[en] This test plan provides a justification and description of surface and borehole seismic surveillance networks operated for the purpose of providing characterization data on the tectonic setting of the reference repository location (RRL) and surrounding area, providing input for seismic design and seismic design confirmation, and providing input to pre- and post-closure performance assessment to support development of a nuclear repository in basalt. Specific seismic surveillance objectives supportive of this purpose are: (1) determine occurrence of seismic events in the RRL, Cold Creek syncline, Pasco Basin, and the Columbia Plateau (i.e., region); (2) determine the locations (hypocenters) of seismic events in the same areas; (3) determine source parameters of causative faults in the RRL and vicinity; and (4) determine characteristics of subsurface vibratory motion due to seismic events