ASARCO HAYDEN SMELTER SITE
(a/k/a ASARCO INCORPORATED HAYDEN PLANT)
HAYDEN, GILA COUNTY, ARIZONA EPA FACILITY ID: AZD008397127
September 30, 2002
Prepared by:
Arizona Department of Health Services
Office of Environmental Health
Environmental Health Consultation Services
Under a Cooperative Agreement with the
Agency for Toxic Substances and Disease Registry
the minimum concentrations that must be accurately and precisely
measured by the laboratory and/or specified in the quality assurance plan.
Dose:
the amount of a contamination that is absorbed or deposited in the human
body for an increment of time. A total dose is the sum of doses received
by a person from a contaminant in a given interval resulting from
interaction with all environmental media that contain the contaminant.
Exposure:
an event that occurs when there is contact at a boundary between a human
being and the environment with a contaminant for a specific
concentration for an interval of time. The units of exposure are
concentration multiplied by time( i.e., parts per million times number of
days.)
Exposure Pathway:
the means by which a contaminant is introduced into the body i.e. dermal,
inhalation, or ingestion. Also see route of exposure.
Maximum Contaminant Level (MCL):
enforceable drinking water standards that are protective of public health
to the extent feasible.
Milligram Per Kilogram:
a common basis of reporting concentrations in soils. One milligram per
kilogram equals one part per million.
Minimal Risk Level (MRL):
an estimate of daily exposure of a human being to a chemical (in
milligrams per kilogram per day) that is likely to be without an
appreciable risk of adverse non cancerous health effects over a specified
duration of exposure.
Particulate:
small, discrete, solid or liquid bodies, especially those suspended in a
liquid or air medium.
Quality Assurance:
a planned system of activities whose purpose is to provide assurance of
the reliability and defensibility of the data.
Quality Control(QC):
a routine application of procedures for controlling the monitoring process.
QC is the responsibility of all those performing hands-on operations in
the filed and in the laboratory.
Route of Exposure:
means by which the contaminant moves through the environment by a
transporting medium such as air, soil, or water. Also see exposure
pathway.
Soil Remediation Levels:
health-based soil screening levels. SRLs protect against toxic doses of systemic toxicants.
