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Atterber Limits: imits: The liquid and plastic limits ("Atterberg Limits") were determined in accordance with <br />ASTM Test Method D4318 for engineering classification of fine-grained material. <br />Sample Location <br />Liquid Limit (%) <br />I Plastic Limit (%) <br />I Plasticity Index (%) <br />B-LGC-1 @45' <br />Non -Plastic <br />Non -Plastic <br />Non -Plastic <br />B-LGC-1 @47.5' <br />21 <br />16 <br />5 <br />B-LGC-2 @47.5' <br />25 <br />18 <br />7 <br />B-LGC-3 @20' <br />29 <br />17 <br />12 <br />B-LGC-3 @50' <br />27 <br />17 <br />10 <br />Chloride Content: Chloride content was tested in accordance with Caltrans Test Method (CTM) 422. <br />The results are presented below: <br />Sample Location Chloride Content, ppm <br />B-LGC-1 @1-5' 130 <br />Soluble Sulfates: The soluble sulfate contents of selected samples were determined by standard <br />geotechnical methods (CTM 417). The soluble sulfate content is used to determine the appropriate <br />cement type and maximum water -cement ratios. The test results are presented in the table below: <br />Sample <br />Location <br />Sample <br />Description <br />Sulfate <br />Content (%)* <br />Sulfate Exposure** <br />B-LGC-1 @1-5' <br />Clayey SAND <br />0.009 <br />Negligible/SO <br />*Expressed as the percentage of water-soluble sulfate (SO4) in soil, percentage by weight. <br />** ACI 318R-14 Table 19.3.1.1 <br />Minimum Resistivi , and pH Tests: Minimum resistivity and pH tests were performed in general <br />accordance with CTM 643 and standard geochemical methods. The electrical resistivity of a soil is a <br />measure of its resistance to the flow of electrical current. As a results of soil's resistivity decreases <br />corrosivity increases. The results are presented in the table below: <br />Sample Location <br />Sample Description <br />pH <br />Minimum Resistivity (ohms -cm) <br />LGC B-1 @1-5' <br />Clayey Sand <br />7.76 <br />2100 <br />Consolidation: Consolidation tests were performed on selected, relatively undisturbed ring samples <br />(Modified ASTM Test Method D2435). Samples (2.42 inches in diameter and 1 inch in height) were placed <br />in a consolidometer and increasing loads were applied. The samples were allowed to consolidate under <br />"double drainage" and total deformation for each loading step was recorded. The percent consolidation for <br />each load step was recorded as the ratio of the amount of vertical compression to the original sample height <br />Project No. 213031-01 Page C-2 December 16, 2021 <br />City Council 18 — 869 10/3/2023 <br />