ALTADENA, Calif. — A mother in Altadena started her son on chelation therapy to remove lead from his blood. A geochemist will not enter his home without a respirator and a full-body suit. A cinematographer spent thousands to get the lot where his home once stood tested for heavy metals and remediated — work the government cleanup program did not do. Sixteen months after the Eaton Fire, these are the extreme measures Altadena residents are taking to deal with a host of toxic compounds, including