Table 1. Physico-chemical parameters of surface water.

Date	Concentration (mg/L)									DOC (mg/L)	O2(mg/L)	Temp (°C)	pH	Conductivity (μS/cm)
	PO4	SO4	NO2	NO3	Cl	Fe	Na	Mg	K
Dec 2005	—a	—	—	—	—	—	—	—	—	32	1.2	—	—	—
May 2006	2.32	214	BDb	0.68	258	0.51	90	15	18	70	—	17.8	7.88	1126
Dec 2006	—	—	—	—	—	—	—	—	—	—	1.9	14.5	7.62	1576
Mar 2007	0.67	103	BD	7.52	95	—	—	—	—	—	3.6	12.9	7.62	1542
May 2007	1.97	58	BD	BD	148	0.58	80.3	14.9	16.2	—	3.7	13.2	7.58	1368
Nov 2007	0.82	101	BD	6.70	79	0.09	44.7	13.7	9.6	—	—	7.5	8.03	791
Oct 2008	—	73	BD	BD	61	0.11	—	—	—	—	5.9	15.7	8.46	952
Feb 2010	—	65	—	13.9	92	0.08	63	11	10	15.85	5.5	11.5	7.32	911
May 2010	—	111	0.56	10.4	104	0.02	81	17	13	19.73	4.2	13.9	7.47	1122
Sep 2010	1.80	102	BD	6.14	53	0.01	71	14	15	13.12	4.4	18.2	7.42	962
Jan 2011	—	—	—	—	—	—	—	—	—	—	6.5	7.4	7.42	1070
May 2011	—	100	—	—	140	0.17	—	—	—	6.55	4.7	18	7.38	1211
Sep 2011	1.10	78	0.15	2.4	79	0.01	75	12	9.7	7.86	5.3	17.1	7.47	777

The dates of sediment core samplings are shown in boldface and the date of WWTP installation (Mar 2007) is shown in bold/italic.

^aNo data.

^bBelow detection limit.