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CITY OF SANTA ANA Planning and Building Agency April 16, 2025 Project Number 25129-25 Page 14 Approved FOR PERMIT ISSUANCE EXPANSIVE SOIL GUIDELINES Master ID: The following expansive soil guidelines are provided for your project. T EDiotent of these guidelines is to inform you, the client, of the importance of proper design and maintenanee of projects supported on expansive soils. You, as the owner or other interested party, should be warned that you have a duty to provide the information contained in the soil report including these guidelines to your design engineers, architects, landscapers and other design parties in order to enable them to provide a design that takes into consideration expansive soils. In addition, you should provide the soil report with these guidelines to any property manager, lessee, property purchaser or other interested party that will have or assume the responsibility of maintaining the development in the future. Expansive soils are fine-grained silts and clays which are subject to swelling and contracting. The amount of this swelling and contracting is subject to the amount of fine-grained clay materials present in the soils and the amount of moisture either introduced or extracted from the soils. Expansive soils are divided into five categories ranging from "very low" to "very high". Expansion indices are assigned to each classification and are included in the laboratory testing section of this report. If the expansion index of the soils on your site, as stated in this report, is 21 or higher, you have expansive soils. The classifications of expansive soils are as follows: Classification of Expansive Soil* Expansion Index Potential Expansion 0-20 Very Low 21-50 Low 51-90 Medium 91-130 High Above 130 Very High *From Table 18A-1-B of California Building Code (1988) NorCal Engineering