Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.24 - STANDARDS AND PROCEDURES FOR APPLICATION OF RISK BASED CORRECTIVE ACTION AT PETROLEUM RELEASE SITES
Section 58.01.24.300 - SITE SPECIFIC RISK EVALUATION REQUIREMENTS
Universal Citation: ID Admin Code 58.01.24.300
Current through August 31, 2023
01. General Requirements. The general requirements for human health risk evaluations shall include, at a minimum: (3-31-22)
a. A conceptual site model which describes
contaminant sources; release mechanisms; the magnitude, spatial extent, and
temporal trends of petroleum contamination in all affected media; transport
routes; current and reasonably likely future land use and human receptors; and
relevant exposure scenarios. (3-31-22)
b. Toxicity Information derived from
appropriate sources including, but not limited to, those listed in Subsection
300.01.e. (3-31-22)
c. Data quality objectives and sampling
approaches based on the conceptual site model that support the risk evaluation
and risk management process. (3-31-22)
d. Estimated exposure point concentrations
for a reasonable maximum exposure based on a conservative estimate of the mean
of concentrations of chemicals that would be contacted by an exposed receptor.
(3-31-22)
e. Exposure analysis
including identification of contaminants of concern, potentially exposed
populations, pathways and routes of exposure, exposure point concentrations and
their derivation, and a quantitative estimate of reasonable maximum exposure
for both current and reasonably likely future land and water use scenarios.
Appropriate reference sources of reasonable maximum exposure factor information
may include, but are not limited to: (3-31-22)
i. U.S. EPA RAGS, Volume 1;
(3-31-22)
ii. U.S. EPA Exposure
Factors Handbook; (3-31-22)
iii.
Idaho Risk Evaluation Manual for Petroleum Releases; and (3-31-22)
iv. Other referenced technical publications.
(3-31-22)
f. Risk
characterization presenting the quantitative human health risks and a
qualitative and quantitative assessment of uncertainty for each portion of the
risk evaluation. (3-31-22)
g. Risk
evaluations may include the use of transport and fate models, subject to
Department approval of the model and the data to be used for the parameters
specified in the model. (3-31-22)
02. Specific Requirements. Human health risk evaluations shall, at a minimum: (3-31-22)
a. Utilize an acceptable target risk level as
defined in Section 010;
(3-31-22)
b. Utilize an acceptable
target hazard index as defined in Section
010; (3-31-22)
c. Utilize an acceptable target hazard
quotient as defined in Section
010; (3-31-22)
d. Evaluate the potential for exposure from:
(3-31-22)
i. Ground water ingestion;
(3-31-22)
ii. Direct contact with
contaminated soils resulting from soil ingestion, dermal contact, and
inhalation of particulates and vapors; (3-31-22)
iii. Indoor inhalation of volatile chemicals
via volatilzation of chemicals from soil, ground water, or free phase product;
(3-31-22)
iv. Ingestion,
inhalation, or dermal exposure to ground water and/or surface water which has
been impacted by contaminants that have leached from the soils; and
(3-31-22)
v. Other complete or
potentially complete routes of exposure; (3-31-22)
e. Evaluate the potential for exposure to:
(3-31-22)
i. Adult and child residential
receptors; (3-31-22)
ii. Adult
construction and utility workers; (3-31-22)
iii. Aquatic life; (3-31-22)
iv. Recreational receptors; and
(3-31-22)
v. Other relevant
potentially exposed receptors; (3-31-22)
f. Evaluate the potential for use of impacted
ground water for ingestion based on: (3-31-22)
i. The current and historical use of the
ground water for drinking water or irrigation; (3-31-22)
ii. The location and approved use of existing
ground water wells in a one half (½) mile radius from the contaminated
site at the release point; (3-31-22)
iii. The degree of hydraulic connectivity
between the impacted ground water and other ground water bearing zones or
surface water; and (3-31-22)
iv.
The location of delineated source water protection areas for public drinking
water systems. (3-31-22)
Disclaimer: These regulations may not be the most recent version. Idaho may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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