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TO E RO E K SOP No.005,REv.2 ASSoc1ATE5,INC BULK MATERIALS SAMPLING I PAGE 3 collected for volatile organic compound analysis should not be composited. The following sections provide detailed procedures for sampling bulk materials with a trier, scoop, or trowel, and with a grain thief. 2.1 SAMPLING BULK MATERIALS WITH A TRIER, SCOOP, OR TROWEL A typical trier (Figure 1) is a long tube with a slot that extends almost its entire length. The tip and edges of the tube slot are sharpened to allow the trier to cut a core after being inserted into the material. A trier is most useful when sampling moist or sticky solids and powdered or granular material with a particle diameter less than half the diameter of the trier. Sampling triers are usually made of stainless steel and have wooden handles. Triers are 24 to 40 inches long and 0.5 to 1.0 inch in diameter. They can be purchased from laboratory supply companies. A scoop or trowel may be used for sampling bulk materials as well as dry, granular, or powdered material in bins or other shallow containers. A scoop is preferred over a trowel because the scoop is usually made of materials less subject to corrosion and chemical reactions. A trowel is shaped like a small shovel; the blade is usually 3 to 5 inches long and has a sharp tip. A scoop is similar to a trowel, but the blade is usually more curved and has a closed upper end to contain the sampled material. Scoops are available in different sizes and shapes; stainless-steel and polypropylene scoops with blades 3 to 6 inches long are recommended. Trowels can be purchased from hardware stores; scoops are generally available from laboratory supply companies.