systems. Non-in siru systems receive a three sentence mention. For the novice, a good oveniew of bacteria types, their metabolism and requirements is given. The design section has sketches of several types o f in situ designs and numerous useful taliles are presented. Several pages are de.oted to intrinsic bioremediation and ho\, it is different than the "no action" approach. The chapter finishes with an ex:imple problem. Petroleuni-contaminated soil and groundwater resulted from the removal of a gasoline and a diesel underground storage tank. Remediation is performed using a bioremediation trench across the groundwater flow path.
The authors starts the 55 page Chapter 7. Design of Pump and Treat Systems, with an acknowledgment that the use of purnp-and-treat systems has declined recently due to their long treatment times and questionable effectiveness. Since thc chapter contains a good overview of a i r stripping and liquid phase carbon adsorption, it is worth reading. The example is for a 40 to 90 gpni system wing carbon adsorption.
A brief summary of other remediation systems is given in the six-page Chapter 8. Solidification/stabilization, vitrification, containment cutoff walls. soil flushing, and phytoremediation are mentioned as in sitzi methods. For non-in situ methods, the authors mention; excavation and disposal, incineration, asphalt, and soil washing. Thel-mal desorption, solvent washing. and other technologies are not even mentioned. This book is certainly not compre-hensi\e with regards to all current available proven soil or groundwater remediation technologies. It also can not be considered a design manual, even for the remediation technologies emphasized. Nonetheless, it is a useful book, in that for someone new, it provides a good overview of se.er:il in sitzi technologies. For the seasoned veteran who is frequently on-site in remote locations at late hours, with little o r no reference materials available, this liook can be helpful. Also, the book is small and portable. For someone working with petroleum hydrocarbon contamination, there are numerous useful data tables. The pump and piping calculations and others. can be very useful for