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| Publications—Data Series |
U.S. GEOLOGICAL SURVEY
Data Series 143
The U.S. Geological Survey (USGS), in collaboration with the Louisiana Department of Environmental Quality, monitored bacteriological quality of water at 22 sites in and around Lake Pontchartrain, La., for three consecutive weeks beginning September 13, 2005, following hurricanes Katrina and Rita and the associated flooding. Samples were collected and analyzed by USGS personnel from the USGS Louisiana Water Science Center and the USGS Ohio Water Microbiology Laboratory. Fecal-indicator bacteria (Escherichia coli, enterococci, and fecal coliform) concentrations ranged from the detection limit to 36,000 colony-forming units per 100 milliliters. Data are presented in tabular form and as plots of data in the context of available historical data and water-quality standards and criteria for each site sampled. Quality-control data were reviewed to ensure that methods performed as expected in a mobile laboratory setting.
Abstract
Introduction
Description of Study Area
Methods of Study
Site Selection and Description
Sample Collection
Onsite Physical and Chemical Measurements
Bacteriological Analyses
Quality-Control and Quality-Assurance Practices
Water-Quality Characteristics
Acknowledgments
References Cited
1. Index map showing general location of the study area in and around Lake Pontchartrain, La.
2. Map showing location of data-collection sites in the Lake Pontchartrain, La., area. (Graphical displays of bacteria-concentration distributions may be viewed by clicking on the map near each site.)
1. Site descriptions.
2. Onsite physical and chemical water-quality measurements at a 1-m depth at 22 sites in and around Lake Pontchartrain La.
3. Bacteriological data from the Lake Pontchartrain area, Louisiana.
4. U.S. Environmental Protection Agency (2004) criteria for recreational waters.
5. Summary of quality-control analyses for bacteriological water-quality sampling in the Lake Pontchartrain area, Louisiana.
This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.
View the text and tables in PDF (375 kb)
View figure 2 (area map and graphs of bacteria-concentration distribution) in PDF (2.0 MB)
Note: All data displayed in the graphs in figure 2 can be found in tables 1 through 4 in the main part of the report.
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For more information about USGS activities in Louisiana contact:
Director
USGS Louisiana Water Science Center
3535 S. Sherwood Forest Blvd., Suite 120
Baton Rouge, LA 70816
Telephone: (225) 298-5481
Fax: (225) 298-5490
or access the USGS Louisiana Water Science Center home page at: http://la.water.usgs.gov/.