where [C.sub.Cl,sample] is the measured concentration of [Cl.sup.-] in groundwater and [C.sub.Cl,sea] and [C.sub.Cl,f] are the concentrations of [Cl.sup.-] in the standard seawater and the selected freshwater, respectively.
In this study, Group 2 samples had relatively low [Br.sup.-] values, whereas Group 1 had higher values, some (0.83-1.10 meq/L) of which even exceeded the [Br.sup.-] concentrations of standard seawater (0.81 meq/L ) (Figure 5).
In addition, the plots of [[delta].sup.18]O and [[delta].sup.2]H fell along the mixing line between standard seawater and fresh aquifer groundwater.
A well-correlated relationship between [Cl.sup.-] and [Br.sup.-] was observed, and most Cl/Br molar ratios in Group 1 samples were scattered around the dilution line of standard seawater (Figures 6(c) and 6(d)).
A linear relationship between Brand [Cl.sup.-] was observed, with some [Br.sup.-] enriched relative to the expected path for standard seawater and freshwater.
The seawater dilution line between standard seawater and fresh aquifer groundwater is illustrated in red line, and the numbers along with the mixed line stand for the percentage (%) of seawater mixing.