1.5
PEAK
OCT. 22:
1.58
Samples with elevated levels
1.0
0.24
Average:
FEB. 15: 0.31
0.5
0.3
0.0
’11
’12
’13
’14
’15
’16
’17
0.0
0.3
0.5
1.0
1.5
’11
’12
Samples with elevated levels
0.24
Average:
’13
PEAK
OCT. 22:
1.58
’14
’15
’16
’17
FEB. 15: 0.31
SOURCE: Department of Environmental Protection
James Abundis / Globe Staff