Inquiry Faults Chemical Mixers and City For 'Witch's Brew' in 2002 Chelsea Blast
Federal investigators say commercial tenant and New York City share responsibility for explosion that ripped apart Chelsea loft building last spring, injuring dozens of people; tenant, Kaltech Industries Group, sign-making company, stored and mixed hazardous chemicals in basement without adequate safety training for its workers and also without proper permits, and city monitored chemical inventory poorly; blast reviewed; photo (M)
