The Experts below are selected from a list of 132270 Experts worldwide ranked by ideXlab platform

Sven Ove Hansson - One of the best experts on this subject based on the ideXlab platform.

Maggie Breville - One of the best experts on this subject based on the ideXlab platform.

David F Layton - One of the best experts on this subject based on the ideXlab platform.

  • policy implementation and the Environmental Protection Agency what factors influence remediation at superfund sites
    Policy Studies Journal, 2004
    Co-Authors: Dorothy M Daley, David F Layton
    Abstract:

    Since the early 1990s, the Environmental Protection Agency (EPA) has struggled to make Superfund, the program that addresses the nation's worst hazardous waste sites, “faster, fairer, and more efficient.” Indeed, Agency figures reflect substantial changes in recent years. Since 1993, over 500 Superfund sites have reached the “construction completion” stage in remediation. Comparatively, in the program's first 13 years, only 156 sites reached construction completion. This article explores why some Superfund sites are more likely to be remediated than others. We use survival analysis to empirically test three theoretical models of Superfund remedial progress: (1) Administrative Convenience/Transaction Costs; (2) Problem Severity; and (3) Political Pressure models. The results indicate that the EPA is more likely to tackle “easier” or low-risk sites within the program, community involvement in Superfund is associated with decreased remedial progress, and remedial action is more likely to occur when political oversight is present.

Welford C. Roberts - One of the best experts on this subject based on the ideXlab platform.

  • Risk assessment in the Environmental Protection Agency
    Journal of Hazardous Materials, 1994
    Co-Authors: Charles O. Abernathy, Welford C. Roberts
    Abstract:

    Risk assessment is the general process used to determine the potential risk of an adverse health effect occurring from exposure to an agent. It consists of a hazard identification, a dose-response evaluation, an exposure assessment and a risk characterization. At the U.S. Environmental Protection Agency, risk assessments are used to estimate risks from Environmental contaminants. Risk management uses the risk characterization along with such variables as economic, social, legal, technical, analytical and political factors to arrive at a regulatory level. The public is informed of regulatory actions prior to and after promulgation of the final rule through the process of risk communication.

Roberta Parry - One of the best experts on this subject based on the ideXlab platform.

  • agricultural phosphorus and water quality a u s Environmental Protection Agency perspective
    Journal of Environmental Quality, 1998
    Co-Authors: Roberta Parry
    Abstract:

    Pollution of lakes, rivers, and estuaries from agricultural sources of P is a major water quality problem in the USA. This paper explains the regulatory and nonregulatory programs developed by the U.S. Environmental Protection Agency (USEPA) to implement its legal mandate to control water pollution from these sources. The Clean Water Act defines concentrated animal feeding operations as point sources of pollution that are required to obtain permits to discharge into waters of the USA. All other agricultural sources are considered nonpoint and are not regulated under federal law. The USEPA provides grant money to the states to develop and implement nonpoint source programs. The Coastal Zone Act Reauthorization Amendments of 1990 requires coastal states to adopt nonpoint management measures that are backed by enforceable policies and mechanisms. For water bodies that continue to be impaired despite the basic implementation of these laws and other programs, states are required to develop a total maximum daily load (TMDL). The TMDL process is the quantitative basis for reaching water quality standards. The USEPA is putting a new emphasis on controlling nutrient pollution sources to meet the goal of the Clean Water Act.