Reduce the risk of lead in the soil by using compost:
"The science behind it is actually quite simple.... In short, any time you mix a phosphorous material -- manure, food scrap compost, mulch, bone meal -- any dangerous lead in the soil attaches itself to that material.The effects of lead are well known. The article also discusses the problems. Basically, lead is a poison that affects brain functioning. In the garden you breath in the dust and the lead gets into your blood. By composting and using raised beds the lead in the soil is essentially rendered harmless.
'The problem with lead is that it can be sitting in the environment indefinitely, but when it hits stomach acid after you ingest some dust, it dissolves,' Basta said. 'When it does, it essentially attaches itself to our bones,' he said.
But by simply mixing compost materials into soil, we force lead to make that attachment before it goes airborne -- rendering it harmless to our bodies if we do end up breathing it in."