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- 22 - <br />• <br />The recommended cut slopes and configurations for individual <br />geotechnical units are presented on Plated 4A through 4D. <br />Plate 4 A shows a design cross section for a cut located <br />---------------------- -------------------------- <br />in sound sandstone. The occurrence of sound sandstone is not <br />------------------ <br />probable within the upper haul road section; it may be applied <br />only for cuts excavated in sound sandstone ledges in the lower part, <br />within Munger Creek valley, As shown on the plate, we re- <br />commend excavation of benches with vertical faces. The height <br />of these benches should be limited to no more than 30 feet. In- <br />termediate benches, no less than 1D feet wide, should be in- <br />corporated into the design, <br />• plate 4 B shows a_design_cross_section for a cut located <br />----------------- ---------------------- <br />in interbedded sandstone and shale. Such a cut is probable at <br />------------------------- <br />the location of the existing road cut No. 2. The recommended <br />cut slope '~ 1 is based largely oh the observation of the <br />behavior of the existing road cut. As discussed earlier, <br />sloughing has been observed from the crest of the cut. To <br />eliminate this sloughing, some protection would be required as <br />indicated on the plate. If not installed, sloughing has to be <br />expected and increased maintenance will be required. <br />Plate 4 C shows a design_cross_section for a cut located <br />---------------------- ------------------------- <br />in_terrace_deposits. The recommended cut slope of 3/4 1 is <br />based again on the observation of the existing cuts in the <br />• <br />