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![A view of the berm of the Normal Municipal Landfill, OK, and the area that
overlies the leachate plume](photos/norman/norman1_sm.jpg)
A view of the berm of the Normal Municipal Landfill, OK, and the area that
overlies the leachate plume
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![Map of the study area showing well transect location and ground-water flow direction](photos/norman/norman2_sm.gif)
Map of the study area showing well transect location and ground-water flow direction
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![Collecting pore waters from a core to determine natural attenuation rates](photos/norman/norman4_sm.jpg)
Collecting pore waters from a core to determine natural attenuation rates
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![USGS scientist using a syringe to withdraw water for analysis of geochemical parameters](photos/norman/norman5_sm.jpg)
USGS scientist using a syringe to withdraw water for analysis of geochemical parameters
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![Passive-diffusion samples--peepers--are driven into a wetland to observe the geochemistry of the leachate plume's discharge area](photos/norman/peepers_sm.jpg)
Passive-diffusion samples ("peepers") are driven into a wetland to observe the geochemistry of the leachate plume's discharge area |
![USGS scientists analyzing water samples in the field](photos/norman/norman_researchers_sm.jpg)
USGS scientists analyzing water samples in the field |
![Gas samples are collected from an unsaturated zone well to study the natural biodegradation of contaminants](photos/norman/uz_samples_sm.jpg)
Gas samples are collected from an unsaturated zone well to study the natural biodegradation of contaminants |
![A dual-frequency GPS receiver is used to survey passive-diffusion samples ('peepers) in a wetland at the leading edge of the leachate plume](photos/norman/gps_peepers_sm.jpg)
A dual-frequency GPS receiver is used to survey passive-diffusion samples ("peepers") in a wetland at the leading edge of the leachate plume |
![Installation of a well in the unsaturated zone above the leachate plume](photos/norman/uz_well_sm.jpg)
Installation of a well in the unsaturated zone above the leachate plume |
![USGS scientists analyzing samples for a study of the microbial-mediated degradation of landfill leachate](photos/norman/water_samples_sm.jpg)
USGS scientists analyzing samples for a study of the microbial-mediated degradation of landfill leachate |
![USGS scientist collecting water samples from a multilevel monitoring well](photos/norman/water_samples2_sm.jpg)
USGS scientist collecting water samples from a multilevel monitoring well |
![Collecting water samples anaerobically in a glove bag to accurately measure redox-sensitive parameters](photos/norman/collecting_samples_sm.jpg)
Collecting water samples anaerobically in a glove bag to accurately measure redox-sensitive parameters |
![Collecting samples anaerobically in a glove bag as part of a study of the biogeochemistry of the landfill leachate plume](photos/norman/collecting_samples2_sm.jpg)
Collecting samples anaerobically in a glove bag as part of a study of the biogeochemistry of the landfill leachate plume |
![Sampling redox-sensitive water-quality parameters on-site at the Norman Landfill, Norman, Oklahoma](https://webarchive.library.unt.edu/eot2008/20081104234742im_/http://toxics.usgs.gov/photo_gallery/photos/norman/RedoxSampling_s.jpg)
Sampling redox-sensitive water-quality parameters on-site
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![USGS scientists installing a drive point well for contaminant transport studies at the Norman Landfill Research Site, Norman, OK](https://webarchive.library.unt.edu/eot2008/20081104234742im_/http://toxics.usgs.gov/photo_gallery/photos/norman/drivepoint_s.jpg)
USGS scientists installing a drive point well for contaminant transport studies
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