A5076267559- Groundwater flow and contamination studies
- Pharmaceutical and Antibiotic Environmental Impacts
- Water Quality and Resources Studies
- Groundwater and Isotope Geochemistry
- Archaeology and Natural History
- Hydrology and Watershed Management Studies
- Toxic Organic Pollutants Impact
- Water Treatment and Disinfection
- Soil and Water Nutrient Dynamics
- Urban Stormwater Management Solutions
- Landfill Environmental Impact Studies
- Plant Water Relations and Carbon Dynamics
- Microbial Community Ecology and Physiology
- Municipal Solid Waste Management
- Per- and polyfluoroalkyl substances research
- Fish Ecology and Management Studies
- Environmental Justice and Health Disparities
- Water resources management and optimization
- Microbial bioremediation and biosurfactants
- Groundwater and Watershed Analysis
- Chromium effects and bioremediation
- Botany, Ecology, and Taxonomy Studies
- Microplastics and Plastic Pollution
- Aquatic and Environmental Studies
- Effects and risks of endocrine disrupting chemicals
United States Geological Survey
2013-2024
Oklahoma-Texas Water Science Center
2023-2024
Texas Water Development Board
2023
Oklahoma Biological Survey
2015-2018
Entertainment Industries Council
2013
Environmental Protection Agency
2005
Increasing global reliance on stormwater control measures to reduce discharge surface water, increase groundwater recharge, and minimize contaminant delivery receiving waterbodies necessitates improved understanding of stormwater–contaminant profiles. A multiagency study organic inorganic chemicals in urban from 50 runoff events at 21 sites across the United States demonstrated that transports substantial mixtures polycyclic aromatic hydrocarbons, bioactive contaminants (pesticides...
To better understand the composition of contaminants emerging concern (CECs) in landfill leachate, fresh leachate from 19 landfills was sampled across United States during 2011.
Widespread disposal of landfill leachate to municipal sewer in the US calls for improved understanding relative organic-chemical contributions WWTP waste stream and associated surface-water discharge receptors environment.
Leachate from municipal landfills can create groundwater contaminant plumes that may last for decades to centuries. The fate of reactive contaminants in leachate-affected aquifers depends on the sustainability biogeochemical processes affecting transport. Temporal variations configuration redox zones downgradient Norman Landfill were studied more than a decade. leachate plume contained elevated concentrations nonvolatile dissolved organic carbon (NVDOC) (up 300 mg/L), methane (16 ammonium...
Final leachates (leachate after storage or treatment processes) from 22 landfills in 12 states were analyzed for 190 pharmaceuticals and other contaminants of emerging concern (CECs), which detected every sample, with the number CECs ranging 1 to 58 (median = 22). In total, 101 different leachate samples, including 43 prescription pharmaceuticals, industrial chemicals, 15 household nonprescription 5 steroid hormones, 4 animal/plant sterols. The most frequently lidocaine (91%, local...
Landfills are the final repository for most of discarded material from human society and its "built environments". Microorganisms subsequently degrade this in landfill, releasing gases (largely CH4 CO2) a complex mixture soluble chemical compounds leachate. Characterization "landfill microbiomes" their comparison across several landfills should allow identification environmental or operational properties that influence composition these microbiomes potentially biodegradation capabilities. To...
Landfills are the final depositories for a wide range of solid waste from both residential and commercial sources, therefore have potential to produce leachate containing many organic compounds found in consumer products such as pharmaceuticals, plasticizers, disinfectants, cleaning agents, fire retardants, flavorings, preservatives, known emerging contaminants (ECs). Landfill was sampled landfill cells three different age ranges two landfills Central Oklahoma. Samples were collected an old...
Global demand for safe and sustainable water supplies necessitates a better understanding of contaminant exposures in potential reuse waters. In this study, we compared load contributions to surface from the discharge three waters (wastewater effluent, urban stormwater, agricultural runoff). Results document substantial varying organic-chemical contribution effluent discharges (e.g., disinfection byproducts [DBP], prescription pharmaceuticals, industrial/household chemicals), stormwater...
The environmental ubiquity of tire and road wear particles (TRWP) underscores the need to understand occurrence, persistence, effects tire-related chemicals in aquatic ecosystems. One such chemical is 6PPD-quinone (6PPD-Q), a transformation product antioxidant 6PPD. In urban stormwater runoff 6PPD-Q can exceed acute toxicity thresholds for several salmonid species being implicated significant coho salmon losses Pacific Northwest. There critical prevalence across watersheds identify habitats...
The functional gene diversity and structure of microbial communities in a shallow landfill leachate-contaminated aquifer were assessed using comprehensive array (GeoChip 3.0). Water samples obtained from eight wells at the same depth immediately below municipal or along predominant downgradient groundwater flowpath. Functional richness closest well considerably lower than those wells. Mantel tests canonical correspondence analysis (CCA) suggested that various geochemical parameters had...
Safe drinking water at the point-of-use (tapwater, TW) is a United States public health priority. Multiple lines of evidence were used to evaluate potential human concerns 482 organics and 19 inorganics in TW from 13 (7 supply, 6 private well self-supply) home 12 (public supply) workplace locations 11 states. Only uranium (61.9 μg L–1, well) exceeded National Primary Drinking Water Regulation maximum contaminant level (MCL: 30 L–1). Lead was detected 23 samples (MCL goal: zero). Seventy-five...
Abstract: Research was conducted to develop a method for obtaining floating pan evaporation rates in small (less than 10,000 m 2 ) wetland, lagoon, or pond. Floating and land data were collected from March 1 August 31, 2005, at natural wetland located the alluvium of Canadian River near Norman, Oklahoma, U.S. Geological Survey Norman Landfill Toxic Substances Hydrology Site. compared with nearby standard Class A on land. significantly less entire period monthly basis. Results indicated that...
Process wastewaters from food, beverage, and feedstock facilities, although regulated, are an under-investigated environmental contaminant source. Food process (FPWWs) 23 facilities in 17 U.S. states were sampled documented for a plethora of chemical microbial contaminants. Of the 576 analyzed organics, 184 (32%) detected at least once, with concentrations as large 143 μg L–1 (6:2 fluorotelomer sulfonic acid), many 47 single FPWW sample. Cumulative per/polyfluoroalkyl substance up to 185...
Episodic stormwater discharges expose aquatic ecosystems to extensive contaminant mixtures. Cumulative acute risks multiple trophic levels are estimated based on mixtures documented in a US reconnaissance.
Precipitation samples for measurement of stable-isotope ratios hydrogen (delta2H) and oxygen (delta18O) were collected at the Norman Landfill Research Site in Norman, Oklahoma, from May 1996 to October 2008. Rainfall amounts also measured site (U.S. Geological Survey gaging station 07229053) during collection period. The delta2H precipitation ranged -121.9 +8.3 per mil, delta18O -16.96 +0.50 mil. volume-weighted average values over 12-year period -31.13 mil -5.57 delta18O. Average...
The environmental ubiquity of tire and road wear particles (TRWP) underscores the need to understand occurrence, persistence, effects tire-related chemicals in aquatic ecosystems. One such chemical is 6PPD-quinone (6PPD-Q), a transformation product antioxidant 6PPD. In urban stormwater runoff 6PPD-Q can exceed acute toxicity thresholds for several salmonid species, being implicated significant coho salmon losses Pacific Northwest. There critical prevalence across watersheds identify habitats...