Normally, thin-walled tube samplers and many piston samplers are applied to collect undisturbed soil specimen. The diameter with the undisturbed soil sample is around 100 mm and ranges from 150mm to 200mm for rocks. Not adhering to proper sampling and dealing with treatments can contaminate or change the soil sample, https://comfortablecomputergaming01009.ltfblog.com/30854346/details-fiction-and-soil-testing-and-investigation-bd