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Section E16.71 (h) Continued. • (i) Where the slope in the disposal area exceeds 1v:2.6h (36 percent), or such lesser slope as may be designated by the regulatory authority based on local conditions, keyway cuts (excavations to stable bedrock) or rock toe buttresses shall be constructed to stabilize the fill. Where the toe of the spoil rests on a downslope, stability analyses shall be performed in accordance with Section 760.35(c) to determine the size of rock toe buttresses and keyway cuts. Stability analyses have indicated that toe buttress fills are desirable at both locations. The purpose of these are to remove any soft compressible soils in the foundation of the toe slope. Design and construction standards for these toe buttress fills are in the Exhibit 9, Excess Spoil. (j) The fill shall be inspected for stability by a registered engineer or other qualified professional specialist experienced in the construc- • tion of earth and rockfill embankments at least quarterly throughout construction and during the following critical construction periods: (1) removal of all organic material and topsoil, (2) placement of under- drainage systems, (3) installation of surface drainage systems, (4) placement and compaction of fill materials, and (5) revegetation. The registered engineer or other qualified professional specialist shall provide to the regulatory authority a certified report within 2 weeks after each inspection that the fill has been constructed as specified in the design approved by the reguiator•~ authority. A copy of *_he report shall be retained at the minesite. During the construction of the fills, a registered professional engineer or other qualified professional specialist with experience in the construction of earth and rockfill embankments will make quarterly inspections to ensure the stability of the fill. These inspections will be made during the following stages: (1) removal of all organic material and topsoil, (2) placement 816-92