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Title: Section 1803  •  Size: 2875

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SECTION 1803 - SOIL CLASSIFICATION-EXPANSIVE SOIL

1803.1 General. For the purposes of this chapter, the definition and classification of soil materials for use in Table 18-I-A shall be according to U.B.C. Standard 18-1.

1803.2 Expansive Soil. When the expansive characteristics of a soil are to be determined, the procedures shall be in accordance with U.B.C. Standard 18-2 and the soil shall be classified according to Table 18-I-B. Foundations for structures resting on soils with an expansion index greater than 20, as determined by U.B.C. Standard 18-2, shall require special design consideration. In the event the soil expansion index varies with depth, the weighted index shall be determined according to Table 18-I-C.

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