TYPICAL SHEAR STRENGTH - (EFFECTIVE STRESS RELATIONSHIP)PEAK & RESIDUAL SHEAR STRENGTHS – THE PEAK STRENGTH OF CLAYSTONE DERIVED COLLUVIUM IS CHARACTERIZED BY COHESION INTERCEPTS OF 1 TO 5 psi AND FRICTION ANGLES OF 20 TO 25°, WHILE THE RESIDUAL STRENGTH IS CHARACTERIZED BY NEGLIGIBLE COHESION INTERCEPTS AND FRICTION ANGLES OF 8°TO 16°.