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Repon of Soils Investigation <br />2215 South Standard Ave., Proposed Addition <br />Santa Ana. California <br />Page 4 of 27 <br />Job No 40-0613 <br />April 5. 1999 <br />.t <br />1,I <br />6.0 SITE INVESTIGATION <br />6.1 General <br />The field exploration conducted on March 30, 1999 included a site reconnaissance and <br />subsurlace drilling program, which intended to assess the condition and depth of existing <br />subsurface materials. <br />6.2 Exploratora Borings <br />Four borings were excavated to dephs between 5 and 50 fbg. The borings were <br />excavated using a truck-mounted, hollow-stem auger. Soils were continuously logged by <br />an experienced geologist and were visually classified in accordance with the Unified Soil <br />Classification System. The field descriptions have been modified, where appropriate, to <br />reflect laboratory test results. <br />6,3 "Undisturbed" Soil Sampling <br />Undisturbed samples of the near surface soils were obtained at selected intervals in the <br />borings using a split barrel sampler with lined 2 % inch diameter brass sample rings. The <br />drive sampling was conducted in general accordance with ASTM D 3550. The steel <br />sampler was driven into the bottom of the borehole with successive drops of a driving <br />weight. Blow counts required for one foot of sampler have been recorded on the boring <br />logs in the section marked "blows/floot." <br />I <br />l <br />1 <br />l <br />I <br />I