The City of Pocatello derives all of its drinking water from relatively shallow groundwater wells (80 to 300 feet deep). Contamination in the form of TCE and to a smaller extent PCE have been found in levels ranging from 1 part per billion (ppb) to over 15 ppb in some of the City's southern wells. The data collected thus far indicates the plume is traveling northward at approximately one mile per year. TCE has been detected at one time or another in 8 of the Citys 24 municipal water wells; of those wells four have been taken offline due to TCE concentrations over the maximum contaminant levels. Two of those wells have since been returned to service due to fluctuating or diminishing TCE levels.
Consequently the City is currently evaluating the most cost-effective solution to this groundwater contamination problem by performing a feasibility study using ozonation technology. The pilot treatment demonstrations will be perfomed at well #14 near the intersection of Cree and Bannock Hwy. The pilot treatment demonstration will be on-going from April 24 through the end of May, 2001.
The City expects to be able to determine from the results of the pilot treatment, if a full-size mobile system is feasible. If it is determined that the full-size system is viable, the hired contractor will design and build the system.
Look at some pictures of the pilot treatment system!