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CIMM CDIM Standard Operating Procedure 2.1 Subsurface Soil Sampling '"°'"""'"° Rev.1 10/23/2020 also commonly used. The design is similar to the standard split-spoon except the outside diameter is 2'/2 inches and the inside diameter is 2 inches. 2.4 Shelby Tube Sampler A typical Shelby tube is a thin-walled metal tube with a cutting edge at the toe that is used to recover relatively undisturbed samples. These tubes are available in various sizes, ranging from 2 to 5 inches in outside diameter and 18 to 54 inches in length. A sampler head attaches the tube to the drill rod and contains a check valve and pressure vents. This sampler is advanced into the soil layer, generally 6" less than the length of the tube. The vacuum created by the check valve and cohesion of the sample in the tube cause the sample to be retained when the tube is withdrawn. 2.5 Direct Push Direct push methods drive rods and tools into the subsurface and employ a thin-walled liner to recover soil samples. Samples can either be continuous or depth-discrete soil samples. Continuous core sampling methods use a core barrel, which recovers a soil core from the interval the barrel is advanced through. Soil samples are collected in 1.5-inch to 2.65-inch diameter brass or stainless-steel sleeves inside the inner sample barrel. Typically, the sleeves are removed from the sample barrel and given to the site geologist or engineer for testing, sampling, and lithologic description. The outer-drive barrel is recovered after the total depth of the boring is attained. Test Pit/Trench Excavation When detailed stratigraphy and soil characteristic examination is necessary, large sections of soil can be removed with a backhoe. Soil samples are collected from a test pit or trench using a trowel, scoop, or coring device. 2.7 Volatile Organic Compounds (VOCs) VOCs are chemicals that are emitted from certain solids or liquids, and include a variety of chemicals. Samples that will be analyzed for VOCs should be collected and contained in a manner that minimizes disturbance of the sample, which could result in loss of VOCs. VOC samples are typically conducted with TerraCore or EnCore samplers. 3. PROCEDURE This section describes the procedures to ensure the quality and integrity of samples when collecting subsurface soil samples. The details within this SOP should be used in conjunction with project work plans. The project work plans will generally provide the following information: • Sample collection objectives; • Soil sample locations and depths; • Numbers of soil samples and their volume; • Analysis to be conducted for each sample; • Specific quality control (QC) procedures and sampling required; and 2