-152 P

2 S

Lognormal-n NUREG/CR-7267 3.4 1.1 3.0E+01 H-3 P

2 S

Lognormal-n NUREG/CR-7267 0

0.1 1.0E+00 Mn-54 P

2 S

Lognormal-n NUREG/CR-7267 5.5 1.9 2.4E+02 Nb-94 P

2 S

Lognormal-n NUREG/CR-7267 5.7 1.1 3.0E+02 Ni-63 P

2 S

Lognormal-n NUREG/CR-7267 3.0 0.6 2.0E+01 Np-237 P

2 S

Lognormal-n NUREG/CR-7267 3.0 1.1 2.0E+01 Pa-231 P

2 S

Lognormal-n NUREG/CR-7267 2.3 1.1 1.0E+01

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 14 of 18 Values and Bases for RESRAD-Onsite Parameters for DCGL Calculations Industrial Use Scenario Pb-210 P

2 S

Lognormal-n NUREG/CR-7267 3.2 1.1 2.5E+02 Po-210 P

2 S

Lognormal-n NUREG/CR-7267 3.6 1.5 3.7E+01 Pu-238 P

2 S

Lognormal-n NUREG/CR-7267 10.0 1.0 2.2E+04 Pu-239 P

2 S

Lognormal-n NUREG/CR-7267 10.0 1.0 2.2E+04 Pu-240 P

2 S

Lognormal-n NUREG/CR-7267 10.0 1.0 2.2E+04 Pu-241 P

2 S

Lognormal-n NUREG/CR-7267 10.0 1.0 2.2E+04 Ra-226 P

2 S

Lognormal-n NUREG/CR-7267 1.4 1.9 4.1E+00 Ra-228 P

2 S

Lognormal-n NUREG/CR-7267 1.4 1.9 4.1E+00 Sb-125 P

2 S

Lognormal-n NUREG/CR-7267 3.6 1.5 3.7E+01 Sr-90 P

2 S

Lognormal-n NUREG/CR-7267 1.1 1.4 3.0E+00 Tc-99 P

2 D

4.2E+01 75th percentile Te-125m P

2 S

Lognormal-n NUREG/CR-7267 5.0 0.4 1.5E+02 Th-228 P

2 S

Lognormal-n NUREG/CR-7267 4.6 1.1 9.9E+01 Th-229 P

2 S

Lognormal-n NUREG/CR-7267 4.6 1.1 9.9E+01 Th-230 P

2 S

Lognormal-n NUREG/CR-7267 4.6 1.1 9.9E+01 Th-232 P

2 S

Lognormal-n NUREG/CR-7267 4.6 1.1 9.9E+01 U-233 P

2 S

Lognormal-n NUREG/CR-7267 0.0 2.5 1.0E+00 U-234 P

2 S

Lognormal-n NUREG/CR-7267 0.0 2.5 1.0E+00 U-235 P

2 S

Lognormal-n NUREG/CR-7267 0.0 2.5 1.0E+00 U-236 P

2 S

Lognormal-n NUREG/CR-7267 0.0 2.5 1.0E+00 Bioaccumulation Factors for Crustacea/ Mollusks ((pCi/kg)/(pCi/L)) RESRAD default value for each radionuclide applied Graphics Parameters Number of points 32 RESRAD Default NR NR NR NR Spacing log RESRAD Default NR NR NR NR Time integration parameters Maximum number of points for dose 17 RESRAD Default NR NR NR NR Table 3 Notes:

a P = physical, B = behavioral, M = metabolic b 1 = high-priority parameter, 2 = medium-priority parameter, 3 = low-priority parameter c D = deterministic, S = stochastic NR = none recommended d Distributions Statistical Parameters:

Lognormal-n: 1= mean, 2 = standard deviation Bounded lognormal-n: 1= mean, 2 = standard deviation, 3 = minimum, 4 = maximum Truncated lognormal-n: 1= mean, 2 = standard deviation, 3 = lower quantile, 4 = upper quantile Bounded normal: 1 = mean, 2 = standard deviation, 3 = minimum, 4 = maximum Triangular: 1 = minimum, 2 = mode, 3 = maximum Uniform: 1 = minimum, 2 = maximum

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 15 of 18 Table 4: RESRAD Onsite Generated POM Doses and DCGL Values by ROC ROC POM Dose (mrem/y per pCi/g)

DCGL (pCi/g)

Am-241 3.42E-02 7.31E+02 C-14 1.21E-02 2.07E+03 Cm-243 1.38E-01 1.81E+02 Cm-244 1.37E-02 1.82E+03 Co-60 3.15E+00 7.94E+00 Cs-137 6.99E-01 3.58E+01 Eu-152 1.42E+00 1.76E+01 Eu-154 1.53E+00 1.63E+01 Fe-55 2.98E-06 8.39E+06 H-3 4.98E-04 5.02E+04 Mn-54 7.34E-01 3.41E+01 Nb-94 2.01E+00 1.24E+01 Ni-63 3.23E-06 7.74E+06 Np-237 4.35E-01 5.75E+01 Pu-238 2.20E-02 1.14E+03 Pu-239 8.17E-02 3.06E+02 Pu-240 8.57E-02 2.92E+02 Pu-241 1.00E-03 2.50E+04 Sb-125 4.50E-01 5.56E+01 Sr-90 5.89E-03 4.24E+03 Tc-99 1.82E-03 1.37E+04 NOTE: The DCGL values in column 3 can be adjusted to meet a revised release criterion by multiplying by the ratio of the revised release criterion (mrem/y) to 25 mrem/y. If administrative reduction is desired, the DCGL values can be reduced by multiplying by the desired administrative reduction factor.

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 16 of 18 Appendix A POM Doses by ROC Calculated Using the RESRAD-Onsite 7.2 Code

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 17 of 18 Am-241 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/14/2023 12:58 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Am241 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\AM241\\OC_IU_DCGL_AM241.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 3.423E-02 C-14 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 14:35 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_C14 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\C14\\OC_IU_SOIL_DCGL_C-14.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 4.125E+01 1.210E-02 Cm-243 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 14:51 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Cm243 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\CM243\\OC_IU_SOIL_DCGL_CM243.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 1.379E-01 Cm-244 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 15:19 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Cm244 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\CM244\\OC_IU_SOIL_DCGL_CM244.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 1.371E-02 Co-60 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 15:31 Page 20 Probabilistic results summary : OC_IU_Soil_DCGL_Co60 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\CO60\\OC_IU_SOIL_DCGL_CO60.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 3.148E+00 Cs-137 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 15:41 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Cs137 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\CS137\\OC_IU_SOIL_DCGL_CS137.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 6.992E-01 Eu-152 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 15:49 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Eu152 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\EU152\\OC_IU_SOIL_DCGL_EU152.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 1.417E+00 Eu-154 Results:

1RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 15:58 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Eu154 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\EU154\\OC_IU_SOIL_DCGL_EU154.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 1.531E+00

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 18 of 18 Fe-55 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 16:07 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Fe55 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\FE55\\OC_IU_SOIL_DCGL_FE55.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 2.981E-06 H-3 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 16:19 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_H3 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\H3\\OC_IU_SOIL_DCGL_H3.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 4.984E-04 Mn-54 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/12/2023 16:28 Page 20 Probabilistic results summary : OCNGS Industrial Use_Soil_DCGL_Mn54 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\RESRAD OC IU FILES\\MN54\\OC_IU_DCGL_MN54.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 7.335E-01 Nb-94 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/18/2023 09:59 Page 20 Probabilistic results summary : OC_IU_DCGL_Nb94 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\NB94\\OC_IU_DCGL_NB94.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 2.008E+00 Ni-63 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/11/2023 14:33 Page 20 Probabilistic results summary : OC_IU_DCGL_Ni63 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\NI63\\OC_IU_DCGL_NI63.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 3.225E-06 Np-237 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/18/2023 14:02 Page 20 Probabilistic results summary : OC_IU_DCGL_Np237 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\NP237\\OC_IU_DCGL_NP237.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 4.350E-01 Pu-238 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/18/2023 10:33 Page 20 Probabilistic results summary : OC_IU_DCGL_Pu238 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\PU238\\OC_IU_DCGL_PU238.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 2.202E-02 Pu-239 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 01/17/2024 09:29 Page 20 Probabilistic results summary : OCNGS Industrial Use_DCGL_Pu240 r1 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\PU240\\OC_DCGL IU_PU240.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 1.000E+03 8.173E-02

BHI Engineering ENG-OCS-008 DCGL Values for Soil - Industrial Use Scenario Rev. 0 Page 19 of 18 Pu-240 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 01/21/2024 09:55 Page 20 Probabilistic results summary : OC_IU_DCGL_Pu240_KL File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\IU_SOIL\\PU240\\OC_IU_DCGL_PU240-KL.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 1.000E+03 8.570E-02 Pu-241 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/18/2023 16:02 Page 20 Probabilistic results summary : OC_IU_DCGL_Pu241 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\PU241\\OC_IU_DCGL_PU241.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 5.380E+01 1.002E-03 Sb-125 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/18/2023 10:09 Page 20 Probabilistic results summary : OC_IU_DCGL_Sb-125 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\SB125\\OC_IU_DCGL_SB125.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 4.500E-01 Sr-90 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/11/2023 16:33 Page 20 Probabilistic results summary : OC_IU_DCGL_Sr-90 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\SR90\\OC_IU_DCGL_SR90.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 0.000E+00 5.891E-03 Tc-99 Results:

RESRAD-ONSITE, Version 7.2 T<< Limit = 30 days 07/11/2023 16:45 Page 20 Probabilistic results summary : OC_IU_DCGL_Tc-99 File : C:\\RESRAD_FAMILY\\ONSITE\\7.2\\USERFILES\\TC99\\OC_IU_DCGL_TC99.RAD Peak of the mean dose (averaged over observations) at graphical times Repetition Time of peak mean dose Peak mean dose Years mrem/yr 1 1.701E+00 1.820E-03