and rainfall. If groundwater levels decline with
time, this is an indication of an imbalance
between recharge and discharge, and a groundwater table below MSL is an indication of
seawater intrusion in the coastal aquifer. The data
recorded on water table fluctuation in the observation wells indicated that the depth to water
table below ground level was increased from
Fig. 14.6 Bivariate diagrams and relation between EC with major ions
Table 14.2 Spearman’s correlation analysis for the groundwater samples
Parameters
pH
EC
TDS
Ca
Mg
Na
K
HCO 3
Cl
SO4
pH
1
EC
−0.336
1
TDS
−0.336
0.999
1
Ca
−0.447
0.505
0.505
1
Mg
−0.441
0.774
0.774
0.7
1
Na
0.027
0.594
0.594
0.206
0.39
1
K
−0.371
0.612
0.612
0.303
0.511
0.413
1
HCO3
0.11
−0.121
−0.121
−0.347
−0.271
0.009
0.018
1
CL
−0.377
0.825
0.825
0.717
0.892
0.629
0.579
−0.332
1
SO4
−0.034
0.602
0.602
0.385
0.539
0.372
0.458
0.077
0.531
1
14 Impacts of Beach Placer Mineral Mining …
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