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174.02.760 Structure. "Structure" means a permanent or temporarv edifice or building, or anv piece of work artificiallv built or composed of parts joined together in some definite manner. whether installed on. above. or below the surface of the qround or water. exceot for vessels. 174.02.770 Unavoidable. "Unavoidable" means adverse impacts that remain after all appropriate and practicable avoidance and minimization have been achieved. 174.02.780 Volcanic Hazard Areas. Volcanic hazard areas are subject to pyroclastic flows. lava flows. debris avalanche. inundation by debris flows. mudflows. or related floodino resultinq from volcanic activity. There are no active or dormant volcanoes located within Kittitas Countv: however. Mount Rainer and Mount St. Helens are relatively near. Hazards to Kittitas County residents from these volcanoes are limited to ash deposition. 17A.02.790 Watercourse. "Watercourse." "river" or "stream" means anv rtion of a stream or river channel. bed. bank. or bottom waterward of the ordinary hiqh water line of waters of the state. Watercourse also means areas in which fish mav spawn. reside. or pass. and tributarv waters with defined bed or banks that influence the qualitv of habitat downstream. Watercourse also means waters that flow intermittentlv or that fluctuate in level durinq the year. and the term apolies to the entire bed of such waters whether or not the water is at oeak level. A watercourse includes all surface-water-connected wetlands that provide or maintain habitat that suooorts fish life. This definition does not include irrigation ditches, canals. stormwater treatment and conveyance svstems. or other entirelv artificial watercourses. except where thev exist in a natural watercourse that has been altered by humans.. 17A.02.800 WaterQualitv. "Water qualitv" means the phvsical characteristics of water, includinq water quantitv, hvdroloqical. phvsical. chemical. aesthetic. recreation-related. and bioloqicalcharacteristics. 174.02.810 WaterSystem. "Water system" means anv system providinq water intended for, or used for. human consumption. domestic uses. or commercial businesses. lt includes. but is not limited to. the source, ourification. storaqe, transmission. pumping. irriqation. and distribution facilities. 17A.02.820 Waters of the State. "Waters of the state" means lakes. rivers. ponds. streams. inland waters. underground waters. and all other surface watercourses within the jurisdiction of the state of Washinqton. as classified in WAC 222-16-030. 17A.02.830 WellheadProtectionArea. "Wellhead protection area" means the portion of a well's. wellfield's. or sprinq's zone of contribution within the ten-year time of travel boundary. or boundaries established usinq alternate criteria approved by the state Department of Health in those settings where oroundwater time of travel is not a reasonable delineation criteria. 32