Contaminated and Hazardous
Waste Site Management
Aerobes: organisms that require the presence of molecular oxygen (O2) for their
Anaerobes: Organisms for which the presence of molecular oxygen is toxic. These
organisms derive the oxygen needed for cell synthesis from chemical compounds.
Well: A well constructed for the objective of undertaking observations such as
water levels, pressure readings and groundwater quality.
To cause to become obstructed or closed and thus prevent passage either into or
Partition Coefficient (Kow): A coefficient representing the ratio of the solubility
of a compound in octanol (a non-polar solvent) to its solubility in water (a polar
solvent). The higher the Kow, the more non-polar the compound. Log Kow is generally
used as a relative indicator of the tendency of an organic compound to adsorb
to soil. Log Kow values are generally inversely related to aqueous solubility
and directly proportional to molecular weight.
Treatment System: Refers to the unit operations used to treat (i.e. condense,
collect, or destroy) contaminants in the purge gas from the thermal desorber.
Plate: A flow measurement device for liquids or gases that uses a restrictive
orifice plate consisting of a machined hole that produces a jet effect. Typically
the orifice meter consists of a thin plate with a square-edged, concentric and
circular orifice. The pressure drop of the jet effect across the orifice is proportional
to the flow rate. The pressure drop can be measured with a manometer or differential
Offset: Seismic reflection technique employing optimum window.
Window: The best shot-geophone separation for obtaining reflections from a given
interface. Chosen to lie between the earlier refractions and the later surface
Contaminant or Compound: Substances containing carbon, with the exception of carbon
dioxide (CO2) and carbonates (e.g. calcium carbonate, CaCO3).
Site: A contaminated site whose owner cannot be found or who cannot be held responsible
for its clean-up.
Exposed bedrock or strata which projects through overlying unconsolidated sediments
Deposits: Stratified drift deposited by meltwater streams flowing away from melting
The layer of fragmented and unconsolidated material including loose soil, silt,
sand and gravel overlying bedrock, which has been either transported from elsewhere
or formed in place.
Runoff: That part of precipitation flowing overland to surface streams.
(redox): A chemical reaction consisting of two half-reactions; an oxidation reaction
in which a substance loses or donates electrons, and a reduction reaction in which
a substance gains or accepts electrons. Redox reactions are always coupled because
free electrons cannot exist in solution and electrons must be conserved.