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 58.01.24.010 - DEFINITIONS

Current through August 31, 2023
For the purpose of the rules contained in IDAPA 58.01.24,
				"Standards and Procedures for Application of Risk Based Corrective Action at
				Petroleum Release Sites," the following definitions apply: (3-31-22)
01.
Acceptable Target Hazard
			 Index
. The summation of the hazard quotients of all chemicals and routes
			 of exposure to which a receptor is exposed and equal to a value of one (1). If
			 the initial value exceeds one (1), further evaluation, including individual
			 organs, can be completed. (3-31-22)
02.
Acceptable Target Hazard
			 Quotient
. A hazard quotient of 1 for a specified receptor when applied
			 to individual chemicals. (3-31-22)
03.
Acceptable Target Risk
			 Level
. Acceptable risk level for human exposure to carcinogens. For
			 exposure to individual carcinogens a lifetime excess cancer risk of less than
			 or equal to one per one million (1 E-6) for a receptor at a reasonable maximum
			 exposure. For combined exposure to all carcinogens and routes of exposure, a
			 lifetime excess cancer risk of less than or equal to one per one hundred
			 thousand (1 E-5) for a receptor at a reasonable maximum exposure.
			 (3-31-22)
04.
Activity and
			 Use Limitations
. Restrictions or obligations, with respect to real
			 property, created by an environmental covenant. Activity and use limitations
			 may include, but are not limited to, land use controls, activity and use
			 restrictions, environmental monitoring requirements, and site access and
			 security measures. Also known as institutional controls. (3-31-22)
05.
Background
. Media specific
			 concentration of a chemical that is consistently present in the environment in
			 the vicinity of a site which is the result of human activities unrelated to
			 release(s) from that site under investigation. (3-31-22)
06.
Board
. The Idaho Board of
			 Environmental Quality. (3-31-22)
07.
Corrective Action Plan
. A
			 document, subject to approval by the Department, which describes the actions
			 and measures that will be implemented to ensure that adequate protection of
			 human health and the environment is achieved and maintained. A corrective
			 action plan also describes the applicable remediation standards. Also may be
			 known as a risk management plan or a remediation workplan. (3-31-22)
08.
Delineated Source Water Protection
			 Area
. The physical area around a public drinking water supply well or
			 surface water intake identified in an approved Department source water
			 assessment that contributes water to a well (the zone of contribution). The
			 size and shape of the delineated source water area depend on the delineation
			 method and site specific factors. The area may be mapped as a one thousand
			 (1000) ft. fixed radius around the well (transient public water systems) or
			 divided into three (3), six (6), and ten (10) year time of travel zones (e.g.
			 zones indicating the number of years necessary for a particle of water to reach
			 a well or surface water intake). For the purposes of these rules, where ground
			 water time of travel zones have been delineated, the three (3) year time of
			 travel zone shall apply. Where surface water systems have been delineated, this
			 area includes a five hundred (500) ft. buffer around a lake or reservoir, or a
			 five hundred (500) ft. buffer along the four (4) hour upstream time of travel
			 of streams. See the Idaho Source Water Assessment Plan. (3-31-22)
09.
Department
. The Idaho
			 Department of Environmental Quality. (3-31-22)
10.
Environmental Covenant
. As
			 defined in the Uniform Environmental Covenant Act (UECA), Chapter 30, Title 55,
			 Idaho Code, an environmental covenant is a servitude arising under an
			 environmental response project that imposes activity and use limitations.
			 (3-31-22)
11.
Exposure Point
			 Concentration
. The average concentration of a chemical to which
			 receptors are exposed over a specified duration within a specified geographical
			 area. The exposure point concentration is typically a conservative estimate of
			 the mean. Also referred to as the representative concentration.
			 (3-31-22)
12.
Hazard
			 Quotient
. The ratio of a dose of a single chemical over a specified time
			 period to a reference dose for that chemical derived for a similar exposure
			 period. (3-31-22)
13.
Method
			 Detection Limit
. The minimum concentration of a substance that can be
			 reported with ninety-nine percent (99%) confidence is greater than zero. Method
			 detection limits can be operator, method, laboratory, and matrix specific.
			 (3-31-22)
14.
Operator
. Any person presently or who was at any time during a
			 release in control of, or responsible for, the daily operation of the petroleum
			 storage tank (PST) system. (3-31-22)
15.
Owner
. Any person who owns
			 or owned a PST system any time during a release and the current owner of the
			 property where the PST system is or was located. (3-31-22)
16.
Person
. An individual,
			 public or private corporation, partnership, association, firm, joint stock
			 company, joint venture, trust, estate, state, municipality, commission,
			 political subdivision of the state, state or federal agency, department or
			 instrumentality, special district, interstate body, or any legal entity which
			 is recognized by law as the subject of rights and duties. (3-31-22)
17.
Petroleum
. Crude oil or any
			 fraction thereof that is liquid at standard conditions of temperature and
			 pressure (sixty (60) degrees Fahrenheit and fourteen and seven-tenths (14.7)
			 pounds per square inch absolute). This includes petroleum-based substances
			 comprised of a complex blend of hydrocarbons derived from crude oil through
			 processes of separation, conversion, upgrading, and finishing, such as motor
			 fuels, jet fuels, distillate fuel oils, residual fuel oils, and lubricants.
			 (3-31-22)
18.
Petroleum
			 Storage Tank (PST) System
. Any one (1) or combination of storage tanks
			 or other containers, including pipes connected thereto, dispensing equipment,
			 and other connected ancillary equipment, and stationary or mobile equipment,
			 that contains petroleum or a mixture of petroleum with de minimis quantities of
			 other regulated substances. (3-31-22)
19.
Practical Quantitation
			 Limit
. The lowest concentration of a chemical that can be reliably
			 quantified among laboratories within specified limits of precision and accuracy
			 for a specific laboratory analytical method during routine laboratory operating
			 conditions. Specified limits of precision and accuracy are the criteria listed
			 in the calibration specifications or quality control specifications of an
			 analytical method. Practical quantitation limits can be operator, method,
			 laboratory, and matrix specific. (3-31-22)
20.
Reasonable Maximum Exposure
.
			 The highest exposure that can be reasonably expected to occur for a human or
			 other living organism at a site under current and potential future site use.
			 (3-31-22)
21.
Reference
			 Dose
. For chronic or long-term exposures an estimate of a daily exposure
			 level to a chemical for the human population, including sensitive
			 subpopulations, that is likely to be without an appreciable risk of deleterious
			 noncarcinogenic effects during a lifetime, expressed in units of milligrams per
			 kilogram body weight per day. (3-31-22)
22.
Release
. Any spilling,
			 leaking, emitting, discharging, escaping, leaching, or disposing from a PST
			 into soil, ground water, or surface water. (3-31-22)
23.
Remediation Standard
. A
			 media specific concentration which, when attained, is considered to provide
			 adequate protection of human health and the environment. (3-31-22)
24.
Residential Use
. Residential
			 use means land uses which include residential or sensitive populations.
			 (3-31-22)
25.
Risk Based
			 Concentration
.The residual media specific concentration of a chemical
			 that is determined to be protective of human health and the environment under
			 specified exposure conditions. (3-31-22)
26.
Risk Evaluation
. The process
			 used to determine the probability of an adverse effect due to the presence of a
			 chemical. A risk evaluation includes development of a site conceptual model,
			 identification of the chemicals present in environmental media, assessment of
			 exposure and exposure pathways, assessment of the toxicity of the chemicals
			 present, characterization of human risks, and characterization of impacts or
			 risks to the environment. (3-31-22)
27.
Screening Level
. A media
			 specific concentration which, based on specified levels of risk or hazard,
			 exposure pathways and routes of exposure, expected land use, and exposure
			 factors, can be used to assess the need for additional investigation or
			 corrective action. (3-31-22)
28.
Slope Factor
. A plausible upper-bound estimate of the probability
			 of an individual developing cancer as a result of a lifetime of exposure to a
			 particular level of a potential carcinogen. It is expressed as the probability
			 of a response per unit intake of a chemical over a lifetime.
			 (3-31-22)
29.
Uniform
			 Environmental Covenant Act (UECA)
. UECA is found in Chapter 30, Title
			 55, Idaho Code. UECA provides a statutory mechanism for creating, modifying,
			 enforcing and terminating environmental covenants. (3-31-22)