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USGS Study in Austin Determines
PAH Concentration in Parking Lot Runoff
![Parking lot study](/peth04/20041014213216im_/http://tx.usgs.gov/images/parkinglots.gif)
Edwards Aquifer & Barton Springs
![Edwards aquifer](/peth04/20041014213216im_/http://tx.usgs.gov/images/EdwardsAq.jpg)
Current data, studies, and publications
including water, biology, & geological maps.
Barton Springs Groundwater Characterization Project
Biology & Environment
![Texas sea turtle](/peth04/20041014213216im_/http://tx.usgs.gov/images/SeaTurtle.jpg)
CERC Biological Research Projects in Texas
TX Gulf Coast |
Big Bend |
Big Thicket Prsv
Houston |
US/Mexico Border
Galveston Bay Wetland Inventory
![Aerial photograph of Galveston Bay](/peth04/20041014213216im_/http://tx.usgs.gov/images/Galveston.jpg)
Subsidence in the Houston-Galveston Region
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