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regulations or permit requirements. Any incidental damage to, or alteration of a critical <br />area that is not a necessary outcome of the exempted activity shall be restored, <br />rehabilitated, or replaced at the expense of the property owner. <br />1. Emergencies that threaten the public health, safety and welfare, as verified by the city. <br />Emergency actions that create an impact to a critical area or its buffer shall use <br />reasonable methods to address the emergency; in addition, they must have the least <br />possible impact to the critical area and/or its buffer; <br />2. Legally constructed structures and improvements in existence on the date the ordinance <br />codified in this chapter becomes effective that do not meet the buffer requirements of <br />this chapter may be remodeled, reconstructed, expanded or replaced provided that the <br />new construction or related activity does not further encroach into a critical area or the <br />portion of the required buffer between the critical area and existing improvements. <br />Expansions shall be limited to a maximum of 1,000 sf of impervious surface. To the <br />extent feasible based on site-specific conditions, expansions shall result in no additional <br />hydrologic impacts from stormwater runoff by using techniques such as low impact <br />development. Remodeling, reconstruction, and expansions shall be subject to all other <br />requirements of the zoning code; <br />3. Existing and ongoing agriculture in agricultural zones in existence as of the date this <br />chapter becomes effective; provided, however, at such time as the property ceases to be <br />used for agricultural activities and a development activity is proposed, the property shall <br />be brought into compliance with the provisions of this chapter, and further provided that <br />existing ditches and drain tiles are not expanded in a manner that will drain wetlands in <br />existence as of the date this chapter becomes effective. This exemption does not apply <br />to filling or alteration of wetlands not in agricultural use as of the date this chapter <br />becomes effective. The City encourages the use of best management practices or farm <br />conservation plans to reduce impacts of agricultural practices on critical areas; <br />4. Normal and routine maintenance of legally constructed irrigation and drainage ditches, <br />provided that this exemption shall not apply to any ditches used by salmonids; <br />5. Normal and routine maintenance of agricultural ponds, livestock watering ponds and <br />fish ponds, provided that such activities shall not involve the conversion of any wetland <br />or stream not used for such purposes on the date this chapter becomes effective; <br />6. Entirely artificial structures or wetlands intentionally constructed by humans from <br />upland areas for purposes of storm water drainage or water quality control, or <br />ornamental landscape ponds, which are not part of a mitigation plan required by this <br />chapter; <br />7. Wetland size exemptions: The following wetlands are exempt from compliance with <br />the mitigation sequencing provisions in Section 12(A) [37.120(A)] of this chapter: <br />a. Category I, II, I11, and IV wetlands less than 1,000 square feet in area that meet all of <br />the following criteria: <br />Co <br />