Table 1.

Measured water chemistry parameters and DCM concentrations within all sampled monitoring wells (n = 10) over the 4 sampling quarters.

	Water chemistry	Q4	Q1	Q2	Q3
		October, 2013 (99)	February, 2014 (100)	May, 2014 (101)	August, 2014 (102)
WW-01I	DCM (μg/L)	1.2	60,000	160,000	XXX
	pH (pH Units)	5.91	5.75	4.44	xxx
	Redox (mV)	21.4	-18.5	21.9	xxx
	DO (mg/L)	0.33	0.64	0.23	xxx
WW-33I	DCM (μg/L)	140,000	98,000	89,000	XXX
	pH (pH Units)	7.09	6.35	5.64	xxx
	Redox (mV)	-84.2	-59.9	-30.6	xxx
	DO (mg/L)	0.02	0.56	0.53	xxx
WW-34I	DCM (μg/L)	XXX	690	46,000	790,000
	pH (pH Units)	xxx	8.3	7.91	7.27
	Redox (mV)	xxx	-150.1	-50.9	-143.9
	DO (mg/L)	xxx	1.5	1.7	0.03 (0.23)
WW-42S	DCM (μg/L)	3.6	XXX	7	2.1
	pH (pH Units)	7.8	xxx	7.17	6.29
	Redox (mV)	3.9	xxx	7	78.8
	DO (mg/L)	0.45	xxx	2.47	0.26 (0.39)
WW-46I	DCM (μg/L)	XXX	0.89	77	5.9
	pH (pH Units)	xxx	7.97	8.11	7.03
	Redox (mV)	xxx	-70	2.4	-34.2
	DO (mg/L)	xxx	0.07	0.23	0.06 (0.15)
WW-47S	DCM (μg/L)	9,800,000	6,500,000	8,800,000	5,500,000
	pH (pH Units)	6.41	6.67	6.34	6.05
	Redox (mV)	88.6	283	47.2	-15.3
	DO (mg/L)	0.84	0.39	1.7	0.07 (0.15)
WW-48I	DCM (μg/L)	XXX	5.2	180	24
	pH (pH Units)	xxx	6.49	6.41	5.96
	Redox (mV)	xxx	137.6	7	43.1
	DO (mg/L)	xxx	0.38	0.41	0.05 (0.32)
WW-51I	DCM (μg/L)	XXX	3.4	XXX	XXX
	pH (pH Units)	xxx	7.39	xxx	xxx
	Redox (mV)	xxx	46.3	xxx	xxx
	DO (mg/L)	xxx	0.96	xxx	xxx
WW-56S	DCM (μg/L)	XXX	6.4	XXX	1.6
	pH (pH Units)	xxx	8.07	xxx	6.95
	Redox (mV)	xxx	139.2	xxx	105.5
	DO (mg/L)	xxx	7.7	xxx	7.55 (8.62)
WW-58D	DCM (μg/L)	XXX	73	XXX	XXX
	pH (pH Units)	xxx	8.4	xxx	xxx
	Redox (mV)	xxx	-113.6	xxx	xxx
	DO (mg/L)	xxx	0.14	xxx	xxx

Samples without data listed did not yield detectable bacterial DNA concentrations for 16S rRNA sequencing.