The Influence of Sewage System on the Functioning and Quality of Krakow’s Watercourses

Table 6

Classification of bottom water sediments presented on the basis of geochemistry standards [16].

Metal	Geochemical background	Sediments class/group			Material excavated	Water sediments
		I weak	II poor	III contaminated	Contaminated^*	TEL^**/PEL^***
	mg/kg
Cd	<0.5	1	5	20	7.5	0.676/4.21
Cr	6	20	100	500	200	52.3/160
Ni	5	30	50	100	75	15.9/42.8
Cu	6	20	100	200	150	18.7/108
Pb	15	50	200	500	200	30.2/112
Zn	73	200	500	1000	1000	124/271

Polish environmental standards and sediment quality assessment guidelines (SQAGs) of Florida Department of Environmental Protection (FDEP).
The kinds and concentrations of substances which cause the excavated material to be contaminated [23].
^**Toxic Effect Level, ^***Probable Effect Level [24].