// CODE SNIPPET
1802.3.2 Expansive Soils
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Soils meeting all four of the following provisions shall be considered expansive, except that tests to show compliance with Items 1, 2 and 3 shall not be required if the test prescribed in Item 4 is conducted:
- Plasticity index (PI) of 15 or greater, determined in accordance with ASTM D 4318.
- More than 10 percent of the soil particles pass a No. 200 sieve (75 μm), determined in accordance with ASTM D 422.
- More than 10 percent of the soil particles are less than 5 micrometers in size, determined in accordance with ASTM D 422.
- Expansion index greater than 20, determined in accordance with ASTM D 4829.
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Foundations for buildings and structures founded on expansive soils shall be designed in accordance with Section 1808.6.1 or 1808.6.2.
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