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A - 2 <br />SOIL AUGERING AND SAMPLING <br />Subsurface conditions in the area of the portals were <br />investigated by augering and sampling through soil and <br />coring through bedrock in a total of six borings. Three <br />borings (E-1, E-2, and E-3) were drilled from above the level <br />of the proposed portals. The remaining three borings (A-6, <br />A-7, and A-8) were located below (downslope from) the proposed <br />portals in the vicinity of the proposed access road. All <br />borings completed for this investigation were located within <br />the area which has been identified as an area of landslides. <br />The locations of these borings are indicated on Plate 1. <br />Soil borings were advanced using a truck-mounted CME 55 <br />rotary drilling rig supplied and operated by Geotest, Inc. of <br />Grand Junction, Colorado. Four-inch diameter continuous-flight <br />solid-stem augers and six-inch diameter continuous-flight <br />hollow-stem augers were used. Relatively undisturbed soil <br />samples were taken at approximately five-foot intervals using <br />a California barrel. The drilling program was supervised in <br />part by an experienced geotechnical engineer from Geo-Hydro. <br />A qualified technician from Chen and Associates was present <br />throughout the drilling program. <br />The soils encountered in the borings were classified by <br />visual and textural examination in the field, and a complete <br />log for each boring was maintained. These field classifi- <br />cations were supplemented by subsequent office inspection.The <br />terminology used to describe the soils encountered in the <br />borings is shown on Plate A-1, Unified Soils Classification. <br />The key to the logs of soil borings is shown as Plate A-2, <br />and the logs of the borings are presented as Plates A-3 through <br />A-8. <br />orox.c.o conwuNO, Nc <br />