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J indicated in Test Boring No. 5. <br />The following specific values for shear strength were <br />utilized in the various phases of the analysis. <br />Colluvial soil (landslide debris): <br />Residual strength <br />} c = 210 psf <br />= 16° <br />Peak strength <br />l c = 360 psf <br />1 ~ = 23° <br />Man-made fill material: <br />~ = 100 psf <br />= 28° <br />Massive sandstone units above the portal area: <br />c = 1000 psf <br />I 0 = 45° <br />Interbedded sandstone, siltstone, and shale: <br />c/ = 4000 psf <br />J y = 33° <br />For shear in the weakest possible component in the bedrock <br />(weathered shale parallel to the bedding plane direction): <br />c = 1150 psf <br />I ~ = 20° <br />River terrace material: <br />c = 0 psf <br />6 = 38° <br />6 <br />