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Change in the distribution of cadmium concentrations in Pennsylvania biosolids from 1978 to 1997.

Change in the distribution of chromium concentrations in Pennsylvania biosolids from 1978 to 1997.

Change in the distribution of copper concentrations in Pennsylvania biosolids from 1978 to 1997.

Change in the distribution of lead concentrations in Pennsylvania biosolids from 1978 to 1997.

Change in the distribution of nickel concentrations in Pennsylvania biosolids from 1978 to 1997.

Change in the distribution of zinc concentrations in Pennsylvania biosolids from 1978 to 1997.

Change in the distribution of mercury concentrations in Pennsylvania biosolids from 1984 to 1997.

Figure 1. Farms used in the biosolids assessment were located in counties shown in white.

Table 1. Pollutant and ceiling concentrations for land application of sewage sludge.

Table 1. Trace element and PCB concentration limits for land- applied biosolids in Pennsylvania.