Statutes, codes, and regulations
Rhode Island Administrative Code
Title 250 - Department of Environmental ManagementChapter 140 - Waste and Materials ManagementSubchapter 30 - Site Remediation
Part 1 - Rules and Regulations for the Investigation and Remediation of Hazardous Material Releases
Section 250-RICR-140-30-1.17 - Method 2 Direct Exposure Criteria .

250 R.I. Code R. 250-RICR-140-30-1.17

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Section 250-RICR-140-30-1.17 - Method 2 Direct Exposure Criteria .
1.17.1. Method 2 Direct Exposure Criteria
A. Ingestion
1. Residential Activity
a. Carcinogenic Substances - Residential Ingestion Algorithm for Carcinogens in Soil.

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b. Non-Carcinogenic Substances - Residential Ingestion Algorithm for Non-Carcinogens in Soil.

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c. Acute Toxicity - Acute Ingestion Algorithm for Soil.

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1.17.2.Residential Default Input Parameters.
A. Method 2 Residential Default Values

ORAL INGESTION

TER M

DESCRIPTION

UNITS

VALUE

C

Concentration of Contaminant in Soil

mg/kg

Calculated

CPSo

Carcinogenic Potency Slope Factor (Oral)

(mg/kg/d)-1

Chemical Specific

RfDo

Reference Dose (Oral)

mg/kg/d

Chemical Specific

RISK

Target Cancer Risk Level

Dimensionles s

1 E-06

HI

Hazard Index

Dimensionles s

1.0

BWa

Body Weight (Adult)

kg

70

BWc

Body Weight (Child Ages 1-6)

kg

15

AT

Averaging Time (Carcinogens)

yr

70

ATc

Averaging Time (Child Ages 1-6)

yr

6

IRSa

Soil Ingestion (Adult)

mg/d

100

IRSc

Soil Ingestion (Child Ages 1-6)

mg/d

200

CF

Conversion Factor

mg-d/kg-yr

3.65 E08*

EF

Exposure Frequency

d/yr

350

EDa

Exposure Duration (Adult)

yr

24

EDc

Exposure Duration (Child Ages 1-6)

yr

6

ORAL ACUTE TOXICITY

TDHA

Ten Day Health Advisory (10 kg Child)

mg/l

Chemical Specific

IRat-w

Ingestion Rate of Water

l/d

1

IRat-s

Ingestion Rate of Soil

g/d

1

CFat

Conversion Factor (Acute Toxicity)

kg/g

1 E-03

1. Industrial/Commercial Activity
a. Carcinogenic Substances - Industrial/Commercial Algorithm for Carcinogens in Soil.

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b. Non-Carcinogenic Substances - Industrial/Commercial Ingestion Algorithm for Carcinogens in soil

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1.17.3. Industrial/Commercial Default Input Parameters.
A. Method 2 Industrial/Commercial Default Values

Industrial/Commercial Default Input Parameters

TERM

DESCRIPTION

UNITS

VALUE

C

Concentration of Contaminant in Soil

mg/kg

Calculated

CPSo

Carcinogenic Potency Slope Factor (Oral)

(mg/kg/d)-1

Chemical

Industrial/Commercial Default Input Parameters

Specific

RfDo

Reference Dose (Oral)

mg/kg/d

Chemical Specific

RISK

Target Cancer Risk Level

Dimensionless

1 E-06

HI

Hazard Index

Dimensionless

1

BWa

Body Weight (Adult)

kg

70

AT

Averaging Time (Carcinogens)

yr

70

ATa

Averaging Time, Adult (Non-carcinogens)

yr

25

IRSa

Soil Ingestion Rate (Adult)

mg/d

50

EF

Exposure Frequency

d/yr

250

ED

Exposure Duration

yr

25

CF

Conversion Factor

mg-d/kg-yr

3.65 E08*

B. Inhalation
1. The Residential inhalation concentration shall be calculated using the following equations and the appropriate default input values:
a. Carcinogenic Substances - Inhalation Algorithm for Carcinogens in Soil

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b. Non-Carcinogenic Substances - Inhalation Algorithm for Non-Carcinogens in Soil.

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c. Volatilization Factor - Volatilization Factor Algorithm

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1.17.4. Residential Default Input Parameters

INHALATION

TERM

DESCRIPTION

UNITS

VALUE

C

Concentration of Contaminant in Soil

mg/kg

Calculated

RISK

Target Cancer Risk Level (Carcinogens)

Dimensionless

10-6

HI

Hazard Index (Noncarcinogens)

Dimensionless

1

AT

Averaging Time (Carcinogens)

years

70

AT

Averaging Time (Noncarcinogens)

years

30

URF

Inhalation Unit Risk Factor (Carcinogens)

(µg/m3)-1

Chemical Specific

RfC

Inhalation Reference Concentration

mg/m3

Chemical

(Noncarcinogens)

Specific

EF

Exposure Frequency

days/year

350

ED

Exposure Duration

years

30

VF

Soil-To-Air Volatilization Factor

m3/kg

Chemical Specific

PEF

Particulate Emission Factor

m3/kg

4.51 x 109

TA

Time Adjustment Factor

Dimensionless

1

1.17.5. Default Input Parameters.
A. Volatilization Factor

Volatilization Factor

TERM

DESCRIPTION

UNITS

VALUE

VF

Soil-To-Air Volatilization Factor

m3/kg

Calculated

(Q/C)

Inverse Of The Mean Concentration At The Center Of A 0.5 Acre Square Source

g/m2-s per kg/m3

101.8

T

Exposure Interval

seconds

7.9 x 108

Dei

Effective Diffusivity

cm2/s

Di(Pa3.33/Pt2)

Pa

Air-Filled Soil Porosity

Dimensionless

Pt-(THETA)(BETA)

Pt

Total Soil Porosity

Dimensionless

1-((BETA)/(RHO)s)

e

Soil Moisture Content

cm3-water/g-soil

0.1 (10%)

3

Soil Bulk Density

g/cm3

1.5

(RHO)s

True Soil Density Or Particle Density

g/cm3

2.65

Kas

Soil-Air Partition Coefficient

g-soil/cm3-air

(H/Kd) x 41

Di

Diffusivity In Air

cm2/s

Chemical Specific

H

Henry's Law Constant

atm-m3/mol

Chemical Specific

Kd

Soil-Water Partition Coefficient

cm3/g

Koc x OC

Koc

Organic Carbon Partition Coefficient

cm3/g

Chemical Specific

OC

Organic Carbon Content Of Soil

fraction

0.02 (2%)

1. Soil Saturation Limit (Csat) - Soil Saturation Limit Algorithm for Unsaturated Soils (Csat)

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1.17.6. Soil Saturation (C sat) Default Input Parameters
A. Soil Saturation (Csat) Default Input Parameters

TERM

DESCRIPTION

UNITS

VALUE

Csat

Soil Saturation Concentration

mg/kg

Calculated

Kd

Soil-Water Partition Coefficient

L/kg

Chemical Specific/

or Koc * OC

Koc

Organic Carbon Partition Coefficient

L/kg

Chemical

Specific

OC

Organic Carbon Content Of Surface Soil

%

2

S

Solubility

mg/L-water

Chemical Specific

nm

Soil Moisture Content

Weight Fraction

0.1

(THETA)m

Soil Moisture Content

L-water/ kg-soil

0.1

B. § 1.17 of this Part was also utilized for the development of Method 1 Direct Exposure Criteria.

250 R.I. Code R. 250-RICR-140-30-1.17

Amended effective 4/22/2020