Site Preparation Activities


Effects of site preparation activities may involve use of heavy equipment for transport and application of chemicals. New impervious surfaces allow for faster and more delivery of soil and contaminants in stormwater runoff, causing impaired water quality. In-water work may be required to complete some activities, resulting in injury or death of fish due to handling. Site preparation may involve cordoning off a portion of the water body in preparation for biocide or chemical application. Siltation, sedimentation, and other deleterious physical effects to the environment may occur on a short-term basis.


Heavy equipment. Use of heavy equipment compacts soil, thus reducing soil permeability and infiltration of stormwater. Use of heavy equipment also creates a risk that accidental spills of fuel, lubricants, hydraulic fluid, control chemicals and other similar contaminants may occur. Discharge of water used during the control action may carry sediments and a variety of contaminants to the riparian area and stream.


In-water work. Although the most lethal biological effects of the proposed actions on individual listed species will likely be caused by the isolation of in-water areas, lethal and sublethal effects would be greater than without isolation. In-water work area isolation is a conservation measure intended to reduce the adverse effects of erosion and runoff on the population.