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Kittitas County Shoreline Master Program Chapter 5 71 March 7, 2016 a. Uncertainty exists as to the probable success of the proposed restoration or creation; b. A significant period of time will elapse between impact and replication of wetland functions; or c. Proposed mitigation will result in a lower category wetland or reduced functions relative to the wetland being impacted. 9. Alternative mitigation ratios: The Administrator may approve different mitigation ratios when the applicant proposes a combination of wetland creation, restoration, rehabilitation, and/or enhancement, provided that federal and state resource agencies approve the mitigation plan and the plan achieves no net loss of wetland functions and values. 10. Mitigation ratios for wetland buffer impacts: a. To mitigate impacts to functions and values of buffers, a minimum buffer ratio of 1:1 (alteration area:mitigation area) is required. This ratio assumes that creation/restoration of a wetland buffer with appropriate native vegetation is sufficient to compensate for the wetland buffer functions and values affected by alteration of an existing wetland buffer. If enhancement of an existing wetland buffer is proposed as mitigation, a higher mitigation ratio may be required. For any proposed wetland buffer activities, the applicant must show that the functions and values of the altered wetland buffer will be fully replaced by the proposed mitigation. The Administrator may increase the buffer mitigation ratios under the following circumstances: i. The replacement ratio needed to recover the lost functions and values of buffer area is greater than 1:1 based upon the existing type of vegetative cover of either the impact site or the proposed mitigation site. ii. Uncertainty exists as to the probable success of the proposed restoration or creation; iii. A significant period of time will elapse between impact and replication of wetland functions. 11. Compensatory wetland mitigation plans shall be consistent with “Wetland Mitigation in Washington State, part 1 Agency Policies and Guidance (Ecology Publication # 06-06-011a) and Wetland Mitigation in Washington State Part 2: Guidelines for Developing Freshwater Mitigation Plans and Proposals” (Ecology Publication # 06- 06-011b), or as revised. J. Regulations—aquatic habitat conservation area designation and mapping 1. Designation and classification: Aquatic habitat conservation areas include: a. Those streams and lakes which meet the criteria for Type S, F, Np, and Ns waters, as defined in the water type classifications in the forest practices rules in WAC 222-16-030. Type S waters are synonymous with shorelines of the state.