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Cateqory <br />and Tvpe <br />of <br />lmpacted <br />Wetland <br />Restoration or <br />Creationl'2 Rehabilitationl'2 Enhancement <br />OnlYt'g <br />Cateoorv <br />IV <br />1 Natural heritaqe sites. alkaliwetlands. and boqs are considered irreplaceable wetlands because <br />they perform special functions that cannot be replaced throuqh compensatory mitiqation. lmpact to <br />such wetlands would therefore result in a net loss of some functions no matter what kind of <br />mitiqation is provided. <br />2 Provides oains in a whole suite of functions both at the site and sub-basin scale. Rehabilitation <br />actions often focus on restorinq environmental processes that have been disturbed or altered bv <br />previous and/or onooino human activitv. <br />3 Actions which provide qains in onlv a few functions. Enhancement action often focuses on <br />structural or superficial improvements to a site and qenerally does not address larqer scale <br />environmental processes. <br />4 Compensatorv mitioation for vernal pool impacts must be seasonallv ponded wetland area(s).7. lncreased Replacement Ratios. The Director mav increase the wetland mitigation ratios <br />stated in Table KCC 174.07.070.6 under the followinq circumstances:a. Uncertaintv exists as to the probable success of the proposed restoration or creation: <br />b. A sionificant period of time will elapse between impact and replication of wetland <br />functions:c. Proposed mitigation will result in a lower cateoory wetland or reduced functions <br />relative to the wetland being impacts: or <br />d. The impact was an unauthorized imoact. <br />8. Alternative Mitiqation Ratios. The Director mav aoprove different mitiqation ratios when the <br />apolicant proposes a combination of wetland creation, restoration. rehabilitation. and/or <br />enhancement. provided that federal and state resource agencies approve the mitigation plan <br />and the plan achieves no net loss of wetland functions and values.9. Mitisation Ratios for Wetland Buffer lmpacts. To mitiqate impacts to functions and values <br />of wetland buffers. a minimum buffer ratio of 1:1 (alteration area:mitiqation area) is required. <br />This ratio assumes that creation/restoration of a wetland buffer with appropriate native <br />vegetation is sufficient to compensate for the wetland buffer functions and values affected bv <br />alteration of an existinq wetland buffer. lf enhancement of an existino wetland buffer is <br />proposed as mitioation. a hiqher mitigation ratio mav be required. For any proposed wetland <br />buffer alterations or development. the applicant must show that the functions and values of <br />the altered wetland buffer will be fullv replaced by the proposed mitioation. The Director mav <br />increase the buffer mitiqation ratios under the followinq circumstances: <br />a. The replacement ratio needed to recover the lost functions and values of buffer area <br />is qreater than 1:1 based upon the existinq tvpe of veqetative cover of either the <br />impact site or the proposed mitiqation site.b. Uncertaintv exists as to the probable success of the proposed restoration or creation:c. A siqnificant period of time will elapse between impact and replication of wetland <br />functions: <br />d The imnacf was an unauthorized imnact <br />10. Mitiqation Plans. Compensatorv wetland mitiqation plan shall be consistent with "Guidance <br />on Wetland Mitiqation in Washinqton State Part 2: Developino Mitioation Plans" (Ecolooy <br />Publication # 06-06-011b). or as revised. Mitiqation plans shall include the oeneral mitioation <br />plan requirements in KCC 174.01.100. as wellas the followinq information:a. Existino and proposed wetland acreage: <br />b. Veoetative and faunal conditions: <br />64