The impact of urban groundwater upon surface water - eTheses ...

Water Quality Tame Valley 2001 Abstraction
Determinand
Units
DWS
EQS
N samples
Wells
Failed DWS
Shallow
Groundwater
Riverbed
Piezometers
EC uS/cm 1500 14 20 1 58 3 60
Failed EQS
N samples
Failed DWS
Failed EQS
N samples
Failed DWS
Failed EQS
Surface Water
F mg/l 1.5 14 20 2 60 26 67 17
Cl mg/l 250 250 14 20 1 1 60 3 3 67
NO3 mg/l 50 14 7 20 5 60 20 67 17
SO4 mg/l 250 400 14 2 1 20 4 1 60 18 9 67
Ca mg/l 250 14 20 1 54 3 66
K mg/l 12 14 1 20 6 54 38 66 64
Mg mg/l 50 14 20 54 2 66
Na mg/l 200 170 14 20 1 2 54 3 5 66
Mn mg/l 0.05 14 3 20 12 54 49 66 3
Fe mg/l 0.2 1 14 3 2 20 7 54 27 1 66
Ba mg/l 1 14 20 54 66
Al mg/l 0.2 14 20 2 54 11 66
Pb μg/l 10 20-250 14 20 8 47 3 3
Hg μg/l 1 1 14 20 47 3
Cd μg/l 5 5 14 20 1 1 47 3
Cr μg/l 50 50-250 14 2 2 20 47 3
As μg/l 10 50 14 1 20 47 2 3
Cu μg/l 2000 28 14 20 3 47 3 3
Zn μg/l 5000 125-500 14 2 20 47 3
Ni μg/l 50 200 14 1 20 1 47 11 1 3 2
1,1,1-
TCA
μg/l 100 14 20 44 1 45
1,1-DCA μg/l 3 10 14 20 1 44 5 1 3
TCM μg/l 200 12 14 1 20 44 63
cis-1,2-
DCE
μg/l 50 14 1 20 44 3
PCE μg/l 10 10 14 3 3 20 44 64 1 1
TCE μg/l 10 10 14 5 5 20 1 1 44 9 9 64
VC μg/l 0.5 3 1 20 1 11 7 0
EQS = UK Environmental quality standards for sensitive species of fish at hardness >250 mgl-1 as CaCO3.
DWS = UK Drinking Water Standards
Table 7.7 Comparison of data against environmental quality and drinking water standards.
N samples
Failed DWS
Failed EQS