ABSTRACT
Historical note: This chapter presents a revised version of Glynn and Brown (1996), a study that discussed in detail the theory and application of inverse and forward geochemical modeling with the computer codes PHREEQC, PHREEQM, and NETPATH, and the application of these codes in modeling contaminated groundwaters in the Pinal Creek basin (Arizona, USA). The modeling study focuses on the evolution and transport of acidic, reducing, waters because those conditions control the transport of metal contaminants in the groundwaters of the Pinal Creek basin. In addition to presenting the essential results and conclusions of Glynn and Brown (1996), this chapter provides a 15-year perspective on the original study. It discusses follow-up work done in the Pinal Creek basin, comments on lessons learned from investigations at the site, and provides suggestions that may be useful to geochemical and modeling investigations at other sites.
