Media Advisory: Briefing on Potentially Toxic Polycyclic Aromatic Hydrocarbons in Urban Lakes Across the Nation

What:	USGS will brief Congress, the media and the public on increasing levels of polycyclic aromatic hydrocarbons (PAHs) in urban lakes studied in 40 cities across the nation.
Why:	PAHs are probable human carcinogens and toxic to fish and other aquatic life. USGS findings show that concentrations have been increasing in urban lakes in recent decades. Findings also show that coal-tar-based pavement sealant is a much larger source of PAHs to urban lakes than previously identified sources, such as vehicle emissions, used motor oil, and tire particles.
Who:	Dr. Barbara Mahler, USGS Research Hydrologist, Austin, TX
Where:	H 137 Capitol Building, Washington D.C
When:	Thursday, April 14, 10:30 a.m. to Noon
Sponsors:	Rep. Lloyd Doggett (D-Texas) Environmental and Energy Study Institute Water Environment Federation USGS National Water-Quality Assessment Program

The briefing is free and open to the public. No RSVP required.

For more information, contact Laura Parsons at lparsons@eesi.org or (202) 662-1884.

USGS Newsroom

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Parameter	Value	Description
Magnitude	mb	The magnitude for the event.
Longitude	° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	km	Depth of the event in kilometers.
Place		Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	1970-01-01 00:00:00	Time when the event occurred. UTC/GMT
Updated	1970-01-01 00:00:00	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt		The total number of felt reports
CDI		The maximum reported intensity for the event.
MMI		The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status		Indicates whether the event has been reviewed by a human.
Tsunami		This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG		A number describing how significant the event is. Larger numbers indicate a more significant event.
Network		The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources		A comma-separated list of network contributors.
Number of Stations Used		The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance		Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap		The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type		The method or algorithm used to calculate the preferred magnitude for the event.
Event Type		Type of seismic event.
Event ID		Id of event.
Event Code		An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS		A comma-separated list of event ids that are associated to an event.

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Media Advisory: Briefing on Potentially Toxic Polycyclic Aromatic Hydrocarbons in Urban Lakes Across the Nation

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