Abstract: A method and apparatus for removing from soil particles within a predetermined size range, comprises a movable frame, and a digger attached thereto to excavate soil as the frame is moved. A first separater to which the excavated soil passes allows material of less than a first predetermined size to pass through and discards material of size greater than said first predetermined size. A second separater is adapted to retain material of size greater than a minimum of said predetermined size range and to discard material of size less than said minimum. The retained material is stored.