a system for uncovering and sealing a narrow trench . the system comprises several subsystems , including a work machine , a frame for providing a seal with the surface to be trenched , a saw blade , a vacuum system , a system for placing product , and a resealer . the blade includes rotatable tooth bits , which may be rotated and secured to create a blade for narrower or a wider trench . a removable cover and the blade are easily changeable . a surface engaging member on the frame is manipulated to maintain a seal with changing ground surfaces . additionally , the vertical location of the blade within the frame is adjustable to create a deeper or shallower trench .