SOIL SURVEY

-64-Table 14 . Brief description of the pedon chosen to characterize the BG4 map unit .HorizonDepth(cm)Ah 0-20 blackACk 20-35very darkgrayish brow nCkl 35-85 light olive brownCk2Cumulic RegosolMoist Colo r85-100+ olive brow nEst . CoarseOrgani cp HFragments Texture Matter(CaCl 2)(%) (%)505045very gravellysil tloamvery gravellysil tloa mgravellysilt loam55 very grayellysil tloam7 .0 267 .3 8 . 77 .3 0 . 57 .3 2 .2The generally steep slopes and the snow avalanching associated with thi smap unit suggest severe to very severe limitations for recreational and engineerin guses .BG5 Map Unit (Orthic and Cumulic Regosols )This map unit is characterized by those soils with little horizon developmentand containing less than 20% coarse fragments which occur on colluvium . Thecolluvium is generally derived from fine textured slates and schists . On steepe rslopes, this map unit may present serious stability problems such as those on th enorth corner of Mount Hurd where there is abundant evidence of ongoing soil cree pas well as mudflow scars . Snow avalanching may be associated with parts of thi smap unit and is designated as BG5 +A where the avalanching occurs on less tha nabout 25% of the map unit and is restricted to well defined chutes, or as BG5Awhere avalanching occurs on more than 25% of this map unit . These soils do notusually have an Ah horizon .