Screenings and Preliminary Assessments
PRELIMINARY ASSESSMENT: SOURCE AREAS AND WASTE CHARACTERISTICS
This section covers past, present, known, and potential sources of
hazardous substances at the site. These comprise areas with
documented releases of hazardous substances, where there is a threat
of release, or where hazardous substances have been stored or
A source can mean any building, structure, installation, equipment,
pipe or pipeline (including any pipe into a sewer or publicly owned
treatment works), well, pit, pond, lagoon, impoundment, ditch,
landfill, storage container, above-ground or underground storage
tank, motor vehicle, or any area where a hazardous substance has
been deposited, stored, disposed of, placed, or otherwise come to be
located, and where a release has occurred or where there is a threat
of a release.
This section includes areas where hazardous substances may be
present but do not pose a threat of release to the environment. All
areas where hazardous substances are handled should be listed.
Discussion of permitted or authorized releases belong in the PA’s
Regulatory History section. A permitted or authorized release is a
release from an active facility that is subject to and in
substantial compliance with a current and legally enforceable permit
issued by an authorized public agency [Oregon Administrative Rule 340-122-115]. Note that
deposition, accumulation, or migration of substances resulting from
an otherwise permitted or authorized release is excluded from the
definition of a permitted or authorized release [OAR 340-122-073].
Where detailed information is not available, such deficiencies
should be noted, and estimates used for source containment, size,
and quantity/types of contaminants present. This section will also
identify hazardous substances that have not been handled in the
hazardous substance release areas listed above. Describe how the
facility uses, treats, disposes of, or recycles these substances.
For each source, where a release or a threat of a release exists,
- Name and location of source
- Type of source - landfill, surface impoundment,
container, storage tank, contaminated soil, pile, etc. A landfill is
an engineered hole in the ground into which hazardous substances
have been disposed by backfilling or by contemporaneous soil
deposition that covers wastes from view. A surface impoundment is a
topographic depression, excavation, or diked area, formed from
earthen materials (lined or unlined) and designed to hold wastes
containing free liquids. Drums are portable containers that hold a
standard 55-gallon volume of hazardous substances. Tanks and
Non-Drum Containers are other portable or stationary devices used to
contain accumulated wastes. A pile is any non-containerized,
above-ground accumulation of solid, non-flowing wastes, including
- Current use and length of use - active, inactive,
documented clean-closed, undocumented clean-closed, frequency and
dates of use, etc.
- Permits addressing source (if applicable).
- Type and condition of containment - Is the source lined
or unlined? Is it breached or unbreached, is there a cap or cover,
and if so, what type? Are containment structures maintained, and if
so, at what intervals does this maintenance occur?
- Name and quantity of hazardous substances and contaminated
media found in each source, including past and current
disposals. If actual quantities are unknown, use estimates based on
areal extent or volume (from dimensions of the release area). If
available, provide documentation in the form of analytical results
- Documented releases of hazardous substances - A release
is defined as any spilling, leaking, pumping, pouring, emitting,
emptying, discharging, injecting, escaping, leaching, dumping, or
disposing into the environment. Releases include the abandonment or
discarding of barrels, containers, and other closed receptacles
containing a hazardous substance. Releases exclude the following:
- Releases that result in exposure to a person solely within a
workplace with respect to a claim that the person may assert
against the person's employer under ORS chapter 656 (i.e., OSHA).
- Emissions from the engine exhaust of a motor vehicle,
rolling stock, aircraft, vessel (watercraft), or pipeline
pumping station engine.
- Any release of source, by product or special nuclear
material from a nuclear incident, as those terms are defined in
the Atomic Energy Act of 1954, as amended, or any removal,
remedial action, or release of source, by-product or special
nuclear material from any processing site designated under
section 102(a)(1) or 302(a) of the Uranium Mill Tailings
Radiation Control Act of 1978.
- The normal application of fertilizer.
A release can be verified through visual or analytical evidence,
facility documentation, or owner/operator admission.
- Pathways affected or potentially affected - Is the source
contributing to contaminant migration? A pathway is the route by
which a hazardous substance can migrate to a target or receptor.
Four pathways are used to evaluate a site: 1) groundwater; 2)
surface water; 3) air; and 4) direct contact (soil).
- Disposal history (both on- and off-site) for each waste
type, including names of companies contracted with for disposal, and
locations of disposal.
- Accessibility to source by the public and on-site
workers, including whether the source is fenced, the extent of
fencing, and type of security present.