A nutrient-rich lake -- usually
shallow, "green" and with limited
oxygen in the bottom layer of
water.

Cooling surface waters, activated
by wind action, sink to mix with
lower levels of water. As in
spring turnover, all water is now
at the same temperature.

An investigation to determine
which course of action should be
taken, based on which is the most
cost effective. Often preceded by
a remedial investigation.

A group of bacteria found in the intestinal tract of humans and
animals, and also found in soil. While harmless in themselves,
coliform bacteria are commonly used as indicators of the presence
of pathogenic organisms and other disease-causing bacteria, such
as those that cause typhoid, dysentery, hepatitis A and cholera.
Measured in number of bacteria per 100 milliliters of water.
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Failing septic systems and runoff from feedlots are common
sources of fecal coliform in water samples.

A lot or building or a group of
lots or buildings used for the
confined feeding, breeding or
holding of animals. This
definition includes areas
specifically designed for
confinement in which manure may
accumulate or any area where the
concentration of animals is such
that a vegetative cover cannot be
maintained. Lots used to feed and
raise poultry are considered to be
feedlots. Pastures are not animal
feedlots.

Fuels derived from organic
substances such as coal, petroleum
and natural gas.

Gallons per minute.

The maximum animal stocking rate
possible without inducing damage
to vegetation, water or related
resources.

An increase in the earth's
temperature resulting from the
accumulation of carbon dioxide and
water vapor in the atmosphere.
Excess amounts of these gases trap
heat in the upper atmosphere and
reflect it back to earth.

Underground water in an aquifer,
used for drinking water in 75
percent of Minnesota households.
The subsurface water supply in the
saturated zone below the level of
the water table.