The Schoeller diagram is used to show the relative concentrations of anions and cations typically expressed in milliequivalents per liter. Multiple samples from different wells may be plotted on a single diagram in order to distinguish similar patterns in the ratios of particular anions and cations. Water concentrations are a function of the ground-water geochemistry and the chemical composition of the aquifer rock material. These patterns may be used therefore to distinguish common or disparate source areas of water drawn from multiple wells.
Line Format Tab
The line format tab allow specification of the line style and symbol style for each well. Both scalable and non-scaling line styles may be selected. The scalable line scales allow th number of repetitions of the line pattern to be controlled by setting the Pattern Scale. Higher Pattern Scale properties reduce the number of repetitions that are shown in a line segment of a particular length
Left / Right Axis Tab
The constituents that are plotted versus the left or right axis are specified in the query tab. Hitting the Set default button will result in the data being queried and the minimum, maximum and axis interval being automatically set. The other parameters are self-explanatory.
•Digits Right of Decimal
Non-detects, that are indicated by a ND in the Flag field of the Observations table can be indicated in the Schoeller Diagram by electing to use the non-detect color by setting a check at Use Non-detect Color. The presence of a legend outline and background can also be selected in the Options tab.