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soils, and if the concentration is high enough, can result in degradation of concrete which comes <br />into contact with these soils. The results of the soluble sulfate testing are presented below, and <br />are discussed further in a subsequent section of this report. <br />Sample Identification Soluble Sulfates (%)Sulfate Classification <br />B-1 @ 0 to 5 feet 0.169 Moderate <br />Expansion Index <br />The expansion potential of the on-site soils was determined in general accordance with ASTM D- <br />4829. The testing apparatus is designed to accept a 4-inch diameter, 1-in high, remolded <br />sample. The sample is initially remolded to 50* 1 percent saturation and then loaded with a <br />surcharge equivalent to 144 pounds per square foot. The sample is then inundated with water, <br />and allowed to swell against the surcharge. The resultant swell or consolidation is recorded <br />after a 24-hour period. The results of the EI testing are as follows: <br />Sample Identification <br />B-1 @ 1 to 5 feet <br />Expansion Index <br />0 <br />Expansive Potential <br />Non-Expansive <br />B-2 @ 1 to 5 feet 70 Medium <br />Atterberq Limits <br />Atterberg Limits testing (ASTM D-4318) was performed on selected samples of various soil strata <br />encountered at the site. This test is used to determine the Liquid Limit and Plastic Limit of the <br />soil. The Plasticity Index is the difference between the two limits. Plasticity Index is a general <br />indicator of the expansive potential of the soil, with higher numbers indicating higher expansive <br />potential. Soils with a PI greater than 25 are considered to have a high plasticity, and a high <br />expansion potential. Soils with a PI greater than 18 are not considered to be susceptible to <br />liquefaction. The results of the Atterberg Limits testing are presented on the boring logs. <br />Grain Size Analysis <br />Limited grain size analyses have been performed on several selected samples, in accordance <br />with ASTM D-1140.These samples were washed over a #200 sieve to determine the <br />percentage of fine-grained material in each sample, which is defined as the material which <br />passes the #200 sieve. The weight of the portion of the sample retained on each screen is <br />recorded and the percentage finer or coarser of the total weight is calculated. The results of <br />these tests are presented on the test boring logs. <br />> SOUTHERN G&M Convenience Store # 72 - Santa Ana, CA <br />CALIFORNIA Project No. 16G123-1R <br />Page 9GEOTECHNICAL