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In addition to the substantive requirements of SMC 14.255.120, the following requirements shall apply to habitat conservation areas:

A. No plant, wildlife, or fish species not indigenous to the region shall be introduced into a habitat conservation area, except with approval of a state or federal agency with expertise.

B. Preference in mitigation shall be given to contiguous wildlife habitat corridors.

C. In reviewing development proposals, the City shall seek opportunities to restore degraded riparian fish and wildlife functions such as breeding, rearing, migration, and feeding.

D. The City shall require buffers of undisturbed native vegetation adjacent to habitat conservation areas in accordance with SMC 14.280.060. Buffer widths shall reflect the sensitivity of the habitat and may reflect the intensity of nearby human activity.

E. When a species is more sensitive to human activity during a specific season of the year, the City may establish an extra outer buffer from which human activity is excluded during said season.

F. No development shall be allowed within a habitat conservation area or buffer with which state or federal endangered, threatened, or sensitive species have a primary association, except in exchange for restoration as approved by the City Planner or as provided in a management plan approved by a state or federal agency with appropriate expertise.

G. When a development permit is applied for on land containing or adjacent to a bald eagle nest or communal roost, the City shall notify the Washington Department of Fish and Wildlife and otherwise comply with WAC 232-12-292.

H. No development shall be permitted which degrades the functions or values of anadromous fish habitat, including structures or fills which impact migration or spawning, except in exchange for restoration.

I. Construction and other activities within streams shall be seasonally restricted as necessary to protect the resource. Activities shall be timed to occur during work windows designated by the Washington Department of Fish and Wildlife for applicable fish species.

J. Shoreline erosion control shall use bioengineering methods or soft armoring in accordance with an approved critical area report.

K. Relocation of streams is not permitted unless it is part of a stream restoration project and it will result in equal or better habitat and water quality, and will not diminish the flow capacity of the stream.

L. The following requirements shall apply to culverts:

1. Culverts may be allowed in streams only if they are necessary for the development to occur, if they are designed according to the Washington Department of Fish and Wildlife criteria for fish passage and if a state hydraulic project approval has been issued.

2. The applicant or property owner shall keep every culvert free of debris and sediment at all times to allow free passage of water and, if applicable, fish.

3. The City may require that a stream be removed from an existing culvert as a condition of approval, unless the culvert is not detrimental to fish habitat or water quality, or removal and/or replacement would be detrimental to fish or wildlife habitat or water quality on a long-term basis.

M. Clearing and grading, when permitted as part of an authorized development activity or as otherwise allowed in these standards, shall comply with the following:

1. Grading shall be allowed only during the designated dry season, which is typically regarded as beginning April 1st and ending October 31st of each year; provided that the City may extend or shorten the designated dry season on a case-by-case basis to reflect actual weather conditions and the incorporation of best management practices to control stormwater.

2. The soil duff layer shall remain undisturbed to the maximum extent possible. Where feasible, any soil disturbed shall be redistributed to other areas of the site, provided that such redistribution shall not constitute authorized fill.

3. The moisture-holding capacity of the topsoil layer shall be maintained by minimizing soil compaction or reestablishing natural soil structure and infiltrative capacity on all areas of the project area not covered by impervious surfaces.

N. To the extent facilities are allowed in habitat conservation areas, the following regulations shall apply.

1. Trails shall be on the outer edge of the stream buffer except for limited viewing platforms and crossings. Trails and platforms shall be of pervious materials as far as possible.

2. Road bridges and culverts shall be designed according to the Washington Department of Fish and Wildlife Fish Passage Design at Road Culverts, 1999, and the National Marine Fisheries Service Guidelines for Salmonid Passage at Stream Crossings, 2000.

3. Utility lines shall be accomplished by boring beneath the scour depth and hyporheic zone (the saturated zone beneath and adjacent to streams that filters nutrients and maintains water quality). Utilities shall avoid paralleling streams or changing the natural rate of shore or channel migration.

4. New and expanded public flood protection measures shall require a biological assessment approved by the agency responsible for protecting federally listed species.

5. In-stream structures such as high-flow bypasses, sediment ponds, instream ponds, retention and detention facilities, tide gates, dams, and weirs shall be allowed only as part of an approved restoration project.

6. Stormwater conveyance structures shall incorporate fish habitat features and the sides of open channels and ponds shall be vegetated to retard erosion, filter sediments, and shade the water.

7. Watercourse alterations shall be in accordance with SMC 14.270.030.H.