Tailings from the mill were not discarded near MDW.The groundwater constituents at MDW are hypothesized to have two potential sources.

Many Devils Wash (MDW) is one of two prominent arroyos near the former mill site that has continuous groundwater seeps.

Surface water and groundwater in MDW contain the same constituents as the groundwater located under the processing site.

1) as a ‘dye’ that is delivered to natural water systems from the atmosphere on local to global scales.

If the tritium delivery as a function of time can be reconstructed, this penetration process can be used for quantitative studies of water movement through identification of the bomb peak in certain ground water bodies.

It is independent of the initial tritium concentration of the water sample which is one of the advantages of the method because it eliminates the necessity to establish the exact time- dependent tritium delivery to the aquifer.

A potential problem for the quantitative interpretation of the tritium/He age is typically biased toward the age of the water component with the higher tritium concentration., particularly in the urban areas because of artificial additions to the concentration over almost the entire study area.However, even in these regional circumstances, apparent ages of approximately 16, 36, and not less than 55 years were obtained for three locations on the A–A’ line (recharge area, discharge area, and stagnant zone of groundwater, respectively) from were not detected, implies old groundwater: this is also the area in which denitrification occurs.The results of this research demonstrate that groundwater from several wells to the west of the mill contain age dating tracers that suggest the majority of groundwater was derived from the mill operation era.The complementary results are not evident elsewhere, thus the constituents in MDW may not be related to past milling operations. Tritium is produced naturally in the upper atmosphere by interaction of nitrogen, and, to a lesser extent, oxygen with cosmic rays.