QTP4B071-6 governs soil and solid sample collection, field analysis, and interpretation of soil sample results.
View QTP4B071-6 on armypubs.army.mil
It covers auger, chip/core, spade, scoop, trowel, trier, and Veihmeyer tube sampling methods. It also includes FT-IR analysis, field analysis equipment, and interpretation of results using MEGs.
How far you need to go down into the soil, the type of soil being sampled, the analytes of concern, and the type of samples you will be collecting (disturbed or undisturbed). (paragraph 1)
Collect samples from the least contaminated areas first then work to the most contaminated areas. (paragraph 2)
Sampling loose soil on the surface or just under the surface. (paragraph 2)
The Veihmeyer tube sampler is used at depths greater than one foot and can be used for depths up to 10 feet. (paragraph 3)