The rig arrives with a standard split-spoon sampler and a 63.5 kg hammer dropping from 760 mm. That is the core of every SPT we run in Luton. The chalk under south Bedfordshire does not read like London clay, and guessing the N-value is the fastest way to blow a budget. Our crew works from the town centre to the M1 corridor, drilling through the Upper Chalk and overlying glacial deposits that define the ground profile here. We log every 75 mm of penetration and deliver the data you need to size footings correctly on variable ground.
In Luton's chalk terrain, N-values below 15 at footing level demand a rethink before concrete goes in.
