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4.0 SUBSURFACE EXPLORATION <br />4.1 Scope of Exploration/Sampling Methods <br />The subsurface exploration conducted for this project consisted of two (2) borings advanced to <br />depths of 153: feet and 50* feet below presently existing site grades. Both of the borings were <br />logged during drilling by a member of our staff. <br />The borings were advanced with hollow-stem augers, by a conventional truck-mounted drilling <br />rig. Representative bulk and relatively undisturbed soil samples were taken during drilling. <br />Relatively undisturbed soil samples were taken with a split barrel "California Sampler" containing <br />a series of one inch long, 2.416* inch diameter brass rings. This sampling method is described <br />in ASTM Test Method D-3550. In-situ samples were also taken using a 1.4* inch inside diameter <br />split spoon sampler, in general accordance with ASTM D-1586. Both of these samplers are <br />driven into the ground with successive blows of a 140-pound weight falling 30 inches. The blow <br />counts obtained during driving are recorded for further analysis. Bulk samples were collected in <br />plastic bags to retain their original moisture content. The relatively undisturbed ring samples <br />were placed in molded plastic sleeves that were then sealed and transported to our laboratory. <br />The approximate locations of the borings are indicated on the Boring Location Plan, included as <br />Plate 2 in Appendix A of this report. The Boring Logs, which illustrate the conditions encountered <br />at the boring locations, as well as the results of some of the laboratory testing, are included in <br />Appendix B. <br />4.2 Geotechnical Conditions <br />Pavements <br />Pavements were encountered at the ground surface at both of the boring locations. The <br />pavements consist of 9* inches of asphaltic concrete pavement underlain by 13: inch of <br />aggregate base at Boring No. 8-1 and 93: inches of Portland cement concrete underlain by la <br />inch of aggregate base at Boring No. B-2. <br />Artificial Fill <br />Artificial fill soils were encountered beneath the pavements at both boring locations extending to <br />depths of 21h to 3* feet below the existing site grades. The fill soils consist of loose silty fine <br />sands to fine sandy silts. These soils possess a disturbed, mottled appearance, resulting in their <br />classification as artificial fill. <br />' SOUTHERN G&M Convenience Store #72 - Santa Ana, CA <br />CALIFORNIA PrOJect No. 16G 123-1R <br />GEOTECHNICAL Page 6