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Page 4 ~) 2.2 Available Resource Figure 2-2 shows the schematic cross-section of the resource of interest. The Boies Bed (L-SA bed) is overlain by the L-SB, -SC and -SE beds. Prior solution mining plans by White River Nahcoli[e, Inc. have not considered recovery of the resource in the L-SB, -SC and -SE beds as they were relied upon to maintain a barrier between the cavern and overlying waters above the dissolution surface. With the new mining technique, recovery of the resource in the L-SE, -SB and -SC beds is possible. The grade of the L-SB and -SC beds is typically 50% nahcolite, with the L-5E compazable to the Upper Boies Bed (UBB), 80% to 85% nahcolite. Underlying the UBB are the Oil Shale Marker Bed (OSMB) and the Lower Boies Bed (LBB). The grade of the OSMB and LBB aze around 50% and 80%, respectively. Table 2-1 lists the thicknesses of the various beds and the equivalent nahcolite thickness for all holes in and near the first production panel and within the White River Nahcolite, Inc. lease area. The equivalent thickness is calculated by adding together 80% of the height of the L-SE, UBB and LBB and 50% of the height of the L-SB, L-SC and the OSMB. The data sources shown in Table 2-1 aze of variable quality. Some of these holes have been cored, others have j been cored only in the Boies Bed, and some intervals have been estimated. In general, the Boies Bed is replaced by halite to the north, and to the south, the L-SE, -SC and -SB and Boies beds aze progressively truncated by the dissolution surface. Figure 2-3 shows atwo-dimensional contour and athree-dimensional representation of the equivalent nahcolite thickness in the area of interest. At locations EX-I and EX-2, the equivalent nahcolite thickness is 40 to 45 ft because of good thickness of both the L-5E and the Boies beds. At all other hole locations, the equivalent nahcolite thickness is less than 41 ft. The equivalent thickness was estimated by assuming the nahcolite content of the L-SE, UBB and LBB at 80%, and 50% for the L-SB and -SC and OSMB. 2.3 Overlying Stratigraphy The overlying Stratigraphy of interest in assessing the permit implications of high- extraction solution mining aze the location and quality of aquifers and aquitazds, and the location of the minable oil shale resource. Figure 2-1 shows the general Stratigraphy and definition of the ~ upper and lower aquifers. Table 2-2 lists the typical depths and thicknesses of the overlying strata. Agapito Associates, Inc.