Provides a review of eight monitoring efforts in southern Arizona to highlight their accomplishments and to critique their efficacy and overview of important attributes of a monitoring program. This review of projects and successful attributes will provide an assessment framework to better guide the development of the Pima County Ecological Monitoring Program.

The SDCP recognizes the important links between groundwater, streamflow, and vegetation that still exist along some streams and springs in Pima County. Unfortunately, depletion of aquifers has altered streamflow and associated groundwater-dependent vegetation along the Santa Cruz River and other streams. The main purpose of this report is to establish priorities for potential expansion of Pima County's existing aquifer monitoring for groundwater-dependent ecosystems.

This health consultation evaluates tetrachloroethylene (perchloroethylene, perc, PCE) and trichloroethylene (TCE) results obtained from groundwater monitoring wells in 2004. The primary public health concerns were exposures to children by incidental contact with groundwater used for watering yards and potential exposures from using groundwater for drinking water. Another concern was contamination migrating beyond the site boundaries in two groundwater aquifers.