Page 160 - California Stormwater Workshop Handouts

ATTACHMENT C

GLOSSARY

NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)
GENERAL PERMIT FOR STORM WATER DISCHARGES
ASSOCIATED WITH INDUSTRIAL ACTIVITIES
(GENERAL PERMIT)

Adoption Date April 1, 2014

Aerial Deposition
Total suspended particulate matter found in the atmosphere as solid particles or liquid
droplets. Chemical composition of particulates varies widely, depending on location and
time of year. Sources of airborne particulates include but are not limited to: dust,
emissions from industrial processes, combustion products from the burning of wood and
coal, combustion products associated with motor vehicle or non-road engine exhausts,
and reactions to gases in the atmosphere. Deposition is the act of these materials
being added to a landform.

Beneficial Uses
As defined in the California Water Code, beneficial uses of the waters of the state that
may be protected against quality degradation, include but are not limited to, domestic,
municipal, agricultural and industrial supply; power generation; recreation; aesthetic
enjoyment; navigation; and preservation and enhancement of fish, wildlife, and other
aquatic resources or preserves.

Best Available Technology Economically Achievable (BAT)
As defined by United States Environmental Protection Agency (U.S. EPA), BAT is a
technology-based standard established by the Clean Water Act (CWA) as the most
appropriate means available on a national basis for controlling the direct discharge of
toxic and nonconventional pollutants to navigable waters. The BAT effluent limitations
guidelines, in general, represent the best existing performance of treatment
technologies that are economically achievable within an industrial point source category
or subcategory.

Best Conventional Pollutant Control Technology (BCT)
As defined by U.S. EPA, BCT is a technology-based standard for the discharge from
existing industrial point sources of conventional pollutants including biochemical oxygen
demand (BOD), total suspended sediment (TSS), fecal coliform, pH, oil and grease.

Best Professional Judgment (BPJ)
The method used by permit writers to develop technology-based NPDES permits
conditions on a case-by-case basis using all reasonably available and relevant data.

Order 2014-0057-DWQ 1