Abstract: A dust and debris evacuator is provided for a cut-off saw. The cut-off saw having a rapidly rotating disk-shaped cutting blade for cutting material and thereby producing and ejecting the dust and debris. The evacuator having a channel to receive the ejected dust and debris, and the channel having a front opening facing the cutting blade. A vacuum cleaner is preferably connected to the evacuator to clear the dust and debris from the channel. In a preferred embodiment, the cut-off saw is pivotally mounted to the evacuator.

Abstract: A sensor system is disclosed for a buried waste containment site having a bottom wall barrier and/or sidewall barriers, for containing hazardous waste. The sensor system includes one or more sensor devices disposed in one or more of the barriers for detecting a physical parameter either of the barrier itself or of the physical condition of the surrounding soils and buried waste, and for producing a signal representing the physical parameter detected. Also included is a signal processor for receiving signals produced by the sensor device and for developing information identifying the physical parameter detected, either for sounding an alarm, displaying a graphic representation of a physical parameter detected on a viewing screen and/or a hard copy printout.