HRS Hazard Ranking System Score. A mathematical score given to each Superfund site, used to set priorities for cleanup of sites. Also called an HRS score.
Hypolimnion The bottom layer of lake water during the summer months. The water in the hypolimnion is denser and much colder than the water in the upper two layers.
Interim Remedial Measure Action taken to protect public health or remove or continue an obvious source of contamination before a remedial investigation is complete.
Junkyard A lot or property where worn-out or discarded items, metal or other scrap material is stored for possible resale.
Karst Topography characterized by depressions without external drainage, such as sinkholes, underground caverns and solution channels.
Lake Management A process that involves study, assessment of problems, and decisions on how to maintain a lake as a thriving ecosystem.