Previous studies have indicated that the crust and upper mantle beneath the Caltech-USGS large seismic array, SCARLET, is extremely heterogeneous. In this study, Chernov theory has been applied to characterize the crust and upper mantle as a random medium. The data consist of travel-time residuals from plane waves fit to teleseismic arrival times. Amplitude data were not available. Consistent results were obtained for events arriving from the NW, SW and SE and indicate a correlation distance for the inhomogeneities of 25 km and a maximum velocity perturbation of 3.26%. The random medium extends to a minimum depth of 119 km. Although these values are similar to those obtained for other arrays, they indicate that it may be improper to apply Chernov Theory to teleseismic P-waves with dominant frequencies near 1 Hz.