1 The Main Silt stratum was not incorporated as separate layer within the 3D visualization of the generalized stratigraphic interpretation of the subsurface. Since the Main Silt is compositionally similar to the North Olive and Rand strata and simply differentiated based on the absence of the B- and/or C-Clay, the Main Silt was incorporated into these two shallow strata within Leapfrog Hydro™. Further description of the Main Silt is included in Section 2.1.8.