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` APPENDIX A <br /> 1 SUBSURFACE INVESTIGATION AND SOIL SAMPLING <br /> The subsurface investigation was performed on D4ay 4 Drilling <br /> and 5, 1995 using a truck-mounted drill rig equipped <br /> with a 8-inch hollow-stem auger. Five soil borings were <br /> drilled to depths of approximately 15 feet and one soil <br /> ' boring was drilled to a depth of approximately 55 feet. <br /> The standard penetration resistance blow counts were <br /> ' obtained by dropping a 140-pound hammer through a <br /> 30-inch free fall. The blows per foot recorded on the <br /> ' boring logs represent the accumulated number of blows <br /> required to drive the sampler the last 12 inches of the <br /> interval indicated. Soil samples were collected at <br /> ' approximately 5-foot depth intervals or significant <br /> changes in lithography using a 2.5-inch diameter <br /> modified California split-spoon sampler. <br /> Soils encountered in the borings were logged using the <br /> Unified Soil Classification System (ASTM D-2487). The <br /> logs of the borings, as well as a key to the <br /> classification of soil (Figure A-1), are included as part <br /> of this appendix. <br /> Soil samples for laboratory analysis were collected in Sampling Protocol <br /> ' brass liners, the ends covered in aluminum foil, taped <br /> and capped with plastic end caps. The samples were <br /> then labeled, placed in a chilled cooler, and <br /> transported to a state-certified analytical laboratory <br /> with chain of custody documentation. Soil from each <br /> sample was also monitored with an ovM. Soil was <br /> placed in a ZiplockTM bag. After a minimum of five <br /> minutes, the ovM probe was used to pierce the bag <br /> and record the organic vapor levels present. All <br /> ' LOWIEYA=IATES <br /> Emvmmamal s <br /> /G..e q.l/Eng...g S., Pae A-1 <br />