Science Inventory

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The National Tunnel is a part of the Central City/Idaho Springs Superfund site. Because passive treatment is an important possibility for removal of contaminants from the water, the USEPA and the Colorado Division of Public Health and Environment (CDPHE) have been sponsoring a ...

The USEPA's Draft Framework for Developing Suspended and Bedded Sediments Water Quality Criteria is based on an ecoepidemiological approach that is potentially applicable to any chemical or non-chemical agent. An ecoepidemiological approach infers associations from the co-occurre...

This project will produce a GIS database and habitat maps of benthic substrates and biological assemblages within the Estero Bay Aquatic Preserve. A biological approach for identifying ambient water quality conditions will be developed. This will increase awareness among resource...

The Keith Lake / Salt Bayou system of wetlands is an important site for over-wintering waterfowl and for the protection of other fauna and flora once abundant in the region. This project will help water resource managers find cost-effective strategies to address wetland problems...

Currently, Ambient Water Quality Criteria (AWQC) for aquatic life protection are derived according to the Guidelines for Derivation of Ambient Water Quality Criteria for the Protection of Aquatic Life and Their Uses, published in 1985. To ensure that AWQC are derived from the be...

MTBE is an organic chemical used as a gasoline oxygenate throughout the U.S. to improve air quality. Because of its chemical properties and widespread use , concerns have been raised over the potential risks posed by exposure of aquatic organisms to MTBE. ENSR developed a draft...

The United States Environmental Protection Agency is revising its methodology for deriving national ambient water quality criteria (AWQC) to protect human health. A component of this guidance involves assessing the potential for chemical bioaccumulation in commonly consumed fish ...

EPA's methodology uses trophic level-specific bioaccumulation factors (BAFs) and fish ingestion rates to account for exposure to chemicals from the consumption of freshwater and estuarine fish and shellfish.

To achieve the nation's water quality goals of "fishable and swimmable" waters, the Agency is tasked with implementation of the Total Maximum Daily Load (TMDL) program. The objective of the TMDL program is attainment of ambient water quality standards through the control of both...

Nonylphenol is a toxic breakdown product of nonylphenol ethoxylate (NPE) surfactants. NPE surfactants are used in industrial cleaning applications and pesticide formulations. EPA published a draft ambient water quality criteria document for nonylphenol in January 2004.

The purpose of the bioaccumulation chapter is to present EPA's recommended methodology for deriving bioaccumulation factors for setting national 304(a) water quality criteria to protect human health.

The behavioral responses of fishes, specifically preference and avoidance reactions, to temperature are described using a general graphical model based on a broad overview of the literature. A quantitative measure of eurythermality, based on the area of the thermal preference zon...

Thirteen epidemiologic studies of ingested asbestos conducted in five areas of the U.S. and Canada were reviewed and evaluated for the definitiveness and applicability regarding the development of ambient water quality standards. One or more studies found male or female associati...

The Clean Water Act of 1971 directed the Environmental Protection Agency to establish ambient water quality criteria for several classes of elements and compounds, including phthalate esters. Multispecies acute toxicity data are required to develop these criteria. Static bioassay...

See the published paper for the abstract.

The 2000 Human Health Methodology incorporates a number of specific advancements made over the past two decades, one of which is in the assessment of chemical exposure to humans through the food chain pathway. For certain chemicals, the food chain exposure pathway is more importa...

Nutrient overenrichment from agricultural and urban point and nonpoint sources, including urban stormwter, is a leading cause of impairment to our nation's rivers, lakes, and coastal waters. For waters that do not currently meet existing water quality standards, The USEPA's TMDL ...

In 1998, EPA published its draft revision to the methodology for deriving ambient water quality criteria to protect human health. Four methods were proposed to determine lipid-normalized bioaccumulation factors based on freely-dissolved water concentrations (BAFs) for nonpolar or...

Context <br>EPA Region 10, which comprises Alaska, Washington, Idaho, and Oregon, has 269 federally recognized Native American Tribes. It is has been documented that Tribal members consume much larger quantities of fish than the general population. ORD's Human Studies Division...

The Ambient Water Quality Criteria that were promulgated by the U.S. Environmental Protection Agency in 1980 included water concentration levels which, for many pollutants, were so low as to be unmeasurable by standard analytical methods. Criteria for controlling toxics in munici...

Epidemiologic data can be used in risk assessment in various ways: to calculate the dose-response relationship between exposure levels and adverse effects; to establish ranges of exposure known to be safe or unsafe; to verify an endpoint in humans derived from a route or species ...

The report is designed as a manual to evaluate the efficiency of surface-water quality monitoring networks whose primary objective is to document compliance with or progress toward attaining ambient water quality standards. The manual provides methods to evaluate the efficiency o...

This report was prepared in support of the Ohio River Basin Energy Study (ORBES), a multidisciplinary policy research program supported by the Environmental Protection Agency. Water consumption levels associated with power plant cooling were estimated for different energy develop...

This study was one of five intensive watershed studies designed by the Chesapeake Bay Program's Eutrophication Work Group to provide detailed nonpoint source loading rates and ambient water quality data within the Chesapeake Bay drainage area. The study was conducted within the P...

A major goal of the numeric nutrient criteria program is to develop waterbody-type technical guidance manuals for assessing trophic state. EPA has published guidance for lakes and for rivers. EPA Region 1 is publishing New England-specific guidance in 2001 for lakes, ponds and ...