the course would normally define an area within which a contaminant or contaminants must be confined in accordance with governmental requirements the machine includes a chassis with a main member 6 having a forward end supporting a tow arm 7 which in turn supports a block 8 receiving a steering post 10 a tongue is at 11 for steering of a front wheel 12 a post mounted collar 18 is positionable along post 10 wheels at 13 support the rearward end of chassis 6 by means of struts 14 both of which are adjustable in an inclined manner in sleeves 15 having set screws as at 16 the sleeves 15 are secured in place on chassis 6 by a cross arm 17 the length of chassis 6 is such as to permit the machine to be highly maneuverable as well as easily drawn along a ground surface by a workman an elbow shaped airflow inlet at 20 on the main member 6 is in upstream communication via an adapter 19 with conduit 2 for the reception of particulate material into an area 9 below chassis 6 plates at 22 constitute side members supported by hinges at 23 on chassis 6 with the plates oppositely offset and serving to confine particulate material discharged from elbow 20 plate lower edge at 22 a is proximate ground surface g during use of the apparatus a third plate at 24 serves as a barrier and closes the forward end of the area at 9 below main member 6 as best seen in fig4 a deflector at 28 is carried by chassis 6 immediately forward of the outlet end of elbow 20 to impart a rearward component to the downward flow of material exiting elbow 20 apertures at.