CLASS OF MATERIALS	ALLOWABLE FOUNDATION PRESSURE (psf)d	LATERAL BEARING (psf/f below natural grade)d	LATERAL SLIDING
			Coefficient of frictiona	Resistance (psf) b
1. Crystalline bedrock	200,000	1,200	0.70	-
2. Sedimentary and foliated rock	50,000	400	0.35	-
3. Sandy gravel and/or gravel	12,000	200	0.35	-
4. Sand, silty sand, clayey sand, silty gravel and clayey gravel	6,000	150	0.25	-
5. Clay, sandy clay, silty clay, clayey silt, silt and sandy silt	3,000c	100	-	130

For SI: 1 pound per square foot = 0.0479 kPa, 1 pound per square foot per foot = 0.157 kPa/m

a. Coefficient to be multiplied by the dead load.

b. Lateral sliding resistance value to be multiplied by the contact area, as limited by Section 1804.3.

c. Where the building official determines that in-place soils with an allowable bearing capacity of less than 3,000 psf are likely to be present at the site, the allowable bearing capacity shall be determined by a soils investigation.

d. An increase of one-third is permitted when using the alternate load combinations in Section 1605.3.2 that include wind or earthquake loads.