Naturally occurring background definition

Naturally occurring background means the quality of individual media in the vicinity of a discharge of a hazardous sub- stance or environmental pollution that has not been affected by a hazardous substance discharge or environmental pollution.
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Examples of Naturally occurring background in a sentence

  • Naturally occurring background levels for PID monitoring range between 0.0 ppm and 2.0 ppm but can also fluctuate due to ambient conditions (e.g. nearby traffic exhaust, high humidity, excess moisture).

  • Naturally occurring, background concentrations of metals in soil exceed risk-based screening levels in some cases.

  • Naturally occurring background radiation is the ionising radiation within the environment that people are continuously exposed to.

  • Naturally occurring background radiation levels are typically low and would only present a radiological hazard when in concentrated form.

  • Naturally occurring background concentrations of metals were established in a manner consistent with national guidance EPA has published for other pollutants (Buck et al., 2000).

  • The background con- centration for a substance in soil shall be determined using a depart- ment−approved and appropriate method.Note: Naturally occurring background concentrations of arsenic in soil, for exam- ple, may be higher than the residual contaminant level for arsenic listed in Table 2.

  • EPA Response: Naturally occurring background and other non- landfill sources may contribute to the elevated inorganic groundwater concentrations, but the data also indicates the landfill as the elevated source of inorganic compounds.

  • Naturally occurring background concentrations for metals may be eliminated from further consideration as COPCs, provided that on-site maximum concentrations of potentially site-related constituents are comparable to (equal to or less than) background levels.

  • Naturally occurring background pollutant concentrations for waters which exceed the otherwise applicable concentrations established pursuant to 314 CMR 4.05(5)(e)1.b. or c.

  • Naturally occurring background loading is a type of nonpoint source.

Related to Naturally occurring background

  • Co-occurring disorder (COD) means any combination of mental health symptoms and substance use disorder symptoms or diagnoses that affect a consumer and are typically determined by the current Diagnostic and Statistical Manual of Mental Disorders.

  • Biologically-based mental illness means schizophrenia, schizoaffective disorder, major depressive disorder, bipolar disorder, paranoia and other psychotic disorders, obsessive-compulsive disorder, and panic disorder, as these terms are defined in the most recent edition of the diagnostic and statistical manual of mental disorders published by the American Psychiatric Association.

  • Autism spectrum disorders means any of the pervasive developmental disorders as defined by the Diagnostic and Statistical Manual of Mental Disorders, 4th edition, published by the American Psychiatric Association, including autistic disorder, Asperger's disorder and pervasive developmental disorder not otherwise specified.

  • manoeuvring area means that part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, excluding aprons;

  • Volatile organic compounds or “VOC” means any compound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, which participates in atmospheric photochemical reactions.

  • Autism spectrum disorder means a neuro-developmental condition typically appearing in the first three years of life that significantly affects a person's ability to communicate, understand relationships and relate to others, and is frequently associated with unusual or stereotypical rituals or behaviours.

  • Industrial Activity means activities subject to NPDES Industrial Permits as defined in 40 CFR, Section 122.26 (b)(14).