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Soil Sampling Field Standard Operating Procedure SWE-FSOP-405;Revision 1 Ahtna Southwest Environmental Operations 9. Make notes on the boring log regarding the soil characterization and geologic features, including any staining or odors (ensure no inhalation hazard exists). See SWE-FSOP-201 (Soil Classification). Note that samples should generally be collected before the characterization of soil to preserve the integrity of the volatile samples. 10. Wipe down the jar threads to remove any bits of soil and close the jar with the lid, and wipe the outside of the jar using a paper towel or other clean, dry wipes. 11. Label the sample container with the appropriate information;typically, use a label with waterproof adhesive, or if not, secure the label with clear tape. 12. Place the sample container in the shipping container,typically a chilled cooler, and proceed with further sampling. 13. When sampling is complete, all reusable downhole/sampling equipment and any drill rig components that may have come in contact with contaminated soil should be decontaminated before next use. For specific types of sampling, follow the steps outlined in the following sections. 4.3.1 Discrete Sampling Typically, discrete sampling is used unless otherwise dictated for the specific project.The locations and depths where discrete samples are collected should be explained in a site-specific work plan. 4.3.2 Composite Sampling Composite sampling may only be conducted if previously approved in a site-specific work plan. If possible, coordinate with the testing laboratory if laboratory composting is possible. Composite samples should have equal aliquots of soil collected as discrete samples from all sub- locations. If composite samples are necessary, aliquots of volatile samples are collected directly into laboratory-supplied jars and preserved immediately according to directions from the laboratory. Aliquots of non-volatile samples should be homogenized before placing into laboratory-supplied jars. 4.3.3 Incremental Sampling Methodology ISM sampling may only be conducted if previously approved in a site-specific work plan.The method uses primary, replicate, and triplicate samples of the decision unit collected from many(30-50) sub- samples (aliquots) to create a statistically valid result. See SWE-FSOP-407 (Soil Incremental Sampling Methodology).The ISM sampling approach shall be conducted following the Interstate Technology& Regulatory Council (ITRC) Incremental Sampling Methodology Guidance (ITRC, 2012). ISM sampling is similar to a composite sample in that equal aliquots of soil are collected in each gridded or celled decision unit (grid/cell dimensions to be determined based on decision unit size), using a random number generator to establish random planer and depth coordinates. A duplicate and triplicate sample should be collected using the same techniques as the primary sample to verify that the ISM sample truly represents the decision unit. Care should be taken to ensure triplicate samples are not collected from co-located or adjacent locations. Page 12 of 15