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CITY OF SANTA ANA <br />Planning and Building Agency <br />April 16, 2025 Project <br />Page 3 <br />4.0 Laboratory Tests <br />Relatively undisturbed samples of the subsurface soils were obtained to q <br />r6� ioratory <br />te: <br />testing and analysis for direct shear, consolidation tests, and to d termine in -place <br />moisture/densities. These relatively undisturbed ring samples were obtained by driving a thin - <br />walled steel sampler lined with one -inch -long brass rings with an inside diameter of 2.42 inches <br />into the undisturbed soils. The sampler was driven a total of six inches into undisturbed soils. <br />Bulk bag samples were obtained in the upper soils for expansion index tests and maximum <br />density tests. All test results are included in Appendix B, unless otherwise noted. <br />4.1 Field Moisture Content (ASTM: D 2216) and the dry density of the ring samples were <br />determined in the laboratory. This data is listed on the logs of explorations. <br />4.2 Maximum Density tests (ASTM: D 1557) were performed on typical samples of the <br />upper soils. Results of these tests are shown on Table I. <br />4.3 Expansion Index tests (ASTM: D 4829) were performed on remolded samples of the <br />upper soils to determine the expansive characteristics. Results of these tests are <br />provided on Table II. <br />4.4 Soluble sulfate tests to determine potential corrosive effects of soils on concrete <br />structures were performed in the laboratory. Test results are given in Table III and <br />discussed later in this report. <br />4.5 Direct Shear tests (ASTM: D 3080) were performed on undisturbed and/or remolded <br />samples of the subsurface soils. The test is performed under saturated conditions at <br />loads of 1,000 lbs./sq.ft., 2,000 lbs./sq.ft., and 3,000 lbs./sq.ft. with results shown on <br />Plate A. <br />4.6 Consolidation tests (ASTM: D 2435) were performed on undisturbed samples to <br />determine the differential and total settlement which may be anticipated based upon the <br />proposed loads. Water was added to the samples at a surcharge of one KSF and the <br />settlement curves are plotted on Plates B to C. <br />NorCal Engineering <br />