Abstract: A spoil treatment plant configured within a frame for easy relocation. The spoil treatment plant comprises a dump bin held within the frame for receiving spoil, a vibrating screen separator mounted in the frame away from the dump bin, an elevator located within the frame, the elevator transporting spoil from the dump bin to the vibrating screen separator, a slurry tank within the frame below the vibrating screen separator that collects slurry; and a chute adjacent the vibrating screen separator that delivers spadeable fill. The vibrating screen separator separates the spoil into spadeable fill delivered from the chute and fine slurry delivered to the slurry tank. The spoil treatment plant may also comprise a further dewatering element, such as a rotary press, that extracts water from the spadeable fill.

Abstract: A perimeter safety device comprises a laser, detector, controller and an alarm. The laser emits optical laser radiation into a monitored zone. Laser radiation reflected from an object in the monitored zone is detected by the detector and a range to the object is determined by the controller. An alarm is activated if the object is determined to be in a location that is not authorized. The invention also reside in a network of perimeter safety devices that together define a monitored area formed of monitored zones. A central controller may define a pre-defined “safe” path through the monitored area.

Abstract: A process for safely excavating to reveal underground utilities. The process includes the steps of: identifying known utilities; planning an excavation trench; excavating the trench by: (i) making a cut of the excavation trench at a selected depth; (ii) extracting material from the trench; (iii) observing the trench; (iv) adjusting the depth of cut; and repeating (i) to (iv) until the process is complete.

Abstract: A spoil treatment plant configured within a frame for easy relocation. The spoil treatment plant comprises a dump bin held within the frame for receiving spoil, a vibrating screen separator mounted in the frame away from the dump bin, an elevator located within the frame, the elevator transporting spoil from the dump bin to the vibrating screen separator, a slurry tank within the frame below the vibrating screen separator that collects slurry; and a chute adjacent the vibrating screen separator that delivers spadeable fill. The vibrating screen separator separates the spoil into spadeable fill delivered from the chute and fine slurry delivered to the slurry tank. The spoil treatment plant may also comprise a further dewatering element, such as a rotary press, that extracts water from the spadeable fill.

Abstract: A transportable and interchangeable tank for collecting and disposing of mud, slurry or other fluid waste material adapted to be transported on a transport vehicle having an air evacuation connection specially adapted to connect directly to and seal with a complementarily connection of a vacuum pump on the vehicle, whereby the connective dead space between the tank and the pump is substantially minimised in order to improve the efficiency of evacuating air from and thus filling the tank.