A gravel city street contains 350 ppm lead from shredded battery cases used for fill 30 years ago. 

Identify all exposure pathways comment on the most significant one. There have been no apparent health problems from the lead contamination, but levels greater than 150 ppm may be a potential health hazard (Use IEUBK to assess the situation and the numbers). 

Should the gravel be replaced or should it be left in place?