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APPENDIX A i <br /> SUBSURFACE INVESTIGAMN j <br /> f <br /> ' I <br /> The subsurface investigation was performed on <br /> October 14 1993. Three soil borings were <br /> r ee <br /> advanced to a depth of approximately 11.5 feet at k <br /> the site. All borings were drilled using 8-inch <br /> diameter hollow-stern augers. ; <br /> Soil samples were collectedfrom the borings at <br /> approximately 5-foot depth :intervals. The soils <br /> encountered in the borings were logged using the <br /> Unified Soil Classification System (ASTM D-2487). The r <br /> logs of the borings, as well as a key to the <br /> classification of the soil (Figure A-1), are included as <br /> part of this appendix. <br /> Prior to use, all sampling equipment was thoroughly } <br /> cleaned with a tri-sodium phosphate and distilled <br /> water solution or steam cleaned., Soil samples were f <br /> 1 <br /> collected in 2.5-inch diameter brass liners using a <br /> Modified California drive sampler. Upon collection <br /> 4 <br /> from the sampler, the ends of the brass liner were <br /> covered with aluminum foil and then sealed with a <br /> 1I � <br /> plastic cap at each end. The caps were taped t <br /> airtight and labeled appropriately. The samples <br /> were then immediately placed in an ice cooled chest <br /> for transport to a certified analytical laboratory. <br /> The standard penetration resistance blow counts <br /> were obtained by dropping a 140-pound hammer <br /> through a 30-inch free fall. 'The blows per foot <br /> '= t <br /> recorded on the boring logs represent the <br /> h <br /> I <br /> LO"EVASSOCIATES <br /> Page A-1 <br /> E-ao—ental/Gevechni—1/Engineering Services <br /> i <br />