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Activities of the following types may be authorized with approval of an application for a critical area review 1. The activities in this section are exempt from the development standards in subsequent sections within this chapter; provided, that additional measures to protect life and property or to protect environmental quality may be required.

A. Addition to or reconstruction of an existing legally established structure or building within a critical area and/or buffer constructed on or before January 1, 2005, provided the following criteria are met:

1. The seasonal limitations on land clearing, grading, filling, and foundation work described in MICC 19.07.160(F)(2) shall apply.

2. Additions shall be allowed if all of the following criteria are met:

a. The structure is enlarged not more than a cumulative total of 200 square feet larger than its footprint as of January 1, 2005;

b. If the existing, legally established structure is located over or within a wetland or watercourse, no further expansion within the wetland or watercourse is allowed;

c. If the existing legally established structure is located within a wetland or watercourse buffer, the addition may be no closer to the wetland or watercourse than a distance equal to 75 percent of the applicable standard buffer and must also be no closer to the watercourse or wetland than the existing structure;

d. A critical area study approved by the city demonstrates that impacts have been avoided or minimized and mitigated consistent with MICC 19.07.100, Mitigation sequencing;

e. If the modification or addition is proposed within a geologically hazardous area or associated buffer, a qualified professional provides a statement of risk consistent with MICC 19.07.160(B)(3).

3. Reconstruction of legally established nonconforming structures shall meet the standards in MICC 19.01.050. The code official may require a critical area study and mitigation plan addressing temporary impacts to critical areas and buffers.

4. Demolition. Removal of structures in watercourse and wetland buffers and geologically hazardous areas, provided:

a. Site disturbance is limited to the existing access and building footprint;

b. There is no site disturbance within or to wetlands or watercourses;

c. All soils are stabilized and the area is revegetated with appropriate native vegetation; and

d. Necessary building permits are obtained.

B. Restoration and enhancement activities involving site disturbance over 1,000 square feet, provided the following criteria are met:

1. Erosion control measures are implemented when soils have been disturbed;

2. Groundcover voids that result from the removal of noxious weeds shall be revegetated with regional native plants;

3. Removal of noxious weeds and other restoration work shall be undertaken with hand labor, including handheld mechanical tools, unless the King County Noxious Weed Control Board best management practice specifically prescribes the use of riding mower, light mechanical cultivating equipment, or herbicide or biological control methods; and

4. Herbicide use is in accordance with federal and state law.

C. Storm water retrofit facilities installed pursuant to the city’s NPDES Phase II permit.

D. Any pruning shall not be detrimental to tree health and shall be consistent with International Society of Arboriculture standards and completed under the supervision of a qualified arborist. (Ord. 19C-05 § 1 (Exh. A)).