A committee may determine potential site productivity:
Directly, by tree growth and stocking measurements made in a locale; or
Indirectly, by using applicable USDA Natural Resources Conservation Service soil survey information, USDA Forest Service plant association guides, Oregon Department of Revenue site class maps, or other information determined by the State Forester to be of comparable quality.
If western juniper is present in a locale, a committee may consider western juniper to be a tree species which is native to the locale.
A committee may not consider the existence of structures, improvements, or clearings, when making classification decisions.
A committee may not consider the existence of city limits, urban growth boundaries, zoning, or the absence or presence of an organized structural fire protection provider, when making classification decisions.