Table 3.

Soil contamination factor (CF) for various sample sources

Spoil type	Potentially toxic elements (mg/kg)
	Cd	As	Pb	Hg	Fe	Zn	Al
FS	0.5	0.9	0.1	1.4c	0.3	0.3	0.1
UrS	47.5a	41.6a	0.7	37.9a	1.6c	3.2b	0.3
OxS	50.2a	38.3a	0.7	22.1a	2.3c	2.5c	1.0c
AvS	13.9a	1.4c	0.2	13.5a	0.7	0.3	0.7

^aVery high contamination

^bConsiderable contamination

^cModerate contamination