a. Areas delineated by the U.S. Department of Agriculture’s Natural Resources Conservation Service as having a severe limitation for building site development;

b. Areas mapped by the Washington Department of Ecology (Coastal Zone Atlas) or the Washington State Department of Natural Resources (slope stability mapping) as unstable (U or class 3), unstable old slides (UOS or class 4), or unstable recent slides (URS or class 5);

c. Areas designated as quaternary slumps, earthflows, mudflows, lahars, or landslides on maps published by the U.S. Geological Survey or Washington State Department of Natural Resources;

d. Areas where the following coincide: slopes steeper than fifteen percent, relatively permeable sediment overlying a relatively impermeable sediment or bedrock, and ground water seepage;

e. Areas that have shown movement in the past ten thousand years or that are underlain or covered by mass wastage debris of that time frame;

f. Slopes that are parallel or sub-parallel to planes of weakness (such as bedding planes, joint systems, and fault planes) in subsurface materials;

g. Slopes steeper than eighty percent subject to rock fall during seismic shaking;

h. Areas potentially unstable because of rapid stream incision, stream bank erosion, and undercutting by wave action;

i. Areas at risk from snow avalanches;

j. Canyons or active alluvial fans subject to debris flows or catastrophic flooding; and

k. Slopes of forty percent or steeper with a vertical relief of ten or more feet except areas composed of consolidated rock.