Preservatives recreational water

Water quality is preserved by the U.S. EPA through two mechanisms water quality standards and technology-based effluent limitations. Standards are employed for control of overall water quaUty, while effluent limitations via technological approaches are for certain contaminants from certain sources and function through numerical limitations identified in the NPDES. Standards are promulgated within a context of intended uses (e.g., recreation, water supply) and are numerical or narrative in form. Every state is required by the agency to promulgate water quality standards for all water bodies within its jurisdiction. 

Fish, reptiles, and amphibians are sometimes prepared as whole-body taxidermy mounts, but in collections they are most often preserved in 70% ethanol and water. Dried mounts prepared for display are often painted, since most of the natural pigments change or disappear when the animal dies. Mounted fish, particularly large ones, are often produced as a combination of natural and artificial parts. Large dorsal fins, such as those on sailfish and marlin, are often damaged and are recreated in wax or resin (older mounts) or fiberglass, masonite, or thick cardboard. 

Good communication between the risk assessor and risk manager is important to ensure that ecologically relevant assessment endpoints reflect policy goals and societal values. Societal concerns can range from protection of endangered or commercially or recreationally important species to preservation of ecosystem attributes for functional reasons (e.g., flood water retention by wetlands) or aesthetic reasons (e.g., visibility in the Grand Canyon). 

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