USGS - Pontchartrain Geochemistry - Data Sources and Locations

Lake Pontchartrain Basin: Bottom Sediments and Related Environmental Resources

Database Structure and Development (cont.)

Data Sources and Locations

The database in appendix D contains data from the sources and sponsoring agencies listed below in table 7. See table B4 for full references or source data.

Table 7. List of sediment data sources and sponsoring agencies.

Source	Agency/Organization
Byrne and DeLeon, 1986	University of New Orleans (UNO) / U.S. Army Corps of Engineers (USACE)
Byrne and DeLeon, 1987	University of New Orleans (UNO) / Louisiana Department of Environmental Quality (LDEQ)
Childers, 1985	Southeastern Louisiana University / Louisiana Department of Natural Resources- Coastal Zone Management Division (LDNR-CZMD)
Crocker, 1988	University of New Orleans (UNO)
Demcheck and others, 1996	U.S. Geological Survey (USGS)
Dunbar and others, 1995	U.S. Army Corps of Engineers (USACE)
Ferrario and others, 1985	University of New Orleans (UNO) / U.S. Army Corps of Engineers (USACE)
Flocks, 1998	U.S. Geological Survey (USGS)
Flowers, G.C., 1987 (unpublished)	Tulane University Department of Geology
Landrum, 1994 (see also Landrum, 1995)	Louisiana Department of Environmental Quality (LDEQ)
LDEQ, 1989	Louisiana Department of Environmental Quality- Office of Water Resources- Water Pollution Control Division (LDEQ-OWR-WPCD)
Macauley and Summers, 1998	U.S. Environmental Protection Agency (USEPA)
Marot, M., and Holmes, C.W., in review	U.S. Geological Survey (USGS)
McFall and others, 1985	University of New Orleans (UNO) / U.S. Army Corps of Engineers (USACE)
Roberts, 1981	Louisiana State University (LSU)
Sarkar, 1995	Tulane University Department of Geology
Schurtz and St. Pé, 1984	Louisiana Department of Environmental Quality (LDEQ)
Sikora and Sikora, 1982	U.S. Army Corps of Engineers (USACE)
Tarver and Dugas, 1973	Louisiana Wildlife and Fisheries Commission
Tarver and Savoie, 1976	Louisiana Wildlife and Fisheries Commission
Voyksner, 1985	Louisiana Department of Environmental Quality (LDEQ)

Figure 4 gives the locations of sediment samples from the sources in the database (appendixes C and D). A few additional sources were identified in library searches but have not been entered into the database because of limited contributions to existing information or special problems like insufficient location data.

(click on image for a larger view)

Figure 4. Map showing sample locations by source

The area code index map (fig. 5) provides geographical names for specific parts of Lake Pontchartrain and other waterways.

(click on image for a larger view, code descriptions, and opportunity to download GIS layer)

Figure 5. Map showing areas in "AREA_CODE" field

A numerical index grid (fig. 6) is included in the database (appendixes C and D) for analysis purposes. This index provides a convenient way to search on data from specific localities covered by the database. Sorting of the sediment data in spreadsheet form by grid number and specific chemical parameters has been used to compare group data from independent sources for specific local areas as a part of data quality screening. Indexing may be helpful when the presently available sediment data are combined with other information, such as biological data or toxicity measurements.

(click on image for a larger view and opportunity to download GIS layer)

Figure 6. Map showing numbered grid squares in "AREA_CD_SQ" field

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