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GEO-ETKA, INC. <br /> Job No: F-12136-24 <br />4 <br />Expansive Soil and Soil Plasticity <br /> <br />The results of test indicated that the near surface soil is non expansive in expansion <br />potential and generally non-plastic. The test results are as follows: <br /> Sample Location Expansion Index Plasticity Index <br /> <br /> B-1 at 2-3ꞌ (Bulk) 18 11 <br /> <br />Expansion index test is as per CBC/ASTM D-4829. Soil Plasticity was determined per <br />ASTM Test Method D-4318. <br /> <br />Chemical Test Data <br /> <br />The on-site soil at an approximate depth of 12 to 18 inches was tested for the following <br />chemical content. <br />Summary of Corrosion Series Data <br /> <br />pH <br />SOLUBLE SULFATES <br />Per CA 417 (ppm) <br />MIN. RESISTIVITY <br />Per CA 643 <br /> <br />7.7 <br /> <br />242 <br /> <br />< 1,150 ohm-cm <br /> <br />Based on the above test data, special cement concrete is not required to be utilized. <br />See 2022 CBC/ACI 318 Section 4.3, Table 4.3.1 and Section 4.4, Table 4.4.1 for other <br />applicable requirements. Special protection need not be used for the underground <br />utility pipes. <br /> <br />Seismic Parameters <br /> Seismic hazard parameters for structural design were evaluated based upon CBC 2022, <br />ASCE 7-16 Standards: <br />2022 CBC Seismic Design Parameters <br /> 33.76299° N <br /> -117.86657° W <br /> D <br /> 1.316g <br />1 0.469g <br /> 1.000g <br /> n/a <br /> 1.316g <br /> n/a <br /> 0.877g <br />n/a <br /> <br />2010 & 2012 N Bush Ave, <br />#100 and #1012/21/2025