## 7 Discussion
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Sampling Locations** & **ZK01** & **ZK02** & **ZK03** & **ZK04** & **ZK05** &
\begin{tabular}{c} **Standard** \\ **Reference Value** \\ \end{tabular} \\ \hline CD (mg/L) & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 \\ \hline Mn (mg/L) & 0.29 & 0.58 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.4 \\ \hline Hg (mg/L) & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ \hline As (mg/L) & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ \hline Cr\({}^{\mu}\) (mg/L) & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 \\ \hline H\({}_{2}\)SiO\({}_{3}\) (mg/L) & 49.12 & 43.38 & 52.47 & 37.96 & 56.27 & \textgreater{}30 \\ \hline Ag (mg/L) & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 & \textless{}0.05 \\ \hline Biochemical Oxygen Demand (BOD) & 1.76 & 1.67 & 1.23 & 0.92 & 1.23 & \textless{}3.0 \\ \hline Total Dissolved Solids (TDS) & 285 & 317 & 570 & 450 & 127 & \textgreater{}1000 \\ \hline Cyanides & Not detected & Not detected & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ \hline Phenols & Not detected & Not detected & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ \hline Anionic synthetic detergents & & & \textless{}0.10 & \textless{}0.10 & \textless{}0.10 & \textless{}0.3 \\ \hline \multirow{4}{*}{Hardness or alkalinity} & Total Hardness & 171 & 191 & 421.19 & 360.44 & 36.63 & \\ \cline{2-6}  & Total Alkalinity & 233 & 228 & 438.51 & 407.28 & 39.95 & \\ \cline{2-6}  & Temporary & 171 & 191 & 421.19 & 360.44 & 36.63 & \\ \cline{2-6}  & Faramenet & & & & & \\ \cline{2-6}  & Hardness & Not detected & Not detected & Not detected & Not detected & \\ \cline{2-6}  & Page Hardness & & & 17.31 & 46.84 & 3.32 & \\ \hline pH & 6.93 & 6.83 & 7.87 & 8.58 & 7.03 & \\ \hline \multirow{4}{*}{Groundwater chemical type} & HCO\({}_{3}\)-CaMg & HCO\({}_{3}\)-CaMg\({}_{3}\)Na & HCO\({}_{3}\)-CaMg & HCO\({}_{3}\)-CaMg & HCO\({}_{3}\)-Na.Ca & \\ \cline{2-6}  & Neutral Fresh & Neutral Fresh & Neutral Fresh & Neutral Weak & Neutral Weak & alkaline \\ \cline{1-1}  & water & water & water & freshwater type & freshwater type \\ \hline Neutral freshwater type & & & National Standard GB8537-2008 for Natural Mineral Drinking Water & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: _Cont._composition at shallower depths. This transition was associated with compressive phenomena and the development of fractures within the underlying sandy stratum. Subsequent pumping tests reaffirmed the variability in water output, with ZK01, ZK02, and ZK05 exhibiting maximum water outputs of approximately 460 tons, 170 tons, and 100 tons per day, respectively. Notably, changes in water output in ZK05 were attributed to the presence of the F2 fault, underscoring the significant influence of fault zones on groundwater dynamics. In summary, the 2D electrical resistivity imaging method, integrated with borehole data and advanced verification techniques, provided a comprehensive understanding of subsurface conditions and groundwater potential within the complex hydrogeological setting of the study area. These findings hold substantial implications for groundwater resource management and exploration, guiding critical decisions in this critical domain.