SR2400282 (3) - Laserfiche WebLink

Home Browse Search

Soil Sampling Using Direct Push SOP • Decontamination of sampling tubes, probe rods, adaptors, non-expendable points and other equipment that contacts the soil is necessary to prevent cross-contamination of samples. Sampling using disposable liners within the Macro-core® sample barrel can reduce the potential for cross contamination. Interferences having the potential to impact the quality of the final product may include: • Rock or impenetrable soil - a different drilling method may be required, or it maybe necessary to move to another location in order to achieve soil sampling objectives. • Consideration of the appropriate liner material based on sample interferences should be determined prior to mobilizing to the site. In general, use of cellulose acetate butyrate or polyvinyl chloride liners are typical. Additional liner materials are available upon request. • During sampling, the bottom portion and outside of the sampling tube can be contaminated with soil from other depth intervals. Excess soil should be carefully wiped from the outside surface of the sampling tube and the top 3 inches of the sample should be discarded before extruding the sample into a sample jar if it appears the soil fell into the borehole from the sidewall above. • Note that sample recovery less than 100%means that some of the sample has fallen out of the sample tube and the depth interval of the sample should be adjusted based on the assumption that the top of the sampler was advanced to the top of the intended sample interval and no deeper. This assumes that the soil near the top of the sampler is from the intact sample interval and not material that had fallen into the borehole from above (see discussion item above). • Sample barrels should not be driven at intervals greater than the barrel length. In tight formations (e.g. stiff clays) it may be necessary to drive a sample barrel at a shorter interval than designed to avoid overfilling the liner. An overfilled liner can become logged in the sample barrel and cause significant delays recovering the liner or result in the loss of the sample interval. • In general, as the length of the tube driven increases, the accuracy of the depth interval decreases, and is exaggerated in tighter formations. 5_0 Personnel Qualifications/Responsibilities: Personnel performing this procedure are required to have the following qualifications: • HSSE Training in accordance with Health, Safety, Security, and Environment Practice • Antea Group personnel must have sufficient training to meet the project objectives and be approved/calibrated in the Antea Group Workforce Optimization Database for SOP implementation. The minimum roles involved and their responsibilities in this procedure includes: • Project Manager—Responsible for evaluating, communicating, and upholding the regulatory, client, and other applicable requirements associated with performing this procedure as part of a project-specific scope of work. • Project Professional—Responsible for creating project-specific assignments where this procedure is required and ensuring execution of this procedure in accordance with the identified requirements described in this procedure. • Staff Professional—Responsible for implementing project-specific assignments Control#:AG-10040-00 Page 4 of 8 File name:Soil Sampling Using Direct Push SOP