through the pass. (15) The slab will be part of an insulation box through which the pipeline will be installed. The insulation is required because of the ice-rich permafrost soils in the area., 1976-09, PCA0002-3a-15, Folder: PCA0002-3a. Alyeska Pipeline Service Company : Trans-Alaska Pipeline Construction Collection, 1976-1977, PCA 2. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/17564 Accessed February 22, 2025.