Table 2.

Statistical analysis of groundwater characterization

Landfill H
	Groundwater inflow (background)				Groundwater outflow (polluted)				WHO/PL standards for drinking water quality
Parameter	n = 44				n = 122
	Mean	Min	Max	St. dev.	Mean	Min	Max	St. dev.
pH	6.82	5.70	7.80	0.483	6.97	4.70	7.84	0.541	6.5–8.5
EC	0.5	0.09	1.64	0.429	4.237	0.00	14.40	3.944	−/−
Cd	0.004	0.000	0.063	0.012	0.005	0.000	0.070	0.014	0.003/0.005
Pb	0.024	0.001	0.094	0.031	0.025	0.001	0.150	0.035	0.01/0.025
Zn	0.070	0.000	0.640	0.121	0.149	0.000	8.893	0.851	−/5.0
Cu	0.014	0.001	0.154	0.031	0.038	0.001	0.850	0.085	2.0/2.0
TOC	15.57	0.50	51.10	13.74	118.11	10.92	616.6	126.69	−/−
PAH	2.395	0.000	47.960	8.605	2.166	0.000	96.020	9.606	−/0.1
Cr	0.015	0.000	0.116	0.029	0.019	0.000	0.152	0.036	0.005/0.05
Hg	0.001	0.000	0.010	0.001	0.001	0.000	0.012	0.002	0.006/0.001
Landfill E
Parameter	Groundwater inflow (background)				Groundwater outflow (polluted)				WHO/PL standards for drinking water quality
	n = 36				n = 72
	Mean	Min	Max	St. dev.	Mean	Min	Max	St. dev.
pH	7.24	6.71	7.73	0.221	7.21	6.58	7.77	0.227	−/−
EC	0.688	0.383	1.288	0.140	0.905	0.360	1.715	0.277	−/−
Cd	0.001	0.000	0.001	0.000	0.001	0.000	0.003	0.000	0.003/0.005
Pb	0.004	0.001	0.010	0.002	0.004	0.001	0.021	0.003	0.01/0.025
Zn	0.032	0.001	0.100	0.023	0.028	0.005	0.091	0.018	−/5.0
Cu	0.005	0.001	0.014	0.004	0.004	0.001	0.010	0.004	2.0/2.0
TOC	2.044	0.500	9.860	2.020	2.628	0.001	13.600	2.380	−/−
PAH	0.022	0.003	0.100	0.023	0.093	0.003	2.876	0.413	−/0.1
Cr	0.004	0.000	0.010	0.004	0.004	0.000	0.010	0.004	0.005/0.05
Hg	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.006/0.001
Landfill S
Parameter	Groundwater inflow (background)				Groundwater outflow (polluted)				WHO/PL standards for drinking water quality
	n = 14				n = 28
	Mean	Min	Max	St. dev.	Mean	Min	Max	St. dev.
pH	7.68	7.30	9.26	0.470	7.23	6.86	9.30	0.546	−/−
EC	0.52	0.31	0.61	0.081	1.48	0.00	2.23	0.638	−/−
Cd	0.019	0.000	0.030	0.015	0.019	0.000	0.030	0.014	0.003/0.005
Pb	0.088	0.008	0.120	0.029	0.075	0.007	0.100	0.037	0.01/0.025
Zn	0.145	0.050	0.670	0.183	0.130	0.050	0.560	0.122	−/5.0
Cu	0.038	0.002	0.050	0.017	0.038	0.002	0.060	0.019	2.0/2.0
TOC	2.83	0.00	12.00	3.233	4.97	0.00	13.00	4.116	−/−
PAH	1.19	0.000	8.900	2.557	6.59	0.00	140.00	26.328	−/0.1
Cr	3.574	0.002	10.000	4.970	3.575	0.002	10.000	4.877	0.005/0.05
Hg	0.000	0.000	0.001	0.000	0.000	0.000	0.001	0.000	0.006/0.001

All in mg/l, expect EC in miliS/cm, PAH in μg/l and pH