ABSTRACT
In addition to field jobs, which obviously fall into the categories discussed in previous chapters and whose performance uses techniques and equipment discussed in early chapters, there are used for chemical grouts that are either not obvious or else use very special procedures and equipment. Jobs in this category include the sealing of piezometers, the sampling of sands, sealing bolt holes in underground corrugated pipe, and eliminating infiltration or exfiltration through underground concrete and vitreous pipe. The last category includes storm and sanitary sewer lines, and this very special work has grown in volume and importance over the past three decades.
