Code of Vermont Rules › Agency 12 - AGENCY OF NATURAL RESOURCES › Sub-Agency 032 - WASTE MANAGEMENT DIVISION › Chapter 012 - VERMONT GROUNDWATER PROTECTION RULE AND STRATEGY › Section 12 032 012 - VERMONT GROUNDWATER PROTECTION RULE AND STRATEGY

Current through June,
				2024
Appendix D Hazardous Materials Listing
Pursuant to
				  10 V.S.A. §
										6602(16)(A)(iv) any chemical
				  or substance listed in the following table is a hazardous material.
CAS Number
Chemical Name
335-67-1
perfluorooctanic acid (PFOA)
1763-23-1
perfluoro-octane sulfonic acid (PFOS)
355-46-4
perfluorohexane sulfonic acid (PFHxS)
375-85-9
perfluoroheptanoic acid (PFHpA)
375-95-1
perfluorononanoic acid (PFNA)
Section D1 HAZARDOUS MATERIALS LISTING
Pursuant to
				  10 V.S.A. §
										6602(16)(A)(iv) any chemical
				  or substance listed in the following table is a hazardous material.
CAS Number
Chemical Name
335-67-1
perfluorooctanic acid (PFOA)
1763-23-1
perfluoro-octane sulfonic acid (PFOS)
355-46-4
perfluorohexane sulfonic acid (PFHxS)
375-85-9
perfluoroheptanoic acid (PFHpA)
375-95-1
perfluorononanoic acid (PFNA)
Appendix E Cumulative Risk Assessments
Nota bene: risk-based concentration (rbc) means the
				  calculated concentration of a chemical (or group of chemicals) in an
				  environmental medium estimated to correspond to a fixed level of risk e.g., a
				  target Hazard Quotient (THQ) of 1.0 for noncarcinogenic (systemic, threshold)
				  effects or target incremental lifetime cancer risk (ILCR) of one-in-one-million
				  (1x10 [-6) ], for a predefined hypothetical human exposure scenario. Examples
				  of rbcs for different environmental media based on different hypothetical
				  exposure scenarios are included in this appendix as Tables 1-3.
I. SAMPLE-WISE APPROACH
For each Hypothetical Human Receptor Scenario and exposure
				  medium (i.e., Soil, Indoor Air):
1. In
				accordance with the IRULE, for each sample, identify chemicals that are present
				above detection and retained for further consideration.
2. For each chemical, identify and record its
				receptor and medium-specific cancer and noncancer risk-based concentration
				(rbc) if both are available. Segregate cancer (c) from noncancer (nc) rbcs.
3. For each carcinogen in a
				sample, calculate the associated Incremental Lifetime Cancer Risk (ILCR):
a. Calculate the ILCR associated with each
				individual chemical that has a cancer rbc:
For a given chemical i in sample j:
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b.
				Calculate the cumulative ILCR across all chemicals in a sample that have a
				cancer rbc:
For a given number of chemicals (n) in sample j, where i is
				  the first chemical:
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4. For each noncarcinogen in a sample,
				calculate the associated Hazard Quotient (HQ):
a. Calculate the HQ associated with each
				individual chemical that has a noncancer rbc:
For given a chemical i in sample j:
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b.
				Calculate the Hazard Index (sum of HQs) across all chemicals in a sample that
				have a noncancer rbc. Do not segregate chemicals by critical effect.
For a given number of chemicals (n) in sample j, where i is
				  the first chemical:
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Example Sample-wise Calculation for Direct Contact to Soil:
				  Residential Scenario
1. Benzene and
				ethylbenzene are detected in Soil Sample S01 at the following concentrations
Analyte
Soil Sample S01 (mg/kg)
Benzene
4.00E-01
Ethylbenzene
6.00E+00
2.
				Use Table 1 to find Residential Soil cancer and noncancer rbcs for benzene and
				ethylbenzene:
Analyte
Sample Concentration Soil Sample S01
							 (mg/kg)
Resident - Soil rbcs from Table 1
rbccancer *
								(mg/kg)
rbcnoncancer
							 * (mg/kg)
Benzene
4.00E-01
6.98E-01
1.11E+02
Ethylbenzene
6.00E+00
3.68E+00
4.45E+02
[*] Cancer rbcs are based on target ILCR=1E [-06; ] noncancer
				  rbcs are based on target HQ=1.0
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7. It may be helpful to consolidate all this
				information into a table such as the following:
Resident - Soil
CANCER
NONCANCER
Analyte
Site Concentration Sample S01
							 (mg/kg)
a
								rbccancer (mg/kg)
Sample S01 ILCR (unitless)
b
								rbcnoncancer (mg/kg)
Sample S01 HQ (unitless)
Benzene
4.00E-01
6.98E-01
5.73E-07
1.11E+02
3.60E-02
Ethylbenzene
2.00E+00
3.68E+00
1.63E-06
4.45E+02
1.35E-02
Sample S01 Cumulative ILCR =
2.20E-06
Sample S01 Hazard Index =
4.95E-01
a. Cancer rbcs
				are based on a target Risk of 1E [-06 ]
b. Noncancer rbcs are based on a target
				Hazard Quotient of 1.0
8. The Cumulative ILCR and HI can now be
				compared to the target ILCR and target HI to determine whether further action
				is warranted:
a. Is the cumulative ILCR >
				the target cancer risk?
Is 2.20E [-06 ]>1E [-06 ]?
Yes
b. Is
				the HI > the target HI?
Is 4.59E [-01 ]>1
No
c.
				Because the Cumulative ILCR is greater than the target ILCR for the site,
				further attention is warranted.