In cooperation with the Southern
Division
Naval Facilities Engineering Command
Chemical Data for Bottom Sediment in Mountain Creek Lake, Dallas, Texas, 1999–2000
By Jennifer T. Wilson
U.S. Geological Survey
Open-File Report 02–053
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Contents
Abstract
Introduction
Purpose and Scope
Study Area
Acknowledgments
Chemical Data
Collection of Bottom-Sediment Samples
Analytical Methods and Results
Summary
References Cited
Figures
| 1. | Map showing location of the study area and approximate sampling locations in Mountain Creek Lake, Dallas, Texas |
| 2. | Map showing chromium concentrations in surficial sediment samples collected during Phase III at Mountain Creek Lake, Dallas, Texas |
| 3. | Graphs showing chromium concentrations relative to sediment deposition date in gravity core samples collected during Phase III at Mountain Creek Lake, Dallas, Texas |
| 4. | Map showing total polychlorinated biphenyl (PCB) concentrations in surficial sediment samples collected during Phase III at Mountain Creek Lake, Dallas, Texas |
| 5. | Graphs showing total polychlorinated biphenyl (PCB) concentrations relative to sediment deposition date in gravity core samples collected during Phase III at Mountain Creek Lake, Dallas, Texas |
| 6. | Map showing total polycyclic aromatic hydrocarbon (PAH) concentrations in surficial sediment samples collected during Phase III at Mountain Creek Lake, Dallas, Texas |
| 7. | Graphs showing total polycyclic aromatic hydrocarbon (PAH) concentrations relative to sediment deposition date in gravity core samples collected during Phase III at Mountain Creek Lake, Dallas, Texas |
Tables
| 1. | Thickness of lacustrine sediment samples in cores collected from Mountain Creek Lake, Dallas, Texas |
| 2. | Description of gravity cores collected from Mountain Creek Lake, Dallas, Texas |
| 3. | Box cores—Major and trace element concentrations in bottom sediments |
| 4. | Box cores—Organochlorine pesticide and polychlorinated biphenyl (PCB) concentrations in bottom sediments |
| 5. | Box cores—Polycyclic aromatic hydrocarbon (PAH) concentrations in bottom sediments |
| 6. | Box cores—Grain size in bottom sediments |
| 7. | Gravity cores—Major and trace element concentrations in bottom sediments |
| 8. | Gravity cores—Organochlorine pesticide and polychlorinated biphenyl (PCB) concentrations in bottom sediments |
| 9. | Gravity cores—Polycyclic aromatic hydrocarbon (PAH) concentrations in bottom sediments |
| 10. | Gravity cores—Grain size in bottom sediments |
| 11. | Gravity cores—Cesium-137 (137Cs) activity in bottom sediments |
| 12. | Laboratory quality-control samples for major and trace element analyses |
| 13. | Laboratory quality-control samples for organochlorine pesticide and polychlorinated biphenyl (PCB) analyses |
| 14. | Laboratory quality-control samples for polycyclic aromatic hydrocarbon (PAH) analyses |
Abstract
Mountain Creek Lake is a reservoir adjacent to the Naval Weapons Industrial Reserve Plant and the former Naval Air Station in Dallas, Texas. The U.S. Geological Survey began studies of water, sediment, and biota in the reservoir in 1994 after a Resource Conservation and Recovery Act Facility Investigation detected concentrations of organic chemicals on both facilities. Additional reservoir bottom sediment samples were collected during December 1999–January 2000 at the request of the Southern Division Naval Facilities Engineering Command to further define the occurrence and distribution of selected constituents and to supplement available data. The U.S. Geological Survey National Water Quality Laboratory analyzed bottom-sediment samples from 16 box cores and 5 gravity cores for major and trace elements, organochlorine pesticides, polychlorinated biphenyls, polycyclic aromatic hydrocarbons, grain size, and cesium-137.
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