A number of contaminants were potentially present in the surface water, including lead, copper, zinc, and iron. Several of these result health effects in human. from a residential showed a level of lead in soil at 815 mg/kg. For reference, the US EPA recommended level is 400 mg/kg. population at risk based entire population of 2,000 people was exposed to the lead in soil which is in a range of 472 to 815 mg/kg.