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3 4 3 Lithological Logging <br /> � I <br />' Tetra Tech's geologist logged each boring by both continuous inspection of the drill cuttings <br /> and by examination of samples collected at each sample interval Detailed logs completed for <br /> each boring include a geotechnical description and Unified Soil Classification designation of <br /> soils encountered, blow counts required to collect samples, instrument measurements, and <br />' general comments (such as odor) A description of site geological conditons is presented in <br /> Section 3 0 Copies of all boring logs are presented in Appendix C <br /> ' 3.5 Field Quality Assurance / Quality Control Procedures <br /> ' Several procedures were followed to minunize the potential of cross-contamination between <br /> sampling intervals The hollow-stem augers were steam-cleaned prior to being delivered to the <br />' Stockton Developmental Center, 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 /> 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 /> 3.6 Laboratory Analyses <br /> Each soil sample was analyzed for Total Petroleum Hydrocarbons (TPH) by EPA Method <br />' M8015 (calibrated to analyze diesel and bunker fuel fractions) All samples were analyzed by <br /> AMER, Inc , a State-Certified laboratory in Sunnyvale, California <br /> I <br /> TETRA TECH Stockton Developmental Center,Phase II Site Investigation Report Page 11 <br /> 1 <br />