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Standard Operating Procedures Subsurface Soil Sampling using Direct Push Technology Methods 4.4.2 Sampling • Using the percussion/probing machine, drive the sampler into the ground until the upper portion of the targeted sampling interval is achieved. • Unthread and remove the stop-pin from the drive head using extension rods. This will activate the piston tip/rod. • Drive the sampler through the targeted sampling interval to collect the sample. The piston tip/rod will retract as the sample enters the sample tube. • Use the machine hydraulics to pull the sampler from the ground. 4.4.3 Sample Recovery • Once the sampler has been removed from the ground, the sampler must be unthreaded from the drive head,then the cutting shoe unthreaded from the sample tube, and the liner/shoe assembly removed from the sample tube. • Disconnect the cutting shoe from the liner which contains the soil sample. The recovered soil sample may now be viewed, logged, and extracted from the liner for analysis (refer to Section 4.5 for sample containment procedures). 4.5 Sample Containment 4.5.1 General • The soil sample can be removed from the liner following viewing and/or logging. Non-segmented plastic or teflon liners should be cut with a utility knife into approximate 6-inch lengths to facilitate sample extraction or to isolate specific sample zones targeted for analysis. Segmented metal liners can be manually separated. • Once the liner has been separated,the soil sample may be extracted from the individual liner segments with a spoon or spatula. Except for volatile organic samples (see below),the soil sample should be placed into a sample collection pan and homogenized. Place the sample directly into the required sample container. • Once filled,the sample container should be properly capped, cleaned and labeled. Sample chain-of- custody and preservation procedures should then be initiated. • Perform equipment decontamination following containment of the sample. 4.5.2 Volatile Organic Samples • Use of teflon liners is preferred when sampling for analysis of volatile organic compounds (VOC) because these liners are more inert. In order to limit the potential for loss of volatiles,the soil sample should be removed from the liner as soon as possible after sample recovery. VOC soil samples should be selected from a central point within the liner unless another specific sample zone has been Page 9 of 14