The total land base of the Lillooet TSA is 1 123 827 ha. Areas that administratively do not contribute to the AAC were first removed from this total land base. In the base case, these areas were identified prior to the declaration of the Stein Valley as a Class A Park and represented 110 821 ha (about
10 percent of the TSA) including parks, wilderness areas, ecological reserves, Indian reserves, and federal and private lands. Non-forest and non-productive forest areas totalling 483 854 ha (about 43 percent of the TSA) were then deducted, leaving 529 152 ha (about 47 percent of the TSA) of productive forest land managed by the BC Forest Service (BCFS). However, not all of the productive forest land base contributes to the timber harvesting land base due to a variety of factors discussed below.
The land base contributing to timber harvesting over the long term estimated for the base case is 257 821 ha, which is about 49 percent of the productive forest land of the TSA and 23 percent of the total TSA area. The base case therefore excludes about 51 percent of the productive forest land as follows:
about 22 percent (113 895 ha) accounting for environmentally sensitive areas,
about 18 percent (97 737 ha) accounting for non-merchantable stands, sites with low timber growing potential, deciduous types and non-commercial cover,
about 6 percent (32 083 ha) accounting for inoperable areas, and
about 5 percent (27 615 ha) accounting for roads, trails and landings.
Recent information in the TSA has resulted in some revisions to the timber harvesting land base assumed in the base case. These revisions are first discussed individually below and then within a section on aggregate impact.