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APPENDIX A <br /> FIELD EXPLORATION <br /> E-8556 <br /> Our field exploration was performed on January 5, 1999. Subsurface conditions at the site <br /> were explored by drilling four borings to a maximum depth of twenty-five (25) feet below the <br /> existing grade. The borinas were drilled using a truck-mountecf drill rig. Continuous-flight, <br /> hollow-sterr� augers were used to advance and support the borehules during sampling. <br /> Approximate boring locations were de'�rmined from existing landmarks presented on available <br /> plans. The locations of the borings should be considered accurate only to the degree implied <br /> by the method used. These approximate locations are shown on the Boring Location Plan, <br /> Plate 2. <br /> The field exploration was continuously monitored by an engineer from our office, who <br /> classified the soils encountered and maintained a log of each boring, o�tained representati��e <br /> samples, measured groundwater levels, and observed pertinent site features. <br /> All samples were visually classified in accordance with the Unifiec; Soil Classification System <br /> which is presented on Plate A1, Legend. Logs of the borings are presented in the Appendix <br /> on Plates A2 through A7. The final logs represent our interpretations of the �ield logs and the <br /> results of the laboratory tests of field samples. The stratification lines on the logs represent <br /> the approximate boundaries between soil types. In actuality, the transitions may be more <br /> gradual. <br /> In each boring, Standard Penetration Tests (SPT) were performed at selected intervals in <br /> genera! accordance with ASTM Test Designation D-158G. The split spoon samples were <br /> driven with a one hundred forty (140) pound hammer freely falling tfiirty (30► inches. The <br /> number of blows required to drive the last twelve (12) inches of penetration are called the "N- <br /> value". This value helps to characterize the site soils and is used in our engineering analyses. <br /> Representative soil samples were placed in closed containers and returned to our laboratory <br /> for further examination and testing. <br /> Enrth Cansultanis, Inc. <br /> N� <br />