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' APPENDIX B <br /> ' HOLLOW-STEM AUGER DRILLING AND SOIL SAMPLING PROCEDURES <br /> Undisturbed soil samples will be recovered from soil without <br /> introducing liquids into the borings. Soil samples as core will <br /> be taken at 5-feet depth intervals from ground surface to <br /> ' termination depth, or through the aquifer zone of interest for <br /> lithologic logging. <br /> Borings will be drilled with a hollow-stem auger and sampled with <br /> a California or modified California-type split-spoon sampler. <br /> Soil samples will be of sufficient volume to perform the analyses <br /> which may be required, including replicate analyses. <br /> Soil from all borings will be described in detail using the <br /> Unified Soil Classification System and will be logged by a <br /> geologist, civil engineer, or engineering geologist who is <br /> registered or certified by the State of California and is <br /> experienced in the use of the Unified Soil Classification System. <br /> All wet zones above the free water zone will be noted and <br /> accurately logged. <br /> Soil samples will be collected in clean brass or stainless steel <br /> sampling tubes in the split-spoon. Sediment traps will be used <br /> when unconsolidated sands and gravels fall from the sampler <br /> during retrieval. The brass tubes will be cut apart using a <br /> clean knife. The ends of the tubes will be covered with a thin <br /> sheet of Teflon tape or aluminum foil beneath plastic end caps <br /> and sealed with electrical or duct tape and properly labeled. <br /> The samples will be stored on ice at a temperature of 4 degrees <br /> Celsius. <br /> Drill cuttings will be stored on site in 55-gallon drums or <br /> covered with plastic sheeting. Analytical results will be <br /> submitted immediately to the site owner for determination of <br /> appropriate disposal procedures . The soil borings not completed <br /> as wells will be backfilled with a cement grout <br /> f { <br /> I <br /> , <br /> I <br /> I <br /> I <br /> I ' <br /> I I I I I <br /> I { <br /> ��� �I� <br /> 11I rl <br />