The sum of exposure from each microenvironment where a person
spends time. Examples of microenvironments include home, car,
office, etc. Personal exposure can be measured using a sampling
device worn by a study participant throughout a normal day.

"Turbidity in water is caused by suspended matter, such as clay, silt, finely
divided organic and inorganic matter, soluble colored organic compounds, and
plankton and other microscopic organisms... Turbidity is an expression of the
optical property that causes light to be scattered and absorbed rather than
transmitted in straight lines through the sample."¹<br><br>

Mercury is a highly toxic element that is found both naturally and as
an introduced contaminant in the environment. Although concentrations in
water are very low, mercury accumulates through the aquatic food chain,
resulting in high concentrations in fish that can threaten the health of people
and wildlife. It is measured in units of nanograms per liter (ng/L) in water and
milligrams per kilogram (mg/Kg) in fish. For more information, see <a
href="http://

Polychlorinated biphenyls (PCBs) are a class of industrial chemicals
manufactured from 1930 to 1977 for use in electrical and hydraulic products.
PCBs are still present in the environment because of their persistence and
accumulation at higher concentrations up the food chain (bioaccumulation), but
have been showing a trend of decreasing concentrations (<a href="http://
www.epa.gov/opptintr/pbt/pcbs.htm">EPA Persistent

The clarity of stream water (in units of centimeters) as measured
in a Citizen Stream Monitoring Program transparency tube. A
greater transparency reading in centimeters reflects higher
water clarity. Stream water clarity is an indicator of how much
sediment, algae, and other materials are suspended in the water.
<br>
<br>
The transparency tube is a clear, 60 cm-long tube with a colored
disk on the bottom for measuring the depth at which the disk is
visible. To measure water clarity, the tube is filled with

A plan for stormwater discharge that includes erosion
prevention measures and sediment controls that, when
implemented, will decrease soil erosion on a parcel of land
decrease off-site nonpoint pollution.

RCRA was enacted by Congress in 1976, as an amendment to the
1965 Solid Waste Disposal Act. The goals of RCRA are to:

Protect human health and the environment from the hazards posed
by waste disposal

Conserve energy and natural resources through waste recycling
and recovery

Reduce or eliminate, as expeditiously as possible, the amount
of waste generated, including hazardous waste

Ensure that wastes are managed in a manner that is protective
of human health and the environment.

Sites where RCRA (Resource Conservation and Recovery Act)
hazardous waste generators had an actual or potential release
requiring investigation and/or cleanup. These generators fall
into the very small, small and large quantity generator classes.

A hazardous waste generator that generates over 1,000 kg (2,200
lbs.) per month of hazardous waste. LQGs must comply with
general federal and state requirements for managing hazardous
waste. LQGs need an EPA identification number that is used to
monitor and track hazardous waste activities.

A hazardous waste generator that generates between 220 and
2,200 lbs (100 and 1,000 kg) per month of hazardous waste.
SQGs must comply with general federal and state requirements
for managing hazardous waste. SQGs need an EPA identification
number that is used to monitor and track hazardous waste
activities.