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<br /> <br />30 <br /> <br /> <br />17A.02.650 Restore or Restoration. <br />"Restore," "restoration" or "ecological restoration" means repairing environmental damage to a <br />condition equivalent to the pre-impact condition, or upgrading of impaired critical area processes or <br />functions. This may be accomplished through measures including, but not limited to, re-vegetation, <br />removal of intrusive stream bank structures, or removal or treatment of toxic materials. Restoration <br />does not imply a requirement for returning the critical area to aboriginal or pre-European settlement <br />conditions. <br /> <br />17A.02.660 Riparian. <br />“Riparian” areas are transitional between terrestrial and aquatic ecosystems and are distinguished <br />by gradients in biophysical conditions, ecological processes, and biota. They are areas through <br />which surface and subsurface hydrology connect waterbodies with their adjacent uplands. They <br />include those portions of terrestrial ecosystems that significantly influence exchanges of energy and <br />matter with aquatic ecosystems (i.e., a zone of influence). <br /> <br />17A.02.665 Riparian Management Zone(s) <br />“Riparian management zone(s)” or “RMZ(s)” is a scientifically based description of the area adjacent <br />to rivers and streams (see “riparian”) based on the site potential tree height conceptual framework. It <br />is the area that has the potential to provide full ecological function for bank stability, shade, pollution <br />removal, contributions of detrital nutrients, and recruitment of large woody debris. <br />17A.02.670 Seismic Hazard Areas. <br />“Seismic hazard areas” are areas subject to severe risk of damage as a result of earthquake induced <br />ground shaking, slope failure, settlement, soil liquefaction, lateral spreading, or surface faulting. <br />17A.02.680 Setback. <br />"Setback" means the distance a building or structure is placed from a specified limit such as a lot line <br />or a critical area buffer. <br />17A.02.690 Shorelines of the State. <br />"Shorelines" means all of the water areas of the state, including reservoirs, and their associated <br />shorelands, together with the lands underlying them; except (i) shorelines of statewide significance; <br />(ii) shorelines on segments of streams upstream of a point where the mean annual flow is twenty <br />cubic feet per second (20 cfs) or less and the wetlands associated with such upstream segments; <br />and (iii) shorelines on lakes less than twenty (20) acres in size and wetlands associated with such <br />small lakes. <br />17A.02.700 Shorelines of Statewide Significance. <br />"Shorelines of statewide significance" means the shorelines identified in RCW 90.58.030 which <br />because of their elevated status require the optimum implementation of the Shoreline Management <br />Act’s policies. This includes all rivers with a mean annual flow of greater than two hundred cubic feet <br />per second (200 cfs) and lakes with surface areas of one thousand (1,000) acres or more. <br /> <br />17A.02.710 Shrub-Steppe. “Shrub-Steppe” is a nonforested vegetation type consisting of <br />one or more layers of perennial bunchgrasses and a conspicuous but discontinuous layer of shrubs <br />(see Eastside Steppe for sites with little or no shrub cover). Although Big Sagebrush (Artemisia <br />tridentata) is the most widespread shrub-steppe shrub, other dominant (or co-dominant) shrubs <br />include Antelope Bitterbrush (Purshia tridentata), Threetip Sagebrush (A. tripartita), Scabland <br />Sagebrush (A. rigida), and Dwarf Sagebrush (A. arbuscula). Dominant bunchgrasses include (but