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5.3 Soil Sampling <br /> 5.3.1 Shallow Subsurface Soil Sampling <br /> 5.3.1.1 Grab Sampling <br /> Sample locations will be selected as outlined in Section 5.6. <br /> Subsurface soil samples will be collected by excavating to a depth <br /> of no greater than 0.5 feet below ground surface (bgs) using a <br /> stainless steel trowel, which will be decontaminated between <br /> sample locations. If necessary, an aliquot will be collected for <br /> VOC analysis before homogenizing the sample. Samples will be <br /> homogenized by mixing the soil with a trowel. After <br /> homogenization, material in the pail will be transferred into the <br /> appropriate sample containers. To prevent potential contaminant <br /> migration to or from the sample, containers will be filled to the top <br /> with measures taken to prevent soil from remaining on the lid <br /> threads prior to being sealed. After the sample containers are <br /> filled, they will be immediately sealed, chilled, and processed for <br /> shipment to the lab. <br /> When field screening is to be performed on the sample, an aliquot <br /> of soil will be obtained from the sample pail, placed in a plastic <br /> baggie and chilled until processed by the field analyst. <br /> Steel trowels will be decontaminated before each use. The pails <br /> are disposable and will be discarded after each use. <br /> 5.3.1.2 Composite Sampling <br /> Composite sample locations will be selected as outlined in Section <br /> 5.6. A number of grab samples from different locations will be <br /> collected by digging with a steel trowel and put into a sample- <br /> dedicated disposable pail. If necessary, an aliquot will be collected <br /> for VOC analysis before homogenizing the sample as a grab <br /> sample. Samples will be homogenized by mixing the soil with a <br /> trowel. Material in the pail will be transferred into the appropriate <br /> sample containers. To prevent potential contaminant migration to <br /> or from the sample, containers will be filled to the top with <br /> measures taken to prevent soil from remaining on the lid threads <br /> prior to being sealed. After the sample containers are filled, they <br /> will be immediately sealed, chilled, and processed for shipment to <br /> the lab. <br /> Steel trowels will be decontaminated before each use. The pails <br /> are disposable and will be discarded after each use. <br /> 09:C:\MyFiles\PROJECT\Tracy_Tire\QASP\QASP_0339.wpd-11/30/98 5-2 <br />