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3.4 Soil Sampling <br /> Each soil boring will be advanced to the desired total depth at the soil boring location. The <br /> borings will be advanced using a truck-mounted hollow stem auger drilling rig with hollow-stem <br /> continuous flight auger in accordance with ASTM Method D 1452-80 for soil investigations and <br /> sampling by auger borings. All down-hole drilling equipment will be steam cleaned prior to <br /> drilling each soil boring. A Professional Geologist will supervise the field operations and will <br /> record soil lithology and other pertinent data on a field boring log in accordance with ASTM <br /> Method D 2488-84 for visual description and identification of soils. <br /> Soil samples will be collected at 5-foot intervals starting from five (5) feet bgs to total depth. <br /> Continuous soil sampling will be performed in the saturated zone for the monitoring well for <br /> characterization purposes. Samples will be collected using a split-spoon sampler containing three <br /> brass or stainless steel sleeves. The samples will be labeled, sealed, and capped for temporary <br /> storage. All soil sampling equipment will be cleaned in an Alconox solution and double rinsed <br /> prior to each use. <br /> 3.5 Soil Gas Sampling Protocol <br /> A soil gas implant probe will be lowered through the hollow-stem auger to the bottom of each soil <br /> boring at the depth of sampling interest through a series of 3/4" diameter hollow core soil gas <br /> sampling rods. The implant probe will then be driven approximately one foot below the base of the <br /> hole into undisturbed soil. A six to twelve inch interval of bentonite slurry will be placed by tremie <br /> pipe into the bottom of the hole to form a seal between the hollow stem auger and base of hole. A <br /> wait time of about 20 minutes will be allowed in order for the vapor concentrations in disturbed and <br /> undisturbed soil to equilibrate. <br /> The sampling rod will then be pulled back in order to expose the probe to the formation where in-situ <br /> soil gas will be sampled. Summa canisters shall be prepared using procedures described by the <br /> providing analytical laboratory, with the exception of installing a pre-cleaned flow regulator on each <br /> Environmental/LNC/Workplan/Appendix 2.wpd 4 <br />