Description of available ArcView avl files for Metals concentrations.

The ArcView AVL, which files illustrate concentrations of Ba, Al, Fe, Ti, V, Zr, Ca, and Mn, have ranges and associated dot colors that were determined by making equal numbers of dots in all ranges except the lowest. The lowest range is defined on the low end as zero, indicating samples below the measurable detection limit, and on the high end at an average core background value.

The AVL files that illustrate concentrations of Ag, Cd, Cr, Cu, Hg, Pb, and Zn have ranges defined by environmental Effects Ranges (Long et al., 1998) as well as core background values. The lowest range is defined as below detection limit to core background. The next range is core background to the ER-L value, and the range above is ER-L to the ER-M value. The highest range is bounded by the ER-M and the highest value measured for that element. The map for Ni has ranges that are the same as the above with ER-L and ER-M, however the core background was higher than the ER-L, so the lowest range was defined by creating equal numbers of dots between the lowest and second-to-lowest ranges. [an error occurred while processing this directive]