Data from BARGEN GPS stations around Yucca Mountain (YM) have been independently processed using GIPSY-OASIS and GAMIT/GLOBK. The RMS velocity differences between these solutions is 0.06 mm/yr (east component) and 0.10 mm/yr (north), indicating an ability to resolve tectonic signals >0.3 mm/yr with high confidence. Inversion of GPS station velocities for Eastern California Shear Zone (ECSZ) fault parameters produces an unreasonably deep locking depth of ~30 km for the Death Valley-Furnace Creek fault system, contradicting seismological evidence. The GPS cluster locally west of YM observes a strain rate of 17.0 ¿ 1.8 ns/yr, marginally higher than our ECSZ model predicts (13.9 ¿ 0.7 ns/yr). Significantly, the cluster to the east observes 22.3 ¿ 2.1 ns/yr, which is 6.2σ higher than the model (8.6 ¿ 0.7 ns/yr), suggesting that additional sources of strain more local to YM (0.7 mm/yr.