Each of Fisher’s truck-mounted drilling rigs is equipped with a hydraulic operated 65 kg hammer, falling 760 mm, and required to drive a 50mm diameter spoon sampler 300 mm into the subsurface material.  On-board centrifugal water pumps serve the purpose of washing the split spoon sampler to avoid cross contamination of samples.  Additionally two auger-drilling machines, the Big Beaver and a lightweight portable Pionjar, equipped with hammer operation can be used in areas that are inaccessible to truck-mounted rigs.