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4.0 SUBSURFACE EXPLORATION <br />4.1 Scooe of Exoloration/Samolino Methods <br />The boring was advanced with a hollow-stem auger by a conventional truck-mounted drilling rig. <br />Representative bulk and relatively undisturbed soil samples were taken during drilling. Relatively <br />undisturbed soil samples were taken with a split barrel "California Sampler" containing a series <br />of one inch long, 2.416+ inch diameter brass rings. This sampling method is described in ASTM <br />Test Method D-3550. In-situ samples were also taken using a 1.4+ inch inside diameter split <br />spoon sampler, in general accordance with ASTI'4 D-1586. Both of these samplers are driven into <br />the ground with successive blows of a 140-pound weight falling 30 inches. The blow counts <br />obtained during driving are recorded for further analysis. Bulk samples were collected in plastic <br />bags to retain their original moisture content. The relatively undisturbed ring samples were <br />placed in molded plastic sleeves that were then sealed and transpofted to our laboratory. <br />The approximate location of the boring is indicated on the Boring Location Plan, included as <br />Plate 2 in Appendix A of this report. The Boring Log, whlch illustrates the conditions encounterd <br />at the boring location, as well as the results of some of the laboratory testing, is included in <br />Appendlx B. <br />Pavements <br />Asphaltic concrete pavements were present at the ground surface at the boring location. At this <br />location, the pavement section consists of 4%r inches of asphaltic concrete with 18t inches of <br />underlying aggregate base. <br />Artificial fill soils were encountered beneath the existing pavements at the boring location, <br />extending to depths of 41/zt f*t below existing site grades. The fill soils generally consist of <br />loose gravelly fine to coarse sand with some silt. The fill soils possess a disturbed appearance <br />resulting in their classification as fill. <br />p,nli,tlr Proposed ryhn Sign - Santa Ana, CA <br />Project No. 16G208-1 <br />Page 4 <br />The subsurface exploration conducted for this project consisted of one (1) boring advanced to a <br />depth of 50* feet below the existing site grades. The boring was logged during drilling by a <br />member of our staff. <br />4.2 Geotechnical Conditions <br />Artificial Fill