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<br /> <br />ASSOCIATED SOILS ENGINEERING, INC. Project No.: 7160.23 <br />2860 Walnut Avenue, Signal Hill CA 90755 January 23, 2024 <br />Tel: (562) 426 -7990 * Fax: (562) 426 -1842 Page 31 <br />Laboratory Tests <br />After samples were visually classified in the laboratory, a testing program aimed at generating sufficient <br />data for subsequent evaluation was established and implemented. <br /> <br />• Moisture Content and Density Tests <br />The undisturbed soil retained within the rings of the Modified California barrel sampler was tested in the <br />laboratory to determine in-place dry density and moisture content. Test results are presented on the Field <br />Logs of Borings / Field Logs of Percolation Borings (see attached "B" Plates). <br /> <br />• Consolidation and Direct Shear Tests <br />Consolidation (ASTM D 2435-11(2020) Test Method) and direct shear (ASTM D3080-23 Test Method) tests <br />were performed on selected relatively undisturbed and remolded samples to determine the settlement <br />characteristics and shear strength parameters of various soil samples, respectively. The results of these <br />tests are shown graphically on the appended “C” and “D” Plates. <br /> <br />• Soil Corrosivity <br />Tests of soluble sulfate and chloride contents were performed in accordance with the latest edition of <br />California Test Methods 417 and 422, respectively, to assess the degree of corrosivity of the subgrade soils <br />with regard to concrete and normal grade steel. Resistivity and pH-value tests were performed in <br />accordance with the latest edition of ASTM G187-23 Test Method and California Test Method 643, <br />respectively, to assess the degree of corrosivity of the subgrade soils with regard to ferrous metal piping. <br />The test results are presented below. <br />Sample ID <br />Sulfate Content 1 <br />(%)/ <br />Exposure Category <br />Chloride Content 2 <br />(ppm) / <br />Exposure Category <br />Resistivity 3 <br />(OHM-cm)/ <br />Degree of Corrosivity <br />Ph-Value3 <br />B-1 @ 1’-5’ 0.002 / S0 14 / C0 1,953 / Corrosive 8.22 <br />1. California Test Method 417 2. California Test Method 422 3. ASTM G187-23 Test Method 4. California Test Method 643 <br /> <br />• Maximum Dry Density/Optimum Moisture Content Test <br />A maximum density test was conducted in accordance with ASTM D1557-12(2021) Test Method, Method A, <br />using 5 equal layers, 25 blows each layer, 10-pound hammer, 18 inch drop in a 1/30 cubic foot mold. The <br />results are as follows: <br />Sample ID Maximum Dry Density <br />(pcf) Optimum Moisture Content (%) Material Classification <br />B-1 @ 1’-5’ 126.0 10.5 SM-ML <br />