The surface properties of discontinuities, in terms of roughness, wall hardness, and/or gouge thickness, affects the shear strength of the discontinuity. As the discontinuities within each core run, and report in the boring logs in accordance with the descriptions and conditions provided in Table 4-10 below.

Table 4-10: Discontinuity Condition

Condition	Discontinuity Spacing (feet)
Excellent Condition	Very rough surfaces, no separation, hard discontinuity wall
Good Condition	Slightly rough surfaces, separation less than 0.05 inches, hard discontinuity wall
Fair Condition	Slightly rough surfaces, separation greater than 0.05 inches, soft discontinuity wall
Poor Condition	Slickensided surfaces, or soft gouge less than 0.2 inches thick, or open discontinuities 0.05 to 0.2 inches
Very Poor Condition	Soft gouge greater than 0.2 inches thick, or open discontinuities greater than 0.2 inches