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L <br /> sample. Water was poured from the bailer into laboratory preserved glass containers in <br /> Ikow preparation for laboratory analyses. <br /> L <br /> 4.6 Stockpiled Soil Sampling <br /> L <br /> One soil sample was collected from the stockpiled soil removed during the June 29, 1993 UST <br /> Lremoval. Prior to sampling, the stockpiled soil was visually inspected for indications of <br /> petroleum contamination. A soil sample was collected by hand-driving a stainless steel sleeve <br /> into the soil until no headspace was present in the sleeve. The sample was then packaged and <br /> handled in accordance with the sampling methodology outlined in Section 4.4.1. <br /> L4.7 Field Quality Assurance / Quality Control Procedures <br /> LSeveral procedures were followed to minimize the potential of cross-contamination between <br /> sampling intervals. The hollow-stem augers were steam-cleaned prior to being delivered to the <br /> LCastle Rock Forest Fire Station, and then steam-cleaned between drilling each borehole. Tetra <br /> Tech set up a staging area for storing the clean sleeves used for collecting soil samples, and <br /> established a decontamination area to clean the split spoon sampler between each sampling <br /> Lao" event. After each sample was obtained, the split spoon sampler was washed in a non- <br /> } phosphate detergent solution, rinsed in clean tap water, and final-rinsed in deionized water. <br /> L <br /> 4.8 Laboratory Analyses <br /> L <br /> Each sample was analyzed for Total Petroleum Hydrocarbons (diesel fractions) by LUFT <br /> L Manual Method 8015M, Aromatic Volatile Organics (including benzene, toluene, <br /> ethylbenzene, and xylenes) by EPA Method 8020, and for organic lead using the DHS LUFT <br /> method. All samples were analyzed by AMER, Inc., a State-Certified laboratory in Sunnyvale, <br /> California. A tabular summary of the analytical sequence is presented in Table 4-1. <br /> L <br /> L <br /> L <br /> TETRA TECH:Castle Rock Forest Fire Station,Preliminary Site Assessment Report Page 12 <br /> L <br />