Laserfiche WebLink
i' A-2 <br />i <br />• <br />A-1 SOIL AUGERING AND SAPSPLING ~ <br />'. i <br />Subsurface conditions in the area of the portals were <br />L investigated by augering and sampling through soil and <br />coring through bedrock in a total of six borings. Three <br />i <br />borings (E-1, E-2, and E-3) were drilled from above the level <br />I; of the proposed portals. The remaining three borings (A-6, i <br />A-7, and A-8) were located below (downslope from) the proposed', <br />portals in the vicinity of the proposed access road. A11 <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 as 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 shows as Plate A-2, <br />and the logs of the borings are presented as Plates A-3 throug2 <br />• A-8. <br /> <br />ap.MO~D COMfWMG,K <br />