Cal. RTC § 401.8

(a) Notwithstanding any other provision of law, commencing with the 1995–96 fiscal year, the county assessor shall determine the property tax assessed value in the county attributable to assessable intercounty pipeline rights-of-way on the basis of a single, countywide parcel per taxpayer by combining the assessed values of each separate right-of-way interest, or segment thereof, of the taxpayer in the county. However, the assessor shall maintain a separate base year value as determined pursuant to Section 110.1 for each separate right-of-way interest, or segment thereof.

(b) Any assessment appeal that is authorized to be filed in Sections 401.10 to 401.12, inclusive, with respect to an intercounty pipeline right-of-way interest, or segment thereof, for which the assessor did not assign a value in the manner specified in subdivision (a) of Section 401.10, shall be filed by the taxpayer upon one or more specified intercounty pipeline right-of-way interests, or segments thereof, as described in subdivision (a), and in no event shall be filed with respect to a taxpayer’s entire, undivided intercounty pipeline right-of-way. The assessor shall maintain for five calendar years those records for each assessment year that identify each intercounty pipeline right-of-way interest, or segment thereof, located within his or her county, and shall provide the information in those records with respect to a given intercounty pipeline right-of-way interest, or segment thereof, to the taxpayer upon request.