[en] As part of environmental restoration activities at the Hanford Site, Bechtel Hanford, Inc. is conducting a series of evaluations to determine appropriate release conditions for specific facilities following the completion of decontamination and decommissioning projects. The release conditions, with respect to the residual volumetric radioactive contamination, are termed authorized limits. This report presents the summary of the supporting information and the final application for approval of derived authorized limits for the release of the 190-C trenches and the 105-C process water tunnels. This document contains two volumes; this volume (Vol. 1) contains a brief description of the facilities; a summary of the source term determination (found in detail in Vol. 2); a description of the radiation exposure scenarios for estimating individual radiation doses; a summary of the calculated doses; and a discussion of the as low as reasonably achievable groundwater protection, and other considerations