General Glossary

Measured against a platinum-cobalt standard (PCU or Pt-Co units),
can give an indication of the relative amount of dissolved
organic matter in the water. High coloration, or "bog stain" as
it is referred to, is usually caused by runoff from wetlands or
forested lands. At high values, color may interfere with the
expected phosphorus - chlorophyll - Secchi relationship of a
lake. In general, values between 0-20 are considered clear, 21-50
are considered moderately colored, 51-100 are considered

The 8-character federal code identifying the Cataloguing Unit,
the smallest of the different hydrologic units. The coding is
hierarchical with a 2-character region, a 4-character subregion,
a 6-character accounting unit and an 8-character cataloguing
unit.

All trophic status rankings are conducted by ecoregion and
expressed as a percentile. In general, as trophic state
increases, moving from oligotrophy to eutrophy
(e.g., phosphorus and chlorophyll increase and Secchi
transparency decreases), percentile ranking decreases.

FS=Full Support<br>
MS=Full Support(marginal)<br>
PS=Partial-Support<br>
NS=Non-Support

An incombustible, chemical-resistant, fibrous mineral form of
impure magnesium silicate. Prolonged, inhalation of asbestos
can lead to asbestosis -- a chronic, progressive lung disease.

An increase in the Earth's temperature caused by human
activities, such as burning coal, oil and natural gas. This
releases carbon dioxide, methane, and other greenhouse gases
into
the atmosphere. Greenhouse gases form a blanket around the
Earth,
trapping heat and raising temperatures on the ground. This is
steadily changing our climate.

This indicates that a tank has a catchment basin or spill bucket
that is sealed around the fill pipe to prevent spills that may
occur when the delivery hose is disconnected from the fill pipe.
This basin or bucket must be able to contain the contents of the
delivery hose.

A greenhouse gas is a gas, either naturally occurring or
man-made, that absorbs heat in the atmosphere. Some greenhouse
gases occur naturally in the atmosphere, while others result
from
human activities. Naturally occuring greenhouse gases include
water vapor, carbon dioxide, methane, nitrous oxide, and ozone.
Certain human activities, however, add to the levels of most of
these naturally occurring gases:
- Carbon dioxide is released to the atmosphere when solid waste,
fossil fuels (oil, natural gas, and coal), and wood and wood

This is a device that is installed in the fill pipe drop tube of
an underground storage tank. It is usually set at 95 percent of
tank capacity. When product reaches that level, a float arm
shuts off the fill pipe to additional product. It is also called
a "flapper valve".

This is a periodic precision or integrity test for some suction
piping systems used to determine if piping is leaking.