Decontamination procedures prove to be worth the extra effort.
The decontamination of drilling rigs and drilling equipment is required on most sites involving contamination assessment and remediation. Decontamination procedures may include cleaning at the shop and job site prior to drilling. Decontamination may involve using high-pressure steam and approved solvents to remove greases and oils. The decon water may need to be contained and treated or disposed of in accordance with regulations.
Why all the fuss? The procedures sometimes appear to be excessive, but if you understand the ramifications of carrying a few unwanted soil particles from one job site to the next or from place to place on the same job site, importance of decontamination would be more apparent.