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The purpose of the workshop is to introduce participants to the concept of integrated water resource management (IWRM) and to train federal, state, tribal, municipal/utility, NGO, and consultants in the use and applications of EPA&rsquo;s Watershed Management Optimization Support...

This presentation discusses &quot;accountability&quot;; e.g., do emission-control regulations really reduce exposure to pollutants and improve human health? In this presentation, we provide examples of how to examine this and related questions.

The National Land Cover Database (NLCD) contains three eras (2001, 2006, 2011) of percentage urban impervious cover (%IC) at the native pixel size (30&#8239;m-&times;-30&#8239;m) of the Landsat Thematic Mapper satellite. These data are potentially valuable to environmental manage...

The conventional wisdom of lead solubility has been built over the years by geochemical solubility models, experimental studies, and actual field sampling of drinking water lead levels by differing protocols. These models predict that lead solubility and release would be controll...

Freshwater mussels (order Unionoida) are one of the most imperiled groups of animals in the world. However, freshwater mussels are generally under-represented in toxicity databases used to derive the US Environmental Protection Agency ambient water quality criteria (WQC) and othe...

This fact sheet provides information about EPA's Ada, OK facility, Robert S. Kerr Environmental Research Center, and will be available to the public.

The multivariate AMBI (M-AMBI) is an extension of the AZTI Marine Biotic Index (AMBI) that has been used extensively in Europe, but not in the United States. In a previous study, we adapted AMBI for use in US coastal waters (US AMBI), but saw biases in salinity and score distribu...

The Model for Prediction Across Scales &ndash; Atmosphere (MPAS-A) has been modified to allow four-dimensional data assimilation (FDDA) by the nudging of temperature, humidity, and wind toward target values predefined on the MPAS-A computational mesh. The addition of nudging allo...

In estuaries, land-surface and tidal elevation conspire to influence the amount of salt-water inundation in a specific location, ultimately affecting the distribution of estuary vegetation. Plants vary in their tolerances to salinity and inundation. Understanding even small chang...

Atmospheric models that accurately describe the fate and transport of trace species for the right reasons aid in the development of effective air-quality management strategies that safeguard human health. Controllable emissions facilitate the formation of biogenic secondary organ...

This work presents the results of an international interlaboratory comparison on ex situ passive sampling in sediments. The main objectives were to map the state of the science in passively sampling sediments, identify sources of variability, provide recommendations and practica...

The Adverse Outcome Pathway (AOP) framework has emerged to capitalise on the vast quantity of mechanistic data generated by alternative techniques (such as in vitro and in chemico), as well as advances in systems biology, cheminformatics, and bioinformatics. AOPs provide a scaffo...

Due to the ever-increasing number of chemicals coming to market, and the cost of performing traditional in vivo studies, there has been a shift towards the use of less costly alternative techniques. The adverse outcome pathway (AOP) concept has emerged as a scaffold for organisin...

Hexafluoropropylene oxide dimer acid (HFPO-DA, aka GenX) is a member of the per- and polyfluoroalkyl substances (PFAS) chemical class and a high-profile contaminant of emerging concern. Elevated levels of HFPO-DA have been detected in multiple environmental matrices and treated ...

This presentation is part of a ORD webinar on using total aerobic spores as a supplement to GWUDI determination tool. This presentation goes into great detail the method of how to analyze a water sample for aerobic endospores.

The aggregation and long-term (25 d) sedimentation behaviors of reduced graphene oxide (RGO) and its three successively self-assembled nanohybrids with magnetite (Fe3O4) and zerovalent silver (Ag0) nanoparticles were investigated. The aggregation behaviors of the nanomaterials in...

Epoxy-based materials are widely used for coatings, electronics insulations, and waterproofing applications due to their excellent properties such as excellent adhesion, electrical insulation, and heat resistance along with the strong mechanical property. The making of composites...

Many cities are experiencing long-term declines in population and economic activity. As a result, frameworks for urban sustainability need to address the unique challenges and opportunities of such shrinking cities. Shrinking, particularly in the U.S., has led to extensive vacant...

We present airborne observations of gaseous reactive halogen species (HCl, Cl2, ClNO2, Br2, BrNO2, and BrCl), sulfur dioxide (SO2), and nonrefractory fine particulate chloride (pCl) and sulfate (pSO4) in power plant exhaust. Measurements were conducted during the Wintertime INves...

A morphological defect, a cortical heterotopia, has been observed in the brains of rat pups exposed in utero to moderate doses of the thyroid hormone (TH) synthesis inhibitor propylthioruracil (PTU). TH insufficiency during late gestation/early postnatal period is required to ind...

We have estimated the Ecological Footprint (EF) of the Chicago Metropolitan Area (CMA) between 1990 and 2013. EF is a metric that accounts for a region&rsquo;s ecological balance by comparing the regional supply of natural resources to the corresponding demand on those resources....

This webinar, titled &ldquo;EPA&rsquo;s Storm Water Management Model (SWMM)&rdquo;, is scheduled for Tuesday February 20th at 12pm Eastern. This webinar will introduce the Storm Water Management Model (SWMM). SWMM is used throughout the world for planning, analysis, and design ...

Groundwater nitrate contamination affects thousands of households in Oregon&rsquo;s southern Willamette Valley and many more across the USA. The southern Willamette Valley Groundwater Management Area (GWMA) was established in 2004 due to nitrate levels in the groundwater exceedi...

Presentation on lead at the 15th Annual EPA Drinking Water Workshop: Small Systems Challenges and Solutions. To facilitate the development of an area-wide optimization program within the participating states and EPA. EPA procedure requires no intentional flushing before 6 hour s...

This report explores rainfall-runoff models, their generation methods, and the categories under which they fall. Runoff plays an important role in the hydrological cycle by returning excess precipitation to the oceans and controlling how much water flows into stream systems. Mode...