Erosion occurs naturally from weather or runoff but can be intensified by land-clearing practices related to farming, residential or industrial development, road building, or timber cutting. They can damage living things at low concentrations and tend to accumulate in the food chain. Common impervious surfaces include, but are not limited to, rooftops, walkways, patios, driveways, parking lots, storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled, macadam, or other surfaces that similarly impede the natural infiltration of urban runoff. Land-disturbing activities include, but are not limited to, demolition, construction, clearing, grading, filling, and excavation. Sewage disposal system designed to treat wastewater at a particular site.
Organophosphates are short-lived, but some can be toxic when first applied.
The creation or modification of an urban runoff management system in a previously developed area. This may include wet ponds, infiltration systems, wetland plantings, streambank stabilization, and other BMP techniques for improving water quality and creating aquatic habitat. A retrofit can consist of the construction of a new BMP in a developed area, the enhancement of an older urban runoff management structure, or a combination of improvement and new construction. A cloudy condition in water due to suspended silt or organic matter. The land area that drains into a receiving waterbody.