e9dd6711_Soil_sampling__RISK_CONTROL
[SPECIFIC JOB STEPS] C. Non-Excavated (Broadacre) Soils Treatment of non-excavated soil is similar to soil piles except that the contamination may spread over a wide area. It differs, however, in that the depths of the contaminated zone are varied. The sampling locations and depths are best laid out in a replicable grid. [RISK ASSESSMENT] How many samples are required? [RISK CONTROL] 
For small areas (less that 10 hectares) use 16 sampling locations per hectare. For larger sites refer to the NEPM for Assessment of Contaminated Sites, see field method bibliography.
Soil sampling
RISK CONTROL