Most samples are present on soil surface except
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An accurate soil sample is composed of multiple, smaller samples called cores. Individual cores include soil from the surface down to the depth at which grasses or plants will draw most nutrients. Each final sample for an area should combine at least 10 soil cores from random spots through the area.
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Surface soil samples can be used to investigate contaminants that are persistent in the near surface environment. Soil samples may be collected using a variety of methods and equipment depending on the depth of the desired sample, the type of sample required (discrete or composite), and the soil type
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