This report documents completion of Milestone A.3-1, 'Issue Decision Plan for WVDP Tank Lay-Up,' in Technical Task Plan RL30WT21A, 'Post-Retrieval and Pre-Closure HLW Tank Lay-Up.' This task is a collaborative effort among Pacific Northwest National Laboratory, Jacobs Engineering Group Inc., and West Valley Nuclear Services. The primary objective of the overall task is to develop and evaluate conceptual strategies for preclosure lay-up of the two large high-level waste storage tanks at the West Valley Demonstration Project. This report has two objectives: (1) to present a methodology for selecting a preferred strategy for West Valley Demonstration Project tank lay-up, and (2) to present the results of an example application of the methodology including a sensitivity analysis.