Soil, lead illustrative levels

Table 5.1 presents some illustrative data gathered for California sites for lead content of resuspended materials in the respirable particulate fraction as a function of type of dust source. The levels range from 0.002% to 0.3% with agricultural soils presenting with the lowest lead concentrations, as might be expected. An urban (Fresno, CA) test site showed a level of 0.3%, consistent with the relationship of dust and soil lead content determining resuspended particle lead content. 

Figure 2.4 illustrates the changes in the decision performance goal diagram for the opposite baseline condition (the true mean concentration of lead in soil is below the action level or the null hypothesis H0 i< 100 mg/kg). 

TABLE 6.32 Illustrative Lead Levels ( ig/g, ppm) in Global Soils " ... 

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