Sample								RI	Risk grade
Sample	As	Cr	Cu	Ni	Pb	Zn	Cd	RI	Risk grade
St-1	36.80	2.96	25.14	5.31	5.20	1.01	61.46	137.91	Low
St-2	37.27	1.97	24.88	1.91	5.22	0.90	59.27	131.45	Low
St-3	37.62	1.12	25.85	1.34	5.25	0.89	61.46	133.56	Low
St-4	37.76	1.49	26.68	1.89	5.26	0.95	60.73	134.77	Low
St-5	40.62	1.24	27.61	5.16	5.67	1.22	64.39	145.94	Low
St-6	36.42	1.30	24.94	1.87	5.08	1.008	55.61	126.24	Low
St-7	41.94	1.10	30.75	7.02	5.89	2.096	65.12	153.94	Moderate
St-8	38.48	1.37	25.32	5.31	5.38	0.89	62.19	138.97	Low
St-9	37.32	1.36	24.02	1.85	5.24	0.84	60.73	131.37	Low
Average	38.25	1.55	26.14	3.52	5.32	1.09	61.21	137.13	Low
grade	Low	Low	Low	Low	Low	Low	Moderate