PERMFILE46725

• Permit No: M1981148
• IBM Index Class Name: Permit File
• Doc Date: 8/26/1983
• Doc Name: REGULAR 112 PERMIT APPLICATION
• Media Type: D
• Archive: No

' EXHIBIT J (Cont'd)
The shrub areas are dominated by Rhos trilobata, on the one hand, and
' Cercocarpus montanus, on the other. There is very little overlap between
the individual stands of each species and therefore seem to indicate a response
' to some environmental gradient that expresses very different tolerances in each
species.
Throughout the foothill region Rhus is almost invariably found on lower
' slopes than Cercoca^pvs. It is the same pattern here with Rhos lower on the
slope but adjoining the Cercocarous stands. The cause of this pattern is not
' xe11 understood. It certainly is related to an environmental gradient and not a
chemical antagonism between species. Understory species differ very little and
' therefore, on the whole, they do not represent very distinctive communities
although they look quite different visually.
' Overall cover approaches 100°G. Soils are generally dry, hot, coarse, full
of rocks, an~i quite thin.
' Drainage Courses-
Although most of the land is relatively undissected by drainage courses,
' several small ones and one large one exists. Within these courses is found a
wide variety of vegetation stand types. Some are closely related to surrounding
' areas already described while others are linked, ecologically, to the Bear Creek
stream channel vegetation a couple of miles south of the affected lands. Probably,
the best way to describe the Ea~inage Course vegetation would be to follow a more or
' less typical course to its ultimate development on the site.
The vegetation of the upper parts of the drainage courses are hardly distinguishable
' from the Valley Plain vegetation that merges xith the drainage courses. Generally,
the vegetation is a Stipa-A~ropyron dominated type on moderately heavy to heavy
' soils with or without a gravelly surface.
As the course becomes more definite with eroded soils on the sides, the
grassland becomes broken but remains where the land has any stability. Where less
' stability is found a dense growth of small individuals of Rosa can develop on side
slopes and occassionally on the bottom of the course as xell. Until the course
' becomes quite deep, the vegetation varies between a graspdominated form and
a Rosa-dominated form.
When the course becomes quite deep the vegetation takes on a remarkable
diversity. Bare, eroded slopes become mixed with densely vegetated areas. The
' vegetated areas vary from grass slopes to shrub-covered slopes of Viburnum, Rhus,
Svmnhoriocarpos, and Cercocarous. In the bottoms where moisture is abundant
willows and Cottonxoods are often common and can become quite large.
' Vegetation cover varies from 0% to 100%. Soils are either deep, gravelly and
moist, or are a heavy clay, or a dry, stony sandy loam.
' 44