A1+-+Tier+1+Risk+Based+Screening+Levels.pdf
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- Solicitation number
- 303-23-013
- Issued by
- Sargent County, North Dakota
About this file
This document is a technical data table titled "NDRBCA Table 6-1(b) Tier 1 Risk Based Screening Levels for Commercial/Industrial Worker" from the North Dakota Department of Environmental Quality (NDDEQ). The table presents risk-based screening levels for various chemical compounds including VOCs (Volatile Organic Compounds), PAHs (Polycyclic Aromatic Hydrocarbons), metals, chlorinated solvents, and per- and polyfluorinated substances (PFAS). The screening levels are categorized across different exposure pathways including air (indoor), surface soil, soil vapor, subsurface soil, and groundwater measurements.
The table provides specific concentration limits measured in different units (µg/m3, mg/kg, µg/L) for each chemical compound, identified by both chemical name and CAS number. Notable inclusions are regulatory limits for common industrial chemicals like benzene, toluene, various metals such as arsenic and lead, and emerging contaminants like PFOA and PFOS. The values were obtained from Regional Screening Level (RSL) Summary Tables (USEPA, May 2024) and include specific notations for cases where calculated values exceed saturated soil concentration, chemical vapor pressure, or chemical solubility.
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Text version
Air Soil*
Indoor Protective of Groundwater
[µg/m3] [mg/kg]
VOCs Benzene 71-43-2 15.7 50.8 524 0.00256 5 69.3 Ethylbenzene 100-41-4 49.1 254 1640 0.785 700 152 Isopropylbenzene (Cumene) 98-82-8 1750 9950 c 58400 0.738 450 3730 Methyl tert-Butyl Ether (MTBE) 1634-04-4 472 2050 15700 0.0322 140 19700 Naphthalene 91-20-3 3.61 85.7 120 0.00385 1.2 201 1,2,4-Trimethylbenzene 95-63-6 263 1770 c 8760 0.0808 56 1040 1,3,5-Trimethylbenzene 108-67-8 263 1510 c 8760 0.0866 60 733 Toluene 108-88-3 21900 46800 c 730000 0.692 1000 80700 Xylene, Total 1330-20-7 438 2490 c 14600 9.9 10000 1620
PAHs Acenaphthene 83-32-9 NA 45200 68.1 5.49 530 4170 Anthracene 120-12-7 NA 226000 NA 58.1 1800 NA Benzo(a)anthracene 56-55-3 2.04 206 NA 0.105 0.3 NA Benzo (a) Pyrene 50-32-8 0.00876 21.1 NA 0.235 0.2 NA Benzo(b)fluoranthene 205-99-2 2.04 21.1 NA 3 2.5 NA Benzo(k)fluoranthene 207-08-9 20.4 2110 NA 29.4 25 NA Chrysene 218-01-9 204 21100 NA 90.5 250 NA Ethylene dibromide 106-93-4 0.204 1.59 6.81 0.000014 0.05 7.69 Fluoranthene 206-44-0 NA 30100 NA 89.1 800 NA Fluorene 86-73-7 NA 30100 NA 5.45 290 NA Indeno (1,2,3-cd) Pyrene 193-39-5 2.04 211 NA 9.78 2.5 NA 1-Methylnapthalene 90-12-0 0.0131 0.77 c 0.438 0.0000329 11 0.625 2-Methylnapthalene 91-57-6 NA 3010 NA 0.185 36 NA Naphthalene 91-20-3 3.61 85.7 120 0.00385 1.2 201 Pyrene 129-00-0 NA 22600 NA 13.2 120 NA
Metals Arsenic 7440-38-2 0.0285 30 NA 0.292 10 NA Barium 7440-39-3 2.19 217000 NA 82.4 2000 NA Beryllium 7440-41-7 0.0511 2290 NA 3.16 4 NA Cadmium (diet) 0.0438 99.7 NA NA NA NA Cadmium (water) 0.0438 NA NA 0.376 5 NA Chromium (III) 16065-83-1 0.0263 1750000 NA 40400000 22000 NA Chromium (VI) 18540-29-9 0.00146 63.3 NA 0.00672 0.35 NA Chromium (total) 7440-47-3 NA NA NA 180000 100 NA Lead 7439-92-1 NA NA NA 13.5 15 NA Manganese (non-diet) 7439-96-5 0.219 25600 NA 28.3 430 NA Mercury (elemental) 7439-97-6 1.31 45.6 c 43.8 0.104 2 3.73 Selenium 7782-49-2 87.6 5840 NA 0.26 50 NA Silver 7440-22-4 NA 5840 NA 0.799 94 NA
Chlorinated Solvents Hexachloroethane 67-72-1 11.1 80.5 372 0.002 3.3 70.1 Pentachloroethane 76-01-7 NA 363 NA 0.0031 6.5 NA 1,1,1,2-Tetrachloroethane 630-20-6 16.6 87.5 552 0.00219 5.7 162 1,1,2,2-Tetrachloroethane 79-34-5 2.11 26.7 70.5 0.000296 0.76 141 1,1,2-Trichloroethane 79-00-5 0.876 6.31 29.2 0.00162 5 26 1,1,1-Trichloroethane 71-55-6 2190 35600 c 730000 0.0701 200 31100 1,2-Dichloroethane 107-06-2 4.72 20.4 157 0.00142 5 97.8 1,1-Dichloroethane 75-34-3 76.7 155 2560 0.00782 28 334 Chloroethane 75-00-3 17500 22700 c 584000 2.37 8300 38600 Perchloroethene (PCE) 127-18-4 175 389 c 5840 0.00227 5 242 Trichloroethene (TCE) 79-01-6 8.76 18.7 292 0.00179 5 21.8 1,1-Dichloroethene 75-35-4 876 995 29200 0.00251 7 821 cis-1,2-Dichloroethene 156-59-2 175 369 5840 0.0206 70 1050 trans-1,2-Dichloroethene 156-60-5 175 302 5840 0.0313 100 457 Vinyl chloride (VC) 75-01-4 27.9 16.8 929 0.00069 2 24.5
Per- and Polyfluorinated Substances [ng/L]
PFOA 335-67 NA NA NA NA 4 NA
PFOS 1763-23-1 NA NA NA NA 4 NA
PFHxS 355-46-4 NA NA NA NA 10 NA
PFNA 375-95-1 NA NA NA NA 10 NA
HFPO-DA 13252-13-6 NA NA NA NA 10 NA
Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, or PFBS
NA NA NA NA NA
1 (Unitless)
Hazard Index
NA
NDDEQ Specific [µg/m3] [mg/kg] [µg/m3] [mg/kg] [mg/L] [mg/L] Ammonia 7664-41-7 2190 NA 73000 NA 5 3330
Bromide 7726-95-6 NA NA NA NA NA NA Chloride 16887-00-6 NA NA NA NA 250 NA Nitrate as total nitrogen 14797-55-8 NA 1870000 NA 500 10 NA Strontium 7440-24-6 NA 701000 NA 422 12 NA Total Kjeldahl Nitrogen (TKN) NA NA NA NA 500 10 NA Total Petroleum Hydrocarbons (TPH) NA NA NA NA 100 0.5 NA
Notes:
*: Surface and subsurface NA: Not available c: calculated RBSL shown in the table exceeded the saturated soil concentration p: calculated soil vapor RBTL shown in the table exceeded the chemical vapor pressure s: calculated RBSL shown in the table exceeded the chemical solubility
The above values were obtained from Regional Screening Level (RSL) Summary Tables (USEPA, May 2024)
(Sub-slab) Indoor Inhalation of Vapors
[µg/m3]
7440-43-9
Groundwater
Inhalation of Vapors
[µg/L]
NDRBCA Table 6-1(b) Tier 1 Risk Based Screening Levels for Commercial/Industrial Worker
Chemical CAS #
Surface Soil Soil Vapor
Ingestion, dermal contact, and outdoor inhalation of vapors and particulates
Domestic Use (Ingestion, dermal contact)
[mg/kg]
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