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APPENDIX A <br /> Field Procedures <br /> Drilling and Decontamination <br /> Soil bonngs were advanced using a truck-mounted hollow-stem auger drilling ng Six-inch <br /> diameter (I D ) augers were used for dnlhng soil borings <br /> To reduce the potential for cross contamination, auger flights were steam cleaned prior to <br /> use at the Site and before drilling each soil boring Sampling equipment was washed with <br /> a laboratory-grade detergent (e.g , Alconox) and double-rinsed with distilled water between <br /> sampling points. <br /> Soils generated during drilling activities were placed in 55-gallon drums and stored on site, <br /> pending evaluation of disposal options. <br />• Soil Bonn, Samp)1ng <br /> Soils were sampled by driving the sampler every 5 feet from ground surface to the terminal <br /> depth from each boring. When possible, the bottom brass tube from each boring was <br /> retained for laboratory analysis The remaining tubes were used for lithologic description <br /> and head space analysis in the field <br /> Soil samples were collected using a 1.5-inch diameter by 18-inches long, split-spoon sampler <br /> advanced driven into the soil <br /> Selection of soil samples for chemical analysis were based on field observations, such as <br /> visual indications of staining <br /> Drilling and logging was performed under the direction of a California Registered Geologist <br /> (RG) Soil samples were lithologncally described and classified using the Unified Sod <br /> Classification System <br /> i <br />