Average concentrations of elements in San Luis Obispo County, California

Element	Symbol	Mean	Std. dev.	Minimum	Maximum
Aluminum	Al (wt%)	6.475	0.537	3.831	8.692
Arsenic	As (ppm)	5.275	1.837	1.104	14.422
Calcium	Ca (wt%)	2.118	0.929	0.500	11.614
Copper	Cu (ppm)	18.124	8.930	1.084	59.828
Iron	Fe (wt%)	2.780	0.765	0.672	6.398
Mercury	Hg (ppm)	0.078	0.106	0.010	0.862
Magnesium	Mg (wt%)	1.017	0.812	0.159	6.879
Manganese	Mn (ppm)	493.358	198.588	178.360	1550.490
Sodium	Na (wt%)	1.732	0.268	0.606	2.656
Phosphorus	P (wt%)	0.094	0.048	0.027	0.644
Lead	Pb (ppm)	26.137	32.057	7.568	675.726
Selenium	Se (ppm)	0.747	1.004	0.102	8.268
Titanium	Ti (wt%)	0.351	0.104	0.148	1.390
Zinc	Zn (ppm)	61.602	18.575	15.061	181.564