(1) Following the conclusion of each calendar quarter, the department shall establish the amount of each market index for that quarter for the species of timber listed below. These species are determined to be major species, for which reasonably available and reliable market price information is available. Each index amount shall be established by extracting from the appropriate Western Wood Products Association index the quarterly average prices per thousand board feet. The major species will be indexed to the following indexes:

(a) Douglas fir and larch. For Douglas fir situated west of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "Douglas fir" index of the Coast publication. For Douglas fir and larch situated east of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "dry Douglas fir-larch" index of the Inland publication. Larch situated west of the cascade crest is not a major species and shall not be subject to adjustment of the contract bid price.

(b) Hemlock/true fir. For the hemlocks and true firs situated west of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "hem-fir" index of the Coast publication. For the hemlocks and true firs situated east of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "white fir (hem-fir)" index of the Inland publication.

(c) Ponderosa pine. For ponderosa pine situated east of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "coast-inland north ponderosa pine" index of the Inland publication. Ponderosa pine situated west of the cascade crest is not a major species and is not subject to adjustment of the contract bid price.

(d) White pine. For white pine situated east of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "Idaho white pine" index of the Inland publication. White pine situated west of the cascade crest is not a major species and is not subject to adjustment of the contract bid price.

(e) Engelmann spruce and lodgepole pine. For Englemann spruce and lodgepole pine situated east of the cascade crest, the market index shall be the appropriate quarterly price extracted from the "white woods" index of the Inland publication. Englemann spruce and lodgepole pine situated west of cascade crest are not major species and are not subject to adjustment of the contract bid prices.

(2) Other species not indexed. Species other than those listed above are not major species. There is no readily available and reliable market information for such species and they are not subject to adjustment of the contract bid price.

(3) Cull volume not indexed. Cull logs, including utility logs as defined in the contract, of all species are not major species. There is no readily available and reliable market information for such logs and they are not subject to adjustment of the contract bid price.